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. 1987 May;84(10):3239–3243. doi: 10.1073/pnas.84.10.3239

The very late antigen family of heterodimers is part of a superfamily of molecules involved in adhesion and embryogenesis.

Y Takada, J L Strominger, M E Hemler
PMCID: PMC304844  PMID: 3033641

Abstract

The very late antigen (VLA) protein family contains at least five related heterodimers, including a fibronectin receptor structure, and probably other cell substrate adhesion receptors. These cell-surface VLA proteins were immunopurified from human placenta (VLA-1, VLA-3, and VLA-5), platelets (VLA-2), and Molt-4 cells (VLA-4) using a series of monoclonal antibody-Sepharose immunoaffinity columns. After further purification by gel electrophoresis, the N-terminal amino acid sequence for each of the five VLA alpha subunits was determined. In the first 14 positions, the five VLA alpha subunits showed an average of 42% homology to each other, rising to 59% including conservative amino acid substitutions. In addition, the alpha subunits from the LFA-1, Mac-1 (CR-3), and p150,95 family of heterodimers, the vitronectin receptor-platelet GPIIb/IIIa family, and a position-specific (PS) antigen important in Drosophila embryogenesis each showed average homologies of 31-40% to individual VLA alpha sequences and 46-52% homology to VLA alpha subunits including conservative substitutions. Taken together, these results suggest that the VLA proteins, the LFA-1, Mac-1, and p150,95 family, the GPIIb/IIIa, vitronectin receptor family, and the Drosophila PS antigens have evolved as four subgroups in a highly conserved supergene family of receptors involved in fundamentally important functions, such as cell adhesion, migration, and embryogenesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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