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Nocardioides kongjuensis sp. nov., an N-acylhomoserine lactone-degrading bacterium

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon 305-600, Korea
² Department of Genetic Engineering, Paichai University, Taejon 302-735, Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr
Jung-Kee Lee
jklee{at}kribb.re.kr

A Gram-positive, rod- or coccoid-shaped and N-hexanoyl-L-homoserine lactone-degrading bacterial strain, A2-4^T, was isolated from a soil in Korea, and its taxonomic position was investigated by using a polyphasic approach. Strain A2-4^T grew optimally at pH 7.0–8.0 and 30 °C without NaCl. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain A2-4^T is most closely related to members of the genus Nocardioides. Strain A2-4^T possessed chemotaxonomic properties indicative of members of the genus Nocardioides; the cell-wall peptidoglycan type was based on LL-diaminopimelic acid, MK-8(H₄) was the predominant menaquinone and iso-C_{16 : 0} was the predominant fatty acid. The DNA G+C content was 72.1 mol%. The 16S rRNA gene sequence of strain A2-4^T was 98.3–99.1 % similar to those of the type strains of Nocardioides simplex, Nocardioides aromaticivorans and Nocardioides nitrophenolicus and 93.8–96.3 % similar to those of the type strains of other Nocardioides species. Strain A2-4^T could be distinguished from the three phylogenetic relatives, N. nitrophenolicus, N. aromaticivorans and N. simplex, by DNA–DNA relatedness (25–42 %) and by differences in some phenotypic characteristics. On the basis of the phenotypic, phylogenetic and genetic data, the strain represents a novel species of the genus Nocardioides, for which the name Nocardioides kongjuensis sp. nov. is proposed. The type strain is A2-4^T (=KCTC 19054^T=JCM 12609^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain A2-4^T is DQ218275.

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