Interaction of Paratropomyosin with β-Connectin and Its 400-kiloDalton Fragment from Chicken Skeletal Muscle as Influenced by the Calcium Ion Concentration

概要

論文の詳細を見る
The binding of paratropomyosin to β-connectin, which has been suggested to interact at the A-I junction of a sarcomere, was confirmed by measuring the changes in turbidity of a mixture with changing NaCl concentration, pH and free calcium ions, and by morphological observation and a coprecipitation assay of the aggregates formed in the mixture. Paratropomyosin also bound to the 400-kDa fragment which is the N-terminal portion of β-connectin and contains the A-I junction region. Moreover, the interaction of paratropomyosin with the 400-kDa fragment was enhanced by a calcium ion concentration from 10^<-7>M to 10^<-5>M and markedly suppressed above 10^<-4>M calcium ions. We conclude that paratropomyosin probably binds to the 400-kDa fragment of β-connectin in the A-I junction region in living and pre-rigor skeletal muscle. In postmortem skeletal muscle paratropomyosin may be released from the 400-kDa portion of the connection filament by increased calcium ion concentration and translocated on to thin filaments to induce meat tenderization.
社団法人日本農芸化学会の論文
1999-08-23