In general, the literature data show that overexpression of PDORactivity rarely leads to direct improvement in the 1,3-PD final titer,and rather causes alteration of the by-products distribution. Therelative production of the oxidative branch metabolites of the glyc-erol catabolism pathway depends on the strain being studied. Asdescribed in Ref. [51], different Klebsiella strains vary with respectto the metabolites distribution.