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Title: Genetic and Structural Diversity of Prokaryotic Ice-Binding Proteins from the Central Arctic Ocean.

Journal Article · · Genes
 [1];  [2];  [3];  [4];  [4];  [1];  [1]
  1. Univ. of East Anglia, Norwich (United Kingdom)
  2. Univ. of East Anglia, Norwich (United Kingdom); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Alfred Wegener Inst., Bremerhaven (Germany)

Ice-binding proteins (IBPs) are a group of ecologically and biotechnologically relevant enzymes produced by psychrophilic organisms. Although putative IBPs containing the domain of unknown function (DUF) 3494 have been identified in many taxa of polar microbes, our knowledge of their genetic and structural diversity in natural microbial communities is limited. Here, we used samples from sea ice and sea water collected in the central Arctic Ocean as part of the MOSAiC expedition for metagenome sequencing and the subsequent analyses of metagenome-assembled genomes (MAGs). By linking structurally diverse IBPs to particular environments and potential functions, we reveal that IBP sequences are enriched in interior ice, have diverse genomic contexts and cluster taxonomically. Their diverse protein structures may be a consequence of domain shuffling, leading to variable combinations of protein domains in IBPs and probably reflecting the functional versatility required to thrive in the extreme and variable environment of the central Arctic Ocean.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); Natural Environment Research Council (NERC); United Kingdom Research and Innovation (UKRI); Research Council of Norway
Grant/Contract Number:
AC02-05CH11231; OPP-1735862; NE/S007334/1; BB/T008717/1; 280292
OSTI ID:
1970326
Journal Information:
Genes, Vol. 14, Issue 2; ISSN 2073-4425
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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