
Photo: UiT
Nils P Willassen
- Maharajan, Amudha Deepalakshmi; Hjerde, Erik; Hansen, Hilde; Willassen, Nils P. Quorum Sensing Controls the CRISPR and Type VI Secretion Systems in Aliivibrio wodanis 06/09/139. Frontiers in Veterinary Science 2022. ISSN 2297-1769.s doi: 10.3389/fvets.2022.799414.
- Klemetsen, Terje; Karlsen, Christian; Willassen, Nils Peder. Phylogenetic Revision of the Genus Aliivibrio: Intra- and Inter-Species Variance Among Clusters Suggest a Wider Diversity of Species. (data) (fulltekst) (sammendrag) Frontiers in Microbiology 2021; Volum 12. ISSN 1664-302X.s 1 - 11.s doi: 10.3389/fmicb.2021.626759.
- Maharajan, Amudha Deepalakshmi; Hansen, Hilde; Khider, Miriam; Willassen, Nils Peder. Quorum sensing in Aliivibrio wodanis 06/09/139 and its role in controlling various phenotypic traits. PeerJ 2021; Volum 9. ISSN 2167-8359.s 1 - 27.s doi: 10.7717/peerj.11980.
- Klemetsen, Terje; Willassen, Nils Peder; Karlsen, Christian René. Full‐length 16S rRNA gene classification of Atlantic salmon bacteria and effects of using different 16S variable regions on community structure analysis. MicrobiologyOpen 2019; Volum 8 (10). ISSN 2045-8827.s doi: 10.1002/mbo3.898.
- Khider, Miriam; Hansen, Hilde; Hjerde, Erik; Johansen, Jostein a; Willassen, Nils Peder. Exploring the transcriptome of luxI- and ΔainS mutants and the impact of N-3-oxo-hexanoyl-L- and N-3-hydroxy- decanoyl-L-homoserine lactones on biofilm formation in Aliivibrio salmonicida. PeerJ 2019; Volum 2019. ISSN 2167-8359.s doi: 10.7717/peerj.6845.
- Le Doujet, Typhaine; De Santi, Concetta; Klemetsen, Terje; Hjerde, Erik; Willassen, Nils Peder; Haugen, Peik. Closely-related Photobacterium strains comprise the majority of bacteria in the gut of migrating Atlantic cod (Gadus morhua). Microbiome 2019; Volum 7. ISSN 2049-2618.s doi: 10.1186/s40168-019-0681-y.
- Khider, Miriam; Hjerde, Erik; Hansen, Hilde; Willassen, Nils Peder. Differential expression profiling of ΔlitR and ΔrpoQ mutants reveals insight into QS regulation of motility, adhesion and biofilm formation in Aliivibrio salmonicida. BMC Genomics 2019; Volum 20. ISSN 1471-2164.s 1 - 18.s doi: 10.1186/s12864-019-5594-4.
- Esaiassen, Eirin; Hjerde, Erik; Cavanagh, Jorunn Pauline; Pedersen, Tanja; Andresen, Jannicke Hanne; Rettedal, Siren; Støen, Ragnhild; Nakstad, Britt; Willassen, Nils Peder; Klingenberg, Claus. Effects of Probiotic Supplementation on the Gut Microbiota and Antibiotic Resistome Development in Preterm Infants. Frontiers in pediatrics 2018; Volum 6 (November 2018). ISSN 2296-2360.s doi: 10.3389/fped.2018.00347.
- Khider, Miriam; Willassen, Nils Peder; Hansen, Hilde. The alternative sigma factor RpoQ regulates colony morphology, biofilm formation and motility in the fish pathogen Aliivibrio salmonicida. (fulltekst) BMC Microbiology 2018; Volum 18. ISSN 1471-2180.s doi: 10.1186/s12866-018-1258-9.
- Dang, Nga Phuong; Willassen, Nils Peder; O'Sadnick, Megan Eileen; Petrich, Christian. Effect of Oil Pollution and Ice Formation on Microbial Community of Seawater from Ofotfjorden, Norway. (data) 2018 ISBN 978-0-660-04851-2.s 546 - 558.
- Tekle, Kidane M; Gundersen, Sveinung; Klepper, Kjetil; Bongo, Lars Ailo; Raknes, Inge Alexander; Li, Xiaxi; Zhang, Wei; Andreetta, Christian; Mulugeta, Teshome Dagne; Kalaš, Matúš; Rye, Morten Beck; Hjerde, Erik; Antony Samy, Jeevan Karloss; Fornous, Ghislain; Azab, Abdulrahman; Våge, Dag Inge; Hovig, Eivind; Willassen, Nils Peder; Drabløs, Finn; Nygård, Ståle; Petersen, Kjell; Jonassen, Inge. Norwegian e-Infrastructure for Life Sciences (NeLS). F1000 Research 2018; Volum 7:968. ISSN 2046-1402.s doi: 10.5256/f1000research.16472.r35600.
- Karlsen, Christian; Hjerde, Erik; Klemetsen, Terje; Willassen, Nils Peder. Pan genome and CRISPR analyses of the bacterial fish pathogen Moritella viscosa. BMC Genomics 2017; Volum 18:313. ISSN 1471-2164.s doi: 10.1186/s12864-017-3693-7.
