Actinomycetologica
Online ISSN : 1881-6371
Print ISSN : 0914-5818
ISSN-L : 0914-5818
Notes
Gene Organization in a 12-Kilobase Region Converting afsA Encoding an A-Factor Biosynthetic Enzyme
Noriko AndoTakashi UmeyamaKenji UedaSueharu Horinouchi
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1998 Volume 12 Issue 1 Pages 40-45

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Abstract

The nucleotide sequence of a 12-kilobase region covering afsA encoding a key enzyme for A- factor biosynthesis in Streptomyces griseus was determined and open reading frames were deduced by means of G+C plot analysis. Although this region about 150-kb from one end of the linear chromosome is known to be readily deleted, open reading frames crowd the region in a total of eleven, including afsA and sgaA involved in healthy growth on medium of high osmolality. These also include a pair of a sensor histidine kinase and a regulator which comprises a typical prokaryotic two-component regulatory system, proteins similar to O-methyltransferase, LysR-type regulator, 3-ketoacyl-acyl carrier protein reductase, and NADP-dependent alcohol dehydrogenase. In contrast to afsA-like genes in other Streptomyces strains, such as barX locating closely to the gene for the virginiae butanolide receptor in Streptomyces virginiae and farX locating closely to the IM-2-receptor gene in a Streptomyces sp., no open reading frames in this region in S. griseus show homology with the A-factor receptor protein, which suggests that the gene organization of receptor genes for γ-butyrolactone autoregulators differs from strain to strain.

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© 1998 The Society for Actinomycetes Japan
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