5.1.3.37 ? x * 57700, calculated 733462 5.1.3.37 ? x * 57700, calculated, x * 79000, SDS-PAGE 734129 5.1.3.37 ? x * 60000, preform, x * 55000, mature protein, SDS-PAGE -, 734053 5.1.3.37 monomer 1 * 120000, SDS-PAGE 733608, 733609 5.1.3.37 additional information enzyme is composed of repeats of two protein modules designated A (385 amino acids) and R (153 amino acids). The modular structure of isoform AlgE1 is A1R1R2R3A2R4. AlgE1 has two catalytic sites for epimerization, each site introducing a different G distribution pattern 734060 5.1.3.37 additional information purified recombinant His-tagged catalytic domain peptide mass fingerprinting 747915 5.1.3.37 additional information the alginate epimerases display a modular structure composed of one or two catalytic A-modules and from one to seven R-modules having an activating effect on the A-module, NMR structure of overall structure of AlgE4 (AR) using small angle x-ray scattering. Small angle x-ray scattering analyses of AlgE4 and AlgE6 show an overall elongated shape with some degree of flexibility between the modules for both enzymes 748180 5.1.3.37 additional information the alginate epimerases display a modular structure composed of one or two catalytic A-modules and from one to seven R-modules having an activating effect on the A-module, NMR structure of the individual R-modules from AlgE6 (AR1R2R3) and the overall structure of AlgE6 using small angle x-ray scattering, PDB IDs 2ML1, 2ML2, and 2ML3. The AlgE6 R-modules fold into an elongated parallel beta-roll with a shallow, positively charged groove across the module. Small angle x-ray scattering analyses of AlgE4 and AlgE6 show an overall elongated shape with some degree of flexibility between the modules for both enzymes 748180