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Evelyn Witkin hypothesized in 1967 that bacterial cell division is controlled by a repressor which, like the lambda repressor, is inactivated by a complex process that starts with the presence of replication-blocking lesions in the DNA. She further suggested that this might not be the only...
DNA double-strand breaks (DSBs) in yeast are repaired by homologous recombination (HR) and non-homologous end-joining (NHEJ). Rad51 forms nucleoprotein filaments at processed broken ends that effect strand exchange, forming heteroduplex DNA (hDNA) that gives rise to a gene conversion tract. We...
We have shown previously that endonuclease III from Escherichia coli , its yeast homolog Ntg1p and E. coli endonuclease VIII recognize single dihydrouracil (DHU) lesions efficiently. However, these enzymes have limited capacities for completely removing DHU, when the lesion is present on duplex...
The first US-Japan meeting on “error-prone DNA synthesis” convened at the Maui Prince Hotel, from December 20 through December 21, 2004. In keeping with the traditions of US-Japan conferences, the meeting was small and intimate, and comprised of 22 participants: 11 from Japan, 10 from the...
Telomerase-immortalized lines of diploid xeroderma pigmentosum variant (XP-V) fibroblasts (XP115LO and XP4BE) were complemented for constitutive or regulated expression of wild-type human DNA polymerase eta (hpol eta). The ectopic gene was expressed from a retroviral LTR at a population average...
Genetic and biochemical studies of mammalian DNA ligase I indicate that this multifunctional enzyme plays a key role in the completion of DNA replication and certain DNA excision repair pathways. However, the involvement of DNA ligase I in DNA double-strand break repair has not been examined....
UvrB is the ultimate damage-binding protein in bacterial nucleotide excision repair. Previous AFM experiments have indicated that UvrB binds to a damage as a dimer. In this paper we visualize for the first time a UvrB dimer in a gel retardation assay, with the second subunit (B2) more loosely...
RecA protein plays a central role in homologous recombination and DNA repair. RecX , a gene directly downstream in Escherichia coli and some other bacterial species, down regulates it. However, the precise mechanism of regulation of RecA by RecX is not known. In order to study the function of...
The Saccharomyces cerevisiae mutant strain YW778, which lacks apurinic/apyrimidinic (AP) endonuclease and 3′-diesterase DNA repair activities, displays high levels of spontaneous mutations and hypersensitivities to several DNA damaging agents. We searched a cDNA library derived from the...
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