Effects of Mg2+ and Adenine Nucleotides on Thymidylate Synthetase from Different Mouse Tumors

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 1984 Jan 1

PMID 6231470

Citations 2

Authors

W Rode

M M Jastreboff

Affiliations

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Abstract

Magnesium ions variably influenced activity of highly purified thymidylate synthetase preparations from different mouse tumors, activating the enzyme from Ehrlich ascites carcinoma (EAC) cells and inhibiting the enzyme from L1210 and L5178Y cells and from 5-fluorodeoxyuridine (FdUrd)-resistant EAC cells. In the presence of Mg2+ in a concentration resulting in either maximum activation or inhibition (25-30 mM) the enzymes from both the sensitive and FdUrd-resistant EAC lines and L5178Y cells were activated by ATP. Under the same conditions of Mg2+ concentration ADP and AMP inhibited the enzyme from the parental but not from the FdUrd-resistant EAC cells.

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