Increasing sodium lactate production by enhancement of Na+ transmembrane transportation in Pediococcus acidilactici.

Niling He, Chun Fang, Zhongyang Qiu, Jie Bao

Bioresource technology 2021 Mar

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Fermentative production of sodium lactate generally is a low efficient process because of the high Na+ osmatic stress on lactic acid bacterium cells. In this study, the homogeneous genes encoding Na+/H+ antiporters were screened and overexpressed in Pediococcus acidilactici for the enhancement of Na+ transmembrane transportation. The function of the gene RS02775 was identified and its overexpressing in P. acidilactici resulted in the significantly improved sodium lactate production. The recombinant not only accelerated the sugar consumption, but also achieved the record high titer of sodium lactate by 121.1 g/L using pure sugars and 132.4 g/L using wheat straw. The transcription analysis shows that the overexpression of Na+/H+ antiporter significantly upregulated the transcription of the sugar phosphorylation genes of P. acidilactici under high Na+ stress. This study provides an effective method for high titer production of sodium lactate using both pure sugars and lignocellulose feedstocks. Copyright © 2020 Elsevier Ltd. All rights reserved.

Citation

Niling He, Chun Fang, Zhongyang Qiu, Jie Bao. Increasing sodium lactate production by enhancement of Na+ transmembrane transportation in Pediococcus acidilactici. Bioresource technology. 2021 Mar;323:124562