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Am J Physiol Gastrointest Liver Physiol 260: G736-G742, 1991;
0193-1857/91 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 260, Issue 5 736-G742, Copyright © 1991 by American Physiological Society

ARTICLES

Glycosylation is not required for ligand or receptor binding by expressed rat intrinsic factor

M. M. Gordon, C. Hu, H. Chokshi, J. E. Hewitt and D. H. Alpers
Division of Gastroenterology, Washington University Medical School, St. Louis, Missouri 63110.

A cDNA clone encoding rat intrinsic factor (IF), pIFQ, has been inserted into the eukaryotic expression vector pSVL and used to transfect COS-1 cells. The IF produced by the transfected cells was secreted nearly exclusively into the medium at concentrations of 0.1-0.2 micrograms/ml. Tunicamycin treatment (1-10 micrograms/ml) completely blocked N-linked glycosylation but had no effect on IF secretion. The secreted glycosylated IF retained all the properties of native IF, i.e., high affinity for cobalamin (Cbl) and for the IF-Cbl receptor and relative resistance to low pH and to proteolysis. The nonglycosylated IF also retained these properties except that it was more protease sensitive. The protease degradation was prevented by the presence of the ligand Cbl. The presence of carbohydrate may play a role in protecting IF from digestion by pancreatic proteases in the intestinal lumen.


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S. N. Fedosov, L. Berglund, N. U. Fedosova, E. Nexo, and T. E. Petersen
Comparative Analysis of Cobalamin Binding Kinetics and Ligand Protection for Intrinsic Factor, Transcobalamin, and Haptocorrin
J. Biol. Chem., March 15, 2002; 277(12): 9989 - 9996.
[Abstract] [Full Text] [PDF]


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