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Mol. Cell. Biol., 10 1995, 5725-5731, Vol 15, No. 10
OM Rivero-Lezcano, A Marcilla, JH Sameshima and KC Robbins
In the second of a series of experiments designed to identify p47nck- Src
homology 3 (SH3)-binding molecules, we report the cloning of SAKAP II (Src
A box Nck-associated protein II) from an HL60 cDNA expression library. This
molecule has been identified as a cDNA encoding the protein product of
WASP, which is mutated in Wiskott-Aldrich syndrome patients. Studies in
vivo and in vitro demonstrated a highly specific interaction between the
SH3 domains of p47nck and Wiskott-Aldrich syndrome protein. Furthermore,
anti-Wiskott-Aldrich syndrome protein antibodies recognized a protein of 66
kDa by Western blot (immunoblot) analysis. In vitro translation studies
identified the 66-kDa protein as the protein product of WASP, and
subcellular fractionation experiments showed that p66WASP is mainly present
in the cytosol fraction, although significant amounts are also present in
membrane and nuclear fractions. The main p47nck region implicated in the
association with p66WASP was found to be the carboxy-terminal SH3 domain.
Copyright © 1995, American Society for Microbiology
Wiskott-Aldrich syndrome protein physically associates with Nck through Src homology 3 domains
Laboratory of Cellular Development and Oncology, National Institute of Dental Research, Bethesda, Maryland 20892-4330, USA.
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