Involvement of helicase II (uvrD gene product) and DNA polymerase I in excision mediated by the uvrABC protein complex

Journal Article · Thu Aug 01 00:00:00 EDT 1985 · Proc. Natl. Acad. Sci. U.S.A.; (United States)

DOI:https://doi.org/10.1073/pnas.82.15.4925· OSTI ID:5017753

Caron, P R; Kushner, S R; Grossman, L

The bimodal-incision nature of the reaction of UV-irradiated DNA catalyzed by the Escherichia coli uvrABC protein complex potentially leads to excision of a 12- to 13-nucleotide-long damaged fragment. However, the oligonucleotide fragment containing the UV-induced pyrimidine dimer is not released under nondenaturing in vitro reaction conditions. Also, the uvrABC proteins are stably bound to the incised DNA and do not turn over after the incision event. In this communication it is shown that release of the damaged fragment from the parental uvrABC-incised DNA is dependent upon either chelating conditions or the simultaneous addition of the uvrD gene product (helicase II) and the polA gene product (DNA polymerase I) when polymerization of deoxynucleoside triphosphate substrates is concomitantly catalyzed. The product of this multiprotein-catalyzed series of reactions serves as a substrate for polynucleotide ligase, resulting in the restoration of the integrity of the strands of DNA. The addition of the uvrD protein to the incised DNA-uvrABC complex also results in turnover of the uvrC protein. It is suggested that the repair processes of incision, excision, resynthesis, and ligation are coordinately catalyzed by a complex of proteins in a ''repairosome'' configuration.

• Research Organization: Johns Hopkins Univ., Baltimore, MD
• OSTI ID: 5017753
• Journal Information: Proc. Natl. Acad. Sci. U.S.A.; (United States), Vol. 15
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
DNA
GENETIC RADIATION EFFECTS
DNA POLYMERASES
ENZYME ACTIVITY
LIGASES
CATALYSTS
DNA REPAIR
ESCHERICHIA COLI
GENES
NUCLEOTIDES
POLYMERIZATION
PROTEINS
PYRIMIDINE DIMERS
SUBSTRATES
ULTRAVIOLET RADIATION
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ENZYMES
GENETIC EFFECTS
MICROORGANISMS
NUCLEIC ACIDS
NUCLEOTIDYLTRANSFERASES
ORGANIC COMPOUNDS
PHOSPHORUS-GROUP TRANSFERASES
POLYMERASES
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
TRANSFERASES
560111* - Radiation Effects on Biochemicals- In Vitro- (-1987)