IN THE INHIBITOR-FREE CRYSTAL STRUCTURE OF HUMAN GLUTATHIONE REDUCTASE (PDB ENTRY 3GRS) AN ...IN THE INHIBITOR-FREE CRYSTAL STRUCTURE OF HUMAN GLUTATHIONE REDUCTASE (PDB ENTRY 3GRS) AN INTERSUBUNIT DISULFIDE BOND OF OPTIMAL GEOMETRY IS OBSERVED BETWEEN CYS 90 AND ITS CRYSTALLOGRAPHIC TWO-FOLD RELATED MATE. IN THIS ENTRY, HOWEVER, THIS INTERACTION IS NOT AS OPTIMAL DUE TO THE PERTURBATIONS IN THE PROTEIN STRUCTURE RESULTING FROM INHIBITOR BINDING. THE ELECTRON DENSITY CORRESPONDING TO THE REGION OF THE DISULFIDE BRIDGE IN QUESTION IS LESS AND ELONGATED WHEN COMPARED WITH THAT OF THE INHIBITOR-FREE STRUCTURE. THIS AGRESS WITH THE INCREASED MOBILITY OF THIS REGION IN THE INHIBITOR-BOUND STRUCTURE AND SUGGESTS A POSSIBLE DISRUPTION OF THE INTERSUBUNIT DISULFIDE BRIDGE IN FRACTION OF THE MOLECULES. HYDROGEN BONDING INTERACTIONS IN THIS REGION FURTHER SUPPORT A PARTIALLY OPEN CONFORMATION FOR THE CYS 90 - CYS90' DISULFIDE BOND. FOR A MORE EXTENSIVE DISCUSSION PLEASE CONSULT THE JRNL REFERENCE.
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実験情報
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実験
実験
手法: X線回折
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試料調製
結晶
マシュー密度: 2.74 Å3/Da / 溶媒含有率: 55.14 %
結晶化
*PLUS
pH: 7 / 手法: 蒸気拡散法, ハンギングドロップ法
溶液の組成
*PLUS
ID
濃度
一般名
Crystal-ID
Sol-ID
1
20mg/ml
hGR
1
drop
2
3 %
ammoniumsulfate
1
drop
3
0.1M
potassiumphosphate
1
drop
4
0.1 %
beta-octylglucoside
1
drop
5
21-23 %
ammoniumsulfate
1
reservoir
6
0.1M
potassiumphosphate
1
reservoir
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データ収集
放射
散乱光タイプ: x-ray
放射波長
相対比: 1
反射
*PLUS
最高解像度: 2 Å / Num. obs: 33736 / % possible obs: 92 % / Rmerge(I) obs: 0.071