Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 50, Pages 16496-16500Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811171
Keywords
ab initio calculations; carbon bonding; noncovalent interactions; proteins; tetrel bonding
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Funding
- Department of Atomic Energy (DAE), India
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Carbon bonds (C-bonds) are the highly directional noncovalent interactions between carbonyl-oxygen acceptors and sp(3)-hybridized-carbon sigma-hole donors through n ->sigma* electron delocalization. We have shown the ubiquitous existence of C-bonds in proteins with the help of careful protein structure analysis and quantum calculations, and have precisely determined C-bond energies. The importance of conventional noncovalent interactions such as hydrogen bond (H-bonds) and halogen bond (X-bonds) in the structure and function of biological molecules are well established, while carbon bonds C-bonds have still to be recognized. We have shown that C-bonds are present in proteins, contribute enthalpically to the overall hydrophobic interaction and play a significant role in the photodissociation mechanism of myoglobin and the binding of nucleobases to proteins.
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