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General Comment |
Receptor protein tyrosine phosphatase beta (RPTPbeta) expressed on the surface of
glial cells binds to the glycosylphosphatidylinositol (GPI)-anchored recognition
molecule contactin on neuronal cells leading to neurite outgrowth. Peles et al. (1997)
identified a 190-kD protein associated with the contactin-PTPRZ1 complex and cloned the
gene based on sequence derived from the purified protein. The 1,381-amino acid protein,
designated p190 or CASPR for 'contactin-associated protein,' includes an extracellular
domain with several putative protein-protein interaction domains, a putative
transmembrane domain, and a 74-amino acid cytoplasmic domain.
NCBI Summary:
The gene product was initially identified as a 190-kD protein associated with the contactin-PTPRZ1 complex. The 1,384-amino acid protein, also designated p190 or CASPR for 'contactin-associated protein,' includes an extracellular domain with several putative protein-protein interaction domains, a putative transmembrane domain, and a 74-amino acid cytoplasmic domain. Northern blot analysis showed that the gene is transcribed predominantly in brain as a transcript of 6.2 kb, with weak expression in several other tissues tested. The architecture of its extracellular domain is similar to that of neurexins, and this protein may be the signaling subunit of contactin, enabling recruitment and activation of intracellular signaling pathways in neurons. [provided by RefSeq, Jan 2009]
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