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Eggshell membrane is a mechanically stable and insoluble cross-linked fibrous protein. Pseudomonas aeruginosa strain ME-4 synthesizes a metalloprotease that degrades the eggshell membrane. We cloned the encoding gene in Escherichia coli. The recombinant protease, over-expressed in E. coli, was inactive but addition of acetone to crude cell extracts restored the activity and removed many E. coli proteins. We purified the active, acetone-treated protease to homogeneity in a single chromatography step with 57% recovery. The recombinant protease partially hydrolyzed eggshell membrane and produced more soluble peptides and proteins than commercial elastase, α-chymotrypsin, and collagenase. The soluble peptides produced from hydrolyzed eggshell membrane inhibited angiotensin-I-converting enzyme activity. The degradation of eggshell membrane by the recombinant elastase could be applied to the production of soluble bioactive peptides.
Biotechnology Letters – Springer Journals
Published: Jan 29, 2012
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