Thymidine-phosphorylating Activity in γ-Plantlets

Thymidine-phosphorylating Activity in gamma-Plantlets: Separation of Onset of Activity from Deoxyribonucleic Acid Synthesis.

Thymidine-phosphorylating capacity, mediated by thymidine kinase or a nucleoside phosphotransferase, is closely correlated with DNA synthesis and cell division in a wide variety of bacterial, animal, and plant systems (4, 5, 11, 14, 17, 22). In cells that are not undergoing DNA synthesis and cell division, these enzymes are usually low or undetectable. Conversely, systems undergoing rapid DNA s...

Properties of Uridine and Thymidine Phosphorylating Enzymes of Zea Mays

The studies support the previous conclusion that two uridine phosphorylating enzymes exist during germination of Zea mays, of which only one is active in vitro during the initial 48 hours of germination. The early appearing enzyme is less heat stable and of higher molecular weight than the second one, which becomes active after this time. The evidence presented indicates that the second enzyme ...

Mitochondrial thymidine-deoxyuridine-phosphorylating activity and the replication of mitochondrial DNA.

Properties of uridine and thymidine phosphorylating enzymes of Zea mays.

The studies support the previous conclusion that two uridine phosphorylating enzymes exist during germination of Zea mays, of which only one is active in vitro during the initial 48 hours of germination. The early appearing enzyme is less heat stable and of higher molecular weight than the second one, which becomes active after this time. The evidence presented indicates that the second enzyme ...

Thymidine uptake, thymidine incorporation, and thymidine kinase activity in marine bacterium isolates.

One assumption made in bacterial production estimates from [3H]thymidine incorporation is that all heterotrophic bacteria can incorporate exogenous thymidine into DNA. Heterotrophic marine bacterium isolates from Tampa Bay, Fla., Chesapeake Bay, Md., and a coral surface microlayer were examined for thymidine uptake (transport), thymidine incorporation, the presence of thymidine kinase genes, an...