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Nitrate Metabolism Decreases the Steroidal Alcohol Byproduct Compared with Ammonium in Biotransformation of Phytosterol to Androstenedione by Mycobacterium neoaurum

  • Xuedong WangEmail author
  • Rui Chen
  • Yuyang Wu
  • Da Wang
  • Dongzhi Wei
Article

Abstract

In biotransformation of phytosterol to 4-androstene-3,17-dione (AD) by Mycobacterium, the steroidal alcohol (such as 22-hydroxy-23,24-bisnorchol-4-ene-3-one, HBC) was a main byproduct. To weaken the accumulation of this byproduct in sterol biotransformation, ammonium was substituted by nitrate as nitrogen resource. The nitrate was utilized by Mycobacterium and led to metabolic flux shift towards AD production. The ratio of AD/HBC increased maximally from 2.1 to 5.5 and AD production increased correspondently. In the meanwhile, the nitrate metabolism resulted in the decreased intracellular redox level (NADH/NAD+) maximally by 59.5% and a slight descent tendency with the increase of the nitrate concentrations. It indicated that the nitrate utilization effectively decreased the steroidal alcohol production by regulating intracellular redox level in sterol biotransformation. These results gave an insight into the mechanism of the steroidal alcohol formation in sterol biodegradation and provided a simple strategy to regulate the metabolic distribution.

Keywords

Bioconversion Metabolic redistribution Nitrate Phytosterol Redox level 

Notes

Funding Information

This work was supported by the National Natural Science Foundation of China (31570079, 21276083).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Bioreactor EngineeringNew World Institute of Biotechnology, East China University of Science and TechnologyShanghaiChina

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