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- W2073754966 abstract "The molecular and crystal structures of the C alpha-tetrasubstituted, delta-branched alpha-amino acid C alpha-methylhomophenylalanine, H-D-(alpha Me)Hph-OH, and three peptides (to the pentamer level), including the homotripeptide, have been determined by X-ray diffraction. The peptides are Z-L-(alpha Me)Hph-(L-Ala)2-OMe pBrBz-[D-(alpha Me)Hph]3-OtBu and Ac-(Aib)2-L-(alpha Me)Hph-(Aib)2-OtBu. All the (alpha Me)Hph residues prefer phi, psi torsion angles in the helical region of the conformational map. The two terminally blocked tripeptides adopt a beta-bend conformation stabilized by a 1<--4 C = O... H-N intramolecular H-bond. The terminally blocked pentapeptide is folded in a regular 3(10)-helix. In general, the relationship between (alpha Me)Hph alpha-carbon chirality and helix handedness is the same as that exhibited by protein amino acids. A comparison is also made with the conclusions extracted from published work on peptides from other types of C alpha-alkylated aromatic alpha-amino acids." @default.
- W2073754966 created "2016-06-24" @default.
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- W2073754966 date "2009-01-12" @default.
- W2073754966 modified "2023-09-23" @default.
- W2073754966 title "Structural versatility of peptides from Cα,α-disubstituted glycines: crystal-state conformational analysis of peptides from Cα-methylhomophenylalanine, (αMe)Hph" @default.
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- W2073754966 doi "https://doi.org/10.1111/j.1399-3011.1996.tb01100.x" @default.
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