Abstract
In analogy to the Escherichia coli replicative DNA polymerase III we define two forms of DNA polymerase alpha: the core enzyme and the holoenzyme. The core enzyme is not able to elongate efficiently primed single-stranded DNA templates, in contrast to the holoenzyme which functions well on in vivo-like template. Using these criteria, we have identified and partially purified DNA polymerase alpha holoenzyme from calf thymus and have compared it to the corresponding homogeneous DNA polymerase alpha (defined as the core enzyme) from the same tissue. The holoenzyme is able to use single-stranded parvoviral DNA and M13 DNA with a single RNA primer as template. The core enzyme, on the other hand, although active on DNAs treated with deoxyribonuclease to create random gaps, is unable to act on these two long, single-stranded DNAs. E. coli DNA polymerase III holoenzyme also copies the two in vivo-like templates, while the core enzyme is virtually inactive. The homologous single-stranded DNA-binding proteins from calf thymus and from E. coli stimulate the respective holoenzymes and inhibit the core enzymes. These results suggest a cooperation between a DNA polymerase holoenzyme and its homologous single-stranded DNA-binding protein. The prokaryotic and the mammalian holoenzyme behave similarly in several chromatographic systems.
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