Aromatic-backbone interactions in alpha-helices

Article Abstract:

The interaction between the aromatic ring of an amino acid and the aplha-helical polypeptide backbone was investigated by studying the conformation of alpha-helical A/a based model peptides, with Tyr replacement in the N-terminal and inner helical positions, using (super 1)H NMR, molecular dynamics (MD) simulations, and a protein database search. Results indicate that aromatic backbone interactions commonly occur in helical structure in proteins.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Aromatic Acids, Aromatic Acids & Derivatives, Analysis, Polypeptides, Chemistry, Physical and theoretical, Physical chemistry, Amino acids

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Influence of tyrosine on the electronic circular dichroism of helical peptides

Article Abstract:

Static models of alanine-based alpha-helical peptides with tyrosine side chains are also built to predict the effect of tyrosine on circular dichroism (CD) is investigated. Comparative calculations of the CD spectra with and without parameters for the electronic transitions associated with tyrosine, for the purpose of investigating the influence of the tyrosine residue on the CD.

Influence, Peptides, Electrochemistry, Tyrosine

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Electronic circular dichroism of proteins from first-principles calculations

Article Abstract:

Rotational strengths of 47 proteins was calculated using the matrix method. This method yields calculated spectra that agrees reasonably well with experimental data.

Methods, Proteins, Spectra

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