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Mol. Cell. Biol., Apr 1996, 1770-1776, Vol 16, No. 4
H Hasegawa, E Kiyokawa, S Tanaka, K Nagashima, N Gotoh, M Shibuya, T Kurata and M Matsuda
CRK belongs to a family of adaptor proteins that consist mostly of SH2 and
SH3 domains. Far Western blotting with CRK SH3 has demonstrated that it
binds to 135- to 145-, 160-, and 180-kDa proteins. The 135- to 145-kDa
protein is C3G, a CRK SH3-binding guanine nucleotide exchange protein.
Here, we report on the molecular cloning of the 180-kDa protein, which is
designated DOCK180 (180-kDa protein downstream of CRK). The isolated cDNA
contains a 5,598-bp open reading frame encoding an 1,866-amino-acid
protein. The deduced amino acid sequence did not reveal any significant
homology to known proteins, except that an SH3 domain was identified at its
amino terminus. To examine the function of DOCK180, a Ki-Ras farnesylation
signal was fused to the carboxyl terminus of DOCK180, a strategy that has
been employed successfully for activation of adaptor-binding proteins in
vivo. Whereas wild-type DOCK180 accumulated diffusely in the cytoplasm and
did not have any effect on cell morphology, farnesylated DOCK180 was
localized on the cytoplasmic membrane and changed spindle 3T3 cells to
flat, polygonal cells. These results suggest that DOCK180 is a new effector
molecule which transduces signals from tyrosine kinases through the CRK
adaptor protein.
Copyright © 1996, American Society for Microbiology
DOCK180, a major CRK-binding protein, alters cell morphology upon translocation to the cell membrane
Department of Pathology, National Institute of Health, Toyama, Shinjuku- ku, Tokyo, Japan.
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