Volume 11, Issue 8, Pages (August 2003)

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Volume 11, Issue 8, Pages 905-913 (August 2003) Coupling of Folding and Binding in the PTB Domain of the Signaling Protein Shc  Amjad Farooq, Lei Zeng, Kelley S Yan, Kodi S Ravichandran, Ming-Ming Zhou  Structure  Volume 11, Issue 8, Pages 905-913 (August 2003) DOI: 10.1016/S0969-2126(03)00134-5

Figure 1 Domain Structure of Shc and the Effects of TrkA Phosphopeptide Binding on the PTB Domain (A) Alternative splicing of Shc mRNA gives rise to three distinct isoforms: p46Shc, p52Shc, and p66Shc. These differ only to the extent of their N-terminal sequence. All three isoforms contain an N-terminal phosphotyrosine binding (PTB) domain, a central collagen homology (CH) domain, and a C-terminal Src homology 2 (SH2) domain. p66Shc isoform contains an additional CH domain N-terminal to the PTB domain. The PTB domain is mapped to residues 1–207 within the p52Shc isoform. (B) A superposition of a region of 1H/15N-HSQC showing amide resonances of select residues in the Shc PTB domain (residues 1–207) in the absence (black) and presence (red) of TrkA phosphopeptide, at a protein to peptide molar ratio of 1:1. (C) A plot of the difference in the chemical shift values (Δδ) of the backbone 1HN and 15N resonances of the Shc PTB domain (residues 17–207) in the free form and complexed to TrkA phosphopeptide as a function of residue number. Δδ for each residue was calculated from the equation Δδ = [(Δδ1HN)2 + (Δδ15N/5)2]1/2, where Δδ1HN and Δδ15N are the chemical shift differences in the 1HN and the 15N resonances of the free and the complex forms, respectively, as observed in the 1H/15N-HSQC spectra of the Shc PTB domain. Structure 2003 11, 905-913DOI: (10.1016/S0969-2126(03)00134-5)

Figure 2 Comparison of NMR Structures of the Shc PTB Domain (Residues 39–200) in the Free and Complex Forms Structures of both the free and the complex forms of the PTB domain were obtained using a protein construct composed of residues 17–207. For clarity, residues 17–38 and 201–207 in the unstructured regions outside the core domain are omitted. Helices and strands are colored green and blue, respectively. The TrkA phosphopeptide is shown in yellow. (A) Stereo view of the backbone atoms (N, Cα, and C′) of 20 superimposed energy-minimized NMR-derived structures of the Shc PTB domain in the free form. (B) Two alternative ribbon plots, related by a 90° clockwise rotation about the vertical axis, of the Shc PTB domain in the free form are shown. (C) Two alternative ribbon plots, related by a 90° clockwise rotation about the vertical axis, of the Shc PTB domain complexed to TrkA phosphopeptide are shown. The orientations of the domain in (B) and (C) are similar. The structure of the Shc PTB domain in complex with TrkA phosphopeptide was obtained previously (Zhou et al., 1995b), and its atomic coordinates can be found under PDB ID code 1SHC. Structure 2003 11, 905-913DOI: (10.1016/S0969-2126(03)00134-5)

Figure 3 Comparison of the Peptide Binding Pocket in the Free and Complex Forms of the Shc PTB Domain (Residues 39–200) Key protein residues such as R67, R175, I194, and F198 in the Shc PTB domain that line the peptide binding pocket are shown. Shown are key peptide residues at positions pY(−3) and pY(−5), and pY (phosphotyrosine) in the TrkA phosphopeptide that directly interact with the protein. Also shown are close-up ribbon views of the peptide binding pocket in the free form (A) and the complex form (B), and surface potential views of the peptide binding pocket in the free form (C) and the complex form (D). Structure 2003 11, 905-913DOI: (10.1016/S0969-2126(03)00134-5)

Figure 4 Folding Funnel View of Ligand Binding to the Shc PTB Domain The vertical axis of the funnel denotes the free energy less the configurational entropy, while the horizontal axis represents the conformational freedom of the protein (indicated by the width of the wells of the funnel). (A) The free form lies at local energy minima in the absence of ligand. Ligand binding induces structural changes within the free form, allowing it to overcome the local energy barriers to reach the global fold at the bottom of the funnel. (B) The free and the complex forms coexist in the absence of ligand and are in equilibrium exchange with each other at the local energy minima in the folding funnel. Ligand binding to the complex form allows it to overcome the local energy barriers to reach the global energy minima at the bottom of the funnel, while at the same time shifts the equilibrium from the free to the complex form. Structure 2003 11, 905-913DOI: (10.1016/S0969-2126(03)00134-5)