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Enzymatic Complex: DNA polymerase III |
Structure of DNA polymerase III in Escherichia coli strain K-12 substr. MG1655:
| Protein components | RNA components | Enzymatic components | Cofactors |
|
HolD HolC DnaN |
Core of polimerase III [Proteins in the complex: DnaE , DnaQ , HolE , ] DnaX complex |
| DNA polymerase III holoenzyme is the primary enzyme complex involved in prokaryotic DNA replication. It was discovered by Thomas Kornberg (son of Arthur Kornberg) and Malcolm Gefter in 1970. The complex has high processivity (i.e. the number of nucleotides added per binding event) and, specifically referring to the replication of the E.coli genome, works in conjunction with four other DNA polymerases (Pol I, Pol II, Pol IV, and Pol V). Being the primary holoenzyme involved in replication activity, the DNA Pol III holoenzyme also has proofreading capabilities that correct replication mistakes by means of exonuclease activity working 3'->5'. DNA Pol III is a component of the replisome, which is located at the replication fork. |
Last modification of this entry: Aug. 12, 2010.
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