- Santaquiteria, Aintzane; Nielsen, Julius; Klemetsen, Terje; Willassen, Nils Peder; Præbel, Kim. The complete mitochondrial genome of the long-lived Greenland shark (Somniosus microcephalus): characterization and phylogenetic position. Conservation Genetics Resources 2017; Volum 9 (3). ISSN 1877-7252.s 351 - 355.s doi: 10.1007/s12686-016-0676-y.
- ten Hoopen, Petra; Finn, Robert D.; Bongo, Lars Ailo; Corre, Erwan; Fosso, Bruno; Meyer, Folker; Mitchell, Alex; Pelletier, Eric; Pesole, Graziano; Santamaria, Monica; Willassen, Nils Peder; Cochrane, Guy. The metagenomic data life-cycle: standards and best practices.. GigaScience 2017; Volum 6 (8). ISSN 2047-217X.s 1 - 11.s doi: 10.1093/gigascience/gix047.
- Klemetsen, Terje; Raknes, Inge Alexander; Fu, Juan; Agafonov, Aleksander; Veerabadran Balasundaram, Sudhagar; Tartari, Giacomo; Robertsen, Espen Mikal; Willassen, Nils Peder. The MAR databases: development and implementation of databases specific for marine metagenomics.. Nucleic Acids Research (NAR) 2017; Volum 46 (D1). ISSN 0305-1048.s D692 - D699.s doi: 10.1093/nar/gkx1036.
- Robertsen, Espen Mikal; Denise, Hubert; Mitchell, Alex; Finn, Robert D; Bongo, Lars Ailo Aslaksen; Willassen, Nils Peder. ELIXIR pilot action: Marine metagenomics - towards a domain specific set of sustainable services. F1000 2017; Volum 6. ISSN 1759-796X.s doi: 10.12688/f1000research.10443.1.
- De Santi, Concetta; Willassen, Nils Peder; Williamson, Adele Kim. Biochemical characterization of a family 15 carbohydrate esterase from a bacterial marine Arctic metagenome. PLOS ONE 2016; Volum 11: e0159345 (7). ISSN 1932-6203.s 1 - 22.s doi: 10.1371/journal.pone.0159345.
- Dang, Nga Phuong; Landfald, Bjarne; Willassen, Nils Peder. Biological surface-active compounds from marine bacteria. Environmental technology 2016; Volum 37 (9). ISSN 0959-3330.s 1151 - 1158.s doi: 10.1080/09593330.2015.1103784.
- De Santi, Concetta; Altermark, Bjørn; Pierechod, Marcin Miroslaw; Ambrosino, Luca; de Pascale, Donatella; Willassen, Nils Peder. Characterization of a cold-active and salt tolerant esterase identified by functional screening of Arctic metagenomic libraries. BMC Biochemistry 2016; Volum 17. ISSN 1471-2091.s 1 - 13.s doi: 10.1186/s12858-016-0057-x.
- De Santi, Concetta; Leiros, Hanna-Kirsti S.; Di Scala, Alessia; de Pascale, Donatella; Altermark, Bjørn; Willassen, Nils Peder. Biochemical characterization and structural analysis of a new cold-active and salt-tolerant esterase from the marine bacterium Thalassospira sp.. Extremophiles 2016; Volum 20 (3). ISSN 1431-0651.s 323 - 336.s doi: 10.1007/s00792-016-0824-z.
- Hansen, Hilde; Johansen, Jostein a; Leiros, Hanna-Kirsti S.; Purohit, Amit Anand; Willassen, Nils Peder; Bjelland, Ane Mohn; Kellermann, Stefanie J.. The autoinducer synthases LuxI and AinS are responsible for temperature-dependent AHL production in the fish pathogen Aliivibrio salmonicida. BMC Microbiology 2015. ISSN 1471-2180.s doi: 10.1186/s12866-015-0402-z.
- Holm, Kåre Olav; Nilsson, Kristina; Hjerde, Erik; Willassen, Nils Peder; Milton, Debra L. Complete genome sequence of Vibrio anguillarum strain NB10, a virulent isolate from the Gulf of Bothnia. Standards in Genomic Sciences 2015; Volum 10 (60). ISSN 1944-3277.s doi: 10.1186/s40793-015-0060-7.
- Kashulin, Alexander; Sørum, Henning; Hjerde, Erik; Willassen, Nils Peder. IS elements in Aliivibrio salmonicida LFI1238: Occurrence, variability and impact on adaptability. Gene 2015; Volum 554 (1). ISSN 0378-1119.s 40 - 49.s doi: 10.1016/j.gene.2014.10.019.
- Hansen, Hilde; Purohit, Amit Anand; Leiros, Hanna-Kirsti S.; Johansen, Jostein; Kellermann, Stefanie J.; Bjelland, Ane Mohn; Willassen, Nils Peder. The autoinducer synthases LuxI and AinS are responsible for temperature-dependent AHL production in the fish pathogen Aliivibrio salmonicida. BMC Microbiology 2015; Volum 15 (69). ISSN 1471-2180.s doi: 10.1186/s12866-015-0402-z.
- Hjerde, Erik; Karlsen, Christian; Sørum, Henning; Parkhill, Julian; Willassen, Nils Peder; Thomson, Nicholas R.. Co-cultivation and transcriptome sequencing of two co-existing fish pathogens Moritella viscosa and Aliivibrio wodanis. BMC Genomics 2015; Volum 16 (447). ISSN 1471-2164.s 1 - 13.s doi: 10.1186/s12864-015-1669-z.
