DNA replication with bacteriophage T4 proteins. Purification of the proteins encoded by T4 genes 41, 45, 44, and 62 using a complementation assay.


The proteins encoded by bacteriophage T4 genes 41, 45, 44, and 62 are ...
The proteins encoded by bacteriophage T4 genes 41, 45, 44, and 62 are known from the genetic studies of Epstein et al. ((1963) Cold Spring Harbor Symp. Quant. Biol. 28, 375--394) to be required for viral DNA synthesis. A convenient assay for each of these proteins is described which is based on the specific stimulation by each protein of DNA synthesis in extracts of Escherichia coli infected with mutants of bacteriophage T4 unable to make that protein. The T4 41 protein, 45 protein, and the complex of the 44 and 62 proteins have been highly purified. For each protein there is co-chromatography during the final purification step of (i) activity in the complementation assay, (ii) activity required for DNA synthesis with other purified T4 proteins, and (iii) a subunit of the size previously identified as that of the corresponding gene product.




Accessory Proteins/Complexes, Methods


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