Nidogen 2 (NID2)

NID2 protein, 46% identical to NID1, contains a 30-residue signal peptide, 49 primarily central cys residues, 5 potential N-linked glycosylation sites, 2 tyr residues in a potential O-sulfation sequence, and a YGD rather than an RGD cell adhesion sequence.SDS-PAGE analysis showed that NID2 is expressed as a 200-kD protein, larger than the calculated mass of 148 kD, presumably due to oligosaccharide substitution as indicated by hexosamine analysis. Northern blot analysis revealed ubiquitous expression of a 5.5-kb NID2 transcript that was strongest in heart and placenta, moderate in pancreas, kidney, and skeletal muscle, and weakest in brain. Immunoblot analysis detected expression of NID2 in muscle, heart, placenta, kidney, skin, and testis, with weaker expression in liver and brain.