Figure 2. Myosin heads are more closely... | Rockefeller University Press

Figure 2.

$Myosin heads are more closely associated with actin in the presence of calcium. (A–C) Representative X-ray diffraction patterns from permeabilized porcine myocardium under resting (pCa 8.0) and activated (pCa 4.5) state from WT and D65A. (B and C) Lattice spacing (d1,0) (B) and equatorial intensity ratio (I1,1/I1,0) (C) change at different Ca2+ concentrations from WT (black) and D65A (red). (D) The radius of the center of mass of the crossbridges, Rm, at pCa 8.$

Myosin heads are more closely associated with actin in the presence of calcium. (A–C) Representative X-ray diffraction patterns from permeabilized porcine myocardium under resting (pCa 8.0) and activated (pCa 4.5) state from WT and D65A. (B and C) Lattice spacing (d_1,0) (B) and equatorial intensity ratio (I_1,1/I_1,0) (C) change at different Ca²⁺ concentrations from WT (black) and D65A (red). (D) The radius of the center of mass of the crossbridges, R_m, at pCa 8.

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