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Mol. Cell. Biol., 09 1995, 4819-4824, Vol 15, No. 9
JM Daniel and AB Reynolds
The tyrosine kinase substrate p120cas (CAS), which is structurally similar
to the cell adhesion proteins beta-catenin and plakoglobin, was recently
shown to associate with the E-cadherin-catenin cell adhesion complex.
beta-catenin, plakoglobin, and CAS all have an Arm domain that consists of
10 to 13 repeats of a 42-amino-acid motif originally described in the
Drosophila Armadillo protein. To determine if the association of CAS with
the cadherin cell adhesion machinery is similar to that of beta-catenin and
plakoglobin, we examined the CAS-cadherin- catenin interactions in a number
of cell lines and in the yeast two- hybrid system. In the prostate
carcinoma cell line PC3, CAS associated normally with cadherin complexes
despite the specific absence of alpha- catenin in these cells. However, in
the colon carcinoma cell line SW480, which has negligible E-cadherin
expression, CAS did not associate with beta-catenin, plakoglobin, or
alpha-catenin, suggesting that E-cadherin is the protein which bridges CAS
to the rest of the complex. In addition, CAS did not associate with the
adenomatous polyposis coli (APC) tumor suppressor protein in any of the
cell lines analyzed. Interestingly, expression of the various CAS isoforms
was quite heterogeneous in these tumor cell lines, and in the colon
carcinoma cell line HCT116, which expresses normal levels of E-cadherin and
the catenins, the CAS1 isoforms were completely absent. By using the yeast
two-hybrid system, we confirmed the direct interaction between CAS and
E-cadherin and determined that CAS Arm repeats 1 to 10 are necessary and
sufficient for this interaction.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
The tyrosine kinase substrate p120cas binds directly to E-cadherin but not to the adenomatous polyposis coli protein or alpha-catenin
Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
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