These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Thymidine-requiring mutants of Dictyostelium discoideum.
    Author: Podgorski G, Deering RA.
    Journal: Mol Cell Biol; 1984 Dec; 4(12):2784-91. PubMed ID: 6527688.
    Abstract:
    Two thymidine auxotrophs of Dictyostelium discoideum were isolated which improve the efficiency of in vivo DNA-specific radiolabeling. Mutant HPS400 lacked detectable thymidylate synthetase activity, required 50 micrograms of thymidine per ml, and incorporated sixfold more [3H]thymidine into nuclear DNA than did a wild-type strain. Either dTMP or exogenously provided DNA also permitted growth of this strain. The second mutant, HPS401, was isolated from HPS400 and also lacked thymidylate synthetase activity, but required only 4 micrograms of thymidine per ml for normal growth and incorporated 55 times more thymidine label than did a control strain. Incorporation of the thymidine analog 5'-bromodeoxyuridine was also markedly increased in the mutants. Catalytic properties of the thymidylate synthetase of D. discoideum investigated in cell extracts were consistent with those observed for this enzyme in other organisms. These strains should facilitate studies of DNA replication and repair in D. discoideum which require short-term labeling, DNA of high specific activity, or elevated levels of substitution in DNA by thymidine analogs.
    [Abstract] [Full Text] [Related] [New Search]