• Register
X
Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

X

Leaving Community

Are you sure you want to leave this community? Leaving the community will revoke any permissions you have been granted in this community.

No
Yes

Syntrophin binds to an alternatively spliced exon of dystrophin.

Dystrophin, the protein product of the Duchenne muscular dystrophy locus, is a protein of the membrane cytoskeleton that associates with a complex of integral and membrane-associated proteins. Of these, the 58-kD intracellular membrane-associated protein, syntrophin, was recently shown to consist of a family of three related but distinct genes. We expressed the cDNA of human beta 1-syntrophin and the COOH terminus of human dystrophin in reticulocyte lysates using an in vitro transcription/translation system. Using antibodies to dystrophin we immunoprecipitated these two interacting proteins in a variety of salt and detergent conditions. We demonstrate that the 53 amino acids encoded on exon 74 of dystrophin, an alternatively spliced exon, are necessary and sufficient for interaction with translated beta 1-syntrophin in our assay. On the basis of its alternative splicing, dystrophin may thus be present in two functionally distinct populations. In this recombinant expression system, the dystrophin relatives, human dystrophin related protein (DRP or utrophin) and the 87K postsynaptic protein from Torpedo electric organ, also bind to translated beta 1-syntrophin. We have found a COOH-terminal 37-kD fragment of beta 1-syntrophin sufficient to interact with translated dystrophin and its homologues, suggesting that the dystrophin binding site on beta 1-syntrophin occurs on a region that is conserved among the three syntrophin homologues.

Pubmed ID: 7844150

Authors

  • Ahn AH
  • Kunkel LM

Journal

The Journal of cell biology

Publication Data

February 6, 1995

Associated Grants

  • Agency: NIGMS NIH HHS, Id: 2T32GM07753
  • Agency: NICHD NIH HHS, Id: HD18658
  • Agency: NIGMS NIH HHS, Id: T32 GM007753

Mesh Terms

  • Alternative Splicing
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • DNA, Complementary
  • Dystrophin
  • Dystrophin-Associated Proteins
  • Exons
  • Humans
  • Membrane Proteins
  • Molecular Sequence Data
  • Muscle Proteins
  • Precipitin Tests
  • Protein Binding
  • Protein Biosynthesis
  • Sequence Homology, Amino Acid
  • Torpedo