Structural differences between plasma-membrane 5′-nucleotidase in different cell types as evidenced by antibodies
- 15 December 1985
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 232 (3), 859-862
- https://doi.org/10.1042/bj2320859
Abstract
Antibodies raised against bovine 5''-nucleotidase inhibit this enzyme as well as 5''-nucleotidase from other bovine tissues, showing common structure(s) between these proteins. However, an IgG fraction directed against the glucidic moiety of the liver enzyme did not cross-react with the enzyme from lymphocyte or caudate nuclei, a clear indication that within the same species the 5''-nucleotidase differs from one cell type to another. In addition, immunoblots after electrophoresis show that the previous antibodies recognize 5''-nucleotidase from human, mouse or chicken origin. However, only human 5''-nucleotidase activity can be inhibited by the antibodies. Thus at least three groups of antigenic determinants must exist on the 5''-nucleotidase: one related to the glucidic moiety of the glycoprotein whose binding inhibits the enzyme activity, another related to the catalytic sites, as its binding also led to enzyme inhibition, and a last one of structural nature. It seems that the third group of determinant is common to many species, whereas the second one is more restricted.This publication has 26 references indexed in Scilit:
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