期刊
MARINE BIOTECHNOLOGY
卷 13, 期 2, 页码 284-295出版社
SPRINGER
DOI: 10.1007/s10126-010-9298-7
关键词
Digestion; Lipase; Purification; Penaeus vannamei; Crustaceans
资金
- Consejo Nacional de Ciencia y Tecnologia of Mexico
Penaeus vannamei lipase was purified from midgut gland of whiteleg shrimp. Pure lipase (E.C. 3.1.1.3) was obtained after Superdex 200 gel filtration and Resource Q anionic exchange. The pure lipase, which is a glycosylated molecule, is a monomer having a molecular mass of about 44.8 kDa, as determined by SDS-PAGE analysis. The lipase hydrolyses short and long-chain triacylglycerols and naphthol derivates at comparable rates. A specific activity of 1787 U mg(-1) and 475 U mg(-1) was measured with triolein and tributyrin as substrates, respectively, at pH 8.0 and 30A degrees C in the absence of colipase. The lipase showed a K (m, app) of 3.22 mM and k (cat, app)/K (m, app) of 0.303 x 10(3) mM(-1) s(-1) using triolein as substrate. Natural detergents, such as sodium deoxycholate, act as potent inhibitors of the lipase. This inhibition can be reversed by adding fresh oil emulsion. Result with tetrahydrolipstatin, an irreversible inhibitor, suggests that the lipase is a serine enzyme. Peptide sequences of the lipase were determined and compared with the full-length sequence of lipase which was obtained by the rapid amplification of cDNA ends method. The full cDNA of the pvl was 1,186 bp, with a deduced protein of 362 amino acids that includes a consensus sequence (GXSXG) of the lipase superfamily of alpha/beta-hydrolase. The gene exhibits features of conserved catalytic residues and high homology with various mammalian and insect lipase genes. A potential lid sequence is suggested for pvl.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据