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Journal of Bacteriology, January 2002, p. 76-81, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.76-81.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Heterologous Production of Clostridium cellulovorans engB, Using Protease-Deficient Bacillus subtilis, and Preparation of Active Recombinant Cellulosomes

Koichiro Murashima,1 Chyi-Liang Chen,2 Akihiko Kosugi,1 Yutaka Tamaru,1 Roy H. Doi,1* and Sui-Lam Wong2

Section of Molecular and Cellular Biology, University of California, Davis, California 95616,1 Division of Cellular, Molecular and Microbial Biology, Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada2

Received 21 May 2001/ Accepted 25 September 2001

In cellulosomes produced by Clostridium spp., the high-affinity interaction between the dockerin domain and the cohesin domain is responsible for the assembly of enzymatic subunits into the complex. Thus, heterologous expression of full-length enzymatic subunits containing the dockerin domains and of the scaffolding unit is essential for the in vitro assembly of a "designer" cellulosome, or a recombinant cellulosome with a specific function. We report the preparation of Clostridium cellulovorans recombinant cellulosomes containing the enzymatic subunit EngB and the scaffolding unit, mini-CbpA, containing a cellulose binding domain, a putative cell wall binding domain, and two cohesin units. The full-length EngB containing the dockerin domain was expressed by Bacillus subtilis WB800, which is deficient in eight extracellular proteases, to prevent the proteolytic cleavage of the enzymatic subunit between the catalytic and dockerin domains that was observed in previous attempts to express EngB with Escherichia coli. The assembly of recombinant EngB with the mini-CbpA was confirmed by immunostaining, a cellulose binding experiment, and native polyacrylamide gel electrophoresis analysis.

* 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, January 2002, p. 76-81, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.76-81.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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