The nusG gene of Streptomyces griseus: cloning of the gene and analysis of the A-factor binding properties of the gene product.

The nusG gene of Streptomyces griseus was cloned and the nucleotide sequence determined. It encodes a protein with an identity of 76% to the reported receptor (VbrA) for VB-C, an autoregulatory factor in Streptomyces virginae. NusG protein was expressed in Escherichia coli. However, no binding activity for A-factor, an butyrolactone autoregulator in S. griseus very similar to VB-C, could be detected. The nusG gene of S. griseus does not seem to encode the A-factor-binding protein.