| Literature DB >> 18433898 |
Yoshiki Okajima1, Hiroshi Nagasaki, Chizuko Suzuki, Hidetaka Suga, Nobuaki Ozaki, Hiroshi Arima, Yoji Hamada, Olivier Civelli, Yutaka Oiso.
Abstract
Thyrostimulin is a heterodimeric hormone composed of GPA2 and GPB5, and shares the thyroid-stimulating hormone receptor (TSHR). Thyrostimulin has three N-linked oligosaccharide chains, two in GPA2 and one in GPB5. The roles of these N-linked oligosaccharides in secretion, heterodimer formation and signal transduction were analyzed. Recombinant GPA2s lacking either of the two oligosaccharides were obtained from conditioned medium, whereas dual site-disrupted GPA2 and the GPB5 mutant were not expressed in either the conditioned medium or cell lysate. The binding between GPA2 and GPB5 was weaker than that between TSH subunits GPA1 and TSH beta. Neither of the oligosaccharides in GPA2 had significant effects on heterodimerization. Disruption of either of the oligosaccharides in GPA2 significantly decreased receptor activation, suggesting their critical role in receptor activation.Entities:
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Year: 2008 PMID： 18433898 DOI： 10.1016/j.regpep.2008.03.002
Source DB: PubMed Journal: Regul Pept ISSN： 0167-0115