In a study byZhuge et al. [50], the yqhD gene from E. coli and the dhaT genewere expressed individually and co-expressed in K. pneumoniae.There was no significant difference in the concentrations of 1,3-PD between K. pneumoniae/pEtac-dhaT and K. pneumoniae, and thefinal 1,3-PD concentration for K. pneumoniae/pEtac-yqhD (16 g/L)was lower than that of the wild-type strain.