期刊
MOLECULAR PHARMACOLOGY
卷 62, 期 2, 页码 220-224出版社
AMER SOC PHARMACOLOGY EXPERIMENTAL THERAPEUTICS
DOI: 10.1124/mol.62.2.220
关键词
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资金
- NIDA NIH HHS [DA011707] Funding Source: Medline
To address the problem of acute cocaine overdose, we undertook molecular engineering of butyrylcholinesterase (BChE) as a cocaine hydrolase so that modest doses could be used to accelerate metabolic clearance of this drug. Molecular modeling of BChE complexed with cocaine suggested that the inefficient hydrolysis (k(cat) = 4 min(-1)) involves a rotation toward the catalytic triad, hindered by Tyr332. To eliminate rotational hindrance and retain substrate affinity, we introduced two amino acid substitutions (Ala328Trp/Tyr332Ala). The resulting mutant BChE reduced cocaine burden in tissues, accelerated plasma clearance by 20-fold, and prevented cocaine-induced hyperactivity in mice. The enzyme's kinetic properties (k(cat) = 154 min(-1), K-M = 18 muM) satisfy criteria suggested previously for treating cocaine overdose (k(cat) > 120 min(-1), K-M < 30 mu M). This success demonstrates that computationally guided mutagenesis can generate functionally novel enzymes with clinical potential.
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