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The calcium uptake into renal brush border membrane vesicles, which has been purified from normal or vitamin B6 deficient rat renal cortex by calcium precipitation, was investigated. The values of Km and Vmax were determined to be 1.89 mM and 4.26 nmol of Ca2+/mg of protein per 20s in vitamin B6 deficient rats, respectively. This Vmax was lower than that of normal rats. The chemical compositions of renal brush border membranes did not display a difference in normal and vitamin B6 deficient rats. The amount of brush border membranes isolated from 1 gram of renal cortex in vitamin B6 deficient rats was less than in normal rats.
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