Isolation and characterization of a novel bacterial strain Shewanella marinisediminis sp. nov. from deep-sea sediments.

ABSTRACT

A new bacterial strain designated DH39T was isolated from marine sediment collected from the East Sea, Korea. Phylogenetic analysis using the 16S rRNA gene sequence revealed that strain DH39T clustered with the genus Shewanella and is closely related to Shewanella canadensis HAW-EB2T, S. woodyi MS32T, and S. sediminis HAW-EB3Twith 98.1, 97.8, and 97.6% sequence similarities, respectively. The isolated bacterium was Gram-negative, rod-shaped, and aerobic. Its temperature range for growth was 4–30°C. The predominant fatty acids were 161w7, 171w8, 130-i, 160, and 150-i. The DNA G+C content was 45.0 mol%. DNA-DNA hybridization analysis showed that DNA-DNA relatedness values in the 16S rRNA phylogenetic tree of strain DH39T and its nearest neighbors S. hanedai and S. sediminis were 52.9 and 58.7%. Phylogenetic evidence and phenotypic characteristics suggest strain DH39T constitutes a novel Shewanella species. Therefore, we propose Shewanella marinisediminis sp. nov., with DH39T (KCCM 42936T = NCCB 100311T) as the type strain.