2.5.1.1 ? x * 38000, SDS-PAGE 739121 2.5.1.1 ? x * 40000, SDS-PAGE of recombinant protein 706332 2.5.1.1 ? x * 49400, calculated from amino acid sequence 739532 2.5.1.1 dimer 2 * 45800, the enzyme is always present as a dimer regardless of the added cofactor, in the case of Mg2+, the dimeric protein possesses the largest volume (93800 Da), most likely due to a more relaxed conformation. With Co2+, the enzyme seems to have a more compact conformation (87600 Da), which may be responsible for the change in product spectrum calculated from sequence 723664 2.5.1.1 heterodimer - 722845 2.5.1.1 heterotetramer - 737310 2.5.1.1 homodimer - 739388 2.5.1.1 homotetramer 4 * 39600, SDS-PAGE -, 738211 2.5.1.1 tetramer enzyme forms a heterotetramer of two catalytic large plus two regulatory small subunits, crystallization data. 706227