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Int J Syst Evol Microbiol 59 (2009), 948-952; DOI  10.1099/ijs.0.005231-0
© 2009 International Union of Microbiological Societies

Marinactinospora thermotolerans gen. nov., sp. nov., a marine actinomycete isolated from a sediment in the northern South China Sea

Xin-Peng Tian1,2, Shu-Kun Tang1, Jun-De Dong2,3, Yu-Qin Zhang1, Li-Hua Xu1, Si Zhang2,3 and Wen-Jun Li1,2

1 The Key Laboratory for Microbial Resources of the Ministry of Education, P. R. China, and Laboratory for Conservation and Utilization of Bio-resources, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan 650091, PR China
2 Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, PR China
3 Hainan Key Lab of Tropical Marine Biotechnology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Sanya 572000, PR China

Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn
Si Zhang
zhangsi{at}scsio.ac.cn

A novel marine actinomycete, designated SCSIO 00652T, was isolated from a marine sediment collected from the northern South China Sea at a depth of 3865 m. The strain formed branched substrate mycelia and no fragmentation was found. Abundant aerial mycelia differentiated into long spore chains and the spores had a wrinkled surface. Growth occurred on ISP medium 2 with 0–5 % (w/v) NaCl and at 10–55 °C. The whole-cell hydrolysate contained meso-diaminopimelic acid and glucose as the whole-cell sugar. BLAST search results based on an almost-complete 16S rRNA gene sequence showed the novel strain had the highest similarity (96.5 %) with Nocardiopsis trehalosi VKM Ac-942T. The phylogenetic tree of the family Nocardiopsaceae indicated that strain SCSIO 00652T formed a distinct lineage at the deepest branch with a high bootstrap value. Additionally, the profiles of menaquinones, phospholipids and fatty acids showed there were marked differences between strain SCSIO 00652T and the recognized genera of the family Nocardiopsaceae. Based on the polyphasic data, a new genus, Marinactinospora gen. nov., is proposed within the family Nocardiopsaceae with the type species Marinactinospora thermotolerans sp. nov. The type strain of the type species is SCSIO 00652T (=DSM 45154T=CCTCC AA 208041T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain SCSIO 00652T is EU698029.

A supplementary table showing patterns of selected 16S rRNA gene signature nucleotides in the genera of the family Nocardiopsaceae is available with the online version of this paper.






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