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Journal of Bacteriology, April 2000, p. 1883-1888, Vol. 182, No. 7
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Bacillus subtilis yabG Gene Is Transcribed by SigK RNA Polymerase during Sporulation, and yabG Mutant Spores Have Altered Coat Protein Composition

Hiromu Takamatsu,1 Takeko Kodama,1 Atsuo Imamura,1 Kei Asai,2 Kazuo Kobayashi,2 Tatsuo Nakayama,3 Naotake Ogasawara,2 and Kazuhito Watabe1,*

Faculty of Pharmaceutical Sciences, Setsunan University, Osaka,1 Nara Institute of Science and Technology, Nara,2 and Miyazaki Medical College, Department of Biochemistry, Miyazaki,3 Japan

Received 9 November 1999/Accepted 14 January 2000

The expression of six novel genes located in the region from abrB to spoVC of the Bacillus subtilis chromosome was analyzed, and one of the genes, yabG, had a predicted promoter sequence conserved among SigK-dependent genes. Northern blot analysis revealed that yabG mRNA was first detected from 4 h after the cessation of logarithmic growth (T4) in wild-type cells and in a gerE36 (GerE-) mutant but not in spoIIAC (SigF-), spoIIGAB (SigE-), spoIIIG (SigG-), and spoIVCB (SigK-) mutants. The transcription start point was determined by primer extension analysis; the -10 and -35 regions are very similar to the consensus sequences recognized by SigK-containing RNA polymerase. Inactivation of the yabG gene by insertion of an erythromycin resistance gene did not affect vegetative growth or spore resistance to heat, chloroform, and lysozyme. The germination of yabG spores in L-alanine and in a mixture of L-asparagine, D-glucose, D-fructose, and potassium chloride was also the same as that of wild-type spores. On the other hand, the protein preparation from yabG spores included 15-, 18-, 21-, 23-, 31-, 45-, and 55-kDa polypeptides which were low in or not extracted from wild-type spores under the same conditions. We determined their N-terminal amino acid sequence and found that these polypeptides were CotT, YeeK, YxeE, CotF, YrbA (31 and 45 kDa), and SpoIVA, respectively. The fluorescence of YabG-green fluorescent protein fusion produced in sporulating cells was detectable in the forespores but not in the mother cell compartment under fluorescence microscopy. These results indicate that yabG encodes a sporulation-specific protein which is involved in coat protein composition in B. subtilis.

* Corresponding author. Mailing address: Faculty of Pharmaceutical Sciences, Setsunan University, Hirakata, Osaka 573-0101, Japan. Phone and fax: (81) 72-866-3112 or -3114. E-mail: watabe{at}pharm.setsunan.ac.jp.

Journal of Bacteriology, April 2000, p. 1883-1888, Vol. 182, No. 7
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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