Sterically allowed forms of the poly-N-methyl-calanine chain were found by calculation of conformational energies as a function of the rotation angles of its chain bonds. The lowest energy form seems to be a right-handed, approximately threefold helix.
On the conformations of poly-N-methyl-L-alanine (PNMA) in solution
β Scribed by F. Conti; P. De Santis
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1971
- Tongue
- English
- Weight
- 380 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0006-3525
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β¦ Synopsis
High-resolution nuclear magnetic resonance spectra at 100 MHz have been obtained on poly-iV-methyl-L-alanine in the chloroform-trifluoroacetic acid system under various conditions of solvent composition. Different spectra are observed for the CH,-C,, C,-H, and N-CHI protons. On the basis of conformational analysis an interpretation of the NMR results was attempted.
π SIMILAR VOLUMES
Conformational energies of the poly-N-methyl-halanine chain have been calculated as a function of the rotational angles of its skeletal bonds, taking into account torsional potentials, van der Waals repulsions, and London attractions. Four pronounced minima in the energy were found; the relative mag
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The infrared absorption of poly-L-proline in concentrated aqueous salt solutions was measured in the fundanierital region. Of primary interest were the carbonyl absorption of the peptide linkage and the methylene C-H bending absorption of the pyrrolidine ring. These spectral regions each show an add
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