Inactivation of arginine esterase E-I of Bitis gabonica venom by irreversible inhibitors including a water-soluble carbodiimide, a chloromethyl ketone and isatoic anhydride.
Inactivation of arginine esterase E-I of Bitis gabonica venom by irreversible inhibitors including a water-soluble carbodiimide, a chloromethyl ketone and isatoic anhydride.
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不可逆抑制剂(包括水溶性碳二亚胺、氯甲基酮和靛红酸酐)使 Bitis gabonica 毒液精氨酸酯酶 E-I 失活。
DOI:
10.1016/0020-711x(91)90150-l
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发表时间:
1991
期刊:
影响因子:
--
通讯作者:
M. Oosthuizen
中科院分区:
文献类型:
--
作者:
P. Gravett;C. C. Viljoen;M. Oosthuizen
1. Esterase EI from Bitis gabonica was inactivated with irreversible inhibitors which included studies with a water-soluble carbodiimide, an affinity labelling peptide and a mechanism-based inactivator. 2. The reaction with 1-ethyl-3 (3-dimethylaminopropyl)-carbodiimide was biphasic and the dominant part followed saturation kinetics. At pH 5.5 a rate constant of 0.4 min-1 for inactive enzyme formation was calculated and a dissociation constant (Ki) of 0.2 M for the enzyme-inhibitor complex. 3. Inactivation with D-Phe-Pro-Arg-chloromethyl ketone indicated a two-step mechanism, for which the reaction parameters at pH 8.0 were determined. The Ki value was 0.2 microM and the inactivation rate was 2.5 min-1. 4. With isatoic anhydride pseudo-first-order kinetics was observed. At pH 8.0 a rate constant of 0.9 min-1 and a Ki of 2.0 mM were obtained. The inactivation of the enzyme was found to be governed by a group in the enzyme showing a pK value of 7.3.
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影响因子:
7.3
作者:
Michael H. Gelb;R. Abeles
通讯作者:
Michael H. Gelb;R. Abeles
影响因子:
2.9
作者:
HEDSTROM, L;MOORMAN, AR;ABELES, RH
通讯作者:
ABELES, RH
影响因子:
2.9
作者:
Weidmann,B;Abeles,RH
通讯作者:
Abeles,RH
影响因子:
2.9
作者:
Westkaemper,RB;Abeles,RH
通讯作者:
Abeles,RH
影响因子:
2.9
作者:
Malthouse,JP;Primrose,WU;Mackenzie,NE;Scott,AI
通讯作者:
Scott,AI