– Binds and compacts DNA (95 to 150 base pairs) to form nucleosome-like structures that contain positive DNA supercoils. Increases the resistance of DNA to thermal denaturation in vitro. HMf-2 Protein, Methanothermus fervidus, Recombinant (His) is expressed in E. coli expression system with N-6xHis tag. The predicted molecular weight is 11.7 kDa and the accession number is P19267.