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The two protein components, II and III, of the 4-chlorobenzoate dehalogenase from Pseudomonas sp. CBS3 were cloned separately into Escherichia coli. Component II was obtained on plasmid pCBSII, containing a 3.0 kbp HindIII fragment, and component III on plasmid pCBSIIIb, containing a 1.3 kbp SalI/PstI fragment. The identities of the two components were confirmed by comparison with the authentic components from Pseudomonas sp. CBS3. Both components were expressed constitutively in E. coli. Neither component alone showed dehalogenating activity. Only in the mixture of crude extracts from both clones was 4-chlorobenzoate dehalogenase detectable. The specific activities in E. coli crude extracts were 2.9 mU (mg protein)-1 for component II and 3.5 mU (mg protein)-1 for component III. Expression analysis by minicell experiments revealed a single polypeptide chain of 29 kDa for component III and of 31 kDa for component III.

Separate cloning and expression analysis of two protein components of 4-chlorobenzoate dehalogenase from Pseudomonas sp. C8S3