Can constrain negative DNA supercoils. May be involved in maintaining the integrity of the genome at high temperature. Highly stable from pH 0 to pH 12. Hyperthermostable. Monomer. Lys-63 was found to be 25% monomethylated and Lys-64 was found to be 36% monomethylated. 7e possesses the tighter binding as compared to that of the proteins 7a and 7b, which may be due to the three supplementary lysines in the C-terminal region. Belongs to the 7 kDa DNA-binding/endoribonuclease P2 family.