title: Thermostabilization of Bacillus subtilis lipase A by minimizing the structural deformation caused by packing enhancement.
abstract: Enzyme thermostabilization is a critical research topic due to potential industrial benefits. Among the various reasons to increase enzyme thermostability, enhancement of residual packing at the core of the enzyme structure has been commonly accepted as a successful strategy. However, structural changes that occur with residual packing enhancement may decrease enzyme activity. In this study, a strategy to minimize structural deformation by calculating the overlapping packing volume of a single-point mutation followed by applying a double-point mutation was suggested. Four double mutants, A38V_K23A, A75V_T83A, G80A_N106A, and G172A_V100A, were selected for the in vitro experiment; three of the four showed enhancements in both thermostability and catalytic activity. In particular, G80A_N106A showed 2.78 times higher catalytic activity compared with wild type.
authors.affiliation: School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-742, Korea.
authors.forename: Hong Seung
authors.initials: HS
authors.lastname: Yun
authors.forename: Hyun June
authors.initials: HJ
authors.lastname: Park
authors.forename: Jeong Chan
authors.initials: JC
authors.lastname: Joo
authors.forename: Young Je
authors.initials: YJ
authors.lastname: Yoo
mesh_terms: D019943:Amino Acid Substitution; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics; D001665:Binding Sites; D055162:Biocatalysis; D003198:Computer Simulation; D004795:Enzyme Stability; D057927:Hydrophobic and Hydrophilic Interactions; D008049:Lipase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D016297:Mutagenesis, Site-Directed; D015202:Protein Engineering / Q000379:methods*
chemical_list: D008049:Lipase