5.1.3.37 additional information - additional information the Km decreases from 80 microM for substrate containing fewer than 15 residues to 4 microM for substrate containing over 100 residues, pH 7.3 733323 5.1.3.37 0.018 - [alginate]-beta-D-mannuronate pH 6.8, 37°C 734129 5.1.3.37 0.62 - [mannuronan]-beta-D-mannuronate pH 6.8, 30°C, presence of 8.6 mM Ca2+ 733609 5.1.3.37 0.9 - [mannuronan]-beta-D-mannuronate pH 6.8, 30°C, presence of 0.68 mM Ca2+ 733609