Structural elements of z-disks
Tskhovrebova, L.A.
Biofizika 35(2): 312-316
1990
ISSN/ISBN: 0006-3029 PMID: 2369605 Document Number: 360087
Structural features of the Z-line were examined in negative stained rabbit psoas myofibrils. The data obtained allow to conclude that: 1) the amount of overlap of actin-containing filaments from apposing sarcomeres is about 50 nm; 2) there are five bands of extra density separated by the distances approximately 20 nm across entire Z-line width, and three central of these bands are localized in the actin overlap region; 3) the axial repeating distance between Z-filament attachment sites on thin filament is found to be 17-20 nm. A model for the array of cross-bridges between action-containing filaments in Z-line is presented.