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Table 3 The properties of PDORs from different microbial sources

From: Key enzymes catalyzing glycerol to 1,3-propanediol

Strains Relative molecular mass (kD) Subunit relative molecular mass (kD) Specific activity (U/mg) Km (mmol/L) Optimal temperature ( °C) Optimal pH Metal ions with the enzyme activity
L. brevis 350 41–46 7.28 300 37 6.6 Fe2+, Mn2+: the enzyme activation factors
K. pneumoniae 336 42 37 18 30 9.5
C. freundii 347 43.4 11 140 37 7.7 Fe2+ or Mn2+ can make its recovery activities
E. agglomerans 355 ± 5 38.5 ± 0.5 3.42 13.7 37 7.8 Mn2+: the enzyme activation factors
K. pneumoniae DSM2026 387 41.5 9.85 55 10.0 Fe2+, Na+, NH4+, and Mn2+: auxo-action on the enzyme activity
C. butyricum 384.2 ± 31.1 42 4.51 0.17 37 9.07 Li2+, Mn2+, and Na+: the enzyme activation factors