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Hydrophobic Moieties Bestow Fast-Folding and Hyperstability on Collagen Triple Helices

Author:
Egli, Jasmine, Siebler, Christiane, Köhler, Martin, Zenobi, Renato, Wennemers, Helma
Source:
Journal of the American Chemical Society 2019 v.141 no.14 pp. 5607-5611
ISSN:
1520-5126
Subject:
appendages, cis-trans isomerism, collagen, denaturation, hydrophobicity, mammals, models, moieties, peptides
Abstract:
Trans amide bonds and fast cis–trans isomerization of Xaa-Pro bonds are crucial for the stability and folding rate of collagen, the most abundant protein in mammals. Here, we explored the effect of pendant hydrophobic moieties on the folding and stability of collagen triple helices. Kinetic studies with a series of collagen model peptides showed that a local hydrophobic environment accelerates cis–trans isomerization to an extent that thermally induced unfolding and folding of the collagen triple helix take place at the same speed. Thermal denaturation studies revealed that the hydrophobic appendages provide hyperstable collagen triple helices (Tₘ = 70 °C).
Agid:
6368038