The role of Buergi-Dunitz interactions in the structural stability of proteins

Proteins
Christian Fufezan

Abstract

Nonbonding interactions are essential for protein stability and maintenance of secondary structure. Their strength, however, is not always experimentally accessible. One example is the stability of collagen, which is in part due to Buergi-Duntiz or n --> pi* interactions between the peptide backbone atoms [DeRider et al., J Am Chem Soc 2002;124:2497-2505]. Here, the overall frequency of n --> pi* interactions in proteins has been investigated. The analysis of a nonredundant set of protein structures showed that 45.1% of all residues have a backbone conformation favoring a n --> pi* nucleophilic attack between the carbonyl oxygen of residue i - 1 and the carbonyl carbon of residue i. These residues form a substantial fraction of right- and left-handed alpha helices, 3(10) helices, pi helices, and hydrogen bonded turns. Simulations showed that there are only four regions in Ramachandran space that favor backbone n(i-1) --> pi(i) (*) interactions and these Phi, Psi combinations are observed with high frequencies in the nonredundant protein structure set. Analysis of carbonyl carbon displacements out of the peptide plane in ultra-high resolution protein structures indeed reveals the presence of the Buergi-Dunitz trajectory. The Bue...Continue Reading

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Citations

Nov 21, 2012·The Journal of Organic Chemistry·Kimberli J KamerRonald T Raines
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