title: Connectin content and its post-mortem changes in fish muscle.
abstract: Connectin was isolated from fish dorsal myofibrils by an SDS-gel filtration method and estimated to account for approximately 13% of the total myofibrillar proteins. There was no significant difference in the amount of connectin among seven fish species but rabbit skeletal myofibrils contained a slightly higher content (16%) of connectin. The high molecular weight connectins from carp and rabbit both showed a doublet band, consisting of bands 1 and 2, on SDS-polyacrylamide gel electrophoresis using a large-pore gel. However, rabbit band 1 (a component of the connectin doublet) was found to migrate more slowly than carp band 1. During post-mortem ageing of the muscles, it was observed that the band 1 component rapidly disappeared with a concomitant increase in band 2 component and then the band 2 component was transformed slowly into faster migrating components. These results suggest that post-mortem ageing has qualitatively similar effects on the submolecular compositions of carp and rabbit connectins. However, the apparent rate of disappearance of the band 1 component was considerably higher in carp muscle than that in rabbit muscle.
mesh_terms: D000818:Animals; D002347:Carps; D064211:Connectin; D004591:Electrophoresis, Polyacrylamide Gel; D005399:Fishes; D008970:Molecular Weight; D009124:Muscle Proteins / Q000032:analysis*; D009132:Muscles / Q000473:pathology*; D009210:Myofibrils / Q000032:analysis; D011180:Postmortem Changes; D011494:Protein Kinases; D011817:Rabbits; D012754:Sharks; D013045:Species Specificity; D014337:Trout
chemical_list: D064211:Connectin; D009124:Muscle Proteins; D011494:Protein Kinases