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Solubilization of cellulosomal cellulases by fusion with cellulose‐binding domain of noncellulosomal cellulase engd from Clostridium cellulovorans
Author(s) -
Murashima Koichiro,
Kosugi Akihiko,
Doi Roy H.
Publication year - 2003
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.10298
Subject(s) - cellulase , cellulosome , clostridium thermocellum , chemistry , escherichia coli , cellulose , biochemistry , clostridium , enzyme , microbiology and biotechnology , bacteria , biology , gene , genetics
Clostridium cellulovorans produces a cellulase complex (cellulosome) as well as noncellulosomal cellulases. In this study, we determined a factor that affected the solubility of the cellulosomal cellulase EngB and the noncellulosomal EngD when they were expressed in Escherichia coli . The catalytic domains of EngB and EngD formed inclusion bodies when expressed in E. coli . On the other hand, both catalytic domains containing the C‐terminal cellulose‐binding domain (CBD) of EngD were expressed in soluble form. Fusion with the CBD of EngD also helped increased the solubility of cellulosomal cellulase EngL upon expression in E. coli . These results indicate that the CBD of EngD plays an important role in the soluble expression of the catalytic domains of EngB, EngL, and EngD. The possible mechanisms of solubilization by fusion of the catalytic domain with the CBD from EngD are discussed. Proteins 2003;50:620–628. © 2003 Wiley‐Liss, Inc.