Relationships of human α/β hydrolase fold proteins and other organophosphate-interacting proteins.
Organophosphates (OPs) are either found in nature or synthetized for use as pesticides, flame retardants, neurotoxic warfare agents or drugs (cholinergic enhancers in Alzheimer's disease and myasthenia gravis, or inhibitors of lipases in metabolic diseases). Because of the central role of acetylcholinesterase cholinergic neurotransmission in humans, one of the main purposes for using OPs is inactivation of the enzyme by phosphorylation of the nucleophilic serine residue in the active center. However, hundreds of serine hydrolases are expressed in the human proteome, and many of them are potential targets for OP adduction. In this review, we first situate the α/β hydrolase fold proteins among the distinctively folded proteins known to interact with OPs, in particular the different lipases, peptidases, and enzymes hydrolyzing OPs. Second, we compile the human α/β hydrolases and review those that have been experimentally shown to interact with OPs. Among the 120 human α/β hydrolase fold proteins, 102 have a serine in the consensus GXSXG pentapeptide compatible with an active site, 6 have an aspartate or a cysteine as the active site nucleophile residue, and 12 evidently lack an active site. 76 of the 120 have been experimentally shown to bind an OP.
Dynamique Musculaire et Métabolisme, INRA, Université Montpellier, Place Viala, Montpellier, France; Architecture et Fonction des Macromolécules Biologiques, CNRS/Aix-Marseille Université, Campus Luminy, Marseille, France.
Nicolas
N
Lenfant
Architecture et Fonction des Macromolécules Biologiques, CNRS/Aix-Marseille Université, Campus Luminy, Marseille, France.
Yves
Y
Bourne
Architecture et Fonction des Macromolécules Biologiques, CNRS/Aix-Marseille Université, Campus Luminy, Marseille, France.
Pascale
P
Marchot
Dynamique Musculaire et Métabolisme, INRA, Université Montpellier, Place Viala, Montpellier, France. Electronic address: chatonne@supagro.inra.fr.
Arnaud
A
Chatonnet
D055162:Biocatalysis / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D006867:Hydrolases / Q000737:chemistry* / Q000378:metabolism*; D010755:Organophosphates / Q000737:chemistry* / Q000378:metabolism*; D011485:Protein Binding / Q000187:drug effects; D017433:Protein Structure, Secondary
D004791:Enzyme Inhibitors; D010755:Organophosphates; D006867:Hydrolases
Acetylcholinesterase; Lipase; Nucleophile; Organophosphate; Peptidase; α/β-hydrolase fold proteins