Testicular membranes with improved stability of the gonadotropin receptor.

Testicular membranes with improved stability of the gonadotropin receptor.
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睾丸膜具有改善的促性腺激素受体稳定性。

DOI:
10.1016/0304-4165(82)90328-2
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发表时间:
1982
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Puett,D
Puett,D
中科院分区:
--
文献类型:
--
作者:
Noland,TD;Puett,D

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采用含有葡聚糖、聚乙二醇6000和Zn2+的双水相聚合物体系制备了大鼠睾丸的质膜组分。通过冷冻膜的解冻洗涤步骤,可以明显地稳定lutropin和人绒毛膜促性腺激素的膜相关受体,从而延长了未占用的膜相关受体的表观半衰期,从37°C下的不到1小时延长到大于5小时。此外,在与膜部分孵育后,未检测到125i标记的人绒毛膜促性腺激素的降解。平衡结合的表观结合常数为1.6·1010M−1,受体含量为33 fmol/mg蛋白。结合动力学得到的结合速率常数为1.0·108M−1,而人绒毛膜促性腺激素的解离速率常数太低,在使用的条件下无法准确测定。相比之下,羊绒毛膜促性腺激素可以可逆地结合到细胞膜上,留下先前占据的受体,供125i标记的人绒毛膜促性腺激素结合。
A plasma membrane fraction has been prepared from rat testis using an aqueous double-phase polymer system containing dextran, poly(ethylene glycol) 6000 and Zn2+. The membrane-associated gonadotropin receptor for lutropin and human choriogonadotropin can be markedly stabilized by a thawing-washing step of frozen membranes which prolongs the apparent half-life of the unoccupied membrane-associated receptors from less than 1 h at 37°C to greater than 5 h. Also, no degradation of125I-labeled human choriogonadotropin was detected following incubation with the membrane fraction. The equilibrium binding was characterized by an apparent association constant of 1.6 · 1010M−1and a receptor content of 33 fmol/mg protein. Binding kinetic yielded an association rate constant of 1.0 · 108M−1, while the dissociation rate constant for human choriogonadotropin was too low to be accurately determined under the conditions used. In contrast, ovine lutropin could be reversibly bound to the membranes leaving the previously occupied receptors available for binding by125I-labeled human choriogonadotropin.
促性腺激素和亚基构象。
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发表时间: 1975
影响因子: 3.9
作者:
L. Holladay;D. Puett
通讯作者: D. Puett
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发表时间: 1978
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hCG 诱导 Leydig 细胞早期脱敏。
DOI: --
发表时间: 1978
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
作者:
J. Saez;F. Haour;A. Cathiard
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发表时间: 1978
期刊: The Journal of biological chemistry
影响因子: --
作者:
T. Nakahara;S. Terada;J. Pincus;G. Flouret;O. Hechter
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