- De Santi, Concetta; Altermark, Bjørn; de Pascale, Donatella; Willassen, Nils Peder. Bioprospecting around Arctic islands: Marine bacteria as rich source of biocatalysts. Journal of Basic Microbiology 2015; Volum 55. ISSN 0233-111X.s 1 - 16.s doi: 10.1002/jobm.201500505.
- Moe, Elin; Assefa, Netsanet Gizaw; Leiros, Ingar; Torseth, Kathrin; Smalås, Arne O.; Willassen, Nils Peder. Reduced Hydrophobicity of the Minor Groove Intercalation Loop is Critical for Efficient Catalysis by Cold Adapted Uracil-DNA N-Glycosylase from Atlantic Cod. Journal of Thermodynamics & Catalysis 2015; Volum 6 (3). ISSN 2157-7544.s doi: 10.4172/2157-7544.1000155.
- Bjerga, Gro Elin Kjæreng; Hjerde, Erik; De Santi, Concetta; Williamson, Adele Kim; Smalås, Arne O.; Willassen, Nils Peder; Altermark, Bjørn. High quality draft genome sequence of Streptomyces sp. strain AW19M42 isolated from a sea squirt in Northern Norway. Standards in Genomic Sciences 2014; Volum 9 (3). ISSN 1944-3277.s doi: 10.4056/sigs.5038901.
- Assefa, Netsanet Gizaw; Niiranen, Laila; Johnson, Kenneth; Leiros, Hanna-Kirsti S.; Smalås, Arne O.; Willassen, Nils Peder; Moe, Elin. Structural and biophysical analysis of interactions between cod and human uracil-DNA N-glycosylase (UNG) and UNG inhibitor (Ugi). Acta Crystallographica Section D: Biological Crystallography 2014; Volum 70 (8). ISSN 0907-4449.s 2093 - 2100.s doi: 10.1107/S1399004714011699.
- Hansen, Hilde; Bjelland, Ane Mohn; Pain, Maria; Robertsen, Espen Mikal; Willassen, Nils Peder. LitR Is a Repressor of syp Genes and Has a Temperature-Sensitive Regulatory Effect on Biofilm Formation and Colony Morphology in Vibrio (Aliivibrio) salmonicida. Applied and Environmental Microbiology 2014; Volum 80 (17). ISSN 0099-2240.s 5530 - 5541.s doi: 10.1128/AEM.01239-14.
- De Santi, Concetta; Tedesco, P; Ambrosino, L; Altermark, Bjørn; Willassen, Nils Peder; De Pascale, D. A new alkaliphilic cold-active esterase from the psychrophilic marine bacterium Rhodococcus sp.: Functional and structural studies and biotechnological potential. Applied Biochemistry and Biotechnology (ABAB) 2014; Volum 172 (6). ISSN 0273-2289.s 3054 - 3068.s doi: 10.1007/s12010-013-0713-1.
- Pedersen, Edvard; Willassen, Nils Peder; Bongo, Lars Ailo. Transparent Incremental Updates for Genomics Data Analysis Pipelines. Springer 2014 (8374) ISBN 978-3-642-54419-4. ISSN 0302-9743.s 311 - 320.s doi: 10.1007/978-3-642-54420-0_31.
- Strand, Mårten; Carlsson, Marcus; Uvell, Hanna; Islam, Koushikul; Edlund, Karin; Cullman, Inger; Altermark, Bjørn; Mei, Ya-Fang; Elofsson, Mikael; Willassen, Nils Peder; Wadell, Göran; Almqvist, Fredrik. Isolation and Characterization of Anti-Adenoviral Secondary Metabolites from Marine Actinobacteria. Marine Drugs 2014; Volum 12 (2). ISSN 1660-3397.s 799 - 821.s doi: 10.3390/md12020799.
- Ernstsen, Martin; Kjærner-Semb, Erik Nordtorp; Willassen, Nils Peder; Bongo, Lars Ailo. Mario: Interactive Tuning of Biological Analysis Pipelines Using Iterative Processing. Springer 2014; Volum 8805 (Part 1) ISBN 978-3-319-14324-8. ISSN 0302-9743.s 263 - 274.s doi: 10.1007/978-3-319-14325-5_23.
- Purohit, Amit Anand; Johansen, Jostein a; Hansen, Hilde; Leiros, Hanna-Kirsti S.; Kashulin, Alexander; Karlsen, Christian; Smalås, Arne O.; Haugen, Peik; Willassen, Nils Peder. Presence of acyl-homoserine lactones in 57 members of the Vibrionaceae family. Journal of Applied Microbiology 2013; Volum 115 (3). ISSN 1364-5072.s 835 - 847.s doi: 10.1111/jam.12264.
- Hjerde, Erik; Pierechod, Marcin Miroslaw; Williamson, Adele Kim; Bjerga, Gro Elin Kjæreng; Willassen, Nils Peder; Smalås, Arne O.; Altermark, Bjørn. Draft Genome Sequence of the Actinomycete Rhodococcus sp. Strain AW25M09, Isolated from the Hadsel Fjord, Northern Norway. Microbiology Resource Announcements (MRA) 2013; Volum 1 (2). ISSN 2169-8287.s doi: 10.1128/genomeA.00055-13.
- Karlsen, Christian; Sørum, Henning; Willassen, Nils P; Åsbakk, Kjetil. Moritella viscosa bypasses Atlantic salmon epidermal keratocyte clearing activity and might use skin surfaces as a port of infection. Veterinary Microbiology 2012; Volum 154 (3-4). ISSN 0378-1135.s 353 - 362.s doi: 10.1016/j.vetmic.2011.07.024.
