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- W2355443722 abstract "After staining with Congo Red,the glycerinated toad or frog sartorius muscleshows clear dichroism.After incubating the stained muscle fibers at around 43℃for 10 minutes the dichroism practically vanished.If the glycerinated muscle fiberhad been pretreated with ATP,they no longer showed dichroism after fur-ther staining with Congo Red.On the basis of these results and those reportedpreviously,it was argued that those Congo Red molecules,which contributed tothe dichroism of the stained muscle fibers,were mainly bound by myosin molecules,especiaUy the S-1 subunits of them.Thus it seems that Congo Red might be arather useful probe for studying the dynamic aspects of the S-1 subunits.In unstretched preparations,the sign of the dichroism is positive,showing thatmost of the Congo Red molecules bound by the myofibrillar proteins are orientedin the direction of the fiber axis.The absolute value of the dichroism decreasesas the muscle is stretched and becomes zero as the sarcomere length reaches about3.8μ,which,according to the interdigitating filament model of the myofibril,isapproximately equal to the sum of the lengths of the myosin and actin filaments.With further stretching,the dichroism reappears,but its sign changes to negativeshowing that a large part of the bound Congo Red molecules are now oriented ina direction perpendicular to the fiber axis.No matter whether the muscle is stre-tched after or before staining,the results obtained are the same.The dichroismchange is completed within the order of 10 milliseconds after each change of length.With the sarcomere length increasing from 1.7 to 4.4μ,the ratio of dichroism andoptical density of the muscle fiber varies linearly,Stretching of the stained muscleincreases the washing-out rate of Congo Red from the muscle fibers.An increasein pH value decreases the positive dichroism of the unstretched or slightly stretchedmuscle fibers,increases the negative dichroism of the stretched fibers,but has noeffect on the dichroic properties of the fibers with sarcomere length around 3.3μ.Urea and alcohol can abolish the dichroism of both stretched and unstretchedmuscle fibers.The possible explanations concerning the dichroism change arediscussed and it is argued that the possible change of crystallization of the contrac-tile proteins with stretch may play a role." @default.
- W2355443722 created "2016-06-24" @default.
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- W2355443722 date "1979-01-01" @default.
- W2355443722 modified "2023-09-25" @default.
- W2355443722 title "CONCERNING THE BINDING SITES OF MYOFIBRIL WITH CONGO RED AND THE DICHROISM CHANGE WITH MYOFIBRIL LENGTH OF CONGO RED STAINED GLYCERINATED SARTORIUS MUSCLE FIBERS" @default.
- W2355443722 hasPublicationYear "1979" @default.
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