인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
G protein-coupled receptors often form dimers and heterodimers at the plasma membrane to transduce signals from various ligands, including peptide hormones. However, the role of homodimerization in regulating signaling by the parathyroid hormone (PTH) type 1 receptor (PTH<sub>1</sub>R) has remained ambiguous. Here, we show that PTH<sub>1</sub>R exists as a monomer in live cells under both basal and ligand-bound conditions, even in the presence of a dimeric form of the PTH mutant, PTH<sup>R25C</sup> (residue 25 of PTH), which is linked with hypoparathyroidism. Single-molecule fluorescence imaging and single-cell FRET assays support the monomeric behavior of PTH<sub>1</sub>R, with molecular dynamics simulations using weighted ensemble sampling revealing that PTH<sup>R25C</sup> destabilizes the active conformation of the receptor. In contrast, a synthetic dimeric PTH<sup>R25C</sup> restores interactions near the receptor's N-terminal domain, maintains the active conformation, and rescues sustained cAMP signaling. These findings challenge previous assumptions about the homodimerization status of PTH<sub>1</sub>R and highlight how ligand dimerization, rather than receptor dimerization, governs PTH<sub>1</sub>R activation dynamics and location-biased cAMP signaling, offering mechanistic insights relevant to therapeutic strategies against hypoparathyroidism.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.