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• W2095400080 abstract "Abstract Many protein–protein interaction domains bind to multiple targets. However, little is known about how the interactions of a single domain with many proteins are controlled and modulated under varying cellular conditions. In this study, we investigated the in vivo effects of Abp1p SH3 domain mutants that incrementally reduce target-binding affinity in four different yeast mutant backgrounds in which Abp1p activity is essential for growth. Although the severity of the phenotypic defects observed generally increased as binding affinity was reduced, some genetic backgrounds (prk1Δ and sla1Δ) tolerated large affinity reductions while others (sac6Δ and sla2Δ) were much more sensitive to these reductions. To elucidate the mechanisms behind these observations, we determined that Ark1p is the most important Abp1p SH3 domain interactor in prk1Δ cells, but that interactions with multiple targets, including Ark1p and Scp1p, are required in the sac6Δ background. We establish that the Abp1p SH3 domain makes different, functionally important interactions under different genetic conditions, and these changes in function are reflected by changes in the binding affinity requirement of the domain. These data provide the first evidence of biological relevance for any Abp1p SH3 domain-mediated interaction. We also find that considerable reductions in binding affinity are tolerated by the cell with little effect on growth rate, even when the actin cytoskeletal morphology is significantly perturbed." @default.
• W2095400080 created "2016-06-24" @default.
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• W2095400080 date "2007-05-01" @default.
• W2095400080 modified "2023-09-25" @default.
• W2095400080 title "The Biologically Relevant Targets and Binding Affinity Requirements for the Function of the Yeast Actin-Binding Protein 1 Src-Homology 3 Domain Vary With Genetic Context" @default.
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• W2095400080 doi "https://doi.org/10.1534/genetics.106.070300" @default.
• W2095400080 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1893037" @default.
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