Weak Nonbonded S···X (X = O, N, and S) Interactions in Proteins. Statistical and Theoretical Studies.

Sulfur-containing functional groups of cystine (an SSC group) and methionine (a CSC group) are usually considered as hydrophobic moieties or weak hydrogen-bond acceptors in folded protein structures. However, database analysis as well as theoretical calculations carried out in this study have provided strong evidence for the presence of specific nonbonded interactions between the divalent sulfur atoms (S) and nearby polar non-hydrogen atoms (X). Close S···X (X = O, N, S, C, etc.) atomic contacts were statistically analyzed in 604 high-resolution heterogeneous X-ray structures selected from a protein databank (PDB_SELECT). The S···O interactions found for both SSC and CSC groups showed a specific character as a π(C=O) → σ*(S) orbital interaction based on the directional preferences. The interactions were most frequently observed in α-helices. Ab initio calculations applying the second order Moller–Plesset perturbation theory (MP2) suggested the primary importance of electron correlations. The total stabili...

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