[DPO3X_ECOLI] DNA polymerase III is a complex, multichain enzyme responsible for most of the replicative synthesis in bacteria. This DNA polymerase also exhibits 3' to 5' exonuclease activity. Isoform tau: serves as a scaffold to help in the dimerization of the core complex. Isoform gamma: seems to interact with the delta subunit. to transfer the beta subunit on the DNA.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The solution structure of the C-terminal Domain V of the tau subunit of E. coli DNA polymerase III was determined by nuclear magnetic resonance (NMR) spectroscopy. The fold is unique to tau subunits. Amino acid sequence conservation is pronounced for hydrophobic residues that form the structural core of the protein, indicating that the fold is representative for tau subunits from a wide range of different bacteria. The interaction between the polymerase subunits tau and alpha was studied by NMR experiments where alpha was incubated with full-length C-terminal domain (tau(C)16), and domains shortened at the C-terminus by 11 and 18 residues, respectively. The only interacting residues were found in the C-terminal 30-residue segment of tau, most of which is structurally disordered in free tau(C)16. Since the N- and C-termini of the structured core of tau(C)16 are located close to each other, this limits the possible distance between alpha and the pentameric deltatau2gammadelta' clamp-loader complex and, hence, between the two alpha subunits involved in leading- and lagging-strand DNA synthesis. Analysis of an N-terminally extended construct (tau(C)22) showed that tau(C)14 presents the only part of Domains IVa and V of tau which comprises a globular fold in the absence of other interaction partners.
Solution structure of Domains IVa and V of the tau subunit of Escherichia coli DNA polymerase III and interaction with the alpha subunit.,Su XC, Jergic S, Keniry MA, Dixon NE, Otting G Nucleic Acids Res. 2007;35(9):2825-32. Epub 2007 Apr 22. PMID:17452361[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑Su XC, Jergic S, Keniry MA, Dixon NE, Otting G. Solution structure of Domains IVa and V of the tau subunit of Escherichia coli DNA polymerase III and interaction with the alpha subunit. Nucleic Acids Res. 2007;35(9):2825-32. Epub 2007 Apr 22. PMID:17452361 doi:10.1093/nar/gkm080