- Assefa, Netsanet Gizaw; Niiranen, Laila; Willassen, Nils P; Smalås, Arne O.; Moe, Elin. Thermal unfolding studies of cold adapted uracil-DNA N-glycosylase (UNG) from Atlantic cod (Gadus morhua). A comparative study with human UNG. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology 2012; Volum 161 (1). ISSN 1096-4959.s 60 - 68.s doi: 10.1016/j.cbpb.2011.09.007.
- Bjelland, Ane Mohn; Sørum, Henning; Tegegne, Daget Ayana; Winther-Larsen, Hanne Cecilie; Willassen, Nils Peder; Hansen, Hilde. LitR of Vibrio salmonicida Is a Salinity-Sensitive Quorum-Sensing Regulator of Phenotypes Involved in Host Interactions and Virulence. Infection and Immunity 2012; Volum 80 (5). ISSN 0019-9567.s 1681 - 1689.s doi: 10.1128/IAI.06038-11.
- Hansen, Geir Åsmund; Ahmad, Rafi; Hjerde, erik; Fenton, Christopher Graham; Willassen, Nils Peder; Haugen, Peik. Expression profiling reveals Spot 42 small RNA as a key regulator in the central metabolism of Aliivibrio salmonicida. BMC Genomics 2012; Volum 13. ISSN 1471-2164.s doi: 10.1186/1471-2164-13-37.
- Pedersen, Edvard; Willassen, Nils Peder; Bongo, Lars Ailo. GeStore – Incremental Computation for Metagenomic Pipelines. NIKT: Norsk IKT-konferanse for forskning og utdanning 2012. ISSN 1892-0713.s 251 - 254.
- Bjornsdottir, Bryndis; Hjerde, Erik; Bragason, Birkir Th.; Gudmundsdottir, Thorunn; Willassen, Nils Peder; Gudmundsdottir, Bjarnheidur. Identification of type VI secretion systems in Moritella viscosa. Veterinary Microbiology 2012; Volum 158 (3-4). ISSN 0378-1135.s 436 - 442.s doi: 10.1016/j.vetmic.2012.02.030.
- Lindell, Kristoffer; Fahlgren, Anna; Hjerde, Erik; Willassen, Nils Peder; Fällman, Maria; Milton, Debra L. Lipopolysaccharide O-Antigen Prevents Phagocytosis of Vibrio anguillarum by Rainbow Trout (Oncorhynchus mykiss) Skin Epithelial Cells. PLOS ONE 2012; Volum 7 (5). ISSN 1932-6203.s doi: 10.1371/journal.pone.0037678.
- Kahlke, Tim; Goesmann, Alexander; Hjerde, Erik; Willassen, Nils Peder; Haugen, Peik. Unique core genomes of the bacterial family vibrionaceae: insights into niche adaptation and speciation. BMC Genomics 2012; Volum 13. ISSN 1471-2164.s doi: 10.1186/1471-2164-13-179.
- Ahmad, Rafi; Hansen, Geir Åsmund; Hansen, Hilde; Hjerde, Erik; Pedersen, hege lynum; Paulsen, steinar; Nyrud, May Liss Julianne; Strauss, Anja; Willassen, Nils Peder; Haugen, Peik. Prediction, microarray and northern blot analyses identify new intergenic small RNAs in aliivibrio salmonicida. Journal of Molecular Microbiology and Biotechnology 2012; Volum 22 (6). ISSN 1464-1801.s 352 - 360.s doi: 10.1159/000345769.
- Karlsen, Christian; Espelid, sigrun; Willassen, Nils P; Paulsen, steinar. Identification and cloning of immunogenic Aliivibrio salmonicida Pal-like protein present in profiled outer membrane and secreted subproteome. Diseases of Aquatic Organisms 2011; Volum 93 (3). ISSN 0177-5103.s 215 - 223.s doi: 10.3354/dao02302.
- Weber, Barbara; Lindell, Kristoffer; El Qaidi, Samir; Hjerde, erik; Willassen, Nils P; Milton, Debra L. The phosphotransferase VanU represses expression of four qrr genes antagonizing VanO-mediated quorum-sensing regulation in Vibrio anguillarum. Microbiology (Reading) 2011; Volum 157. ISSN 1350-0872.s 3324 - 3339.s doi: 10.1099/mic.0.051011-0.
- Pedersen, hege lynum; Hjerde, erik; Paulsen, steinar; Hansen, Hilde; Olsen, Lotte; Thode, Sunniva Katharina; Dos Santos, Marcos Tadeu; Paulssen, Ruth H; Willassen, Nils P; Haugen, Peik. Global responses of Aliivibrio salmonicida to hydrogen peroxide as revealed by microarray analysis. Marine Genomics 2010; Volum 3. ISSN 1874-7787.s 193 - 200.s doi: 10.1016/j.margen.2010.10.002.
- Pedersen, hege lynum; Ahmad, Rafi; Riise, EK; Leiros, Hanna-Kirsti S.; Hauglid, Stefan; Espelid, S; Brandsdal, Bjørn Olav; Leiros, Ingar; Willassen, Nils P; Haugen, Peik. Experimental and computational characterization of the ferric uptake regulator from Aliivibrio salmonicida (Vibrio salmonicida). Journal of Microbiology 2010; Volum 48 (2). ISSN 1225-8873.s 174 - 183.s doi: 10.1007/s12275-010-9199-5.
