Synaptojanin-1, RNA recognition motif (IPR034971)

Short name: SYNJ1_RRM

Overlapping homologous superfamilies

Domain relationships


This entry represents the RNA recognition motif (RRM) of synaptojanin-1.

Synaptojanin-1 was originally identified as one of the major Grb2-binding proteins that may participate in synaptic vesicle endocytosis [PMID: 9428629]. It also acts as an Src homology 3 (SH3) domain-binding brain-specific inositol 5-phosphatase, with a putative role in clathrin-mediated endocytosis [PMID: 21932368, PMID: 21316588]. Synaptojanin-1 contains an N-terminal domain homologous to the cytoplasmic portion of the yeast protein Sac1p [PMID: 9788876], a central inositol 5-phosphatase domain followed by a putative RNA recognition motif (RRM), and a C-terminal proline-rich region mediating the binding of synaptojanin-1 to various SH3 domain-containing proteins including amphiphysin, SH3p4, SH3p8, SH3p13, and Grb2 [PMID: 10542231].

Synaptojanin-1 has two tissue-specific alternative splicing isoforms, synaptojanin-145 expressed in brain and synaptojanin-170 expressed in peripheral tissues. Synaptojanin-145 is very abundant in nerve terminals and may play an essential role in the clathrin-mediated endocytosis of synaptic vesicles [PMID: 8798761]. In contrast to synaptojanin-145, synaptojanin-170 contains three unique asparagine-proline-phenylalanine (NPF) motifs in the C-terminal region, and may function as a potential binding partner for Eps15, a clathrin coat-associated protein acting as a major substrate for the tyrosine kinase activity of the epidermal growth factor receptor [PMID: 9428629].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.