title: Phaeobacterium nitratireducens gen. nov., sp. nov., a phototrophic gammaproteobacterium isolated from a mangrove forest sediment sample.
abstract: A novel brown-coloured, Gram-negative-staining, rod-shaped, motile, phototrophic, purple sulfur bacterium, designated strain AK40T, was isolated in pure culture from a sediment sample collected from Coringa mangrove forest, India. Strain AK40T contained bacteriochlorophyll a and carotenoids of the rhodopin series as major photosynthetic pigments. Strain AK40T was able to grow photoheterotrophically and could utilize a number of organic substrates. It was unable to grow photoautotrophically and did not utilize sulfide or thiosulfate as electron donors. Thiamine and riboflavin were required for growth. The dominant fatty acids were C12 : 0, C16 : 0, C18 : 1ω7c and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). The polar lipid profile of strain AK40T was found to contain diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and eight unidentified lipids. Q-10 was the predominant respiratory quinone. The DNA G+C content of strain AK40T was 65.5 mol%. 16S rRNA gene sequence comparisons indicated that the isolate represented a member of the family Chromatiaceae within the class Gammaproteobacteria. 16S rRNA gene sequence analysis indicated that strain AK40T was closely related to Phaeochromatium fluminis, with 95.2% pairwise sequence similarity to the type strain; sequence similarity to strains of other species of the family was 90.8-94.8%. Based on the sequence comparison data, strain AK40T was positioned distinctly outside the group formed by the genera Phaeochromatium, Marichromatium, Halochromatium, Thiohalocapsa, Rhabdochromatium and Thiorhodovibrio. Distinct morphological, physiological and genotypic differences from previously described taxa supported the classification of this isolate as a representative of a novel species in a new genus, for which the name Phaeobacterium nitratireducens gen. nov., sp. nov. is proposed. The type strain of Phaeobacterium nitratireducens is AK40T ( = JCM 19219T = MTCC 11824T).
authors: Microbial Type Culture Collection and Gene Bank, CSIR - Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India.
authors: Nupur
authors: CSIR - National Institute of Oceanography, Regional Centre, 176, Lawsons Bay Colony, Visakhapatnam - 530017, India.
authors: Naga Radha Srinivas
authors: NRS
authors: Tanuku
authors: Nippon Medical School, Department of Biology, , Kosugi-cho, Nakahara, Kawasaki 211-0063, Japan.
authors: Takaichi
authors: T
authors: Shinichi
authors: Microbial Type Culture Collection and Gene Bank, CSIR - Institute of Microbial Technology, Sector 39A, Chandigarh - 160 036, India.
authors: Anil Kumar
authors: AK
authors: Pinnaka
mesh_terms: D015373:Bacterial Typing Techniques; D025541:Bacteriochlorophyll A / Q000737:chemistry; D001482:Base Composition; D002338:Carotenoids / Q000737:chemistry; D002841:Chromatiaceae / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D004269:DNA, Bacterial / Q000235:genetics; D005227:Fatty Acids / Q000737:chemistry; D065928:Forests; D019015:Geologic Sediments / Q000382:microbiology*; D007194:India; D008969:Molecular Sequence Data; D010743:Phospholipids / Q000737:chemistry; D010788:Photosynthesis; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D025541:Bacteriochlorophyll A; D004269:DNA, Bacterial; D005227:Fatty Acids; D010743:Phospholipids; D012336:RNA, Ribosomal, 16S; D002338:Carotenoids