Abstract
Xylose is one of the most abundant lignocellulosic components, but it cannot be used by R. oryzae for fumaric acid production. Here, we applied high-throughput RNA sequencing to generate two transcriptional maps of R. oryzae following fermentation in glucose or xylose. The differential expression analysis showed that, genes involved in amino acid metabolism, fatty acid metabolism, and gluconeogenesis, were up-regulated in response to xylose. Moreover, we discovered the potential presence of oxidative stress in R. oryzae during xylose fermentation. To adapt to this unfavorable condition, R. oryzae displayed reduced growth and induce of a number of antioxidant enzymes, including genes involved in glutathione, trehalose synthesis, and the proteasomal pathway. These responses might divert the flow of carbon required for the accumulation of fumaric acid. Furthermore, using high-throughput RNA sequencing, we identified a large number of novel transcripts and a substantial number of genes that underwent alternative splicing. Our analysis provides remarkable insight into the mechanisms underlying xylose fermentation by R. oryzae. These results may reveal potential target genes or strategies to improve xylose fermentation.
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Acknowledgments
This work was financially supported by the National Basic Research Program of China (No. 2013CB733605), National Science Foundation for Distinguished Young Scholars of China (No. 21225626), the National High Technology Research and Development Program of China (No. 2011AA02A206 and No. 2012AA022304), the National Natural Science Foundation of China (No. 21106065), and the Excellent Doctoral Dissertation Foundation of Guangdong Province (sybzzxm201217).
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Xu, Q., Liu, Y., Li, S. et al. Transcriptome analysis of Rhizopus oryzae in response to xylose during fumaric acid production. Bioprocess Biosyst Eng 39, 1267–1280 (2016). https://doi.org/10.1007/s00449-016-1605-x
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DOI: https://doi.org/10.1007/s00449-016-1605-x