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Mucosal crude microsomes, prepared from proximal rat small intestine, exhibited significant Mg-dependent, Zn-ATPase activity; V max = 23 μmoles Pi/mg protein/hr, K m = 160 nm, and Hill Coefficient, n= 1.5. Partial purification (∼10-fold) was achieved by detergent extraction, and centrifugation through 250 mm sucrose: V max = 268 units, K m = 1 nm, and n= 6. In partially purified preparations, the assay was linear with time to 60 min, and with protein concentration to 1 μg/300 μl. Activities at pH 8 and 8.5 were higher than at pH 7.2. The ATP K m was 0.7 mm, with an optimal ATP/Mg ratio of ∼2. Ca elicited ATPase activity but did not augment the Zn-dependent activity. In partially purified preparations, the homologous salts of Co, Cd, Cu, and Mn exhibited no detectable activity. Vanadate inhibition studies yielded two component kinetics with a K i of 12 μm for the first component, and 96 μm for the second component, in partially purified preparations. Tissue distribution analyses revealed gradients of activity. In the proximal half of the small intestine, Mg/Zn activity increased progressively from crypt to villus tip. In long axis studies, this activity decreased progressively from proximal to distal small bowel.
The Journal of Membrane Biology – Springer Journals
Published: May 1, 2001
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