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Titolo:
A single nuclease active site of the Escherichia coli RecBCD enzyme catalyzes single-stranded DNA degradation in both directions
Autore:
Wang, JD; Chen, RW; Julin, DA;
Indirizzi:
Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 & Biochem, College Pk, MD 20742 USA Univ Maryland, Cell & Mol Biol Program, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 l Program, College Pk, MD 20742 USA
Titolo Testata:
JOURNAL OF BIOLOGICAL CHEMISTRY
fascicolo: 1, volume: 275, anno: 2000,
pagine: 507 - 513
SICI:
0021-9258(20000107)275:1<507:ASNASO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPLETE NUCLEOTIDE-SEQUENCE; II RESTRICTION ENDONUCLEASES; RECOMBINATION HOTSPOT-CHI; CONSERVED LYSINE RESIDUE; ATP-BINDING SEQUENCE; RECD SUBUNIT; EXONUCLEASE-V; HOMOLOGOUS RECOMBINATION; BACTERIOPHAGE-LAMBDA; HELICASE ACTIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Julin, DA Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 College Pk, MD 20742 USA
Citazione:
J.D. Wang et al., "A single nuclease active site of the Escherichia coli RecBCD enzyme catalyzes single-stranded DNA degradation in both directions", J BIOL CHEM, 275(1), 2000, pp. 507-513

Abstract

The RecBCD enzyme of Escherichia coli is an ATP-dependent DNA exonuclease and a helicase. Its exonuclease activity is subject to regulation by an octameric nucleotide sequence called chi. In this study, site-directed mutations were made in the carboxyl-terminal nuclease domain of the RecB subunit,,and their effects on RecB-CD's enzymatic activities were investigated. Mutation of two amino acid residues, Asp(1067) and Lys(1082), abolished nuclease activity on both single- and double-stranded DNA. Together with Asp(1080), these residues compose a motif that is similar to one shown to form the active site of several restriction endonucleases. The nuclease reactions catalyzed by the RecBCD enzyme should therefore follow the same mechanism as these restriction endonucleases. Furthermore, the mutant enzymes were unable to produce chi-specific fragments that are thought to result from the 3'-5' and 5'-3' single-stranded exonuclease activities of the enzyme during its reaction with chi-containing double-stranded DNA. The results show that the nuclease active site in the RecB C-terminal 30-kDa domain is the universal nuclease active site of RecBCD that is responsible for DNA degradation in both directions during the reaction with double-stranded DNA, A novel explanation for the observed nuclease polarity switch and RecBCD-DNA interaction is offered.

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Documento generato il 05/04/20 alle ore 06:57:56