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Science 7 July 1972:
Vol. 177. no. 4043, pp. 56 - 58
DOI: 10.1126/science.177.4043.56
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Articles

A Binding Protein for Fatty Acids in Cytosol of Intestinal Mucosa, Liver, Myocardium, and Other Tissues

Robert K. Ockner 1, Joan A. Manning 1, Ruth B. Poppenhausen 1, and William K. L. Ho 1

1 Department of Medicine, University of California School of Medicine, San Francisco 94122

A protein of molecular weight sim 12,000 which binds long-chain fatty acids and certain other lipids has been identified in cytosol of intestinal mucosa, liver, myocardium, adipose tissue, and kidney. Binding is noncovalent and is greater for unsaturated than for saturated and medium-chain fatty acids. This protein appears to be identical with the smaller of two previously described cytoplasmic anion-binding proteins. Binding of long-chain fatty acids by this protein is greater than that of other anions tested, including sulfobromophthalein, and does not depend on negative charge alone. The presence of this binding protein may explain previously observed differences in intestinal absorption among fatty acids, and the protein may participate in the utilization of long-chain fatty acids by many mammalian tissues.


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