- Ræder, Inger Lin Uttakleiv; Moe, Elin; Willassen, Nils Peder; Smalås, Arne Oskar; Leiros, Ingar. Structure of uracil-DNA N-glycosylase (UNG) from Vibrio cholerae: mapping temperature adaptation through structural and mutational analysis. Acta Crystallographica. Section F : Structural Biology and Crystallization Communications 2010; Volum 66. ISSN 1744-3091.s 130 - 136.s doi: 10.1107/S1744309109052063.
- Thorvaldsen, Steinar; Flå, Tor; Willassen, Nils P. DeltaProt: a software toolbox for comparative genomics. BMC Bioinformatics 2010; Volum 11. ISSN 1471-2105.s doi: 10.1186/1471-2105-11-573.
- Pedersen, hege lynum; Willassen, Nils Peder; Leiros, Ingar. The first structure of a cold-adapted superoxide dismutase (SOD): biochemical and structural characterization of iron SOD from Aliivibrio salmonicida. Acta Crystallographica. Section F : Structural Biology and Crystallization Communications 2009; Volum 65. ISSN 1744-3091.s 84 - 92.s doi: 10.1107/S1744309109001110.
- Ahmad, Rafi; Hjerde, erik; Hansen, Geir Åsmund; Haugen, Peik; Willassen, Nils Peder. Prediction and Experimental Testing of Ferric Uptake Regulator Regulons in Vibrios. Journal of Molecular Microbiology and Biotechnology 2009; Volum 16 (3-4). ISSN 1464-1801.s 159 - 168.s doi: 10.1159/000128322.
- Ahmad, Rafi; Brandsdal, Bjørn Olav; Michaud-Soret, Isabelle; Willassen, Nils Peder. Ferric uptake regulator protein: Binding free energy calculations and per-residue free energy decomposition. Proteins: Structure, Function, and Bioinformatics 2009; Volum 75 (2). ISSN 0887-3585.s 373 - 386.s doi: 10.1002/prot.22247.
- Karlsen, Christian; Paulsen, Steinar Martin; Tunsjø, Hege Smith; Krinner, Simone; Sørum, Henning; Haugen, Peik; Willassen, Nils Peder. Motility and flagellin gene expression in the fish pathogen Vibrio salmonicida: Effects of salinity and temperature. Microbial Pathogenesis 2008; Volum 45. ISSN 0882-4010.s 258 - 264.
- Ahmad, Rafi; Hjerde, erik; Hansen, Geir Åsmund; Haugen, Peik; Willassen, Nils Peder. Prediction and Experimental Testing of Ferric Uptake Regulator Regulons in Vibrios. Journal of Molecular Microbiology and Biotechnology 2008. ISSN 1464-1801.s doi: 10.1159/000128322.
- Karlsen, Christian; Paulsen, steinar; Tunsjø, HS; Krinner, Simone; Sørum, Henning; Haugen, Peik; Willassen, Nils Peder. Motility and flagellin gene expression in the fish pathogen Vibrio salmonicida: effects of salinity and temperature. Microbial Pathogenesis 2008; Volum 45 (4). ISSN 0882-4010.s 258 - 264.s doi: 10.1016/j.micpath.2008.06.002.
- Hjerde, erik; Lorentzen, marit sjo; Holden, MT; Seeger, K; Paulsen, steinar; Bason, N; Churcher, C; Harris, D; Norbertczak, H; Quail, MA; Sanders, S; Thurston, S; Parkhill, J; Willassen, Nils Peder; Thomson, NR. The Genome Sequence Of The Fish Pathogen Aliivibrio salmonicida Strain LFI1238 shows extensive evidence of gene decay. BMC Genomics 2008; Volum 9. ISSN 1471-2164.s 616 - .s doi: 10.1186/1471-2164-9-616.
- Ahmad, Rafi; Brandsdal, Bjørn Olav; Michaud-Soret, Isabelle; Willassen, Nils Peder. Ferric uptake regulator protein: Binding free energy calculations and per-residue free energy decomposition. Proteins: Structure, Function, and Bioinformatics 2008. ISSN 0887-3585.s doi: 10.1002/prot.22247.
- Altermark, Bjørn; Helland, Ronny; Moe, Elin; Willassen, Nils Peder; Smalås, Arne Oskar. Structural adaptation of endonuclease I from the cold-adapted and halophilic bacterium Vibrio salmonicida. Acta Crystallographica Section D: Biological Crystallography 2008; Volum 64. ISSN 0907-4449.s 368 - 376.s doi: 10.1107/S0907444908000097.
- Ræder, Inger Lin Uttakleiv; Leiros, Ingar; Willassen, Nils Peder; Smalås, Arne Oskar; Moe, Elin. Uracil-DNA N-glycosylase (UNG) from the marine, psychrophilic bacterium Vibrio salmonicida shows cold adapted features A comparative analysis to Vibrio cholerae uracil-DNA N-glycosylase. Enzyme and Microbial Technology 2008; Volum 42 (7). ISSN 0141-0229.s 594 - 600.s doi: 10.1016/j.enzmictec.2008.02.005.
- Altermark, Bjørn; Helland, Ronny; Moe, Elin; Willassen, Nils Peder; Smalås, Arne Oskar. Environmental adaptation of endonuclease I from Vibrio salmonicida. Acta Crystallographica Section D: Biological Crystallography 2008; Volum 64. ISSN 0907-4449.s 368 - 376.
