| First Author | Patrie KM | Year | 2005 |
| Journal | Biochim Biophys Acta | Volume | 1745 |
| Issue | 1 | Pages | 131-44 |
| PubMed ID | 16019084 | Mgi Jnum | J:100469 |
| Mgi Id | MGI:3588603 | Doi | 10.1016/j.bbamcr.2005.05.011 |
| Citation | Patrie KM (2005) Identification and characterization of a novel tight junction-associated family of proteins that interacts with a WW domain of MAGI-1. Biochim Biophys Acta 1745(1):131-44 |
| abstractText | The membrane-associated guanylate kinase protein, MAGI-1, has been shown to be a component of epithelial tight junctions in both Madin-Darby canine kidney cells and in intestinal epithelium. Because we have previously observed MAGI-1 expression in glomerular visceral epithelial cells (podocytes) of the kidney, we screened a glomerular cDNA library to identify the potential binding partners of MAGI-1 and isolated a partial cDNA encoding a novel protein. The partial cDNA exhibited a high degree of identity to an uncharacterized human cDNA clone, KIAA0989, which encodes a protein of 780 amino acids and contains a predicted coiled-coil domain in the middle of the protein. In vitro binding assays using the partial cDNA as a GST fusion protein confirm the binding to full-length MAGI-1 expressed in HEK293 cells, as well as endogenous MAGI-1, and also identified the first WW domain of MAGI-1 as the domain responsible for binding to this novel protein. Although a conventional PPxY binding motif for WW domains was not present in the partial cDNA clone, a variant WW binding motif was identified, LPxY, and found to be necessary for interacting with MAGI-1. When expressed in Madin-Darby canine kidney cells, the full-length novel protein was found to colocalize with MAGI-1 at the tight junction of these cells and the coiled-coil domain was found to be necessary for this localization. Because of its interaction with MAGI-1 and its localization to cell-cell junctions, this novel protein has been given the name MAGI-1-associated coiled-coil tight junction protein (MASCOT). |
