2y1k

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2y1k, resolution 2.50Å ()
Ligands: , , , , , ,
Non-Standard Residues:
Activity: Cholinesterase, with EC number 3.1.1.8
Related: 2xqk, 2wsl, 2j4c, 2xmb, 2xmg, 2wik, 1kcj, 1p0p, 1xlu, 2wij, 2xmd, 1xlv, 1eho, 2xqi, 1p0m, 2xqj, 1xlw, 1ehq, 1p0q, 2xmc, 2wid, 2xqf, 2wil, 2xqg, 2wif, 1p0i, 2wig


Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml


Contents

STRUCTURE OF HUMAN BUTYRYLCHOLINESTERASE INHIBITED BY CBDP (12H SOAK): PHOSPHOSERINE ADDUCT

Publication Abstract from PubMed

Aerotoxic syndrome is assumed to be caused by exposure to tricresyl phosphate (TCP), an antiwear additive in jet engine lubricants and hydraulic fluid. CBDP (2-(ortho-cresyl)-4H-1,2,3-benzodioxaphosphoran-2-one) is the toxic metabolite of triortho-cresylphosphate, a component of TCP. Human butyrylcholinesterase (BChE; EC 3.1.1.8) and human acetylcholinesterase (AChE; EC 3.1.1.7) are irreversibly inhibited by CBDP. The bimolecular rate constants of inhibition (k(i)), determined under pseudo-first-order conditions, displayed a biphasic time course of inhibition with k(i) of 1.6 x 10(8) M(-1) min(-1) and 2.7 x 10(7) M(-1) min(-1) for E and E' forms of BChE. The inhibition constants for AChE were 1 to 2 orders of magnitude slower than those for BChE. CBDP-phosphorylated cholinesterases are nonreactivatable due to ultra fast aging. Mass spectrometry analysis showed an initial BChE adduct with an added mass of 170 Da from cresylphosphate, followed by dealkylation to a structure with an added mass of 80 Da. Mass spectrometry in (18)O-water showed that (18)O was incorporated only during the final aging step to form phospho-serine as the final aged BChE adduct. The crystal structure of CBDP-inhibited BChE confirmed that the phosphate adduct is the ultimate aging product. CBDP is the first organophosphorus agent that leads to a fully dealkylated phospho-serine BChE adduct.

Reaction of Cresyl Saligenin Phosphate, the Organophosphorus Agent Implicated in Aerotoxic Syndrome, with Human Cholinesterases: Mechanistic Studies Employing Kinetics, Mass Spectrometry, and X-ray Structure Analysis., Carletti E, Schopfer LM, Colletier JP, Froment MT, Nachon F, Weik M, Lockridge O, Masson P, Chem Res Toxicol. 2011 Jun 20;24(6):797-808. Epub 2011 Apr 18. PMID:21438623

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Disease

[CHLE_HUMAN] Defects in BCHE are the cause of butyrylcholinesterase deficiency (BChE deficiency) [MIM:177400]. BChE deficiency is a metabolic disorder characterized by prolonged apnoea after the use of certain anesthetic drugs, including the muscle relaxants succinylcholine or mivacurium and other ester local anesthetics. The duration of the prolonged apnoea varies significantly depending on the extent of the enzyme deficiency. BChE deficiency is a multifactorial disorder. The hereditary condition is transmitted as an autosomal recessive trait.

Function

[CHLE_HUMAN] Esterase with broad substrate specificity. Contributes to the inactivation of the neurotransmitter acetylcholine. Can degrade neurotoxic organophosphate esters.[1][2]

About this Structure

2y1k is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

See Also

Reference

  • Carletti E, Schopfer LM, Colletier JP, Froment MT, Nachon F, Weik M, Lockridge O, Masson P. Reaction of Cresyl Saligenin Phosphate, the Organophosphorus Agent Implicated in Aerotoxic Syndrome, with Human Cholinesterases: Mechanistic Studies Employing Kinetics, Mass Spectrometry, and X-ray Structure Analysis. Chem Res Toxicol. 2011 Jun 20;24(6):797-808. Epub 2011 Apr 18. PMID:21438623 doi:10.1021/tx100447k
  1. Chilukuri N, Duysen EG, Parikh K, diTargiani R, Doctor BP, Lockridge O, Saxena A. Adenovirus-transduced human butyrylcholinesterase in mouse blood functions as a bioscavenger of chemical warfare nerve agents. Mol Pharmacol. 2009 Sep;76(3):612-7. doi: 10.1124/mol.109.055665. Epub 2009 Jun, 19. PMID:19542320 doi:10.1124/mol.109.055665
  2. Amitay M, Shurki A. The structure of G117H mutant of butyrylcholinesterase: nerve agents scavenger. Proteins. 2009 Nov 1;77(2):370-7. doi: 10.1002/prot.22442. PMID:19452557 doi:10.1002/prot.22442

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