Molecular cloning and expression of a novel adhesion molecule, SC1
- PMID: 1931049
- DOI: 10.1016/0896-6273(91)90366-8
Molecular cloning and expression of a novel adhesion molecule, SC1
Abstract
SC1, an integral membrane glycoprotein of 100 kd, is uniquely and transiently expressed on spinal cord motoneurons early in development and appears in peripheral neurons and several other tissues during development. SC1 has been purified by immunoaffinity techniques, and SC1 cDNA clones have been obtained by screening an E4 chick embryo phage expression library with a rabbit polyclonal antibody produced against purified SC1. The deduced protein sequence of 588 amino acids consists of a signal peptide, five immunoglobulin-like domains, a transmembrane region, and a short cytoplasmic tail. The sequence is most similar to MUC18, reported as a tumor progression marker in human melanoma. Transfection of SC1 cDNA into mammalian cells leads to cell surface expression of SC1 antigen and a subsequent increase in cell-cell adhesion. SC1 molecules bind to each other via a homophilic adhesion mechanism, independently of calcium or magnesium ions. SC1 may have a role in lateral motor column formation or neurite growth or fasciculation.
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