Low-angle x-ray diffraction from concentrated sols of F-actin.

摘要: X-RAY diffraction maxima from an ordered array of identical particles can arise either the internal structure each particle or interparticle repeat. If Bragg spacing varies with concentration in preparation, it is generally safe to assume that one. In case F-actin, previous workers1,2 who studied dried fibres by X-ray observed equatorial reflexion a 55 A, which increased as relative humidity was raised2. It therefore concluded this represented interfilament has also been deduced3 120 A living molluscan smooth muscle arises side-by-side packing actin filaments: obtained well vertebrate muscle, and changes tonicity medium4,5. view these results puzzling when Vazina et al.6 concentrated sols F-actin positions their low-angle reflexions did not change protein concentration; they concluded, fact, (at 230 110 A) arose axial periodicity filaments rather than