- Niiranen, Laila Mirja; Altermark, Bjørn; Brandsdal, Bjørn Olav; Leiros, Hanna-Kirsti S.; Helland, Ronny; Smalås, Arne Oskar; Willassen, Nils Peder. Effects of salt on the kinetics and thermodynamic stability of endonuclease I from Vibrio salmonicida and Vibrio cholerae. The FEBS Journal 2008; Volum 275. ISSN 1742-464X.s 1593 - 1605.s doi: 10.1111/j.1742-4658.2008.06317.x.
- Altermark, Bjørn; Niiranen, Laila Mirja; Willassen, Nils Peder; Smalås, Arne Oskar; Moe, Elin. Comparative studies of endonuclease I from cold-adapted Vibrio salmonicida and mesophilic Vibrio cholerae. The FEBS Journal 2007; Volum 274. ISSN 1742-464X.s doi: 10.1111/j.1742-4658.2006.05580.x.
- Niiranen, Laila Mirja; Espelid, Sigrun; Karlsen, Christian; Mustonen, M; Paulsen, Steinar; Heikinheimo, Pirkko a; Willassen, Nils Peder. Comparative expression study to increase the solubility of cold adapted Vibrio proteins in Escherichia coli. Protein Expression and Purification 2007; Volum 52. ISSN 1046-5928.s 210 - 218.
- Sælensminde, Gisle; Saelensminde, G; Halskau, Øyvind; Halskau, O; Helland, Ronny; Willassen, Nils Peder; Jonassen, I. Structure-dependent relationships between growth temperature of prokaryotes and the amino acid frequency in their proteins. Extremophiles 2007; Volum 11. ISSN 1431-0651.s 585 - 596.s doi: 10.1007/s00792-007-0072-3.
- Thorvaldsen, Steinar; Hjerde, Erik; Fenton, Christopher Graham; Willassen, Nils Peder. Molecular characterization of cold adaptation based on ortholog protein sequences from Vibrionaceae species. Extremophiles 2007; Volum 11 (5). ISSN 1431-0651.s 719 - 732.s doi: 10.1007/s00792-007-0093-y.
- Altermark, Bjørn; Thorvaldsen, Steinar; Moe, Elin; Smalås, Arne Oskar; Willassen, Nils Peder. Sequence comparison and environmental adaptation of a bacterial endonuclease. Computational biology and chemistry 2007; Volum 31 (3). ISSN 1476-9271.s 163 - 172.s doi: 10.1016/j.compbiolchem.2007.03.003.
- Riise, Ellen Kristin; Lorentzen, marit sjo; Helland, Ronny; Smalås, Arne Oskar; Leiros, Hanna-Kirsti S.; Willassen, Nils Peder. The first structure of a cold-active catalase from Vibrio salmonicida at 1.96 angstrom reveals structural aspects of cold adaptation. Acta Crystallographica Section D: Biological Crystallography 2007; Volum 63. ISSN 0907-4449.s 135 - 148.s doi: 10.1107/S0907444906043812.
- Ræder, Inger Liv Uttakleiv; Paulsen, Steinar; Smalås, Arne Oskar; Willassen, Nils Peder. Effect of fish skin mucus on the soluble proteome of Vibrio salmonicida analysed by 2-D gel electrophoresis and tandem mass spectrometry. Microbial Pathogenesis 2007; Volum 42. ISSN 0882-4010.s 36 - 45.s doi: 10.1016/j.micpath.2006.10.003.
- Johansen, R.; Nesse, Live L.; Gram, Lone; Willassen, Nils Peder; Sørum, Henning. Quorum sensing inhibitorer åpner for muligheter til å bekjempe sykdommer også i akvakultur. Norsk Veterinærtidsskrift 2006; Volum 118 (7). ISSN 0332-5741.s 460 - 464.
- Niiranen, Laila Mirja; Espelid, Sigrun; Karlsen, Christian; Mustonen, Milla; Paulsen, steinar; Heikinheimo, Pirkko; Willassen, Nils Peder. Comparative expression study to increase the solubility of cold adapted Vibrio proteins in Escherichia coli. Protein Expression and Purification 2006. ISSN 1046-5928.
- Altermark, Bjørn; Smalås, Arne Oskar; Willassen, Nils Peder; Helland, Ronny. The structure of Vibrio cholerae extracellular endonuclease I reveals the presence of a buried chloride ion. Acta Crystallographica Section D: Biological Crystallography 2006; Volum 62. ISSN 0907-4449.s 1387 - 1391.
- Lorentzen, Marit Sjo; Moe, Elin; Jouve, HM; Willassen, Nils Peder. Cold adapted features of Vibrio salmonicida catalase: characterisation and comparison to the mesophilic counterpart from Proteus mirabilis. Extremophiles 2006; Volum 10 (5). ISSN 1431-0651.s 427 - 440.
- Riise, Ellen Kristin; Lorentzen, Marit Sjo; Helland, Ronny; Willassen, Nils P. Crystallization and preliminary X-ray diffraction analysis of a cold-adapted catalase from Vibrio salmonicida. Acta Crystallographica. Section F : Structural Biology and Crystallization Communications 2006; Volum 62 (1). ISSN 1744-3091.
