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Propeptides are short sequences that facilitate the folding of their associated proteins. The present study found that the propeptide of Rhizomucor miehei lipase (RML) was not proteolytically removed in Escherichia coli. Moreover, RML was not expressed if the propeptide was removed artificially during the cloning process in E. coli. This behavior in E. coli permitted the application of directed evolution...