DIFFERENCES IN CONFORMATIONAL STABILITY BETWEEN NATIVE AND PHOSPHORYLATED ACETYLCHOLINESTERASE AS EVIDENCED BY A MONOCLONAL-ANTIBODY

被引:24
作者
ASHANI, Y
GENTRY, MK
DOCTOR, BP
机构
[1] WALTER REED ARMY MED CTR,DIV BIOCHEM,WASHINGTON,DC 20307
[2] ISRAEL INST BIOL RES,IL-70450 NESS ZIONA,ISRAEL
关键词
D O I
10.1021/bi00462a004
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
Monoclonal antibody 25 Bl generated against diisopropyl phosphorofluoridate inhibited fetal bovine serum acetylcholinesterase has been extensively characterized with respect to its anticholinesterase properties. This antibody demonstrated considerably different properties from previously reported inhibitory antibodies raised against acetylcholinesterase in terms of the degree of inhibition (>98%), the high degree of specificity, and the stability of the antigen-antibody complex. Monoclonal antibody 25B1 appears to be directed against a conformational epitope located in close proximity to the catalytic center of the enzyme and was found to be most suitable for studying the stabilization of the active site of acetylcholinesterase against denaturation by heat or guanidine following phosphorylation by organophosphorus anticholinesterase compounds. This approach allowed the determination of stability rank order of various phosphorylated acetylcholinesterases. Among all the organophosphates tested, the combination of a methyl group and a negatively charged oxygen attached to the P atom, CH3P(O)(O‒)-AChE, conferred the greatest protection to the active site of aged or nonaged organophosphoryl conjugates of acetylcholinesterase. © 1990, American Chemical Society. All rights reserved.
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页码:2456 / 2463
页数:8
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