Abstract
In yeast, the accumulation of unfolded proteins in the ER triggers the unfolded protein response (UPR) pathway, which is mediated by Hac1 transcription factor. Here, we characterized the function of a gene encoding Hac1 in the thermotolerant methylotrophic yeast Ogataea thermomethanolica TBRC656 (OtHAC1). OtHAC1 mRNA contains a non-canonical intron of 176 nt, which was demonstrated to be spliced by RT-PCR. To characterize the function of this gene, we compared the proteome of a Othac1 mutant with wild-type. A total of 463 proteins with differential abundance were detected. The functions of these proteins were annotated in oxidative stress, metabolic pathways, transcription, translation, and of particular interest in secretory pathway. While many intracellular proteins differentially expressed in the mutant were similar to proteins with altered expression in UPR-stressed Saccharomyces cerevisiae, two novel OtHAC1-dependent proteins (Iml1 and Npr2) were identified that are potentially involved in the regulation of autophagy. The data show that OtHAC1 is an important regulator of several different processes in O. thermomethanolica TBRC656.
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Acknowledgements
This work was supported by National Center for Genetic Engineering and Biotechnology [P-15-50638]. We are grateful to Dr. Philip J. Shaw for critically editing the manuscript. CP is thankful to the Postdoctoral Research Fellowship from National Center for Genetic Engineering and Biotechnology.
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Phithakrotchanakoon, C., Puseenam, A., Phaonakrop, N. et al. Hac1 function revealed by the protein expression profile of a OtHAC1 mutant of thermotolerant methylotrophic yeast Ogataea thermomethanolica. Mol Biol Rep 45, 1311–1319 (2018). https://doi.org/10.1007/s11033-018-4287-4
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DOI: https://doi.org/10.1007/s11033-018-4287-4