Chaperone complex formation of the transcription factor MalR involved in maltose utilization and amylolytic enzyme production in Aspergillus oryzae

Yui Konno, Kuta Suzuki, Mizuki Tanaka, Takahiro Shintani, Katsuya Gomi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The Zn2Cys6-type transcription factor MalR controls the expression of maltose-utilizing (MAL) cluster genes and the production of amylolytic enzymes in Aspergillus oryzae. In the present study, we demonstrated that MalR formed a complex with Hsp70 and Hsp90 chaperones under non-inducing conditions similar to the yeast counterpart Mal63 and that the complex was released from the chaperone complex after the addition of the inducer maltose. The MalR protein was constitutively localized in the nucleus and mutation in both the putative nuclear localization signals (NLSs) located in the zinc finger motif and the C-terminal region resulted in the loss of nuclear localization. This result indicated the involvement of NSLs in the MalR nuclear localization. However, mutation in both NLSs did not affect the dissociation mode of the MalR-Hsp70/Hsp90 complex, suggesting that MalR activation induced by maltose can occur regardless of its intracellular localization.

Original languageEnglish
Pages (from-to)827-835
Number of pages9
JournalBioscience, Biotechnology and Biochemistry
Volume82
Issue number5
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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