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Crystal structure of the α-helical undecapeptide Boc-L-Ala-Aib-Ala-Aib-Ala-Glu(OBzl)-Ala-Aib-Ala-Aib-Ala-OMe by R. Bosch; G. Jung; H. Schmitt; W. Winter is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.
What is Crystal structure of the α-helical undecapeptide Boc-L-Ala-Aib-Ala-Aib-Ala-Glu(OBzl)-Ala-Aib-Ala-Aib-Ala-OMe about?
## Abstract The x‐ray structure of Boc‐L‐Ala‐Aib‐Ala‐Aib‐Ala‐Glu(OBzl)‐Ala‐Aib‐Ala‐Aib‐Ala‐OMe(I) represents the first α‐helix determined by direct methods. This undecapeptide is a model of the N‐terminus of alamethicin, and it exhibits voltage‐dependent pores in bilayer membranes at a higher voltage and concentration than alamethicin. The molecule crystallizes in the monoclinic space group __P__2~1~ with __a__ = 10.602(1), __b__ = 23.884(3), __c__ = 13.622(1) Å, β = 95.61(6)°, and __Z__ = 2. It adopts a right‐handed α‐helical conformation in the solid state with intramolecular 5 → 1 hydrogen bonds. An additional intramolecular hydrogen bond is bifurcated, forming a stronger 4 → 1 interaction (i.e., a β‐turn III) and a weaker 5 → 1 interaction, thus prolonging the α‐helical part up to 9 residues. The α‐helix radius of 2.1 Å, the height per residue (distance N~__i__~ ... N~__i__ + 4~) of 1.53 Å, the resulting length of the α‐helical part of 13.8 Å (9 residues) resp. 15.3 Å (10 residues), the van der Waals radius (4.7 Å), and the minimal diameter of pores formed by aggregation of 3–10 α‐helices were calculated omitting the Glu(OBzl) side chain. In the crystal, the α‐helices are linke
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- Author
- R. Bosch; G. Jung; H. Schmitt; W. Winter
- Publisher
- Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0006-3525)
- Published
- 1985
- Language
- EN
- Field
- Biochemistry, Genetics and Molecular Biology (Life Sciences)