Comparison of MeCPA activity obtained from three different protocols. (◆), Buffer only control; (■), Clarified cells lysate was immediately subjected to amylose affinity chromatography, digested with thermolysin and assayed; (▲), Clarified cell lysate was incubated overnight at 4 C, then subjected to amylose affinity chromatography, digested immediately afterward by thermolysin and assayed; (●), Clarified cell lysate was immediately subjected to amylose affinity chromatography and then incubated overnight prior to thermolysin digestion and activity assay.