Hyaluronan production and molecular weight is enhanced in pathway-engineered strains of lactate dehydrogenase-deficient Lactococcus lactis

Metabolic Engineering Communications
Mandeep Kaur, Guhan Jayaraman

Abstract

The potential advantages of hyaluronic acid (HA) production by metabolically-engineered Lactococcus lactis is constrained by the lower molecular weight and yield of HA obtained in these strains, compared to natural producers. Earlier studies have correlated lower HA yield with excessive lactate production in L. lactis cultures (Chauhan et al., 2014). In the present study, a three-fold increase was observed in the amount as well as molecular weight of HA produced by recombinant ldh-mutant L. lactis strains. The diversion from lactate production in the ldh-mutant strains resulted in excess ethanol and acetoin production and higher NAD+/NADH ratio in these cultures. The initial NAD+/NADH ratio showed a positive correlation with HA molecular weight as well as with the HA-precursor ratio (UDP-GlcUA/UDP-GlcNAc). The influence of NAD+/NADH ratio on regulation of the concerned metabolic pathways was assessed by transcriptional analysis of key genes having putative binding sites of the NADH-binding transcriptional factor, Rex.

Citations

Apr 1, 2018·Chembiochem : a European Journal of Chemical Biology·John MandaweUlrich Schwaneberg
Sep 29, 2018·Preparative Biochemistry & Biotechnology·Cansu SunguroğluAhmet Çabuk
Feb 15, 2018·Applied Microbiology and Biotechnology·Kirubhakaran PuvendranGuhan Jayaraman
Apr 10, 2019·Polymers·Arianna FallacaraSilvia Vertuani
Aug 2, 2019·Applied Microbiology and Biotechnology·Sandra SchulteGuhan Jayaraman
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