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- W2024444779 abstract "Vinculin is a highly conserved cytoskeletal protein that localizes to sites of cell adhesion. The tail domain of vinculin (Vt) forms tight autoinhibitory interactions with the head domain and down-regulates vinculin function by obscuring ligand binding sites. Ligand binding is required for both vinculin activation and function, and one of vinculin's primary roles as a cell adhesion protein involves its ability to link the Actin cytoskeleton to the cell membrane. Vt can bind F-Actin and phosphoinositol 4,5-bisphosphate, and association with these ligands has been reported to cause a conformational change in Vt. Moreover, a single histidine residue, H906, was reported to be critical for both a pH dependent conformational change and pH dependent self-association. In this study, we investigate the role of pH on Vt structure and self-association. In contrast to earlier observations, our studies do not support a significant alteration in Vt conformation over this pH range. Moreover, while we identify a site of Vt dimerization, similar to that observed previously by X-ray crystallography, the weak K(d) (approximately 300 microM) determined for Vt self-association does not differ significantly between pH 5.5 and pH 7.5." @default.
- W2024444779 created "2016-06-24" @default.
- W2024444779 creator A5000739123 @default.
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- W2024444779 date "2008-11-04" @default.
- W2024444779 modified "2023-09-26" @default.
- W2024444779 title "Vinculin Tail Conformation and Self-Association Is Independent of pH and H906 Protonation" @default.
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- W2024444779 doi "https://doi.org/10.1021/bi801764a" @default.
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