+検索条件
-Structure paper
タイトル | Structural insights into the mechanism of phosphate recognition and transport by XPR1. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 18, Year 2025 |
掲載日 | 2025年1月2日 |
![]() | Wenhui Zhang / Yanke Chen / Zeyuan Guan / Yong Wang / Meng Tang / Zhangmeng Du / Jie Zhang / Meng Cheng / Jiaqi Zuo / Yan Liu / Qiang Wang / Yanjun Liu / Delin Zhang / Ping Yin / Ling Ma / Zhu Liu / ![]() |
PubMed 要旨 | XPR1 is the sole protein known to transport inorganic phosphate (Pi) out of cells, a function conserved across species from yeast to mammals. Human XPR1 variants lead to cerebral calcium-phosphate ...XPR1 is the sole protein known to transport inorganic phosphate (Pi) out of cells, a function conserved across species from yeast to mammals. Human XPR1 variants lead to cerebral calcium-phosphate deposition and primary familial brain calcification (PFBC), a hereditary neurodegenerative disorder. Here, we present the cryo-EM structure of human XPR1 in both its Pi-unbound and various Pi-bound states. XPR1 features 10 transmembrane α-helices forming an ion channel-like structure, with multiple Pi recognition sites along the channel. Pathogenic mutations in two arginine residues, which line the translocation channel, disrupt Pi transport. Molecular dynamics simulations reveal that Pi ion undergoes a stepwise transition through the sequential recognition sites during the transport process. Together with functional analyses, our results suggest that this sequential arrangement allows XPR1 to facilitate Pi ion passage via a "relay" process, and they establish a framework for the interpretation of disease-related mutations and for the development of future therapeutics. |
![]() | ![]() ![]() ![]() |
手法 | EM (単粒子) |
解像度 | 2.9 - 3.3 Å |
構造データ | EMDB-61138, PDB-9j4x: EMDB-61139, PDB-9j51: EMDB-61140, PDB-9j52: EMDB-61141, PDB-9j53: |
化合物 | ![]() ChemComp-PC1: ![]() ChemComp-PO4: |
由来 |
|
![]() | TRANSPORT PROTEIN / Phosphate / Transport / XPR1 |