Helix induction potential of N-terminal α-methyl, α-amino acids
ABSTRACT A series of longer analogues of the C-peptide of RNAse A has been synthesized with the aim of assessing the helix induction potential in water of -methyl, -amino acids at the N-terminus of the chain. The circular dichroism data indicate that one isovaline residue is effective in increasing the helix content of the 13-residue peptide by about 7%.
- Journal of Organic Chemistry - J ORG CHEM. 04/2002; 60(2).
- Biochemistry 11/1969; 8(10):4108-16. · 3.38 Impact Factor
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ABSTRACT: The structural preferences of peptides (and depsipeptides) from the achiral MeAib and Hib residues, and the chiral Iva, (alpha Me) Val, (alpha Me) Leu, and (alpha Me) Phe residues, as determined by conformational energy computations, x-ray diffraction analyses, and 1H-nmr and spectroscopic studies, are reviewed and compared with literature data on Aib-containing peptides. The results obtained indicate that helical structures are preferentially adopted by peptides rich in these alpha-amino acids methylated at the alpha-carbon. Intriguing experimental findings on the impact of the chirality of Iva, (alpha Me) Val, and (alpha Me) Phe residues on helix screw sense are illustrated.Biopolymers 08/1993; 33(7):1061-72. · 2.88 Impact Factor