Clinical Chemistry
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Clinical Chemistry 24: 905-915, 1978;
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Shaw, L. M.
Right arrow Articles by Petersen, L. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Shaw, L. M.
Right arrow Articles by Petersen, L. E.

Clinical Chemistry, Vol 24, 905-915, Copyright © 1978 by American Association for Clinical Chemistry

Isolation of gamma-glutamyltransferase from human liver, and comparison with the enzyme from human kidney

LM Shaw, JW London and LE Petersen

We isolated gamma-glutamyltransferase [(gamma-glutamyl)-peptide:amino acid gamma-glutamyltransferase, EC 2.3.2.2] from human liver and compared some of its properties with the same enzyme prepared from human kidney. The enzymes from these two sources are very similar with respect to initial velocity kinetic constants, pH optima of the transpeptidation and autotransfer reactions, heat stability, competitive inhibition by glutathione of the colorimetric assay in which gamma-glutamyl-4-nitroanilide is substrate, stability of catalytic activity to trypsinization, and relative rates of transfer of the gamma-glutamyl moiety from gamma-glutamyl-4-nitroanilide and L- [glycine-2-3/]glutathione to some amino acids and small peptides. The kidney enzyme is inhibited more by the gamma-glutamyl acceptor substrate, glycylglycine, as reflected in a sevenfold lower value for the inhibition constant KiA. Major differences were observed in the lectin-binding properties of liver gamma-glutamyltransferase compared to the kidney enzyme. Lectin-binding property differences are retained for the trypsinized form of the liver and kidney enzymes, although the degree of precipitation was less for certain lectins as compared to the untreated enzyme. Lectin-binding properties were reversed by carbohydrates specific for each lectin. We adapted the histochemical staining technique of Rutenberg et al. [J. Histochem. Cytochem. 17, 517 (1969)] to the detection of gamma-glutamyltransferase activity in acrylamide gels; diffusion artifacts are minimized and the color produced is stable for several days. Untreated and trypsinized forms of the liver enzyme both migrated faster in acrylamide gels (as single bands) than did the corresponding forms of the kidney enzyme.


The following articles in journals at HighWire Press have cited this article:


Home page
 CLIN APPL THROMB HEMOSTHome page
T. Yardimci, A. Yaman, and O. Ulutin
Characterization of Platelet Gamma Glutamyltransferase and Its Alteration in Cases of Atherosclerosis
Clinical and Applied Thrombosis/Hemostasis, March 1, 1995; 1(2): 103 - 113.
[Abstract] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1978 by the American Association for Clinical Chemistry.