1.7.7.1 ? x * 63000, SDS-PAGE 726101 1.7.7.1 ? x * 63700, calculated 726450 1.7.7.1 dimer 1 * 58000 + 1 * 66000, SDS-PAGE 394430 1.7.7.1 dimer 1 * 63000 + 1 * 25000, SDS-PAGE 394394 1.7.7.1 dimer 1 * 64000 + 1 * 35000, SDS-PAGE 394409 1.7.7.1 monomer - 208103, 394387 1.7.7.1 monomer 1 * 54000 SDS-PAGE 394388 1.7.7.1 monomer 1 * 60000 SDS-PAGE 394389 1.7.7.1 monomer 1 * 63000 SDS-PAGE + mercaptoethanol 394413 1.7.7.1 monomer 1 * 63000, SDS-PAGE 660264 1.7.7.1 monomer 1 * 66000 -, 727542 1.7.7.1 monomer 1 * 68000 SDS-PAGE 394401 1.7.7.1 monomer SDS-PAGE 394399 1.7.7.1 additional information spinach: the native enzyme with a molecular weight of 85000 can be split into a modified form with a MW of 61000 that retains activity with the non-physiological electron-donor methyl viologen, but loses most of the ferredoxin-linked activity and an 24000 MW coupling protein fragment in which the ferredoxin-binding domain is located 394408, 394411