Structural insights into tetraspanin CD9 function

Rie Umeda, Yuhkoh Satouh, Mizuki Takemoto, Yoshiko Nakada-Nakura, Kehong Liu, Takeshi Yokoyama, Mikako Shirouzu, So Iwata, Norimichi Nomura, Ken Sato, Masahito Ikawa, Tomohiro Nishizawa, Osamu Nureki

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)


Tetraspanins play critical roles in various physiological processes, ranging from cell adhesion to virus infection. The members of the tetraspanin family have four membrane-spanning domains and short and large extracellular loops, and associate with a broad range of other functional proteins to exert cellular functions. Here we report the crystal structure of CD9 and the cryo-electron microscopic structure of CD9 in complex with its single membrane-spanning partner protein, EWI-2. The reversed cone-like molecular shape of CD9 generates membrane curvature in the crystalline lipid layers, which explains the CD9 localization in regions with high membrane curvature and its implications in membrane remodeling. The molecular interaction between CD9 and EWI-2 is mainly mediated through the small residues in the transmembrane region and protein/lipid interactions, whereas the fertilization assay revealed the critical involvement of the LEL region in the sperm-egg fusion, indicating the different dependency of each binding domain for other partner proteins.

Original languageEnglish
Article number1606
JournalNature Communications
Issue number1
Publication statusPublished - 2020 Dec 1


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