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Abstract
A novel Gram-negative, rod-shaped, non-motile, psychrophilic bacterium, designated strain E4-9aT, was isolated from a marine sediment sample collected at a depth of 276 m from Kongsfjorden, Svalbard, in the Arctic Ocean. The colony colour was golden yellow. Strain E4-9aT was positive for amylase activity at 5 °C. The predominant fatty acids were iso-C15 : 1 G (21.8 %), anteiso-C15 : 0 (19.1 %), anteiso-C15 : 1 A (18.6 %), iso-C15 : 0 (13.8 %) and iso-C16 : 1 H (6.4 %). Strain E4-9aT contained MK-6 as the major respiratory quinone. The polar lipids consisted of phosphatidylethanolamine, three unidentified aminolipids (AL1, AL4 and AL5), an unidentified phospholipid and four unidentified lipids (L1, L4 to L6). Based on 16S rRNA gene sequence similarity, it was ascertained that the closest related species to E4-9aT were Lacinutrix copepodicola , L. algicola and L. mariniflava , with sequence similarity to the respective type strains of 98.5, 96.5 and 95.8 %. Phylogenetic analysis showed that strain E4-9aT clustered with the type strain of L. copepodicola and with those of L. algicola and L. mariniflava at distances of 1.5 and 4.8 % (98.5 and 95.2 % similarity), respectively. However, DNA–DNA hybridization with L. copepodicola DJ3T showed 59 % relatedness with respect to strain E4-9aT. The DNA G+C content of strain E4-9aT was 29 mol%. Based on the results of DNA–DNA hybridization and phenotypic data, it appears that strain E4-9aT represents a novel species of the genus Lacinutrix , for which the name Lacinutrix himadriensis sp. nov. is proposed. The type strain is E4-9aT ( = CIP 110310T = KCTC 23612T).
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Funding
- National Centre for Antarctic and Ocean Research, Goa
- CSIR Network Project on Exploitation of India’s rich microbial diversity (Award NWP0006)