Molecular reasons for lipase-sensitivity against acetaldehyde

被引:56
作者
Weber, HK
Zuegg, J
Faber, K
Pleiss, J
机构
[1] GRAZ UNIV TECHNOL,INST ORGAN CHEM,A-8010 GRAZ,AUSTRIA
[2] UNIV STUTTGART,INST TECH BIOCHEM,D-70569 STUTTGART,GERMANY
关键词
lipase deactivation; pK(a)-value; lysine residue accessibility; Schiff base;
D O I
10.1016/S1381-1177(96)00045-8
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The molecular reasons for the sensitivity of microbial lipases towards acetaldehyde, emerging as unavoidable by-product from acyl transfer reactions employing vinyl esters as acyl donors, were shown to be associated with specific properties of lysine residues. Since the mechanism of deactivation involves the formation of Schiff bases at the lysine epsilon-amino groups, the relative reactivity (i.e, nucleophilicity) of each residue was estimated by using an electronic (pK(a) value) and a steric parameter (accessible surface area of the side chain). Sensitive lipases, as from Candida rugosa and Geotrichum candidum, possess several lysine residues that have high pK(a) values(> 12) and are highly exposed to the solvent (surface areas of 210-220 Angstrom). In contrast, the lysine groups of stable lipases like from Rhizomucor miehei, Candida antarctica B and Pseudomonas glumae have moderate pK(a) values (up to 11.6) and are rather buried (surface areas of 130-150 Angstrom(2)). A close investigation of Candida rugosa lipase revealed that the most exposed lysine residues are located in the lid region (Lys75 and Lys85). The data suggest that Lys75, which is involved in fixing the lid in its open conformation, is presumably the prime target for deactivation by acetaldehyde.
引用
收藏
页码:131 / 138
页数:8
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