Isoforms of C-protein in adult chicken skeletal muscle: detection with monoclonal antibodies

doi:10.1083/jcb.95.1.78

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Isoforms of C-protein in adult chicken skeletal muscle: detection with monoclonal antibodies

FC Reinach, T Masaki, S Shafiq, T Obinata and DA Fischman

Monoclonal antibodies (McAbs) specific for the C-proteins of chicken pectoralis major and anterior latissimus dorsi (ALD) muscles have been produced and characterized. Antibody specificity was demonstrated by solid phase radioimmunoassay (RIA), immunoblots, and immunofluorescence cytochemistry. Both McAbs MF-1 (or MF-21) and ALD-66 bound to myofibrillar proteins of approximately 150,000 daltons; the former antibody reacted with pectoralis but not ALD myofibrils, whereas the latter recognized ALD but not pectoralis myofibrils. Chromatographic elution of the antigens from DEAE-Sephadex, and their distribution in the A-band, support the conclusion that both of these antibodies recognize variant isoforms of C-protein. Since both McAbs react with a protein of similar molecular weight in the A-band of all myofibrils of the posterior latissimus dorsi (PLD) muscle, we suggest that either another isoform of C-protein exists in the PLD muscle or both pectoralis and ALD-like isoforms coexist in the A-bands of PLD muscle.
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