Nucleic Acids Research, 1993, Vol. 21, No. 12 2899-2905
© 1993
MOLECULAR BIOLOGY |
Cleavage and binding of a DNA fragment containing a single 8-oxoguanine by wild type and mutant FPG proteins
Laboratoire de Biologie Structurale du CNRS 1 av. de la Terrasse, 91198-Gif sur Yvette, France 1Sektion Polymere, Universität Ulm Albert Einstein Allee 11, W-7900 Ulm 2Lab. für Molekularbiologie and Allgemeine Pathologie, Universität Ulm Neuherbergstr. 11, W-8000 Munich 45, Germany 3LA147 CNRS, U140 INSERM, Institut Gustave Roussy, Groupe Réparation des Lésions Radio- et Chimio-induites 94800-Villejuif, France
*To whom correspondence should be addressed
Received February 23, 1993. Revised May 27, 1993. Accepted May 27, 1993.
A 34-mer oligonucleotide containing a single 7,8-dihydro-8-oxoguanlne (8-OxoG) residue was used to study the enzymatic and DNA binding properties of the Fpg protein from E.coll. The highest rates of incision of the 8-OxoG containing strand by the Fpg protein were observed for duplexes where 8-OxoG was opposite C (*G/C) or T (*G/T). In contrast, the rates of incision of duplexes containing 8-OxoG opposite G (*G/G) and A (*G/A) were 5-fold and 200-fold slower. Gel retardation studies showed that the Fpg protein had a strong affinity for duplexes where the 8-OxoG was opposite pyrimidines and less affinity for duplexes where the 8-OxoG was opposite purines. Koapp values were 0.6 nM (*G/C), 1.0 nM (*G/T), 6.0 nM (*G/G) and 16.0 nM (*G/A). The Fpg protein also binds to unmodified (G/C) duplex and a KDapp of 90 nM was measured. The cleavage and binding of the (*G/C) duplex were also studied using bacterial crude lysates. Wild type E.coll crude extract incised the 8-OxoG containing strand and formed a specific retardation complex with the (*G/C) duplex. These two reactions were mediated by the Fpg protein, since they were not observed with a crude extract from a bacterial strain whose fpg gene was inactivated. Furthermore, we have studied the properties of 6 mutant Fpg proteins with Cys
Gly mutations. The results showed that the 2 Fpg proteins with Cys
Gly mutations outside the zinc finger sequence cleaved the 8-OxoG containing strand, formed complexes with the (*G/C) duplex and suppressed the mutator phenotype of the fpg-1 mutant. In contrast, the 4 Fpg proteins with Cys
Gly mutations within the zinc finger motif neither cleave nor bind the (*G/C) duplex, nor do these proteins suppress the fpg-1 mutator phenotype.
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