[Objective] The aim was to study the effects of heavy metal stress on the protein content of microorganisms.[Method] By using traditional microbiological culture method,four typical microorganisms(including Escherichia coli,Bacillus subtilis,Saccharomyces cerevisiae Hansen and Streptomycetaceae) were cultured under the stress of heavy metal ions(like Hg2+,Cd2+,Cr6+ and Pb2+) with different concentrations,and the effects of heavy metal stress on the synthesis of protein in four typical microorganisms were discussed through measuring protein content.[Result] Heavy metals with low concentration were beneficial to the synthesis of protein in four typical microorganisms to a certain extent,but the synthesis of protein in four typical microorganisms was inhibited differently with the increase of heavy metal concentration.The tolerance of B.subtilis to four heavy metals was stronger compared with other three microorganisms,and the four heavy metals with concentration of 5-50 mg/L promoted the protein synthesis of B.subtilis.Cr6+ with low concentration promoted the protein synthesis of E.coli greatly;Pb2+ inhibited the protein synthesis of E.coli obviously,and promoted the protein synthesis of other three microorganisms under certain concentration;Cd2+ with low concentration was beneficial to the protein synthesis of four microorganisms.[Conclusion] The study could provide theoretical foundation for discussing the physiological response of microorganism to heavy metal stress.
LI Shu-yingDONG Shi-haoSU Ya-liZHOU Yuan-qingLI Hong-mei
