title: Actinomadura sediminis sp. nov., a marine actinomycete isolated from mangrove sediment.
abstract: In this study, the taxonomic position of an actinobacterium, strain YIM M 10931(T), which was isolated from a mangrove sediment sample collected in Dugong Creek, Little Andaman, India, was determined by a polyphasic approach. This gram-positive, aerobic strain produced branched substrate mycelium and aerial hyphae, which differentiated into short, hooked or spiral spore chains. The organism contained meso-diaminopimelic acid as the diagnostic diamino acid in the cell-wall peptidoglycan. The whole cell sugars consisted of mannose, ribose, glucose, galactose and madurose. The cellular fatty acid profile mainly consisted of iso-C(16 : 0), 10-methyl C(18 : 0) and C(16 : 0). The quinone system was predominantly composed of MK-9(H(8)) (45.5 %) and MK-9(H(6)) (39 %). The phospholipids detected were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol mannoside, phosphatidylinositol and two unknown phospholipids. The organism showed a combination of morphological and chemotaxonomic properties typical of members of the genus Actinomadura. Moreover, phylogenetic analysis based on a 16S rRNA gene sequence generated from the strain identified its closest relatives as Actinomadura cremea DSM 43676(T) (98.4 % sequence similarity), Actinomadura rifamycini DSM 43936(T) (97.4 %) and Actinomadura apis IM17-1(T) (96.9 %). It was obvious from the resulting phylogenetic trees that strain YIM M 10931(T) belongs to a distinct subclade within the evolutionary radiation of the genus Actinomadura. DNA-DNA hybridizations of strain YIM M 10931(T) with A. cremea DSM 43676(T) and A. rifamycini DSM 43936(T) were performed and further confirmed that the isolate represents a separate genomic species. Based on the phenotypic and genotypic characteristics presented, it is proposed that strain YIM M 10931(T) represents a novel species within the genus Actinomadura, for which the name Actinomadura sediminis sp. nov. is proposed; the type strain is YIM M 10931(T) ( = CCTCC AA 2010009(T) = DSM 45500(T)).
authors.affiliation: Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: He
authors.affiliation: Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Centre of Advanced Study in Marine Biology, Faculty of Marine Science, Annamalai University, Parangipettai 608 502, Tamilnadu, India.
authors.forename: Maloy Kumar
authors.initials: MK
authors.lastname: Sahu
authors.affiliation: CAS Key Laboratory of Marine Bio-Resources Sustainable Utilization, RNAM Center for Marine Microbiology, CAS Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China.
authors.forename: Xin-Peng
authors.initials: XP
authors.lastname: Tian
authors.affiliation: College of Life Science, Henan Normal University, Xinxiang 453007, PR China.
authors.forename: Guo-Xing
authors.initials: GX
authors.lastname: Nie
authors.affiliation: State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing 100094, PR China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Xie
authors.affiliation: CAS Key Laboratory of Marine Bio-Resources Sustainable Utilization, RNAM Center for Marine Microbiology, CAS Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China.
authors.forename: Si
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Centre of Advanced Study in Marine Biology, Faculty of Marine Science, Annamalai University, Parangipettai 608 502, Tamilnadu, India.
authors.forename: Kannan
authors.initials: K
authors.lastname: Sivakumar
authors.affiliation: Key Laboratory of Biogeography and Bioresource in Arid Land, Xingjiang Institute of Ecology and Geography, Chinese Academy Of Sciences, Ürmqi 830011, PR China.|Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China.
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Li
mesh_terms: D000192:Actinomycetales / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D000332:Aerobiosis; D015373:Bacterial Typing Techniques; D002241:Carbohydrates / Q000032:analysis; D016000:Cluster Analysis; D003600:Cytosol / Q000737:chemistry; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D003960:Diaminopimelic Acid / Q000032:analysis; D004783:Environmental Microbiology; D005227:Fatty Acids / Q000032:analysis; D007194:India; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010457:Peptidoglycan / Q000737:chemistry; D010743:Phospholipids / Q000032:analysis; D010802:Phylogeny; D011809:Quinones / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013171:Spores, Bacterial / Q000166:cytology
chemical_list: D002241:Carbohydrates; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D010457:Peptidoglycan; D010743:Phospholipids; D011809:Quinones; D012336:RNA, Ribosomal, 16S; D003960:Diaminopimelic Acid