Amino acid propensities for the collagen triple-helix - PubMed (original) (raw)
Comparative Study
. 2000 Dec 5;39(48):14960-7.
doi: 10.1021/bi001560d.
Affiliations
- PMID: 11101312
- DOI: 10.1021/bi001560d
Comparative Study
Amino acid propensities for the collagen triple-helix
A V Persikov et al. Biochemistry. 2000.
Abstract
Determination of the tendencies of amino acids to form alpha-helical and beta-sheet structures has been important in clarifying stabilizing interactions, protein design, and the protein folding problem. In this study, we have determined for the first time a complete scale of amino acid propensities for another important protein motif: the collagen triple-helix conformation with its Gly-X-Y repeating sequence. Guest triplets of the form Gly-X-Hyp and Gly-Pro-Y are used to quantitate the conformational propensities of all 20 amino acids for the X and Y positions in the context of a (Gly-Pro-Hyp)(8) host peptide. The rankings for both the X and Y positions show the highly stabilizing nature of imino acids and the destabilizing effects of Gly and aromatic residues. Many residues show differing propensities in the X versus Y position, related to the nonequivalence of these positions in terms of interchain interactions and solvent exposure. The propensity of amino acids to adopt a polyproline II-like conformation plays a role in their triple-helix rankings, as shown by a moderate correlation of triple-helix propensity with frequency of occurrence in polyproline II-like regions. The high propensity of ionizable residues in the X position suggests the importance of interchain hydrogen bonding directly or through water to backbone carbonyls or hydroxyprolines. The low propensity of side chains with branching at the C(delta) in the Y position supports models suggesting these groups block solvent access to backbone C=O groups. These data provide a first step in defining sequence-dependent variations in local triple-helix stability and binding, and are important for a general understanding of side chain interactions in all proteins.
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