Metabolomics approach used for understanding temperature-related pectinase activity in Bacillus licheniformis DY2.

Abstract:

:Pectinases are enzymes that catalyze pectin degradation. There is a global demand for pectinases because of their wide utility and catalytic efficiency. Optimization of the fermentation process to increase the pectolytic enzyme activity is generally practiced to lower process costs, but whether temperature influences the metabolome, enhancing pectinase activity, is not known. Here, we developed a metabolomics approach to explore it. The activity of P-DY2 pectinase produced by Bacillus licheniformis DY2 was higher in cells grown at 30°C than those grown at 37°C. Differential metabolome analysis revealed fluctuating tricarboxylic acid (TCA) cycle at 30°C. Consistently, the transcripts of TCA cycle genes and activities of pyruvate dehydrogenase and α-Ketoglutaric dehydrogenase were lower at 30°C than 37°C. Furthermore, inhibition of pyruvate dehydrogenase and succinate dehydrogenase enhanced the activity of P-DY2, supporting the conclusion that the inactivated pyruvate metabolism and TCA cycle were required for pectinase activity, and that P-DY2 was TCA cycle-independent. Collectively, these findings indicated that fermentation temperature affected P-DY2 activity by metabolic modulation, with an inactivated TCA cycle as a characteristic feature of high P-DY2 activity. More importantly, the present study highlights an approach of promoting pectinase activity through metabolic modulation by using metabolic pathway inhibitors.

journal_name

FEMS Microbiol Lett

authors

Guan Y,Yin D,Du X,Ye X

doi

10.1093/femsle/fny255

subject

Has Abstract

pub_date

2018-12-01 00:00:00

issue

23

eissn

0378-1097

issn

1574-6968

pii

5140144

journal_volume

365

pub_type

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