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- W2118869441 abstract "Members of the ADP-ribosylation factor (Arf) family of small GTPases are implicated in vesicle traffic in the secretory pathway, although their precise function remains unclear. We generated a series of 23 clustered charge-to-alanine mutations in the Arf1 protein of Saccharomyces cerevisiae to determine the portions of this protein important for its function in cells. These mutants display a number of phenotypes, including conditional lethality at high or low temperature, defects in glycosylation of invertase, dominant lethality, fluoride sensitivity, and synthetic lethality with the arf2 null mutation. All mutations were mapped onto the available crystal structures for Arf1p: Arf1p bound to GDP, to GTP, and complexed with the regulatory proteins ArfGEF and ArfGAP. From this systematic structure-function analysis we demonstrate that all essential mutations studied map to one hemisphere of the protein and provide strong evidence in support of the proposed ArfGEF contact site on Arf1p but minimal evidence in support of the proposed ArfGAP-binding site. In addition, we describe the isolation of a spatially distant intragenic suppressor of a dominant lethal mutation in the guanine nucleotide-binding region of Arf1p." @default.
- W2118869441 created "2016-06-24" @default.
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- W2118869441 creator A5041641025 @default.
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- W2118869441 date "2002-05-01" @default.
- W2118869441 modified "2023-09-25" @default.
- W2118869441 title "Systematic Structure-Function Analysis of the Small GTPase Arf1 in Yeast" @default.
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- W2118869441 doi "https://doi.org/10.1091/mbc.02-01-0007" @default.
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