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