ScholarWorks@숙명여자대학교

초록

Hormone sensitive lipase is a central enzyme in triacylglycerol hydrolysis, lipid modification, and transformation of various lipids. Microbial hormone-sensitive lipases, which are highly similar to a catalytic domain of mammalian equivalents, have attracted strong attention due to their application potentials. Here, characterization and a preliminary X-ray crystallographic analysis of a novel bacterial homologue of hormone-sensitive lipase (HaLip1) from Halocynthiibacter arcticus is reported. Sequence analysis shows that HaLip1 has a conserved serine residue within the GDSAG motif. In addition, a characteristic HGGG motif for oxyanion formation was identified. The HaLip1 protein was overexpressed in E. coli. SDS-PAGE, overlay assay, and mass analysis were performed to confirm purity and activity of HaLip1 protein. Furthermore, HaLip1 was crystallized in a condtion consisting of 25% (w/v) PEG 3350, 0.1 M Hepes-KOH, pH 7.5, 0.2 M sodium chloride. Diffraction data were processed to 1.30 angstrom with an R-merge of 7.3%. The crystals of HaLip1 belong to the P2(1)2(1)2(1), with unit cell parameters of a = 54.6 angstrom, b = 59.5 angstrom, and c = 82.9 angstrom.