- Adekoya, Olayiwola; Helland, Ronny; Willassen, Nils P; Sylte, Ingebrigt. Comparative sequence and structure analysis reveal features of cold adaptation of an enzyme in the thermolysin family. Proteins: Structure, Function, and Bioinformatics 2006; Volum 62. ISSN 0887-3585.
- Helland, Ronny; Larsen, Atle Noralf; Smalås, Arne Oskar; Willassen, Nils Peder. The 1.8 angstrom crystal structure of a proteinase K-like enzyme from a psychrotroph Serratia species. The FEBS Journal 2006; Volum 273. ISSN 1742-464X.
- Larsen, Atle Noralf; Moe, Elin; Helland, Ronny; Gjellesvik, Dag Rune; Willassen, Nils Peder. Characterization of a recombinantly expressed proteinase K-like enzyme from a psychrotrophic Serratia sp. The FEBS Journal 2006; Volum 273 (1). ISSN 1742-464X.s 47 - 60.
- Adekoya, Olayiwola; Willassen, Nils Peder; Sylte, Ingebrigt. Molecular insight into pseudolysin inhibition using the MM-PBSA and LIE methods. Journal of Structural Biology 2006; Volum 153. ISSN 1047-8477.s 129 - 144.
- Sørum, Henning; Willassen, Nils Peder; Johansen, Renate. Quorum sensing inhibitorer åpner for muligheter til å bekjempe sykdommer også i akvakultur. Norsk Veterinærtidsskrift 2006; Volum 118 (7). ISSN 0332-5741.s 458 - 461.
- Adekoya, Olayiwola Adedotun; Willassen, Nils Peder; Sylte, Ingebrigt. The protein-protein interactions between SMPI and thermolysin studied by molecular dynamics and MM/PBSA calculations. Journal of Biomolecular Structure and Dynamics 2005; Volum 22 (5). ISSN 0739-1102.s 521 - 532.
- Thorvaldsen, Steinar; Flå, Tor; Willassen, Nils Peder. Extracting Molecular Diversity between Populations through Sequence Alignments. (fulltekst) Lecture Notes in Computer Science (LNCS) 2005; Volum 3745. ISSN 0302-9743.s 317 - 328.s doi: 10.1007/11573067_32.
- Moe, Elin; Leiros, Ingar; Riise, Ellen Kristin; Olufsen, Magne; Lanes, Olav; Smalås, Arne Oskar; Willassen, Nils Peder. Optimisation of the surface electrostatics as a strategy for cold adaptation of uracil-DNA N-glycosylase (UNG) from Atlantic cod (Gadus morhua). Journal of Molecular Biology (JMB) 2004; Volum 343 (5). ISSN 0022-2836.s 1221 - 1230.
- Leiros, Hanna-Kirsti S.; Leiros, Hanna Kirsti Schrøder; Brandsdal, Bjørn Olav; Andersen, Ole Andreas; Os, vibeke; Leiros, Ingar; Leiros, Ingar; Helland, Ronny; Otlewski, J.; Otlewski, Jacek; Willassen, Nils Peder; Smalås, Arne Oskar. Trypsin specificity as elucidated by LIE calculations, X-ray structures, and association constant measurements. Protein Science 2004; Volum 13. ISSN 0961-8368.s 1056 - 1070.
- Moe, Elin; Leiros, Ingar; Riise, Ellen Kristin; Olufsen, Magne; Lanes, Olav; Smalås, Arne Oskar; Willassen, Nils Peder. Optimisation of the surface electrostatics as a strategy for cold adaptation of uracil-DNA N-glycosylase (UNG) from Atlantic cod (Gadus morhua). Journal of Molecular Biology (JMB) 2004; Volum 343. ISSN 0022-2836.s 1221 - 1230.
- Leiros, Ingar; Moe, Elin; Lanes, Olav; Smalås, Arne Oskar; Willassen, Nils Peder. The crystal structure of uracil-DNA-glycosylase from Atlantic cod (Gadus morhua) reveals cold-adaptation fetures. Acta Crystallographica Section D: Biological Crystallography 2003; Volum 59. ISSN 0907-4449.s 1357 - 1365.
- Leiros, Ingar; Moe, Elin; Lanes, Olav; Smalås, Arne Oskar; Willassen, Nils Peder. The crystal structure of uracil-DNA-glycosylase from Atlantic cod (Gadus morhua) reveals cold-adaptation fetures. Acta Crystallographica Section D: Biological Crystallography 2003; Volum 59. ISSN 0907-4449.s 1357 - 1365.
- Lanes, Olav; Leiros, Ingar; Smalås, Arne Oskar; Willassen, Nils Peder. Identification, cloning, and expression of uracil-DNA glycosylase from Atlantic cod (gadus morhua): charcterization and homology modeling of the cold-active catalytic domain. Extremophiles 2002; Volum 6. ISSN 1431-0651.s 73 - 86.
- Leiros, Ingar; Lanes, Olav; Sundheim, Ottar; Helland, Ronny; Smalås, Arne Oskar; Willassen, Nils Peder. Crystallization and preliminary X-ray diffraction analysis of a cold-adapted uracil-DNA glycosylase from Atlantic cod (Gadus morhua). Acta Crystallographica Section D: Biological Crystallography 2001; Volum 57. ISSN 0907-4449.s 1706 - 1708.
