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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Oligomerization of a MutS mismatch repair protein from Thermus aquaticus.

The MutS DNA mismatch protein recognizes heteroduplex DNAs containing mispaired or unpaired bases. We have examined the oligomerization of a MutS protein from Thermus aquaticus that binds to heteroduplex DNAs at elevated temperatures. Analytical gel filtration, cross-linking of MutS protein with disuccinimidyl suberate, light scattering, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry establish that the Taq protein is largely a dimer in free solution. Analytical equilibrium sedimentation showed that the oligomerization of Taq MutS involves a dimer-tetramer equilibrium in which dimer predominates at concentrations below 10 microM. The DeltaG(0)(2-4) for the dimer to tetramer transition is approximately -6.9 +/- 0.1 kcal/mol of tetramer. Analytical gel filtration of native complexes and gel mobility shift assays of an maltose-binding protein-MutS fusion protein bound to a short, 37-base pair heteroduplex DNA reveal that the protein binds to DNA as a dimer with no change in oligomerization upon DNA binding.[1]


  1. Oligomerization of a MutS mismatch repair protein from Thermus aquaticus. Biswas, I., Ban, C., Fleming, K.G., Qin, J., Lary, J.W., Yphantis, D.A., Yang, W., Hsieh, P. J. Biol. Chem. (1999) [Pubmed]
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