The equine protease inhibitory system (Pi): Abnormal expressions of PiF,PiL, and PiS |
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Authors: | Scott D. Patterson Kevin Bell |
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Affiliation: | (1) Department of Physiology and Pharmacology, University of Queensland, 4067 St. Lucia, Brisbane, Queensland, Australia |
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Abstract: | Three cases of abnormal expression of the equine protease inhibitory alleles, Pi F, L, and S1, were observed following the examination of 30,000 plasma samples by one-dimensional acid (pH 4.6) polyacrylamide gel electrophoresis. Characterization of the abnormal proteins in terms of isoelectric point, molecular mass, inhibitory spectra, and sialic acid content was performed using one- and two-dimensional electrophoretic techniques. The Pi F and S1 abnormalities were postulated to be the result of amino acid substitutions causing alterations in the processing of the carbohydrate side chains. No explanation could be offered for the Pi L abnormality other than a charge shift mutation. Abnormal types, F*, L*, and S*1 behaved as alleles but the distribution of L* in offspring from one stallion (present in only 6 of 83 offspring) differed significantly from expectation.This work was supported by a grant from the Australian Stud Book, Alison Road, Randwick, N.S.W. 2031. |
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Keywords: | equine /content/v5wr1016x8075284/xxlarge945.gif" alt=" agr" align=" BASELINE" BORDER=" 0" >1-protease inhibitor abnormal expression mutation altered carbohydrate processing |
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