Abstract
Cholinesterases are serine esterases that rapidly hydrolyze the neurotransmitter acetylcholine. In humans, cholinesterases exhibit extensive polymorphism in terms of their substrate specificity, sensitivity to selective inhibitors, hydrophobicity, and cellular as well as subcellular localization. It is not yet known whether the various cholinesterase forms originate from different genes or are products of posttranscriptional and posttranslational processing. The extent to which these enzyme forms are homologous in their amino acid sequence is also not known. However, a consensus organophosphate-binding hexapeptide sequence Phe-Gly-Glu-Ser-Ala-Gly was found both in "true" acetylcholinesterase from the electric organ of Torpedo [McPhee-Quigley et al: J Biol Chem 260:12185-12189, 1985] and in "pseudocholinesterase" (butyrylcholinesterase) from human serum [Lockridge: "Cholinesterases--Fundamental and Applied Aspects." New York: de Gruyter pp 5-12, 1984], suggesting that this region in the protein is conserved in all cholinesterases. Based on this common sequence, we prepared synthetic oligodeoxynucleotides and used them as labeled probes to screen a cDNA library from fetal human brain mRNA, cloned in lambda gt10 phages. A cDNA clo...Continue Reading
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