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Issue 9, 2019
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A conformation-specific IR spectroscopic signature for weak C[double bond, length as m-dash]O⋯C[double bond, length as m-dash]O n→π* interaction in capped 4R-hydroxyproline

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Abstract

Collagen, the most abundant protein in animals, has a unique triple helical structure comprising three parallel left-handed polyproline II (PPII) strands while each of the strands consists of a repeating sequence of X–Y–Gly, where X = proline (Pro) and Y = 4-hydroxyproline (Hyp). Collagen forms a stable triple helix of very long polypeptide strands despite the absence of intra-strand hydrogen bonding in the individual polypeptide chains. It has been reported that non-covalent n→π* interaction plays a significant role in stabilizing the individual polypeptide strands in collagen. However, there is no direct spectroscopic evidence for the presence of this interaction in collagen or its building block. Herein, we have observed for the first time a conformation-specific IR spectroscopic signature for C[double bond, length as m-dash]O⋯C[double bond, length as m-dash]O n→π*-amide interaction in a capped Hyp residue, the most important monomer building block of collagen, using isolated gas phase IR spectroscopy and quantum chemistry calculations. The proof of the existence of this interaction in a model monomer has implications for better understanding of its role not only in structures of collagen but also most of the other proteins and larger peptides.

Graphical abstract: A conformation-specific IR spectroscopic signature for weak C [[double bond, length as m-dash]] O⋯C [[double bond, length as m-dash]] O n→π* interaction in capped 4R-hydroxyproline

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Article information


Submitted
14 Dec 2018
Accepted
04 Feb 2019
First published
04 Feb 2019

Phys. Chem. Chem. Phys., 2019,21, 4755-4762
Article type
Paper

A conformation-specific IR spectroscopic signature for weak C[double bond, length as m-dash]O⋯C[double bond, length as m-dash]O n→π* interaction in capped 4R-hydroxyproline

S. K. Singh, S. More, S. Kumar, K. K. Mishra, K. N. Ganesh and A. Das, Phys. Chem. Chem. Phys., 2019, 21, 4755
DOI: 10.1039/C8CP07660J

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