title: Goblin (ankyrin) in striated muscle: identification of the potential membrane receptor for erythroid spectrin in muscle cells.
abstract: Goblin , a high molecular weight (Mr, 260,000) polypeptide of avian erythrocyte plasma membranes characterized by hormone-dependent phosphorylation, is shown by a variety of criteria to be the avian equivalent of ankyrin, the membrane attachment protein for spectrin; a polyclonal monospecific goblin antiserum reacts specifically with ankyrin from mammalian erythrocyte ghosts; goblin and ankyrin have highly homologous, although distinct, two-dimensional peptide maps; and, in reconstitution experiments, goblin binds to spectrin and band 3 in approximately the same molar ratio as ankyrin. Immunoautoradiography and immunofluorescence with goblin antiserum reveal that a serologically related polypeptide (Mr, 235,000) is present in highly purified membrane fractions of mammalian myocardium and in whole extracts of adult chicken cardiac and skeletal muscle-nonerythroid tissues which express predominantly the erythroid (alpha beta-) spectrin phenotype. Erythroid spectrin and goblin (ankyrin) are codistributed in skeletal muscle at the sarcolemma as discrete foci adjacent to the Z lines and, in pectoral muscle, also at the periphery of the Z discs. These spatial relationships indicate that goblin and spectrin in muscle cells form a structural framework that serves as the attachment site for the myofiber at the level of the Z line on the sarcolemma.
mesh_terms: D000818:Animals; D001457:Anion Exchange Protein 1, Erythrocyte / Q000378:metabolism; D017487:Ankyrins; D002645:Chickens; D003429:Cross Reactions; D004910:Erythrocyte Membrane / Q000648:ultrastructure*; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D009124:Muscle Proteins / Q000378:metabolism*; D009132:Muscles / Q000648:ultrastructure*; D010446:Peptide Fragments / Q000032:analysis; D011485:Protein Binding; D012508:Sarcolemma / Q000378:metabolism; D013049:Spectrin / Q000378:metabolism*
chemical_list: D001457:Anion Exchange Protein 1, Erythrocyte; D017487:Ankyrins; D008565:Membrane Proteins; D009124:Muscle Proteins; D010446:Peptide Fragments; D013049:Spectrin