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Citricoccus alkalitolerans sp. nov., a novel actinobacterium isolated from a desert soil in Egypt

¹ The Key Laboratory for Microbial Resources of Ministry of Education, P. R. China, Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, P. R. China
² Korea Research Institute of Bioscience and Biotechnology, 52 Oeundong, Yusong, Daejeon 305-333, Republic of Korea
³ Department of Chemistry, Chuxiong Normal College, Chuxiong, Yunnan, 675000, P. R. China

Correspondence
Chang-Jin Kim
changjin{at}kribb.re.kr or
wjli{at}ynu.edu.cn

An actinobacterium, strain YIM 70010^T, which was isolated from a desert soil sample collected in Egypt, was subjected to a polyphasic taxonomy study. The organism was alkalitolerant and its optimum growth occurred at pH 8·0–9·0. The isolate contained chemotaxonomic markers that were characteristic of the genus Citricoccus, i.e. the peptidoglycan type Lys–Gly–Glu (variation A4), the predominant menaquinone MK-9(H₂) and a polar lipid profile consisting of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unknown glycolipids. The major fatty acids were anteiso-C_{15 : 0} and iso-C_{15 : 0}. The G+C content of the genomic DNA was 63·8 mol%. Strain YIM 70010^T exhibited a 16S rRNA gene sequence similarity of 99·6 % and DNA–DNA relatedness value of 56 % with Citricoccus muralis DSM 14442^T. The phenotypic characteristics and DNA–DNA relatedness data indicate that strain YIM 70010^T can be distinguished from C. muralis (DSM 14442^T). Therefore, on the basis of the polyphasic taxonomic data presented, a novel species of the genus Citricoccus, Citricoccus alkalitolerans sp. nov. (type strain, YIM 70010^T=CCTCC AA 203008^T=DSM 15665^T=KCTC 19012^T) is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIM 70010^T is AY376164.

An electron micrograph of a cell of strain YIM 70010^T and a dendrogram showing the relationship of the strain with its nearest phylogenetic neighbours are available as supplementary material in IJSEM Online.

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