Influence of Various Nucleotides on the in Situ Crystallization of Ca2+-ATPase

A reproducible in situ crystallization of the Ca2+-ATPase in isolated sarcoplasmic reticulum (SR) membranes was studied. The addition of various nucleotides to the washing buffer allowed the formation of tubular crystals, which is induced by vanadate. SR membranes washed with nucleotide-free buffer could not form tubular crystals upon subsequent incubation with vanadate.