1plo
From Proteopedia
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'''TRANSFORMING GROWTH FACTOR-BETA TYPE II RECEPTOR EXTRACELLULAR DOMAIN''' | '''TRANSFORMING GROWTH FACTOR-BETA TYPE II RECEPTOR EXTRACELLULAR DOMAIN''' | ||
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[[Category: Shu, Z.]] | [[Category: Shu, Z.]] | ||
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:13:37 2008'' | |
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Revision as of 02:13, 3 May 2008
TRANSFORMING GROWTH FACTOR-BETA TYPE II RECEPTOR EXTRACELLULAR DOMAIN
Contents |
Overview
Isoforms of transforming growth factor beta (TGFbeta) are 25 kDa homodimeric polypeptides that signal by binding and bringing together two related, functionally distinct cell surface receptors designated as TbetaR1 and TbetaR2. Here, we report the solution structure of the 13.8 kDa extracellular domain of human TbetaR2 (ecTbetaR2) as calculated from N(N)-H(N), C(alpha)-H(alpha), and C(alpha)-C(O) residual dipolar coupling restraints in conjunction with NOE distance, dihedral angle, and scalar coupling restraints. Comparison of the free ecTbetaR2 solution structure with the TGFbeta3-bound ecTbetaR2 crystal structure reveals backbone conformations that superimpose with RMSDs of 1.0 A over the regions of regular secondary structure and 1.4 A overall. The differences in structure fall mainly in loop regions that are either poorly defined by the available NMR data or are involved in crystal contacts. The noted similarities between the NMR structure of the free form and the crystal structure of the TGFbeta-bound form are also consistent with the close correspondence, 0.16 A RMSD for regions of secondary structure and 0.51 A RMSD overall, for the crystal structure of free ecTbetaR2 as compared to the crystal structure of TGFbeta3-bound ecTbetaR2. Despite the apparent similarities between the free and the bound forms, there appears to be small but significant differences in structure involving the interfacial contact region of the receptor. Measurements of backbone (15)N relaxation times and interpretation of these by the model-free formalism with axial diffusional anisotropy further reveal significant ms to micros time scale motions centered about two of the conserved disulfide bonds and in several residues that comprise the TGFbeta binding surface. Together, these observations indicate that binding likely occurs through a mechanism with a small component of induced fit character, whereby flexibility within the receptor facilitates the transition to the TGFbeta-bound state.
Disease
Known disease associated with this structure: Colorectal cancer, hereditary nonpolyposis, type 6 OMIM:[190182], Esophageal cancer OMIM:[190182], Loeys-Dietz syndrome, type 1B OMIM:[190182], Loeys-Dietz syndrome, type 2B OMIM:[190182]
About this Structure
1PLO is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Solution structure and backbone dynamics of the TGFbeta type II receptor extracellular domain., Deep S, Walker KP 3rd, Shu Z, Hinck AP, Biochemistry. 2003 Sep 2;42(34):10126-39. PMID:12939140 Page seeded by OCA on Sat May 3 05:13:37 2008
