Structural and Functional Interaction between the Human DNA Repair Proteins DNA Ligase IV and XRCC4
نویسندگان
چکیده
منابع مشابه
Loss of DNA ligase IV prevents recognition of DNA by double-strand break repair proteins XRCC4 and XLF
The repair of DNA double-strand breaks by nonhomologous end-joining (NHEJ) is essential for maintenance of genomic integrity and cell viability. Central to the molecular mechanism of NHEJ is DNA ligase IV/XRCC4/XLF complex, which rejoins the DNA. During adenovirus (Ad5) infection, ligase IV is targeted for degradation in a process that requires expression of the viral E1B 55k and E4 34k protein...
متن کاملMammalian DNA double-strand break repair protein XRCC4 interacts with DNA ligase IV
BACKGROUND Mammalian cells deficient in the XRCC4 DNA repair protein are impaired in DNA double-strand break repair and are consequently hypersensitive to ionising radiation. These cells are also defective in site-specific V(D)J recombination, a process that generates the diversity of antigen receptor genes in the developing immune system. These features are shared by cells lacking components o...
متن کاملXrcc4 physically links DNA end processing by polynucleotide kinase to DNA ligation by DNA ligase IV.
Nonhomologous end joining (NHEJ) is the major DNA double-strand break (DSB) repair pathway in mammalian cells. A critical step in this process is DNA ligation, involving the Xrcc4-DNA ligase IV complex. DNA end processing is often a prerequisite for ligation, but the coordination of these events is poorly understood. We show that polynucleotide kinase (PNK), with its ability to process ionizing...
متن کاملXRCC4:DNA ligase IV can ligate incompatible DNA ends and can ligate across gaps.
XRCC4 and DNA ligase IV form a complex that is essential for the repair of all double-strand DNA breaks by the nonhomologous DNA end joining pathway in eukaryotes. We find here that human XRCC4:DNA ligase IV can ligate two double-strand DNA ends that have fully incompatible short 3' overhang configurations with no potential for base pairing. Moreover, at DNA ends that share 1-4 annealed base pa...
متن کاملStructural and functional characterization of the PNKP–XRCC4–LigIV DNA repair complex
Non-homologous end joining (NHEJ) repairs DNA double strand breaks in non-cycling eukaryotic cells. NHEJ relies on polynucleotide kinase/phosphatase (PNKP), which generates 5΄-phosphate/3΄-hydroxyl DNA termini that are critical for ligation by the NHEJ DNA ligase, LigIV. PNKP and LigIV require the NHEJ scaffolding protein, XRCC4. The PNKP FHA domain binds to the CK2-phosphorylated XRCC4 C-termi...
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ژورنال
عنوان ژورنال: Molecular and Cellular Biology
سال: 2009
ISSN: 0270-7306,1098-5549
DOI: 10.1128/mcb.01895-08