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Systematic variation in bond lengths of peptides
Biochimica Et Biophysica Acta
|August 28, 1981
Summary
Peptide bond lengths, including carbonyl and adjacent bonds, systematically change with the central C-N bond. Ab initio calculations explored these variations in N-methylacetamide and its metal ion complexes.
Area of Science:
- Biochemistry and computational chemistry
Background:
- Peptide bonds are fundamental in biological molecules.
- Understanding bond length variations is crucial for molecular structure analysis.
Purpose of the Study:
- To investigate the systematic variations in peptide bond lengths.
- To analyze the influence of metal ions on these bond lengths.
Main Methods:
- Performed ab initio calculations.
- Studied N-methylacetamide and its complexes with Li+, Na+, and Mg2+.
Main Results:
- Demonstrated systematic correlations between central C-N bond length and adjacent bond lengths (carbonyl, C-N, C-C).
- Observed specific effects of Li+, Na+, and Mg2+ complexation on these bond parameters.
Conclusions:
- Central C-N bond length is a key determinant of adjacent bond lengths in peptides.
- Metal ion complexation can modulate peptide bond geometry.