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• W2017124286 abstract "In the mitogen activated protein kinase (MAPK) cascades of budding yeast, the scaffold protein Ste5 is recruited to the plasma membrane to transmit pheromone induced signal. A region or domain of Ste5 i.e. residues P44-R67, referred here as Ste5PM24, has been known to be involved in direct interactions with the membrane. In order to gain structural insights into membrane interactions of Ste5, here, we have investigated structures and interactions of two synthetic peptide fragments of Ste5, Ste5PM24, and a hyperactive mutant, Ste5PM24LM, by NMR, ITC, and fluorescence spectroscopy, with lipid membranes. We observed that Ste5PM24 predominantly interacted only with the anionic lipid vesicles. By contrast, Ste5PM24LM exhibited binding with negatively charged as well as zwitterionic or mixed lipid vesicles. Binding of Ste5 peptides with the negatively charged lipid vesicles were primarily driven by hydrophobic interactions. NMR studies revealed that Ste5PM24 assumes dynamic or transient conformations in zwitterionic dodecylphosphocholine (DPC) micelles. By contrast, NMR structure, obtained in anionic sodium dodecyl sulphate (SDS), demonstrated amphipathic helical conformations for the central segment of Ste5PM24. The hydrophobic surface of the helix was found to be buried inside the micelles. Taken together, these results provide important insights toward the structure and specificity determinants of the scaffold protein interactions with the plasma membrane." @default.
• W2017124286 created "2016-06-24" @default.
• W2017124286 creator A5013251288 @default.
• W2017124286 creator A5031590221 @default.
• W2017124286 creator A5087297069 @default.
• W2017124286 date "2012-05-01" @default.
• W2017124286 modified "2023-09-27" @default.
• W2017124286 title "Structural determinants of the specificity of a membrane binding domain of the scaffold protein Ste5 of budding yeast: Implications in signaling by the scaffold protein in MAPK pathway" @default.
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• W2017124286 doi "https://doi.org/10.1016/j.bbamem.2012.01.008" @default.
• W2017124286 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22285780" @default.
• W2017124286 hasPublicationYear "2012" @default.
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