Abstract:
:We have isolated a monoclonal antibody, P4B2, which localizes to multiple anchorage junctions, namely, a subset of focal adhesions, the Z-disk of muscle, and neuromuscular junctions. Immunopurification of the antigen to this antibody from chicken brain tissue yielded a complex of three prominent proteins with mobilities of 36, 30, and 18 kDa. Amino acid sequencing of the purified proteins identified the 36-kDa protein as glyceraldehyde-3-phosphate dehydrogenase (GAPDH). The other two protein bands were heterogeneous, containing proteins found in the synaptic vesicle fusion core complex. Immunolocalization of P4B2 antigen in developing cultured muscle cells showed that the antigen is incorporated into Z-lines soon after the sarcomeric architecture was positive for alpha-actinin. Together, the data indicate the P4B2 antigen is part of a unique GAPDH-containing protein complex that may be involved in reinforcement of established cytoskeletal structures.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
McDonald KA,Muschler J,Horwitz AFdoi
10.1006/excr.1998.4155subject
Has Abstractpub_date
1998-09-15 00:00:00pages
305-18issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(98)94155-6journal_volume
243pub_type
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