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- W2008478712 abstract "The τ subunit dimerizes DNA polymerase III via interaction with the α subunit, allowing DNA polymerase III holoenzyme to synthesize both leading and lagging strands simultaneously at the DNA replication fork. Here, we report a general method to map the limits of domains required for heterologous protein-protein interactions using surface plasmon resonance. The method employs fusion of a short biotinylation sequence at either the NH2 or COOH terminus of the protein to be immobilized on streptavidin-derivatized biosensor chips. Inclusion of a hexahistidine sequence permits rapid purification and separation of the fusion protein from the endogenous Escherichia coli biotin carboxyl carrier protein. Ten deletions of the α subunit were constructed and purified by Ni2+-nitrilotriacetic acid chromatography and, when required, monomeric avidin chromatography. Each α deletion protein was captured by streptavidin immobilized on a Pharmacia Biosensor BIAcore chip, and the τ binding activity of each α deletion was analyzed using surface plasmon resonance. The τ subunit bound very tightly to a full-length amino-terminal fusion of the biotinylation sequence with α (KD ∼ 70 pM). Four additional NH2-terminal α deletion proteins (60, 240, 360, and 542 residues deleted) retained strong binding activity to the τ subunit (KD = 0.19-0.39 nM), whereas deletion of 705 residues or more from the NH2 terminus of the α subunit abolished τ binding activity. Full-length α that contained a carboxyl-terminal fusion with the biotinylation sequence bound τ strongly (KD = 0.37 nM). However, deletion of 48 amino acids from the COOH terminus totally eliminated τ binding. These results indicate that the COOH-terminal half of the α subunit is involved in τ interaction. The τ subunit dimerizes DNA polymerase III via interaction with the α subunit, allowing DNA polymerase III holoenzyme to synthesize both leading and lagging strands simultaneously at the DNA replication fork. Here, we report a general method to map the limits of domains required for heterologous protein-protein interactions using surface plasmon resonance. The method employs fusion of a short biotinylation sequence at either the NH2 or COOH terminus of the protein to be immobilized on streptavidin-derivatized biosensor chips. Inclusion of a hexahistidine sequence permits rapid purification and separation of the fusion protein from the endogenous Escherichia coli biotin carboxyl carrier protein. Ten deletions of the α subunit were constructed and purified by Ni2+-nitrilotriacetic acid chromatography and, when required, monomeric avidin chromatography. Each α deletion protein was captured by streptavidin immobilized on a Pharmacia Biosensor BIAcore chip, and the τ binding activity of each α deletion was analyzed using surface plasmon resonance. The τ subunit bound very tightly to a full-length amino-terminal fusion of the biotinylation sequence with α (KD ∼ 70 pM). Four additional NH2-terminal α deletion proteins (60, 240, 360, and 542 residues deleted) retained strong binding activity to the τ subunit (KD = 0.19-0.39 nM), whereas deletion of 705 residues or more from the NH2 terminus of the α subunit abolished τ binding activity. Full-length α that contained a carboxyl-terminal fusion with the biotinylation sequence bound τ strongly (KD = 0.37 nM). However, deletion of 48 amino acids from the COOH terminus totally eliminated τ binding. These results indicate that the COOH-terminal half of the α subunit is involved in τ interaction." @default.
- W2008478712 created "2016-06-24" @default.
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- W2008478712 date "1996-08-01" @default.
- W2008478712 modified "2023-10-16" @default.
- W2008478712 title "Biotin Tagging Deletion Analysis of Domain Limits Involved in Protein-Macromolecular Interactions" @default.
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- W2008478712 doi "https://doi.org/10.1074/jbc.271.34.20690" @default.
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