Entrapping unusual folding characteristics of the beta-Ala residues in a model peptide: Boc-beta-Ala-Aib-beta-Ala-NHCH3.
Crystal structure analysis of a model peptide: Boc-beta-Ala-Aib-beta-Ala-NHCH3 (beta-Ala: 3-amino propionic acid; Aib: alpha-aminoisobutyric acid) revealed distinct conformational preferences for folded [phi approximately 136 degrees, mu approximately -62 degrees, psi approximately 100 degrees] and semifolded [phi approximately 83 degrees, mu approximately -177 degrees, psi approximately -117 degrees] structures of the N-and C-terminus beta-Ala residues, respectively. The overall folded conformation is stabilized by unusual Ni...H-Ni+1 and nonconventional C-H...O intramolecular hydrogen bonding interactions.
Institute of Microbial Technology, Chandigarh, India.
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Thakur
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Venugopalan
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Kishore
D006860:Hydrogen Bonding; D015394:Molecular Structure; D009842:Oligopeptides / Q000737:chemistry*; D011487:Protein Conformation; D017510:Protein Folding; D014961:X-Ray Diffraction; D015091:beta-Alanine / Q000737:chemistry*
D009842:Oligopeptides; D015091:beta-Alanine