Has ATPase and non-specific DNA-binding activities. May be involved in recombination and/or recombinational repair. Not involved in mismatch repair. Divalent metal cation. Highest activity with cobalt or manganese. Optimum temperature is 90 degrees Celsius for ATPase and DNA-binding activities. Multimer. Belongs to the DNA mismatch repair MutS family. Archaeal Muts2 subfamily.