Purification of recombinant endoglucanase GH5-CBM72-CBM72 expressed in Escherichia coli

In a previous study, a gene GL0694641 coding for endoglucanase containing 3 domains GH5- CBM72-CBM72 was exploited from metagenomic DNA data of bacteria in Vietnamese goats’ rumen. The gene (eg5) encoding the mature enzyme (without signal peptide coding sequence) was optimized codons, artificially synthesized, and inserted into the pET22b(+) vector at NcoI and XhoI to generate expression vector pET22-eg5 for expression of the gene in Eschrichia coli.