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J. Biol. Chem., Vol. 276, Issue 26, 24232-24241, June 29, 2001
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From the The dystrophin-associated protein complex (DPC)
is required for the maintenance of muscle integrity during the
mechanical stresses of contraction and relaxation. In addition to
providing a membrane scaffold, members of the DPC such as the
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AJ404859.
Dysbindin, a Novel Coiled-coil-containing Protein
That Interacts with the Dystrobrevins in Muscle and Brain*
,
§,
,

Department of Human Anatomy and Genetics,
University of Oxford, South Parks Road, Oxford OX1 3QX, United Kingdom,
the ¶ Department of Biochemistry, University of Oxford, South
Parks Road, Oxford OX1 3QU, United Kingdom, and the
** Department of Cell Biology and Anatomy and Genes and
Development Research Group, Faculty of Medicine, University of Calgary
Faculty of Medicine, University of Calgary, Calgary,
Alberta T2N 4N1, Canada
-dystrobrevin protein family are thought to play an important role
in intracellular signal transduction. To gain additional insights into
the function of the DPC, we performed a yeast two-hybrid screen for
dystrobrevin-interacting proteins. Here we describe the identification
of a dysbindin, a novel dystrobrevin-binding protein. Dysbindin is an
evolutionary conserved 40-kDa coiled-coil-containing protein that binds
to
- and
-dystrobrevin in muscle and brain. Dystrophin and
-dystrobrevin are co-immunoprecipitated with dysbindin, indicating
that dysbindin is DPC-associated in muscle. Dysbindin co-localizes with
-dystrobrevin at the sarcolemma and is up-regulated in
dystrophin-deficient muscle. In the brain, dysbindin is found primarily
in axon bundles and especially in certain axon terminals, notably mossy
fiber synaptic terminals in the cerebellum and hippocampus. These
findings have implications for the molecular pathology of Duchenne
muscular dystrophy and may provide an alternative route for anchoring
dystrobrevin and the DPC to the muscle membrane.
*
This work was supported in part by grants from the Wellcome
Trust (to D. J. B.) and the Medical Research Council of
Canada (to R. H.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Oxford BioMedica, Medawar Center, Oxford, OX4
4GA, United Kingdom.

Wellcome Trust Senior Fellow. To whom all correspondence
should be addressed. Tel./Fax: 44-1865-272183; E-mail:
dblake@enterprise.molbiol.ox.ac.uk.
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