5k86

Aza-glycine containing collagen peptide

spinqualitylabelsall models 5k86, resolution 1.13Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5k86 is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: HYP, NH2, XZA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Previously, we have demonstrated that replacement of the strictly conserved glycine in collagen with aza-glycine provides a general solution for stabilizing triple helical collagen peptides (Chenoweth, D. M.; et al. J. Am. Chem. Soc. 2016, 138, 9751 ; 2015, 137, 12422 ). The additional hydrogen bond and conformational constraints provided by aza-glycine increases the thermal stability and rate of folding in collagen peptides composed of Pro-Hyp-Gly triplet repeats, allowing for truncation to the smallest self-assembling peptide systems observed to date. Here we show that aza-glycine substitution enhances the stability of an arginine-containing collagen peptide and provide a structural basis for this stabilization with an atomic resolution crystal structure. These results demonstrate that a single nitrogen atom substitution for a glycine alpha-carbon increases the peptide's triple helix melting temperature by 8.6 degrees C. Furthermore, we provide the first structural basis for stabilization of triple helical collagen peptides containing aza-glycine and we demonstrate that minimal alteration to the peptide backbone conformation occurs with aza-glycine incorporation. Structural Basis for Aza-Glycine Stabilization of Collagen.,Kasznel AJ, Zhang Y, Hai Y, Chenoweth DM J Am Chem Soc. 2017 Jul 19;139(28):9427-9430. doi: 10.1021/jacs.7b03398. Epub, 2017 Jul 6. PMID:28650147 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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