%0 Journal Article %A Zhu, Hong-hui %A Guo, Jun %A Yao, Qing %A Yang, Song-zhen %A Deng, Ming-rong %A Li, Tai-hui %T Streptomyces caeruleatus sp. nov., with dark blue diffusible pigment %D 2011 %J International Journal of Systematic and Evolutionary Microbiology, %V 61 %N 3 %P 507-511 %@ 1466-5034 %R https://doi.org/10.1099/ijs.0.017392-0 %K ISP, International Streptomyces Project %K DAP, diaminopimelic acid %I Microbiology Society, %X An actinomycete, designated strain GIMN4.002T, was isolated from a tomato rhizosphere soil sample in Guangzhou, China. The strain produces white aerial mycelium and dark blue diffusible pigment on Gause's synthetic agar, and microscopic observation revealed that it produces looped chains of spiny spores. Morphological and chemotaxonomic characteristics of the strain are typical of the genus Streptomyces. Melanin was produced and antibacterial activity was detected against Gram-positive micro-organisms, such as Bacillus subtilis, Micrococcus luteus and Staphylococcus aureus. The 16S rRNA gene sequence of strain GIMN4.002T had highest similarity (99.4 %) to Streptomyces lincolnensis B91; however, DNA–DNA relatedness between strain GIMN4.002T and S. lincolnensis NBRC 13054T was only 32.17 %. Further, the morphological, physiological and biochemical characteristics of strain GIMN4.002T are distinct from S. lincolnensis and other species of the genus Streptomyces with which this strain has high 16S rRNA gene sequence similarity (98–99 %). On the basis of the physiological and molecular properties observed, it is proposed that strain GIMN4.002T represents a novel species of the genus Streptomyces, for which the name Streptomyces caeruleatus sp. nov. is proposed, with GIMN4.002T (=CCTCC M 208213T =NRRL B-24802T) as the type strain. %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.017392-0