Dehydroalanine analog of glutathione: an electrophilic busulfan metabolite that binds to human glutathione S-transferase A1-1.
Elimination of hydrogen sulfide from glutathione (GSH) converts a well known cellular nucleophile to an electrophilic species, gamma-glutamyldehydroalanylglycine (EdAG). We have found that a sulfonium metabolite formed from GSH and busulfan undergoes a facile beta-elimination reaction to give EdAG, which is an alpha,beta-unsaturated dehydroalanyl analog of GSH. EdAG was identified as a metabolite of busulfan in a human liver cytosol fraction. EdAG condenses with GSH in a Michael addition reaction to produce a lanthionine thioether [(2-amino-5-[[3-[2-[[4-amino-5-hydroxy-5-oxopentanoyl]amino]-3-(carboxymethylamino)-3-oxopropyl]sulfanyl-1-(carboxymethylamino)-1-oxopropan-2-yl]amino]-5-oxopentanoic acid); GSG], which is a nonreducible analog of glutathione disulfide. EdAG was less cytotoxic than busulfan to C6 rat glioma cells. GSH and EdAG were equally effective in displacing a glutathione S-transferase (GST) isozyme (human GSTA1-1) from a GSH-agarose column. The finding of an electrophilic metabolite of GSH suggests that alteration of cellular GSH concentrations, irreversible nonreducible glutathionylation of proteins, and interference with GST function may contribute to the toxicity of busulfan.
Younis
Islam R
IR
Department of Basic Pharmaceutical Sciences, West Virginia University, Morgantown, WV 26506, USA.
Elliott
Meenal
M
Peer
Cody J
CJ
Cooper
Arthur J L
AJ
Pinto
John T
JT
Konat
Gregory W
GW
Kraszpulski
Michal
M
Petros
William P
WP
Callery
Patrick S
PS
D000409:Alanine / Q000031:analogs & derivatives; D000818:Animals; D018906:Antineoplastic Agents, Alkylating; D002066:Busulfan / Q000378:metabolism* / Q000494:pharmacology; D045744:Cell Line, Tumor; D005910:Glioma / Q000188:drug therapy; D005978:Glutathione / Q000031:analogs & derivatives* / Q000378:metabolism*; D019803:Glutathione Disulfide / Q000031:analogs & derivatives; D005982:Glutathione Transferase / Q000378:metabolism*; D006801:Humans; D008099:Liver; D051381:Rats
D018906:Antineoplastic Agents, Alkylating; C000603515:gamma-glutamyl-dehydroalanyl-glycine; C015102:dehydroalanine; C484555:GSTA1 protein, human; D005982:Glutathione Transferase; D002066:Busulfan; D005978:Glutathione; D000409:Alanine; D019803:Glutathione Disulfide
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