Materials and methods for controlling regulation in biosynthesis in species of the genera Ralstonia or Cupriavidus and organisms related thereto

A method for increasing carbon-based chemical product yield in an organism, said method comprising modulating activity of one or more polypeptides or functional fragments thereof involved in a stringent response and/or in a regulatory network of an organism selected from a species of Cupriavidus or Ralstonia with diminished polyhydroxybutyrate synthesis, thereby increasing carbon-based chemical product yield in the organism as compared to an organism without said modulated polypeptide activity, wherein the one or more polypeptides or functional fragments thereof is encoded by a gene having at least 90% sequence identity to a gene selected from the FadP gene of SEQ ID NO:19 encoding FadP polypeptide having fatty acid synthesis activity, the PsrA gene of SEQ ID NO:51 encoding PsrA polypeptide having fatty acid degradation activity or the LIdR gene of SEQ ID NO:53 encoding LIdR polypeptide having lactate dehydrogenase activity.