1EVW

L116A MUTANT OF THE HOMING ENDONUCLEASE I-PPOI COMPLEXED TO HOMING SITE DNA.

1EVW の概要

• エントリーDOI: 10.2210/pdb1evw/pdb
• 関連するPDBエントリー: 1A73 1CYQ 1CZ0 1EVX
• 分子名称: DNA (5'-D(*TP*GP*GP*CP*TP*AP*CP*CP*TP*TP*AP*A)-3'), DNA (5'-D(P*GP*AP*GP*AP*GP*TP*CP*A)-3'), DNA (5'-D(*TP*GP*AP*CP*TP*CP*TP*CP*TP*TP*AP*A)-3'), ... (7 entities in total)
• 機能のキーワード: dna binding b-sheets; c-terminal exchanged dimer interface; bent dna, hydrolase-dna complex, hydrolase/dna
• 由来する生物種: Physarum polycephalum; 詳細
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 96051.25

構造登録者

Galburt, E.A.,Jurica, M.S.,Chevalier, B.S.,Erho, D.,Stoddard, B.L. (登録日: 2000-04-20, 公開日: 2000-08-03, 最終更新日: 2024-02-07)

主引用文献

Galburt, E.A.,Chadsey, M.S.,Jurica, M.S.,Chevalier, B.S.,Erho, D.,Tang, W.,Monnat Jr., R.J.,Stoddard, B.L.
Conformational changes and cleavage by the homing endonuclease I-PpoI: a critical role for a leucine residue in the active site.
J.Mol.Biol., 300:877-887, 2000

PubMed Abstract: The homing endonuclease I-PpoI severely bends its DNA target, resulting in significant deformations of the minor and major groove near the scissile phosphate groups. To study the role of conformational changes within the protein catalyst and the DNA substrate, we have determined the structure of the enzyme in the absence of bound DNA, performed gel retardation analyses of DNA binding and bending, and have mutagenized a leucine residue that contacts an adenine nucleotide at the site of cleavage. The structure of the L116A/DNA complex has been determined and the effects of the mutation on affinity and catalysis have been measured. The wild-type protein displays a rigid-body rotation of its individual subunits upon DNA binding. Homing site DNA is not detectably bent in the absence of protein, but is sharply bent in both the wild-type and L116A complexes. These results indicate that binding involves a large distortion of the DNA and a smaller change in protein conformation. Leucine 116 is critical for binding and catalysis: it appears to be important for forming a well-ordered protein-DNA complex at the cleavage site, for maximal deformation of the DNA, and for desolvation of the nucleotide bases that are partially unstacked in the enzyme complex.

PubMed: 10891275
DOI: 10.1006/jmbi.2000.3874

実験手法

X-RAY DIFFRACTION (3.1 Å)