Evidence from electron paramagnetic resonance for function-related conformation changes in the anion-transport protein of human erythrocytes.
Evidence from electron paramagnetic resonance for function-related conformation changes in the anion-transport protein of human erythrocytes.
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来自电子顺磁共振的证据表明人红细胞阴离子转运蛋白的功能相关构象变化。
DOI:
10.1111/j.1432-1033.1981.tb05177.x
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发表时间:
1981
期刊:
影响因子:
--
通讯作者:
Grisham,CM
中科院分区:
文献类型:
--
作者:
Ginsburg,H;O'Connor,SE;Grisham,CM
The erythrocyte membrane protein involved in anion transport (band 3) wits isolated in its native lipid milieu in the form of leaky vesicles and then was spin‐labelled withN‐(1‐oxyl‐2,2,6,6‐tetramethyl‐4‐piperidinyl)‐maleimide (MalMe4PipO). The resulting electron paramagnetic resonance spectrum of band‐3‐bound MalMe4PipO was resolved into rapid tumbling component and another, relatively immobile component. The percentage of the signal contributed by the mobile component (Q), was sensitive to various characteristic factors known to affect erythrocyte anion transport:Qwas a hyperbolic function of chloride concentration displaying a half saturation constantK1/2similar to that of chloride transport. On the other handQshowed a biphasic response to sulfate concentration, in line with the relatively high affinity of sulfate for the anion modifier site.Qwas a saturable function of pH, either in presence of Cl−or SO−24, showing a pKabetween pH 6.0 and 6.5, in analogy with the pH titration curve of Cl−and SO−24transport. Spin‐labelled vesicles treated with a covalent inhibitor of anion transport, 4‐acetamido‐4′‐isothiocyanostilbene‐2,2′‐disulfonic acid, were markedly less susceptible to changes in CI−concentration. It is suggested that the electron paramagnetic resonance spectrum of MalMe4PipO covalently bound to the band‐3 protein, reports conformational changes which are related to the anion‐transport function of this protein.
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影响因子:
3.1
作者:
W. Heiligenberg
通讯作者:
W. Heiligenberg
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
C. Hopkins;T. Bullock;W. Heiligenberg
通讯作者:
W. Heiligenberg
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
J. Camhi
通讯作者:
J. Camhi
影响因子:
15.9
作者:
C. Hopkins
通讯作者:
C. Hopkins
影响因子:
2.5
作者:
E. Knudsen
通讯作者:
E. Knudsen