Searching for the simplest structural units to describe the three-dimensional structure of proteins
作者:
András Perczel,
ImreG. Csizmadia,
期刊:
International Reviews in Physical Chemistry
(Taylor Available online 1995)
卷期:
Volume 14,
issue 1
页码: 127-168
ISSN:0144-235X
年代: 1995
DOI:10.1080/01442359509353307
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Ab initiocomputations have been carried out during the past several years on diamides of single amino acids (HCO-NHCHR-CONH2whereR=H (glycine), -CH3(alanine), -CH(CH3)2(valine) and -CH2OH (serine)) exploring all possible backbone and side chain conformations. Selected conformations were studied in our laboratory on threonine (R=CH(CH3)OH), cystein (R=CH2-SH) and phenyl-alanine (R=CH2-CH5H6) diamides. Tri-, tetra-, penta-, hexa- and hepta-amide systems of poly-L-alanine (H-(CONH-CHCH3-CONH)n-H 2⩽n⩽6) were also investigated at selected backbone conformations. All these studies confirmed the results of multidimensional conformation analyses: thejth amino acid residue in a polypeptide has a maximum of nine (9) discrete backbone conformations. These structures correspond to nine conformational centres on the 2D-Ramachandran map. On the basis of this rinding, it can be shown that the folded secondary structure of any protein with known internal coordinates, can be described in terms of these nine discrete conformation types.
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