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• W1966144080 abstract "SH3 (src homology domain 3) domains are small protein modules that interact with proline-rich peptides. The structure of the N-terminal SH3 domain from growth factor receptor-binding protein 2 (Grb2), an adapter protein in the intracellular signaling pathway to Ras, was investigated by circular dichroic (CD) spectroscopy. The compact native β-barrel conformation, previously elucidated by NMR spectroscopy, was largely predominant at pH = 4.8, in the absence of salt. From the structural changes induced by varying pH, ionic strength, temperature, or hydrophobicity of the environment, evidence for the existence of distinct nonnative conformations was obtained in the far- and near-UV domains. Along the free energy scale, these appear to distribute into two conformational ensembles, depending on the extent of structural and thermodynamic differences compared to the native conformation. The first ensemble consists of non-native conformations with a nativelike secondary structure, and the second is composed of partially unfolded conformations having short α-helical fragments or turnlike motifs in their nonnative secondary structure. Most of the observed nonnative conformations exist in mild or nondenaturing conditions. They probably have distinct compactness of their inner structure, depending on the strength of nonlocal interactions, but only the native all-β conformation possesses a condensed protein exterior, appropriate for the binding to the VPPPVPPRRR decapeptide from Sos. Upon binding, the native conformation undergoes a local tertiary structure change in a hydrophobic pocket at the binding site. This is accompanied by the PP-II helix folding of the proline-rich peptide. Interestingly, in the near-UV domain, a significant change in the spectral contribution of an aromatic exciton was observed, thus allowing quantitative tracking of the binding process." @default.
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• W1966144080 date "2000-06-08" @default.
• W1966144080 modified "2023-09-30" @default.
• W1966144080 title "Circular Dichroic Investigation of the Native and Non-native Conformational States of the Growth Factor Receptor-Binding Protein 2 N-Terminal <i>src</i> Homology Domain 3: Effect of Binding to a Proline-rich Peptide from Guanine Nucleotide Exchange Factor" @default.
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• W1966144080 doi "https://doi.org/10.1021/bi9929103" @default.
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