217L

STRUCTURAL BASIS OF ALPHA-HELIX PROPENSITY AT TWO SITES IN T4 LYSOZYME

217L の概要

• エントリーDOI: 10.2210/pdb217l/pdb
• 分子名称: T4 LYSOZYME, CHLORIDE ION, BETA-MERCAPTOETHANOL, ... (4 entities in total)
• 機能のキーワード: hydrolase(o-glycosyl)
• 由来する生物種: Enterobacteria phage T4
• 細胞内の位置: Host cytoplasm : P00720
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 18940.25

構造登録者

Blaber, M.,Matthews, B.W. (登録日: 1993-04-27, 公開日: 1993-10-31, 最終更新日: 2024-02-14)

主引用文献

Blaber, M.,Zhang, X.J.,Matthews, B.W.
Structural basis of amino acid alpha helix propensity.
Science, 260:1637-1640, 1993

PubMed Abstract: The propensity of an amino acid to form an alpha helix in a protein was determined by multiple amino substitutions at positions 44 and 131 in T4 lysozyme. These positions are solvent-exposed sites within the alpha helices that comprise, respectively, residues 39 to 50 and 126 to 134. Except for two acidic substitutions that may be involved in salt bridges, the changes in stability at the two sites agree well. The stability values also agree with those observed for corresponding amino acid substitutions in some model peptides. Thus, helix propensity values derived from model peptides can be applicable to proteins. Among the 20 naturally occurring amino acids, proline, glycine, and alanine each have a structurally unique feature that helps to explain their low or high helix propensities. For the remaining 17 amino acids, it appears that the side chain hydrophobic surface buried against the side of the helix contributes substantially to alpha helix propensity.

PubMed: 8503008

実験手法

X-RAY DIFFRACTION (1.7 Å)