The crystal and molecular structure of Lipase II from Rhizopus niveus was analyzed using X-ray single crystal diffraction data at a resolution of 2.2 A. The structure was refined to an R-factor of 0.19 for all available data. This lipase was purified and crystallized as Lipase I, which contains two polypeptide chains combined through non-covalent interaction ...
The crystal and molecular structure of Lipase II from Rhizopus niveus was analyzed using X-ray single crystal diffraction data at a resolution of 2.2 A. The structure was refined to an R-factor of 0.19 for all available data. This lipase was purified and crystallized as Lipase I, which contains two polypeptide chains combined through non-covalent interaction. However, during crystal growth, Lipase I was converted to Lipase II, which consists of a single polypeptide chain of 269 amino acid residues, by limited proteolysis. The structure of Lipase II shows a typical alpha/beta hydrolase fold containing the so-called nucleophilic elbow. The catalytic center of this enzyme is analogous to those of other neutral lipases and serine proteases. This catalytic center is sheltered by an alpha-helix lid, which appears in neutral lipases, opening the active site at the oil-water interface.
Related Citations:
Purification, Characterization and Crystallization of Two Types of Lipase from Rhizopus Niveus Kohno, M., Kugimiya, W., Hashimoto, Y., Morita, Y. (1994) Biosci Biotechnol Biochem 58: 1007
Preliminary Investigation of Crystals of Lipase I from Rhizopus Niveus Kohno, M., Kugimiya, W., Hashimoto, Y., Morita, Y. (1993) J Mol Biol 229: 785
Organizational Affiliation:
Central Research Institute Tsukuba R&D Center, Fuji Oil Co., Ltd., Ibaraki. kouno@fujioil.co.jp
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