Oligopeptides with functional activities are of current interest
in the nutraceutical and medical sectors. The development of
the biosynthetic process of oligopeptides through a nonribosomal
peptide synthetase (NRPS) system has become more
challenging. To develop a production platform for nonribosomal
peptides (NRPs), reprogramming of transcriptional
regulation of the acv gene encoded ACV synthetase (ACVS)
was implemented in Aspergillus oryzae using the CRISPRCas9
system. Awakening silent acv expression was successfully
achieved by promoter substitution. Among the three exchanged
promoters, AoPgpdA, AoPtef1, and PtPtoxA, the
replacement of the native promoter with AoPgpdA led to the
highest ACV production in A. oryzae. However, the ACV production
of the AoPGpdA strain was also dependent on the
medium composition, in which urea was the best nitrogen
source, and a C:N ratio of 20:1 was optimal for tripeptide production.
In addition to cell growth, magnesium ions are an
essential element for ACV production and might participate
in ACVS activity. It was also found that ACV was the growthassociated
product of the engineered strain that might be a result of constitutive transcriptional control by the AoPgpdA
promoter. This study offers a potential strategy for nonribosomal
ACV production using the fungal system, which is applicable
for redesigning bioactive oligopeptides with industrial
relevance.
Citations
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