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Published 20 August 2001. doi:10.1083/jcb.200012098
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© The Rockefeller University Press, 0021-9525/2001/8/691 $5.00
The Journal of Cell Biology, Volume 154, Number 4, August 20, 2001 691-698

Report

 The BPAG1 locus : alternative splicing produces multiple isoforms with distinct cytoskeletal linker domains, including predominant isoforms in neurons and muscles



Conrad L. Leung1, Min Zheng1, Susan M. Prater1 and Ronald K.H. Liem1,2

1 Department of Pathology, Columbia University College of Physicians and Surgeons, New York, NY 10032
2 Department of and Anatomy Cell Biology, Columbia University College of Physicians and Surgeons, New York, NY 10032

Address correspondence to Ronald K.H. Liem, Department of Pathology, Columbia University College of Physicians and Surgeons, 630 West 168th St., New York, NY 10032. Tel.: (212) 305-4078. Fax: (212) 305-5498. E-mail: RKL2{at}columbia.edu

Bullous pemphigoid antigen 1 (BPAG1) is a member of the plakin family with cytoskeletal linker properties. Mutations in BPAG1 cause sensory neuron degeneration and skin fragility in mice. We have analyzed the BPAG1 locus in detail and found that it encodes different interaction domains that are combined in tissue-specific manners. These domains include an actin-binding domain (ABD), a plakin domain, a coiled coil (CC) rod domain, two different potential intermediate filament–binding domains (IFBDs), a spectrin repeat (SR)-containing rod domain, and a microtubule-binding domain (MTBD). There are at least three major forms of BPAG1: BPAG1-e (302 kD), BPAG1-a (615 kD), and BPAG1-b (834 kD). BPAG1-e has been described previously and consists of the plakin domain, the CC rod domain, and the first IFBD. It is the primary epidermal BPAG1 isoform, and its absence that is the likely cause of skin fragility in mutant mice. BPAG1-a is the major isoform in the nervous system and a homologue of the microtubule actin cross-linking factor, MACF. BPAG1-a is composed of the ABD, the plakin domain, the SR-containing rod domain, and the MTBD. The absence of BPAG1-a is the likely cause of sensory neurodegeneration in mutant mice. BPAG1-b is highly expressed in muscles, and has extra exons encoding a second IFBD between the plakin and SR-containing rod domains of BPAG1-a.

Key Words: intermediate filaments; actin; microfilaments; microtubules; plakin


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