Alkaline pH shock enhanced production of validamycin A in fermentation of Streptomyces hygroscopicus.

Abstract

Validamycin A (Val-A) is produced by Streptomyces as a secondary metabolite with wide agricultural applications of controlling rice sheath blight, false smut and damping-off diseases. The effect of alkaline pH shock on enhancing Val-A production and its mechanism were investigated. A higher yield of Val-A was achieved by NaOH shock once or several times together with faster protein synthesis and sugar consumption and alkaline pH shock can increase Val-A production by 27.43%. Transcription of genes related to amino acid metabolism, carbon metabolism and electron respiratory chain was significantly up-regulated, accompanied by the substantial increase of respiratory activity and glutamate concentration. Val-A production was promoted by a series of complex mechanisms and made a response to pH stress signal, which led to the enhancement of glutamate metabolism and respiration activity. The obtained information will facilitate future studies for antibiotic yield improvement and the deep revealment of molecular mechanism.

• Authors: Jing Jiang, Ya-Fang Sun, Xi Tang, Chao-Nan He, Ye-Lin Shao, Ya-Jie Tang, Wen-Wen Zhou
• Journal: Bioresource technology (Bioresour Technol) Vol. 249 Pg. 234-240 (Feb 2018) ISSN: 1873-2976 [Electronic] England
• PMID: 29045927 (Publication Type: Journal Article)
• Copyright: Copyright © 2017 Elsevier Ltd. All rights reserved.

Chemical References

• validamycin A
• Inositol
• Carbon

Topics

• Carbon
• Fermentation
• Inositol (analogs & derivatives)
• Streptomyces