UvsY is the phage T4 recombination mediator protein, and structural and biophysical studies provide insights into its role in T4 homologous recombination. During T4 homologous recombination, the UvsX recombinase must compete with the prebound gp32 single-stranded binding protein for DNA-binding sites and T4 UvsY Protein stimulates this filament nucleation event (1). UvsY is a 15.8-kDa protein with properties that are consistent with its role as mediator; it stimulates the DNA-dependent ATPase activity of UvsX, lowers the critical concentration of UvsX that is required for activity, and promotes strand exchange (2, 3). UvsY efficiently promotes the UvsX-catalyzed strand invasion reaction by recruiting to ssDNA–gp32 complexes, promotes the release of gp32, and favors the binding of UvsX.

Protein PurityThe physical purity of this enzyme is ≥98% as assessed by SDS-PAGE with Coomassie® blue staining (Fig. 1).

Product SourceE. coli BL21 (DE3) strain expressing T4 UvsY gene with an N-terminal His-tag.This His tag does not have any effect on UvsY activity.

Product IncludesUvsY protein10X UvsY Reaction Buffer

1x UvsY reaction buffer composition20 mM Tris-acetate100 mM Potassium acetate10 mM Magnesium acetate1 mM DTTpH 7.8 @ 25ºC

Storage Buffer50 mM Tris-HCl50 mM KCl1 mM DTT0.1 mM EDTA50% GlycerolpH 7.5 @ 25ºC

Storage Temperature-20ºC

Quality Control assaysUvsY is free from detectable nuclease activities.

References1. Beernink HT, Morrical SW. RMPs: Recombination/replication mediator proteins. Trends Biochem Sci. 1999;24(10):385–389.2. Hashimoto K, Yonesaki T. The characterization of a complex of three bacteriophage T4 recombination proteins, uvsX protein, uvsY protein, and gene 32 protein, on single-stranded DNA. J Biol Chem. 1991;266(8):4883–4888.3. Beernink HT, Morrical SW. The uvsY recombination protein of bacteriophage T4 forms hexamers in the presence and absence of single-stranded DNA. Biochemistry. 1998;37(16):5673–56813572 3575