2OXV

Structure of the A138T promiscuous mutant of the EcoRI restriction endonuclease bound to its cognate recognition site.

2OXV の概要

• エントリーDOI: 10.2210/pdb2oxv/pdb
• 分子名称: DNA (5'-D(*TP*CP*GP*CP*GP*AP*AP*TP*TP*CP*GP*CP*G)-3'), Type II restriction enzyme EcoRI (3 entities in total)
• 機能のキーワード: ecori, type ii restriction endonuclease, protein-dna interactions, promiscuous mutant, relaxed specificity mutant, hydrolase-dna complex, hydrolase/dna
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 35098.99

構造登録者

Sapienza, P.J.,Rosenberg, J.M.,Jen-Jacobson, L. (登録日: 2007-02-21, 公開日: 2007-10-23, 最終更新日: 2023-08-30)

主引用文献

Sapienza, P.J.,Rosenberg, J.M.,Jen-Jacobson, L.
Structural and thermodynamic basis for enhanced DNA binding by a promiscuous mutant EcoRI endonuclease.
Structure, 15:1368-1382, 2007

PubMed Abstract: Promiscuous mutant EcoRI endonucleases bind to the canonical site GAATTC more tightly than does the wild-type endonuclease, yet cleave variant (EcoRI(*)) sites more rapidly than does wild-type. The crystal structure of the A138T promiscuous mutant homodimer in complex with a GAATTC site is nearly identical to that of the wild-type complex, except that the Thr138 side chains make packing interactions with bases in the 5'-flanking regions outside the recognition hexanucleotide while excluding two bound water molecules seen in the wild-type complex. Molecular dynamics simulations confirm exclusion of these waters. The structure and simulations suggest possible reasons why binding of the A138T protein to the GAATTC site has DeltaS degrees more favorable and DeltaH degrees less favorable than for wild-type endonuclease binding. The interactions of Thr138 with flanking bases may permit A138T, unlike wild-type enzyme, to form complexes with EcoRI(*) sites that structurally resemble the specific wild-type complex with GAATTC.

PubMed: 17997963
DOI: 10.1016/j.str.2007.09.014

実験手法

X-RAY DIFFRACTION (1.95 Å)