| Carboxylesterase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 Structure of ethylphosphorylated Butyrylcholinesterase.[1] | |||||||||
| Identifiers | |||||||||
| Symbol | COesterase | ||||||||
| Pfam | PF00135 | ||||||||
| InterPro | IPR002018 | ||||||||
| PROSITE | PDOC00112 | ||||||||
| SCOP2 | 1acj / SCOPe / SUPFAM | ||||||||
| OPM superfamily | 127 | ||||||||
| OPM protein | 1p0i | ||||||||
| CDD | cd00312 | ||||||||
| |||||||||
Carboxylesterase, type B is a family of evolutionarily related proteins that belongs to the superfamily of proteins with the Alpha/beta hydrolase fold.
Higher eukaryotes have many distinct esterases. The different types include those that act on carboxylic esters (EC 3.1.1). Carboxyl-esterases have been classified into three categories (A, B and C) on the basis of differential patterns of inhibition by organophosphates. The sequence of a number of type-B carboxylesterases indicates[2][3][4] that the majority are evolutionarily related. As is the case for lipases and serine proteases, the catalytic apparatus of esterases involves three residues (catalytic triad): a serine, a glutamate or aspartate and a histidine.
- ^ Nachon F, Asojo OA, Borgstahl GE, Masson P, Lockridge O (February 2005). "Role of water in aging of human butyrylcholinesterase inhibited by echothiophate: the crystal structure suggests two alternative mechanisms of aging". Biochemistry. 44 (4): 1154–62. CiteSeerX 10.1.1.529.7283. doi:10.1021/bi048238d. PMID 15667209.
- ^ Myers M, Richmond RC, Oakeshott JG (1988). "On the origins of esterases". Mol. Biol. Evol. 5 (2): 113–119. doi:10.1093/oxfordjournals.molbev.a040485. PMID 3163407.
- ^ Chatonnet A, Krejci E, Duval N, Vincens P, Massoulie J (1991). "Cholinesterase-like domains in enzymes and structural proteins: functional and evolutionary relationships and identification of a catalytically essential aspartic acid". Proc. Natl. Acad. Sci. U.S.A. 88 (15): 6647–6651. Bibcode:1991PNAS...88.6647K. doi:10.1073/pnas.88.15.6647. PMC 52145. PMID 1862088.
- ^ Sussman JL, Cygler M, Harel M, Silman I, Schrag JD, Doctor BP, Gentry MK (1993). "Relationship between sequence conservation and three-dimensional structure in a large family of esterases, lipases, and related proteins". Protein Sci. 2 (3): 366–382. doi:10.1002/pro.5560020309. PMC 2142374. PMID 8453375.