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− | <h4>Project Description</h4> | + | |
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− | Poly-γ-glutamic acid (γ-PGA) is an important, naturally occurring polyamide consisting of D/L-glutamate monomers. Unlike typical peptide linkages, the amide linkages inγ-PGA are formed between the α-amino group and the γ-carboxyl group. γ-PGA exhibits many favorable features such as biodegradable, water soluble, edible and non-toxic to humans and the environment. Therefore, it has been widely used in fields of foods, medicines, cosmetics and agriculture and many unique applications, such as a sustained release material and drug carrier, curable biological adhesive, biodegradable fibres, and highly water absorbable hydrogels.<br>
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− | Strains capable for producing γ-PGA are divided into two categories based on their requirement for glutamate acid: glutamate-dependent strains and glutamate-independent strains. Glutamate-independent strains are preferable for industrial production because of their low cost and simplified fermentation process. However, compared with glutamate-dependent strains, their lower γ-PGA productivity limits their industrial application. Therefore, the construction of a glutamate-independent strain with high γ-PGA yield is important for industrial applications. <br>
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− | <em>Bacillusamyloliquefaciens</em> LL3, isolated from fermented food, is a glutamate-independent strain, which can produce 3-4 g/L γ-PGA with sucrose as its carbon source and ammonium sulfate as its nitrogen source. The <em>B. amyloliquefaciens</em> LL3 strain was deposited in the China Center for Type Culture Collection (CCTCC) with accession number CCTCC M 208109 and its whole genome has been sequenced in 2011. In this study, we aimed to improve the γ-PGA production based on the <em>B. amyloliquefaciens </em>NK-1 strain (a derivative of LL3 strain with its endogenous plasmid and <em>upp</em> gene deleted).<br>
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− | In order to improve γ-PGA production, we employed two strategies to fine-tune the synthetic pathways and balance the metabolism in the glutamate-independent <em>B. amyloliquefaciens </em>NK-1 strain. Firstly, we constructed a metabolic toggle switch in the NK-1 strain to inhibit the expression of ODHC (2-oxoglutarate dehydrogenase complex) by adding IPTG in the stationary stage and distribute the metabolic flux more frequently to be used for γ-PGA precursor-glutamate synthesis. As scientists had found that the activity of ODHC was rather low when glutamate was highly produced in a <em>Corynebacterium glutamicum</em> strain. Second, to balance the increase of endogenous glutamate production, we optimized the expression level of <em>pgsBCA</em> genes (responsible for γ-PGA synthesis) by replacing its native promoter to seven different strength of promoters. Through these two strategies, we aimed to obtain a γ-PGA production improved mutant strain. </p>
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