Syntenin 2 (ST2)

Syntenin 2 binds to the cytoplasmic domains of the syndecans: it contains a tandem repeat of PDZ domains that reacts with the FYA (phe-tyr-ala) C-terminal amino acid sequence of the syndecans.Cells that overexpress the fusion protein show numerous cell surface extensions, suggesting that Syntenin 2 may have an effect on cytoskeleton-membrane organization. Therefore, Syntenin 2 may function as an adaptor that couples syndecans to cytoskeletal proteins or cytosolic downstream signal-effectors.Syndecan-2 is a transmembrane (type I) heparan sulfate proteoglycan and is a member of the syndecan proteoglycan family. The syndecans mediate cell binding, cell signaling, and cytoskeletal organization and syndecan receptors are required for internalization of the HIV-1 tat protein.