Abstract
The celA1 gene encoding an endo-beta-1,4-glucanase from a mesophilic actinomycete, strain JM8, identified as Streptomyces halstedii, was cloned and expressed in S. lividans JI66. From the nucleotide sequence of a 1.7-kb DNA fragment we identified an open reading frame of 963 nucleotides encoding a protein of 321 amino acids, starting at TTG (instead of ATG). The Cel1 mature enzyme is a protein of 294 amino acids (after signal peptide cleavage) and can be included in the beta-glycanase family B (N. R. Gilkes, B. Henrissat, D. G. Kilburn, R. C. Miller, Jr., and R. A. J. Warren, Microbiol. Rev. 55:303-315, 1991). The Cel1 enzyme lacks a cellulose-binding domain as predicted by computer analysis of the sequence and confirmed by Avicel binding experiments. The promoter region of celA1 was identified by S1 mapping; the -35 region closely resembles those of housekeeping Streptomyces promoters. Three imperfectly repeated sequences of 15, 15, and 14 nucleotides were found upstream from celA1 [ATTGGGACCGCTTCC-(N85)-ATTGGGACCGCTTCC-(N2)-TGGGAGC GCTCCCA]; The 14-nucleotide sequence has a perfect palindrome identical to that found in several cellulase-encoding genes from Thermomonospora fusca, an alkalophilic Streptomyces strain, and Streptomyces lividans. This sequence has been implicated in the mechanism of induction exerted by cellobiose. Using an internal celA1 probe, we detected similar genes in several other Streptomyces species, most of them cellulase producers.
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