Journal
JOURNAL OF GENERAL AND APPLIED MICROBIOLOGY
Volume 54, Issue 6, Pages 343-351Publisher
MICROBIOL RES FOUNDATION
DOI: 10.2323/jgam.54.343
Keywords
Aspergillus oryzae; cellulase; premature polyadenylation; termite
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Funding
- New Energy and Industrial Technology Development Organization (NEDO)
- Bio-oriented Technology Research Advancement Institution (BRAIN), Japan
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To achieve high expression of glycoside hydrolase family 45 endoglucanase (RsSym45EG1) from a symbiotic protist of the termite Reticulitermes speratus, synthetic sequence RsSym45eg1-co, in which the codon usage was adjusted to that of the highly-expressed tef1 gene encoding translation elongation factor la, was prepared and introduced into A. oryzae. The transcript level of RsSym45eg1-co was 1.8-fold higher than that of RsSym45eg1. In cells harboring RsSym45eg1, but not RsSym45eg1-co, truncated transcripts in which the coding region was prematurely terminated and followed by a poly A chain were found. The production of endoglucanase in the culture supernatant was improved by codon optimization. Truncated transcripts were also found when cellobiohydrolase and P-glucosidase from R. speratus symbionts were expressed, and the transcript level of the former was increased by codon-optimization. Our findings suggest that premature polyadenylation frequently occurs in heterologous protein expression in A. oryzae, which might result in the poor yield of expressed proteins.
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