Extended Hormone Binding Site of the Human Thyroid Stimulating Hormone Receptor

Extended Hormone Binding Site of the Human Thyroid Stimulating Hormone Receptor
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人甲状腺刺激激素受体的扩展激素结合位点

DOI:
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发表时间:
2008
影响因子:
4.8
通讯作者:
G. Krause
G. Krause
中科院分区:
生物学2区
文献类型:
--
作者:
Sandra M. Mueller;G. Kleinau;H. Jaeschke;R. Paschke;G. Krause

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人促甲状腺激素受体 (hTSHR) 属于糖蛋白激素受体,在其大的细胞外结构域结合激素。 TSHR 的胞外铰链区将 N 端富含亮氨酸的重复结构域与跨膜蛇形结构域连接起来。根据之前的研究,我们推断,除了富含亮氨酸的重复结构域处的激素结合之外,通过互补的电荷-电荷识别,TSHR 的铰链区可能存在额外的多个激素接触。在这里,我们通过定点诱变研究了 TSHR 铰链区高度保守的带电残基,以鉴定与牛 TSH (bTSH) 相互作用的氨基酸。事实上,TSHR 铰链区中的残基 Glu-297、Glu-303 和 Asp-382 对于 bTSH 结合以及部分信号转导至关重要。侧链取代表明 Glu-297 和 Asp-382 的负电荷对于 hTSHR 识别 bTSH 是必需的。已确定位置的丙氨酸突变体的多种组合揭示了对激素结合的负面影响增加。组装模型表明,破译的酸性残基在铰链区形成带负电荷的斑块,从而导致 bTSH 在 hTSHR 上的扩展结合模式。我们的数据表明,bTSH 的某些带正电荷的残基可能参与与 hTSHR 铰链区已鉴定的带负电荷的氨基酸的相互作用。我们证明铰链区代表了 hTSHR 激素结合和信号转导的细胞外中间连接器。
The human thyroid stimulating hormone receptor (hTSHR) belongs to the glycoprotein hormone receptors that bind the hormones at their large extracellular domain. The extracellular hinge region of the TSHR connects the N-terminal leucine-rich repeat domain with the membrane-spanning serpentine domain. From previous studies we reasoned that apart from hormone binding at the leucine-rich repeat domain, additional multiple hormone contacts might exist at the hinge region of the TSHR by complementary charge-charge recognition. Here we investigated highly conserved charged residues in the hinge region of the TSHR by site-directed mutagenesis to identify amino acids interacting with bovine TSH (bTSH). Indeed, the residues Glu-297, Glu-303, and Asp-382 in the TSHR hinge region are essential for bTSH binding and partially for signal transduction. Side chain substitutions showed that the negative charge of Glu-297 and Asp-382 is necessary for recognition of bTSH by the hTSHR. Multiple combinations of alanine mutants of the identified positions revealed an increased negative effect on hormone binding. An assembled model suggests that the deciphered acidic residues form negatively charged patches at the hinge region resulting in an extended binding mode for bTSH on the hTSHR. Our data indicate that certain positively charged residues of bTSH might be involved in interaction with the identified negatively charged amino acids of the hTSHR hinge region. We demonstrate that the hinge region represents an extracellular intermediate connector for both hormone binding and signal transduction of the hTSHR.
促甲状腺素 (TSH) 与 TSH 受体的多个离散区域相互作用:针对这些区域中的一个或多个区域的多克隆兔抗体可以抑制 TSH 结合和功能。
DOI: 10.1210/endo.134.3.8119184
发表时间: 1994
期刊: Endocrinology
影响因子: 4.8
作者:
Dallas,JS;Desai,RK;Cunningham,SJ;Morris,JC;Seetharamaiah,GS;Wagle,N;Goldblum,RM;Prabhakar,BS
通讯作者: Prabhakar,BS
促甲状腺素黄体生成素/绒毛膜促性腺激素受体胞外域嵌合体作为促甲状腺素受体功能的探针。
DOI: 10.1073/pnas.88.3.902
发表时间: 1991
影响因子: 11.1
作者:
Nagayama,Y;Wadsworth,HL;Chazenbalk,GD;Russo,D;Seto,P;Rapoport,B
通讯作者: Rapoport,B
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
Morris,JC;Bergert,ER;McCormick,DJ
通讯作者: McCormick,DJ
人促甲状腺素受体的定点诱变:天冬酰胺连接的寡糖在功能受体表达中的作用。
DOI: 10.1210/mend-5-1-29
发表时间: 1991
期刊: Molecular endocrinology (Baltimore, Md.)
影响因子: --
作者:
Russo,D;Chazenbalk,GD;Nagayama,Y;Wadsworth,HL;Rapoport,B
通讯作者: Rapoport,B
有证据表明促甲状腺素受体胞外域包含的不是一个,而是两个切割位点。
DOI: 10.1210/endo.138.7.5259
发表时间: 1997
期刊: Endocrinology.
影响因子: --
作者:
Chazenbalk,GD;Tanaka,K;Nagayama,Y;Kakinuma,A;Jaume,JC;McLachlan,SM;Rapoport,B
通讯作者: Rapoport,B