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- W2893762208 abstract "Bacteriophage T7 uses the thioredoxin of its host, Escherichia coli, to enhance the processivity of its DNA polymerase, a requirement for the growth of phage T7. The evolutionarily conserved structure and high degree of homology of amino acid sequence of the thioredoxin family imply that homologues from other organisms might also interact with T7 DNA polymerase to support the phage growth. Despite the structural resemblance, human thioredoxin, whose X-ray crystallographic structure overlaps with that of the E. coli protein, cannot support T7 phage growth. It does not form a complex with T7 DNA polymerase as determined by surface plasmon resonance and thus does not increase the processivity. Homologous scanning analysis using this nonfunctional homologue reveals that the 60 N-terminal and the 12 C-terminal amino acid residues of E. coli thioredoxin can be substituted for its human counterpart without significantly affecting phage growth. Comparison of chimeric thioredoxins, followed by site-directed mutagenesis, identifies leucine 95 as a critical element. This residue may contribute to hydrophobic interactions with the thioredoxin-binding loop of the polymerase; levels of DNA binding and thus nucleotide polymerization are significantly decreased in the absence of this residue. The results suggest that the specific interactions at the interface of thioredoxin and DNA polymerase, rather than the overall structure, are important in the interactions that promote high processivity." @default.
- W2893762208 created "2018-10-05" @default.
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- W2893762208 date "2018-09-28" @default.
- W2893762208 modified "2023-10-18" @default.
- W2893762208 title "Hydrophobic Residue in <i>Escherichia coli</i> Thioredoxin Critical for the Processivity of T7 DNA Polymerase" @default.
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- W2893762208 doi "https://doi.org/10.1021/acs.biochem.8b00341" @default.
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