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- W2129225238 abstract "Abstract SGS1 in yeast encodes a DNA helicase with homology to the human BLM and WRN proteins. This group of proteins is characterized by a highly conserved DNA helicase domain homologous to Escherichia coli RecQ and a large N-terminal domain of unknown function. To determine the role of these domains in SGS1 function, we constructed a series of truncation and helicase-defective (-hd) alleles and examined their ability to complement several sgs1 phenotypes. Certain SGS1 alleles showed distinct phenotypes: sgs1-hd failed to complement the MMS hypersensitivity and hyper-recombination phenotypes, but partially complemented the slow-growth suppression of top3 sgs1 strains and the top1 sgs1 growth defect. Unexpectedly, an allele that encodes the amino terminus alone showed essentially complete complementation of the hyper-recombination and top1 sgs1 defects. In contrast, an allele encoding the helicase domain alone was unable to complement any sgs1 phenotype. Small truncations of the N terminus resulted in hyperrecombination and slow-growth phenotypes in excess of the null allele. These hypermorphic phenotypes could be relieved by deleting more of the N terminus, or in some cases, by a point mutation in the helicase domain. Intragenic complementation experiments demonstrate that both the amino terminus and the DNA helicase are required for full SGS1 function. We conclude that the amino terminus of Sgs1 has an essential role in SGS1 function, distinct from that of the DNA helicase, with which it genetically interacts." @default.
- W2129225238 created "2016-06-24" @default.
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- W2129225238 date "2000-03-01" @default.
- W2129225238 modified "2023-09-25" @default.
- W2129225238 title "Bipartite Structure of the SGS1 DNA Helicase in Saccharomyces cerevisiae" @default.
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- W2129225238 doi "https://doi.org/10.1093/genetics/154.3.1101" @default.
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