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© The Rockefeller University Press, 0021-9525/1999//539 $5.00
The Journal of Cell Biology, Volume 145, Number 3, , 1999 539-549


Regular Articles

Nectin/PRR: An Immunoglobulin-like Cell Adhesion Molecule Recruited to Cadherin-based Adherens Junctions through Interaction with Afadin, a PDZ Domain–containing Protein



Kenichi Takahashi*, Hiroyuki Nakanishi*, Masako Miyahara*, Kenji Mandai*, Keiko Satoh*, Ayako Satoh*, Hideo Nishioka*, Junken Aoki{ddagger}, Akio Nomoto{ddagger}, Akira Mizoguchi§, and Yoshimi Takai*,||

* Takai Biotimer Project, ERATO, Japan Science and Technology Corp., c/o JCR Pharmaceuticals Co., Ltd., Kobe 651-2241, Japan; {ddagger} Department of Microbiology, Tokyo Metropolitan Institute of Medical Science, Tokyo 113-0033, Japan; § Department of Anatomy and Neurobiology, Faculty of Medicine, Kyoto University, Kyoto 606-8501, Japan; and || Department of Molecular Biology and Biochemistry, Osaka University Medical School, Suita 565-0871, Japan

We have isolated a novel actin filament–binding protein, named afadin, localized at cadherin-based cell–cell adherens junctions (AJs) in various tissues and cell lines. Afadin has one PDZ domain, three proline-rich regions, and one actin filament–binding domain. We found here that afadin directly interacted with a family of the immunoglobulin superfamily, which was isolated originally as the poliovirus receptor–related protein (PRR) family consisting of PRR1 and -2, and has been identified recently to be the alphaherpes virus receptor. PRR has a COOH-terminal consensus motif to which the PDZ domain of afadin binds. PRR and afadin were colocalized at cadherin-based cell–cell AJs in various tissues and cell lines. In E-cadherin–expressing EL cells, PRR was recruited to cadherin-based cell–cell AJs through interaction with afadin. PRR showed Ca2+-independent cell–cell adhesion activity. These results indicate that PRR is a cell–cell adhesion molecule of the immunoglobulin superfamily which is recruited to cadherin-based cell–cell AJs through interaction with afadin. We rename PRR as nectin (taken from the Latin word "necto" meaning "to connect").

Key Words: afadin • cadherin • poliovirus receptor– related protein • immunoglobulin superfamily • zonula adherens



Abbreviations used in this paper: AJs, adherens junctions; CAM, cell adhesion molecule; F-actin, actin filament; GST, glutathione S-transferase; PRR, poliovirus receptor–related protein; ZA, zonula adherens; ZO, zonula occludens.

Junken Aoki's present address is Graduate School of Pharmaceutical Sciences, Tokyo University, Tokyo 113-0033, Japan. Akio Nomoto's present address is Department of Microbiology, Institute of Medical Science, Tokyo University, Tokyo 108-0071, Japan.



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