Investigating the effect of carbon source on rabies virus glycoprotein production in Pichia pastoris by a transcriptomic approach.

Abstract:

:Several factors affect protein expression in Pichia pastoris, one among them is the carbon source. In this work, we studied the effect of this factor on the expression level of rabies virus glycoprotein (RABV-G) in two recombinant clones harboring seven copies of the gene of interest. The expression was driven either by the constitutive glyceraldehyde-3-phosphate dehydrogenase (GAP) promoter or the inducible alcohol oxidase1 (AOX1) promoter. Clones were compared in terms of cell physiology and carbon source metabolism. The transcription levels of 16 key genes involved in the central metabolic pathway, the methanol catabolism, and the oxidative stress were investigated in both clones. Cell size, as a parameter reflecting cell physiological changes, was also monitored. Our results showed that when glucose was used as the sole carbon source, large cells were obtained. Transcript levels of the genes of the central metabolic pathway were also upregulated, whereas antioxidative gene transcript levels were low. By contrast, the use of methanol as a carbon source generated small cells and a shift in carbon metabolism toward the dissimilatory pathway by the upregulation of formaldehyde dehydrogenase gene and the downregulation of those of the central metabolic. These observations are in favor of the use of glucose to enhance the expression of RABV-G in P. pastoris.

journal_name

Microbiologyopen

journal_title

MicrobiologyOpen

authors

Ben Azoun S,Kallel H

doi

10.1002/mbo3.489

subject

Has Abstract

pub_date

2017-08-01 00:00:00

issue

4

issn

2045-8827

journal_volume

6

pub_type

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