Structural insights into abasic site for Fpg specific binding and catalysis: comparative high-resolution crystallographic studies of Fpg bound to various models of abasic site analogues-containing DNA
Identifieur interne : 000177 ( France/Analysis ); précédent : 000176; suivant : 000178Structural insights into abasic site for Fpg specific binding and catalysis: comparative high-resolution crystallographic studies of Fpg bound to various models of abasic site analogues-containing DNA
Auteurs : Karine Pereira De Je Sus ; Laurence Serre [France] ; Charles Zelwer ; Bertrand CastaingSource :
- Nucleic Acids Research [ 0305-1048 ] ; 2005.
Abstract
Fpg is a DNA glycosylase that recognizes and excises the mutagenic 8-oxoguanine (8-oxoG) and the potentially lethal formamidopyrimidic residues (Fapy). Fpg is also associated with an AP lyase activity which successively cleaves the abasic (AP) site at the 3′ and 5′ sides by βδ-elimination. Here, we present the high-resolution crystal structures of the wild-type and the P1G defective mutant of Fpg from Lactococcus lactis bound to 14mer DNA duplexes containing either a tetrahydrofuran (THF) or 1,3-propanediol (Pr) AP site analogues. Structures show that THF is less extrahelical than Pr and its backbone C5′–C4′–C3′ diverges significantly from those of Pr, rAP, 8-oxodG and FapydG. Clearly, the heterocyclic oxygen of THF is pushed back by the carboxylate of the strictly conserved E2 residue. We can propose that the ring-opened form of the damaged deoxyribose is the structure active form of the sugar for Fpg catalysis process. Both structural and functional data suggest that the first step of catalysis mediated by Fpg involves the expulsion of the O4′ leaving group facilitated by general acid catalysis (involving E2), rather than the immediate cleavage of the N-glycosic bond of the damaged nucleoside.
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DOI: 10.1093/nar/gki879
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Fpg is also associated with an AP lyase activity which successively cleaves the abasic (AP) site at the 3′ and 5′ sides by βδ-elimination. Here, we present the high-resolution crystal structures of the wild-type and the P1G defective mutant of Fpg from Lactococcus lactis bound to 14mer DNA duplexes containing either a tetrahydrofuran (THF) or 1,3-propanediol (Pr) AP site analogues. Structures show that THF is less extrahelical than Pr and its backbone C5′–C4′–C3′ diverges significantly from those of Pr, rAP, 8-oxodG and FapydG. Clearly, the heterocyclic oxygen of THF is pushed back by the carboxylate of the strictly conserved E2 residue. We can propose that the ring-opened form of the damaged deoxyribose is the structure active form of the sugar for Fpg catalysis process. Both structural and functional data suggest that the first step of catalysis mediated by Fpg involves the expulsion of the O4′ leaving group facilitated by general acid catalysis (involving E2), rather than the immediate cleavage of the N-glycosic bond of the damaged nucleoside.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement></list><tree><noCountry><name sortKey="Castaing, Bertrand" sort="Castaing, Bertrand" uniqKey="Castaing B" first="Bertrand" last="Castaing">Bertrand Castaing</name><name sortKey="De Je Sus, Karine Pereira" sort="De Je Sus, Karine Pereira" uniqKey="De Je Sus K" first="Karine Pereira" last="De Je Sus">Karine Pereira De Je Sus</name><name sortKey="Zelwer, Charles" sort="Zelwer, Charles" uniqKey="Zelwer C" first="Charles" last="Zelwer">Charles Zelwer</name></noCountry><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Serre, Laurence" sort="Serre, Laurence" uniqKey="Serre L" first="Laurence" last="Serre">Laurence Serre</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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