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Journal of Bacteriology, October 2000, p. 5906-5910, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Large Gene Cluster for the Clostridium cellulovorans Cellulosome

Yutaka Tamaru,1 Shuichi Karita,2 Atef Ibrahim,3 Helen Chan,1 and Roy H. Doi1,*

Section of Molecular and Cellular Biology, University of California, Davis, California 956161; Center for Molecular Biology and Genetics, Mie University, Tsu, Japan2; and Biotechnology and Genetic Engineering Institute, Menoufiya University, Sadat City, Egypt3

Received 6 March 2000/Accepted 14 July 2000

A large gene cluster for the Clostridium cellulovorans cellulosome has been cloned and sequenced upstream and downstream of the cbpA and exgS genes (C.-C. Liu and R. H. Doi, Gene 211:39-47, 1998). Gene walking revealed that the engL gene cluster (Y. Tamaru and R. H. Doi, J. Bacteriol. 182:244-247, 2000) was located downstream of the cbpA-exgS genes. Further DNA sequencing revealed that this cluster contains the genes for the scaffolding protein CbpA, the exoglucanase ExgS, several endoglucanases of family 9, the mannanase ManA, and the hydrophobic protein HbpA containing a surface layer homology domain and a hydrophobic (or cohesin) domain. The sequence of the clustered genes is cbpA-exgS-engH-engK-hbpA-engL-manA-engM-engN and is about 22 kb in length. The engN gene did not have a complete catalytic domain, indicating that engN is a truncated gene. This large gene cluster is flanked at the 5' end by a putative noncellulosomal operon consisting of nifV-orf1-sigX-regA and at the 3' end by noncellulosomal genes with homology to transposase (trp) and malate permease (mle). Since gene clusters for the cellulosome are also found in C. cellulolyticum and C. josui, they seem to be typical of mesophilic clostridia, indicating that the large gene clusters may arise from a common ancestor with some evolutionary modifications.

* Corresponding author. Mailing address: Section of Molecular and Cellular Biology, University of California, Davis, CA 95616. Phone: (530) 752-3191. Fax: (530) 752-3085. E-mail: rhdoi{at}ucdavis.edu.

Journal of Bacteriology, October 2000, p. 5906-5910, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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