Abstract
The expression of secreted proteins in filamentous fungi is down-regulated by a transcriptional feedback mechanism under endoplasmic reticulum stress, termed repression under secretion stress (RESS). To investigate the RESS mechanism, we analyzed the expression of the Taka-amylase A gene (amyB) in Aspergillus oryzae, which was depressed under secreted protein stress. We conducted a truncation and deletion analysis of the amyB promoter to identify cis-elements required for RESS. A nucleotide sequence (positions −378 to −291) without any binding sites for the transcriptional activator AmyR, which is involved in amylolytic gene expression, was required for RESS. The octamer sequence TCACGGGC (positions −307 to −300) constituted the core sequence of the upstream activating element essential for amyB down-regulation under secretion stress. Both the inactivation of AmyR and RESS contributed to the down-regulation of amyB expression under ER stress.
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Acknowledgments
We are grateful for financial support from the National Science and Technology Foundation during the 12th Five-Year Plan for Rural Development in China (Grant No. 2011AA100905), the Guangdong Provincial Department of Science and Technology Research Project (Grant No. 2012B010900028), and the National Natural Science Foundation of China (Grant No. 31100026).
Supporting information
Supplementary Table 1—Primers used for vector construction
Supplementary Table 2— Primers used for quantitative real-time PCR
Supplementary Fig. 1—Confirmation of PCR amplification specificity (a) and efficiency ( b) of the gapdh gene
Supplementary Fig. 2—Confirmation of PCR amplification specificity (a) and efficiency (b) of the hacAi gene
Supplementary Fig. 3—Confirmation of PCR amplification specificity (a) and efficiency (b) of the rml gene
Supplementary Fig. 4—Confirmation of PCR amplification specificity (a) and efficiency (b) of the amyB gene
Supplementary Fig. 5—Confirmation of PCR amplification specificity (a) and efficiency (b) of the amyR gene
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Zhou, B., Wang, C., Wang, B. et al. Identification of functional cis-elements required for repression of the Taka-amylase A gene under secretion stress in Aspergillus oryzae . Biotechnol Lett 37, 333–341 (2015). https://doi.org/10.1007/s10529-014-1691-2
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DOI: https://doi.org/10.1007/s10529-014-1691-2