3.4.19.15 monomer 1 * 16771, calculated from sequence, MALTI-TOF, the negative surface charge of the enzyme may account for the 1000 Da discrepancy between the molecular mass of the enzyme estimated by SDS-PAGE compared to its theoretical molecular mass -, 730410 3.4.19.15 monomer 1 * 26000, SDS-PAGE, the negative surface charge of the enzyme may account for the 1000 Da discrepancy between the molecular mass of the enzyme estimated by SDS-PAGE compared to its theoretical molecular mass -, 730410