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J Bacteriol, June 1998, p. 2911-2914, Vol. 180, No. 11
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

glkA Is Involved in Glucose Repression of Chitinase Production in Streptomyces lividans

Akihiro Saito,1,2 Takeshi Fujii,1 Tadakatsu Yoneyama,2 and Kiyotaka Miyashita1,*

National Institute of Agro-Environmental Sciences, 3-1-1 Kan-nondai, Tsukuba, Ibaraki 305-8604,1 and Institute of Applied Biochemistry, University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-0006,2 Japan

Received 30 December 1997/Accepted 3 April 1998

Chitinase production in Streptomyces lividans is induced by chitin and repressed in the presence of glucose. A mutant of S. lividans TK24, strain G015, which was defective in glucose repression of chitinase production, was obtained by screening colonies for zones of clearing on colloidal chitin agar plates containing 1.0% (wt/vol) glucose. The transcriptional analysis of chiA in G015 with xylE, which encodes catechol 2,3-dioxygenase, as a reporter gene showed that the transcription from the chiA promoter of S. lividans TK24 occurred regardless of the presence of glucose. G015 was resistant to 2-deoxyglucose (2-DOG) and did not utilize glucose as a sole carbon source. When a DNA fragment containing glkA, a gene for glucose kinase, of Streptomyces coelicolor A3(2) was introduced into strain G015 on a low-copy-number plasmid, the sensitivity to 2-DOG, the ability to utilize glucose, and the glucose repression of chitinase production were restored. These results indicate that glkA is involved in glucose repression of chitinase production in S. lividans TK24.

* Corresponding author. Mailing address: National Institute of Agro-Environmental Sciences, 3-1-1 Kan-nondai, Tsukuba, Ibaraki 305-8604, Japan. Phone and fax: (81) 298388256. E-mail: kmiyas{at}ss.niaes.affrc.go.jp.

J Bacteriol, June 1998, p. 2911-2914, Vol. 180, No. 11
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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