NsdB, a TPR-like-domain-containing protein negatively affecting production of antibiotics in Streptomyces coelicolor A3 (2).
Tetratricopeptide repeat (TPR) domains usually mediate protein-protein interactions. NsdA, one of the 70 proteins containing TPR-like domains in Streptomyces coelicolor A3 (2), was previously found to negatively control sporulation and antibiotic production. Here we show that elimination of SCO7252, which encodes another of these proteins, also caused overproduction of two antibiotics, actinorhodin and CDA, but did not affect morphological differentiation. Disruption of SCO1593, encoding another of the family, had no obvious phenotypic effects. In surface-grown cultures, expression of SCO7252, which was named nsdB, was initiated at about 30 h, like that of nsdA. Analysis in silico of the 70 predicted TPR-like-containing proteins of S. coelicolor showed that 32 of them contained only TPR-like domains, and 25 of the remainder contained additional DNA-binding domains, implying that they might control gene expression directly.
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
Li
L
Zhang
Wen-Cheng
WC
Li
Chun-Hua
CH
Zhao
Keith F
KF
Chater
Mei-Feng
MF
Tao
D000880:Anthraquinones / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D004247:DNA / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D010455:Peptides / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D020449:Repetitive Sequences, Amino Acid; D048372:Streptomyces coelicolor / Q000378:metabolism*; D000095622:Benzoisochromanequinones
D000880:Anthraquinones; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D004247:DNA; D010455:Peptides; C040487:CDA antibiotic; C013390:actinorhodin; D000095622:Benzoisochromanequinones