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Research Article |
1 Craniofacial Developmental Biology and Regeneration Branch, National Institute
of Dental and Craniofacial Research, National Institutes of Health, Bethesda,
MD 20892-4370, USA
2 Department of Tissue Biology, Jerome H. Holland Laboratory, American Red
Cross, Rockville, MD 20855, USA
* Author for correspondence (e-mail: kenneth.yamada{at}nih.gov )
Accepted 19 February 2002
Integrin receptors mediate the formation of adhesion complexes and play
important roles in signal transduction from the extracellular matrix.
Integrin-based adhesion complexes (IAC) contain proteins that link integrins
to the cytoskeleton and recruit signaling molecules, including vinculin,
paxillin, focal adhesion kinase, talin and
-actinin. In this study, we
describe a
160 kDa protein that is markedly enriched at IAC induced by
clustering integrins with fibronectin-coated beads. Protein sequence analysis
reveals that this
160 kDa protein is kinectin. Kinectin is an integral
membrane protein found in endoplasmic reticulum, and it serves as a receptor
for the motor protein kinesin. Fibronectin-induced IAC sequestered over half
of the total cellular content of kinectin within 20 minutes. In addition, two
other ER-resident proteins, RAP [low-density lipoprotein receptor-related
protein (LRP) receptor-associated protein] and calreticulin, were found to be
clustered at IAC, whereas kinesin was not. Our results identify a novel class
of constituents of IAC.
Key words: Adhesion, Integrin, Kinectin, Kinesin-binding proteins, Endoplasmic reticulum, Fibronectin
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