手法: 溶液NMR 詳細: The mechanism(s) of volatile anesthetic effects are poorly understood. We examined whether VA binding to druggable sites in calmodulin would effect [Ca2+]4-CaM dependent activity of enzymes. ...詳細: The mechanism(s) of volatile anesthetic effects are poorly understood. We examined whether VA binding to druggable sites in calmodulin would effect [Ca2+]4-CaM dependent activity of enzymes. We used high resolution NMR spectroscopy to determine the structure of the halothane [Ca2+]4-CaM complex, determining that the halothane molecules bind in the druggable sites. We used fluorescence assays to determine that VA mediate [Ca2+]4-CaM activation of smMLCK, but not the kd of [Ca2+]4-CaM binding to skMLCK. These results suggest that VA do not mediate [Ca2+]4-CaM dependent MLCK activity via direct interactions with druggable sites on [Ca2+]4-CaM.
NMR実験
Conditions-ID
Experiment-ID
Solution-ID
タイプ
1
1
1
3D HNCO
1
2
1
3D HNCA
1
3
1
3D HN(CA)CB
1
4
1
3DHBHA(CO)NH
1
5
1
3DH(CCO)NH
1
6
1
3D (H)CCH-TOCSY
1
7
1
3D (H)CCH-COSY
1
8
1
3D 1H-15N NOESY
1
9
1
3D 1H-13C NOESY
1
10
2
3D HNHA
1
11
2
2D 1H-15N NOE
-
試料調製
詳細
Solution-ID
内容
溶媒系
1
2 mM [U-99% 13C; U-99% 15N] CALCIUM ION, 20 mM CALCIUM ION, 20 mM N-{[2-({[1-(4-CARBOXYBUTANOYL)AMINO]-2-PHENYLETHYL}-HYDROXYPHOSPHINYL)OXY]ACETYL}-2-PHENYLETHYLAMINE, 95% H2O/5% D2O
95% H2O/5% D2O
2
2 mM [U-99% 15N] CALCIUM ION, 20 mM CALCIUM ION, 20 mM N-{[2-({[1-(4-CARBOXYBUTANOYL)AMINO]-2-PHENYLETHYL}-HYDROXYPHOSPHINYL)OXY]ACETYL}-2-PHENYLETHYLAMINE, 95% H2O/5% D2O
手法: simulated annealing, CHARMm22 energy minimization / ソフトェア番号: 1 詳細: XPLOR, 100 steps steepest descend - final refinement
NMR constraints
NOE constraints total: 808 / NOE intraresidue total count: 337 / NOE long range total count: 137 / NOE medium range total count: 137 / NOE sequential total count: 188 / Hydrogen bond constraints total count: 46 / Protein chi angle constraints total count: 65 / Protein other angle constraints total count: 65 / Protein phi angle constraints total count: 65 / Protein psi angle constraints total count: 65
代表構造
選択基準: closest to the average
NMRアンサンブル
コンフォーマー選択の基準: structures with the lowest energy 計算したコンフォーマーの数: 50 / 登録したコンフォーマーの数: 5