Abstract
Purified membrane-bound Na,K-ATPase incubated with cobalt-tetrammine-ATP [Co(NH 3) 4ATP], which is a stable MgATP complex analog, shows two new types of membrane crystals, a new p21 form and a p4 form. The building blocks of the crystalline arrays correspond to ( αβ) 2 dimers of the enzyme protein suggesting that α-α interaction may be important in the pumping process.
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