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:
影响因子:
--
通讯作者:
Bryant,RG
中科院分区:
文献类型:
--
作者:
Zhang,H;Bryant,RG
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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影响因子:
2.2
作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
G. Z. Siatecki
影响因子:
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作者:
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通讯作者:
D. Auld
DOI:
10.1073/pnas.78.6.3408
发表时间:
1981
影响因子:
11.1
作者:
Rees,DC;Lewis,M;Honzatko,RB;Lipscomb,WN;Hardman,KD
通讯作者:
Hardman,KD
DOI:
--
发表时间:
1989
期刊:
影响因子:
--
作者:
J. Hirschinger;A. English
通讯作者:
A. English