2MIC

NMR structure of p75 transmembrane domain in DPC micelles

2MIC の概要

• エントリーDOI: 10.2210/pdb2mic/pdb
• NMR情報: BMRB: 19673
• 分子名称: Tumor necrosis factor receptor superfamily member 16 (1 entity in total)
• 機能のキーワード: dimer, transmembrane, p75, membrane protein
• 由来する生物種: Rattus norvegicus (brown rat,rat,rats)
• 細胞内の位置: Membrane; Single-pass type I membrane protein: P07174
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 9124.68

構造登録者

Nadezhdin, K.,Arseniev, A.,Goncharuk, S.,Mineev, K. (登録日: 2013-12-12, 公開日: 2014-12-24, 最終更新日: 2024-10-16)

主引用文献

Nadezhdin, K.D.,Garcia-Carpio, I.,Goncharuk, S.A.,Mineev, K.S.,Arseniev, A.S.,Vilar, M.
Structural Basis of p75 Transmembrane Domain Dimerization.
J. Biol. Chem., 291:12346-12357, 2016

PubMed Abstract: Dimerization of single span transmembrane receptors underlies their mechanism of activation. p75 neurotrophin receptor plays an important role in the nervous system, but the understanding of p75 activation mechanism is still incomplete. The transmembrane (TM) domain of p75 stabilizes the receptor dimers through a disulfide bond, essential for the NGF signaling. Here we solved by NMR the three-dimensional structure of the p75-TM-WT and the functionally inactive p75-TM-C257A dimers. Upon reconstitution in lipid micelles, p75-TM-WT forms the disulfide-linked dimers spontaneously. Under reducing conditions, p75-TM-WT is in a monomer-dimer equilibrium with the Cys(257) residue located on the dimer interface. In contrast, p75-TM-C257A forms dimers through the AXXXG motif on the opposite face of the α-helix. Biochemical and cross-linking experiments indicate that AXXXG motif is not on the dimer interface of p75-TM-WT, suggesting that the conformation of p75-TM-C257A may be not functionally relevant. However, rather than mediating p75 homodimerization, mutagenesis of the AXXXG motif reveals its functional role in the regulated intramembrane proteolysis of p75 catalyzed by the γ-secretase complex. Our structural data provide an insight into the key role of the Cys(257) in stabilization of the weak transmembrane dimer in a conformation required for the NGF signaling.

PubMed: 27056327
DOI: 10.1074/jbc.M116.723585

実験手法

SOLUTION NMR