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Titolo:
SPECIFIC RECOGNITION OF A G AND A/7,8-DIHYDRO-8-OXOGUANINE (8-OXOG) MISMATCHES BY ESCHERICHIA-COLI MUTY - REMOVAL OF THE C-TERMINAL DOMAIN PREFERENTIALLY AFFECTS A/8-OXOG RECOGNITION/
Autore:
GOGOS A; CILLO J; CLARKE ND; LU AL;
Indirizzi:
UNIV MARYLAND,SCH MED,DEPT BIOCHEM & MOL BIOL,108 N GREENE ST BALTIMORE MD 21201 UNIV MARYLAND,SCH MED,DEPT BIOCHEM & MOL BIOL BALTIMORE MD 21201 JOHNS HOPKINS UNIV,SCH MED,DEPT BIOPHYS & BIOPHYS CHEM BALTIMORE MD 21205
Titolo Testata:
Biochemistry
fascicolo: 51, volume: 35, anno: 1996,
pagine: 16665 - 16671
SICI:
0006-2960(1996)35:51<16665:SROAGA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENZYME ENDONUCLEASE-III; DNA-POLYMERASE-I; G-A MISPAIRS; BASE-PAIR; REPAIR; GENE; GLYCOSYLASE; MUTAGENESIS; PROTEIN; BINDING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
A. Gogos et al., "SPECIFIC RECOGNITION OF A G AND A/7,8-DIHYDRO-8-OXOGUANINE (8-OXOG) MISMATCHES BY ESCHERICHIA-COLI MUTY - REMOVAL OF THE C-TERMINAL DOMAIN PREFERENTIALLY AFFECTS A/8-OXOG RECOGNITION/", Biochemistry, 35(51), 1996, pp. 16665-16671

Abstract

Escherichia coli MutY is a 39 kDa adenine DNA glycosylase and 3' apurinic/apyrimidinic (AP) lyase that is active on DNA substrates containing A/G, A/C, or A/8-oxoG mismatches. 8-oxoG (7,8-dihydro-8-oxoguanine or GO) is a major stable product of oxidative damage, and A/GO mismatches may be particularly important biological substrates for MutY. Proteolytic digestion of MutY using thermolysin was found to produce two relatively stable fragments of 25 and 12 kDa. The 25 kDa fragment begins at the N terminus of MutY and spans the region homologous with E. coli endonuclease III, a DNA glycosylase/AP lyase that repairs oxidatively damaged pyrimidines. The 12 kDa fragment, which consists of much ofthe rest of MutY, had no detectable activity. The purified 25 kDa fragment (M25) had nearly wild-type binding and cleavage activities with A/G-mismatched substrates. Binding to A/GO-mismatched DNA, however, was dramatically reduced in M25 compared to that in intact protein. Borohydride-dependent enzyme-DNA cross-linking, which is a hallmark of thereaction of several DNA glycosylases that possess concomitant AP lyase activity, was also substantially reduced when M25 was allowed to react with A/GO-mismatched DNA. The significant differences in M25 recognition and reactivity with A/G and A/GO mismatches suggest that the C-terminal region of MutY, a region with no homologous counterpart in E. coli endonuclease III, plays an important role in the repair of mismatched DNA arising from oxidation damage.

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Documento generato il 30/10/20 alle ore 09:51:24