Characterization of enzyme-bound ligand dynamics by solid-state NMR in the presence of ligand exchange: L-phenylalanine on carboxypeptidase A.

Characterization of enzyme-bound ligand dynamics by solid-state NMR in the presence of ligand exchange: L-phenylalanine on carboxypeptidase A.
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在配体交换存在下通过固态 NMR 表征酶结合配体动力学:羧肽酶 A 上的 L-苯丙氨酸。

DOI:
10.1016/s0006-3495(95)80188-8
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发表时间:
1995
期刊:
Biophysical journal.
影响因子:
--
通讯作者:
Bryant,RG
Bryant,RG
中科院分区:
--
文献类型:
--
作者:
Zhang,H;Bryant,RG

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氘核磁共振光谱获得的L-苯丙氨酸-d5,氘代的苯环上,在交联的多晶样品的羧肽酶A含有不同量的水。氘粉末图案线的形状进行了模拟扩展的理论,包括一个本地reorientational运动的绑定L-苯丙氨酸苯环和交换的L-苯丙氨酸与晶内各向同性环境。光谱模拟与苯丙氨酸的苯环在结合环境中执行π-翻转一致,其速率从6%含水量的3 × 10(4)Hz变化到21%含水量的1 × 10(5)Hz。在研究的所有水含量下,配体与晶体中基本上各向同性的环境交换,速率常数约为2.5 × 10(-3)Hz。虽然L-苯丙氨酸的解离常数仅为18 mM,但很好地再现实验线形的光谱模拟不需要苯环旋转轴的显著摆动,这与通过X射线晶体学鉴定的结合相互作用一致。
Deuterium NMR spectra were obtained for L-phenylalanine-d5, deuterated on the phenyl ring, in cross-linked polycrystalline samples of carboxypeptidase A containing different amounts of water. The deuterium powder pattern line shapes are simulated by extension of the theory to include both a local reorientational motion of the bound L-phenylalanine phenyl ring and exchange of the L-phenylalanine with an intracrystalline isotropic environment. The spectral simulations are consistent with the phenyl ring of the phenylalanine executing pi-flips in the bound environment at rates that vary from 3 x 10(4) Hz at 6% water content to 1 x 10(5) Hz at 21% water content. At all water contents studied, the ligand exchanges with an essentially isotropic environment in the crystal with a rate constant of approximately 2.5 x 10(-3) Hz. Although the dissociation constant for the L-phenylalanine is only 18 mM, the spectral simulations that reproduce the experimental line shape well do not require significant wobble of the phenyl ring rotation axis, which is consistent with the binding interactions identified by x-ray crystallography.
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