Evidence for cooperative signal triggering at the extracellular loops of the TSH receptor
Evidence for cooperative signal triggering at the extracellular loops of the TSH receptor
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TSH 受体细胞外环协同信号触发的证据
DOI:
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
G. Krause
中科院分区:
文献类型:
--
作者:
G. Kleinau;H. Jaeschke;Sandra M. Mueller;B. Raaka;S. Neumann;R. Paschke;G. Krause
The mechanisms governing transition of the thyroid stimulating hormone (TSH) receptor (TSHR) from basal to active conformations are poorly understood. Considering that constitutively activating mutations (CAMs) and inactivating mutations in each of the extracellular loops (ECLs) trigger only partial TSHR activation or inactivation, respectively, we hypothesized that full signaling occurs via multiple extracellular signal propagation events. Therefore, individual CAMs in the extracellular region were combined to create double and triple mutants. In support of our hypothesis, combinations of mutants in the ECLs are in some cases additive, while in others they are even synergistic, with triple mutant I486A/I568V/V656F exhibiting a 70‐fold increase in TSH‐independent signaling. The proximity but likely different spatial orientation of the residues of activating and inactivating mutations in each ECL supports a dual functionality to facilitate signal induction and conduction, respectively. This is the first report for G‐protein coupled receptors, suggesting that multiple and cooperative signal propagating events at all three ECLs are required for full receptor activation. Our findings provide new insights concerning molecular signal transmission from extracellular domains toward the transmembrane helix bundle of the glycoprotein hormone receptors.—Kleinau, G., Jaeschke, H., Mueller, S., Raaka, B. M., Neumann, S., Paschke, R., Krause, G. Evidence for cooperative signal triggering at the extracellular loops of the TSH receptor. FASEB J. 22, 2798–2808 (2008)
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DOI:
10.1210/en.2003-0430
发表时间:
2003
期刊:
Endocrinology.
影响因子:
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作者:
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DOI:
10.1210/mend.10.9.8885249
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1996
期刊:
Molecular endocrinology (Baltimore, Md.)
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通讯作者:
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