Abstract
A novel lipase lipB from Serratia marcescens ECU1010 is highly stable in the presence of organic solvents. By sequence and structure comparison with homologous lipase lipA, three amino acid residues were found to be different between them. To identify the residues which increase the organic solvent stability of lipB, residues that potentially provide this stability were mutated to the ones of lipA at equivalent positions. The replacement of Gly at position 33 by Asp obviously decreased its stability in organic solvents. Molecular modeling and structural analysis also suggested that the Gly33 residue is important for the organic solvent stability of lipB.
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