ATP-dependent Calcium Transport by a Golgi-enriched Membrane Fraction from Mouse Mammary Gland

Overview

Journal J Membr Biol

Date 1981 Jan 1

PMID 6268790

Citations 14

Authors

M C Neville

F Selker

K Semple

C Watters

Affiliations

Soon will be listed here.

Abstract

Crude particulate preparations from the mammary glands of lactating mice were shown to transport calcium against a concentration gradient in the presence of ATP and mitochondrial inhibitors. Density gradient centrifugation with both sucrose and Percoll gradients indicated the presence of ATP-dependent transport in more than one membrane fraction. A Golgi-enriched membrane fraction possessed the highest specific activity of calcium transport. Digitonin, which increases the permeability of plasma membranes to calcium, did not affect this process. The Golgi fraction contained a 100,000 Dalton protein whose phosphorylation by gamma-[32P]-ATP was enhanced by a micromolar concentrations of free calcium. The phosphorylation was acid-stable and hydroxylamine-sensitive. These properties suggest that Golgi membranes in an activity secreting mammary epithelium possess a calcium transport system which resembles the calcium ATPase present in the sarcoplasmic reticulum of skeletal muscle.

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