Kars, GökhanAlparslan, Ümmühan2020-03-262020-03-2620141310-28181314-3530https://dx.doi.org/10.1080/13102818.2014.978170https://hdl.handle.net/20.500.12395/30901The pathways for synthesis of 5-aminolevulinic acid (5-ALA) use either succinyl-CoA and glycine (C-4 pathway), or glutamate (C-5 pathway). Although Rhodobacter sphaeroides synthesizes 5-ALA through the C-4 pathway, it also has the genes coding for the enzymes of the C-5 pathway, except for glutamyl-tRNA reductase. The glutamyl-tRNA reductase gene was cloned from Rhodospirillum rubrum and expressed in R. sphaeroides; thus, the C-5 pathway was enabled to function upon assembling all the required genes. Consequently, a new and unique bacterial strain producing more 5-ALA was developed. Biohydrogen was also produced in the same bioprocess within a biorefinery approach using sugar beet molasses as substrate. The amount of 5-ALA produced by the modified strain was 25.9mg/g dry cell weight (DCW), whereas the wild-type strain produced 12.4mg/g DCW. In addition, the amount of H-2 generated by the modified and wild-type cells, respectively, was 0.92 L/L culture and 1.05 L/L culture.en10.1080/13102818.2014.978170info:eu-repo/semantics/openAccessheterologous expressionglutamyl-tRNA reductaseaminolevulinic acidbiohydrogenRhodobacter sphaeroides O.U.001Article2861034104126740781Q3WOS:000348931600007Q4