dnaQ is the gene encoding the ε subunit of DNA polymerase III in Escherichia coli. [1] The ε subunit is one of three core proteins in the DNA polymerase complex. It functions as a 3’→5’ DNA directed proofreading exonuclease that removes incorrectly incorporated bases during replication.

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The Escherichia coli dnaQ gene encodes the 3′→5′ exonucleolytic proofreading (ɛ) subunit of DNA polymerase III (Pol III). Genetic analysis of dnaQ mutants has suggested that ɛ might consist of two domains, an N-terminal domain containing the ...

2023年9月11日 · Here, we characterized the spacer acquisition of the adaptation module of the Streptococcus thermophilus type I-E system, in which a DnaQ domain naturally fuses with Cas2. We presented X-ray crystal structures and cryo-electron …

2002年5月1日 · In this review, we first discuss the proofreading functions of 3′–5′ exonucleases, and then describe the more recently discovered enzymes with 3′–5′ exonuclease activity, the functional roles of...

2015年4月15日 · The dnaQ gene of Escherichia coli encodes the ε subunit of DNA polymerase III, which provides the 3′ → 5′ exonuclease proofreading activity of the replicative polymerase. Prior studies have shown that loss of ε leads to high mutation frequency, partially constitutive SOS, …

1999年10月15日 · Here we report the discovery and characterization of a new E. coli exonuclease, exonuclease X. Exonuclease X is a member of a superfamily of proteins that have homology to the 3′-5′ exonuclease proofreading subunit (DnaQ) of E. coli DNA polymerase III.

2023年10月24日 · We demonstrated that mycobacterial DnaQ binds to the b-clamp and functions synergistically with the PHP domain to correct replication errors. Further, we found that the mycobacterial DnaQ sustains replicative fidelity upon chromosome topological stress.

1996年4月2日 · The Escherichia coli dnaQ gene encodes the proofreading 3' exonuclease (epsilon subunit) of DNA polymerase III holoenzyme and is a critical determinant of chromosomal replication fidelity.

The nucleotide sequences of the recessive dnaQ49 and the dominant mutD5 mutator were determined. The dnaQ49 mutator has a single base substitution in the dnaQ gene, thus causing one amino acid change, 96Val (GTG)----Gly (GGG), in the DnaQ protein (epsilon subunit of DNA polymerase III holoenzyme).