- Leiros, Ingar; Lanes, Olav; Sundheim, Ottar; Helland, Ronny; Smalås, Arne O; Willassen, Nils P. Crystallization and preliminary X-ray diffraction analysis of a cold-adapted uracil-DNA glycosylase from Atlantic cod (Gadus morhua). Acta Crystallographica Section D: Biological Crystallography 2001; Volum 57 (11). ISSN 0907-4449.s 1706 - 1708.s doi: 10.1107/S0907444901013427.
- Smalås, Arne Oskar; Leiros, H. -K. S.; Os, V.; Willassen, Nils Peder. Cold adapted enzymes. Biotechnology Annual Review 2000; Volum 6. ISSN 1387-2656.s 1 - 57.
- Elde, Morten; Willassen, Nils Peder; Johansen, Steinar. Functional characteriztion of isoschizomeric His-Cys box homing endonucleases from Naegleria. European Journal of Biochemistry (EJB) 2000; Volum 267. ISSN 0014-2956.s 7257 - 7266.
- Smalås, Arne Oskar; Leiros, Hanna-Kirsti S.; Os, V.; Willassen, Nils Peder. Cold adapted Enzymes. Biotechnology Annual Review 2000; Volum 6. ISSN 1387-2656.s 1 - 57.
- Leiros, H. -K. S.; Willassen, Nils Peder; Smalås, Arne Oskar. Structural comparison of psychrophilic and mesophilic trypsins: elucidating the molecular basis of cold-adaptation. European Journal of Biochemistry (EJB) 2000; Volum 267 (4). ISSN 0014-2956.s 1039 - 1049.
- Johnsen, Helge K.; Tveiten, Helge; Willassen, Nils Peder; Arnesen, Arne Mikal. Arctic charr (Salvelinus alpinus) vitellogenin: development and validation of an enzyme-linked immunosorbent assay (ELISA).. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology 1999; Volum 124. ISSN 1096-4959.s 355 - 362.
- Elde, Morten; Haugen, Peik; Willassen, Nils Peder; Johansen, Steinar. I-Nja I, a nuclear intron-encoded homing endonuclease from Naegleria, generates a pentanucleotide 3' cleavage-overhang within a 19 base pair partially symmetric DNA recognition site. European Journal of Biochemistry (EJB) 1999; Volum 259. ISSN 0014-2956.s 281 - 288.
- Leiros, Hanna-Kirsti S.; Willassen, Nils Peder; Smalås, Arne Oskar. Structural comparison of psychrophilic and mesophilic trypsins. Elucidating the molecular basis of cold-adaptation. European Journal of Biochemistry (EJB) 1999; Volum 267. ISSN 0014-2956.s 1039 - 1049.
- Leiros, Hanna-Kirsti S.; Willassen, Nils Peder; Smalås, Arne Oskar. Residue determinants and sequence analysis of cold-adapted trypsins. Extremophiles 1999; Volum 3. ISSN 1431-0651.s 205 - 219.
- Leiros, H. -K. S.; Willassen, Nils Peder; Smalås, Arne Oskar. Residue determinants and sequence analysis of cold-adapted trypsins. Extremophiles 1999; Volum 3. ISSN 1431-0651.s 205 - 219.
- Helland, Ronny; Berglund, Gunnar Inge; Otlewski, Jacek; Apostoluk, Wlodek; Andersen, Ole Andreas; Willassen, Nils Peder; Smalås, Arne Oskar. High-resolution structures of three new trypsin-squash-inhibitor complexes: a detailed comparison with other trypsins and their complexes. Acta Crystallographica Section D: Biological Crystallography 1999; Volum 55. ISSN 0907-4449.s 139 - 148.
- Schrøder, Hanna-Kirsti; Willassen, Nils Peder; Smalås, Arne Oskar. Structure of a Non-Psychrophilic Trypsin From a Cold-Adapted Fish Species. Acta Crystallographica Section D: Biological Crystallography 1998; Volum 54. ISSN 0907-4449.s 780 - 798.
- Helland, Ronny; Leiros, Ingar; Berglund, Gunnar Inge; Willassen, Nils Peder; Smalås, Arne Oskar. The crystal structure of anionic salmon trypsin in complex with bovine pancreatic trypsin inhibitor. European Journal of Biochemistry (EJB) 1998; Volum 256 (2). ISSN 0014-2956.s 317 - 324.
- Berglund, G. I.; Outzen, H.; Smalås, Arne Oskar; Willassen, Nils Peder. Purification and Characterization of Pancreatic Elastase from the North Atlantic Salmon (Salmo salar). Molecular Marine Biology and Biotechnology 1998; Volum 7. ISSN 1053-6426.s 105 - 114.
- Schrøder, H. -K.; Willassen, Nils Peder; Smalås, Arne Oskar. Structure of a Non-Psychrophilic Trypsin from a Cold-Adapted Fish Species. Acta Crystallographica Section D: Biological Crystallography 1998; Volum 54. ISSN 0907-4449.s 780 - 798.
- Outzen, heidi; Berglund, Gunnar; Smalås, Arne Oskar; Willassen, Nils Peder. Temperature and pH Sensitivity of trypsins from Atlantic Salmon (Salmo salar) in Comparison with Bovine and Porcine Trypsin. Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology 1996; Volum 115. ISSN 1096-4959.s 33 - 45.
- Berglund, Gunnar; Smalås, Arne Oskar; Hordvik, Asbjørn; Willassen, Nils Peder. The crystal structure of salmon pancreatic elastase at 1.6 Å resolution. Acta Crystallographica Section D: Biological Crystallography 1995; Volum 51. ISSN 0907-4449.s 925 - 937.