Download MendeleyMechanistic investigation of a D to N mutation in DAHP synthase that dictates carbon flux into the shikimate pathway in yeast.
Liu, H., Xiao, Q., Wu, X., Ma, H., Li, J., Guo, X., Liu, Z., Zhang, Y., Luo, Y.(2023) Commun Chem 6: 152-152
- PubMed: 37454208
- DOI: https://doi.org/10.1038/s42004-023-00946-x
- Primary Citation of Related Structures:
7YKC - PubMed Abstract:
3-deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHPS) is a key enzyme in the shikimate pathway for the biosynthesis of aromatic compounds. L -Phe and L -Tyr bind to the two main DAHPS isoforms and inhibit their enzyme activities, respectively. Synthetic biologists aim to relieve such inhibitions in order to improve the productivity of aromatic compounds. In this work, we reported a point mutant of yeast DHAPS, Aro3 D154N , which retains the wild type enzyme activity but converts it highly inert to the inhibition by L -Phe. The Aro3 crystal structure along with the molecular dynamics simulations analysis suggests that the D154N mutation distant from the inhibitor binding cavity may reduce the binding affinity of L -Phe. Growth assays demonstrated that substitution of the conserved D154 with asparagine suffices to relieve the inhibition of L -Phe on Aro3, L -Tyr on Aro4, and the inhibitions on their corresponding homologues from diverse yeasts. The importance of our discovery is highlighted by the observation of 29.1% and 43.6% increase of yield for the production of tyrosol and salidroside respectively upon substituting ARO3 with ARO3 D154N . We anticipate that this allele would be used broadly to increase the yield of various aromatic products in metabolically diverse microorganisms.
Organizational Affiliation:
Frontiers Science Center of Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
