1.7.2.2 ? x * 61000 (NrfA) + x * 19000 (NrfH), heterooligomeric complexhas an average 2NrfA:1NrfH composition 658624 1.7.2.2 dimer - 658044 1.7.2.2 dimer crystallization data 288628 1.7.2.2 hexamer 6 * 64000, calculated from sequence analysis and spectral properties -, 672400 1.7.2.2 hexamer determination of the oligomeric composition of NiR by small-angle X-ray scattering, overview 696159 1.7.2.2 homodimer - 671934 1.7.2.2 monomer 1 * 55000, SDS-PAGE 288630 1.7.2.2 monomer 1 * 56196, electrospray ionization, consistent with the mass of the polypeptide chain plus the five heme cofactors but no calcium ion -, 765066 1.7.2.2 monomer 1 * 57000, SDS-PAGE 288627 1.7.2.2 monomer 1 * 69000, SDS-PAGE -, 288626 1.7.2.2 additional information the enzyme crystallizes as a dimer but remains monomeric in solution -, 765066 1.7.2.2 oligomer 4 * 55000 + 1 * 22000, gel filtration 288630 1.7.2.2 oligomer ccNiR 's threedimensional structure shows the characteristically close packing of heme cofactors into parallel and perpendicular motifs 696247 1.7.2.2 polymer x * 56000 + x * 18000, gel filtration 288631