High-resolution yeast actin structures indicate the molecular mechanism of actin filament stiffening by cations.

These values are consistent with previous measurements 11 , and while there is no statistical difference in rise if compared to vertebrate actin filaments (rise 27.5 Å, twist −166.6°), there is a statistically highly significant 0.6° difference in twist ( p- value < 10 −15 ).

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