2klw

Solution structure of an abc collagen heterotrimer reveals a single-register helix stabilized by electrostatic interactions

spinqualitylabelsall models 2klw, 15 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2klw is a 3 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: ACE, HYP, NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Collagen, known for its structural role in tissues and also for its participation in the regulation of homeostatic and pathological processes in mammals, is assembled from triple helices that can be either homotrimers or heterotrimers. High resolution structural information for natural collagens has been difficult to obtain because of their size and the heterogeneity of their native environment. For this reason, peptides that self-assemble into collagen-like triple helices are used to gain insight into the structure, stability, and biochemistry of this important protein family. Although many of the most common collagens in humans are heterotrimers, almost all studies of collagen helices have been on homotrimers. Here we report the first structure of a collagen heterotrimer. Our structure, obtained by solution NMR, highlights the role of electrostatic interactions as stabilizing factors within the triple helical folding motif. This addresses an issue that has been actively researched because of the predominance of charged residues in the collagen family. We also find that it is possible to selectively form a collagen heterotrimer with a well defined composition and register of the peptide chains within the helix, based on information encoded solely in the collagenous domain. Globular domains are implicated in determining the composition of several collagen types, but it is unclear what their role in controlling register may be. We show that is possible to design peptides that not only selectively choose a composition but also a specific register without the assistance of other protein constructs. This mechanism may be used in nature as well. Solution structure of an ABC collagen heterotrimer reveals a single-register helix stabilized by electrostatic interactions.,Fallas JA, Gauba V, Hartgerink JD J Biol Chem. 2009 Sep 25;284(39):26851-9. Epub 2009 Jul 22. PMID:19625247 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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