Download MendeleyStructural Basis for Aza-Glycine Stabilization of Collagen.
Kasznel, A.J., Zhang, Y., Hai, Y., Chenoweth, D.M.(2017) J Am Chem Soc 139: 9427-9430
- PubMed: 28650147
- DOI: https://doi.org/10.1021/jacs.7b03398
- Primary Citation of Related Structures:
5K86 - PubMed Abstract:
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 °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.
Organizational Affiliation:
Department of Chemistry and ‡Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States.
