| 单词 | alpha helix |
| 释义 | > as lemmasalpha helix alpha helix n. Biochemistry one of the two common conformations of the secondary structure of proteins, in which the polypeptide chain assumes the form of a straight, tightly coiled helix, stabilized by hydrogen bonding between carbonyl and amide groups in the peptide linkages of the chain. ΚΠ 1932 W. T. Astbury in Philos. Trans. (Royal Soc.) A. 230 76 The X-ray photograph of unstretched hair is quite different from that of stretched hair. On stretching the hair, the α-photograph, as we shall call it, fades away and is gradually replaced by the β-photograph... The occurrence and progress of this transformation from the α-form to the β-form accounts readily for the main features of the characteristic load/extension curve.] 1951 L. Pauling & R. B. Corey in Proc. National Acad. Sci. U.S.A. 37 239 The α helix is a configuration of the polypeptide chain in which each amide group forms hydrogen bonds with the amide groups removed by three from it in either direction along the chain. 1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) iii. 110 Those portions of a transmembrane protein that cross the lipid bilayer are nearly always α helices. 1991 Sci. Amer. Apr. 35/1 Amino acids with different chemical properties are often segregated on the surface of alpha helices. 2003 Time 12 Feb. 51/2 Keratin [is]..a long, complex corkscrew of atoms known as alpha-helix. < as lemmas |
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