A transesterification reaction is implicated in the covalent binding of benzo[b]acronycine anticancer agents with DNA and glutathion.
The benzo[b]acronycine derivative S23906-1 has been recently identified as a promising antitumor agent, showing remarkable in vivo activities against a panel of solid tumors. The anticancer activity is attributed to the capacity of the drug to alkylate DNA, selectively at the exocyclic 2-amino group of guanine residues. Hydrolysis of the C-1 and C-2 acetate groups of S23906-1 provides the diol compound S28907-1 which is inactive whereas the intermediate C-2 monoacetate derivative S28687-1 is both highly reactive toward DNA and cytotoxic. The reactivity of this later compound S28687-1 toward two bionucleophiles, DNA and the tripeptide glutathion, has been investigated by mass spectrometry to identify the nature of the (type II) covalent adducts characterized by the loss of the acetate group at position 2. On the basis of NMR and molecular modeling analyses, the reaction mechanism is explained by a transesterification process where the acetate leaving group is transferred from position C-2 to C-1. Altogether, the study validates the reaction scheme of benzo[b]acronycine derivative with its target.
David-Cordonnier
Marie Hélène
MH
INSERM U-524 et Laboratoire de Pharmacologie Antitumorale du Centre Oscar Lambret, IRCL, Lille, 59045, France.
Laine
William
W
Kouach
Mostafa
M
Briand
Gilbert
G
Vezin
Hervé
H
Gaslonde
Thomas
T
Michel
Sylvie
S
Doan Thi Mai
Huong
H
Tillequin
Francois
F
Koch
Michel
M
Léonce
Stéphane
S
Pierré
Alain
A
Bailly
Christian
C
D000175:Acronine / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D000972:Antineoplastic Agents, Phytogenic / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D001665:Binding Sites; D004247:DNA / Q000032:analysis / Q000378:metabolism*; D005978:Glutathione / Q000032:analysis / Q000378:metabolism*; D011485:Protein Binding / Q000502:physiology; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
D000972:Antineoplastic Agents, Phytogenic; D004247:DNA; D005978:Glutathione; D000175:Acronine