A dually located multi-HMG-box protein of Aspergillus nidulans has a crucial role in conidial and ascospore germination

Zoltán Karácsony, A. Gácser, C. Vágvölgyi, Claudio Scazzocchio, Z. Hamari

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Seven HMG-box proteins of Aspergillus nidulans have been identified in the genomic databases. Three of these have the characteristics of non-specific DNA-binding proteins. One of these, AN1267 (HmbB), comprises one canonical HMG-box in its C-terminus and upstream of the canonical box two structurally related boxes, to be called Shadow-HMG-boxes. This protein defines, together with the Podospora anserina mtHMG1, a clade of proteins present in the Pezizomycotina, with orthologues in some of the Taphrinomycotina. HmbB localizes primarily to the mitochondria but occasionally in nuclei. The deletion of the cognate gene results in a number of pleiotropic effects, including those on hyphal morphology, sensitivity to oxidative stress, absence of sterigmatocystin production and changes in the profile of conidial metabolites. The most striking phenotype of deletion strains is a dramatic decrease in conidial and ascospore viability. We show that this is most likely due to the protein being essential to maintain mitochondrial DNA in spores.

Original languageEnglish
Pages (from-to)383-402
Number of pages20
JournalMolecular Microbiology
Volume94
Issue number2
DOIs
Publication statusPublished - Oct 1 2014

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HMGB Proteins
Aspergillus nidulans
Germination
Sterigmatocystin
Podospora
Proteins
Gene Deletion
DNA-Binding Proteins
Spores
Mitochondrial DNA
Mitochondria
Oxidative Stress
Databases
Phenotype

ASJC Scopus subject areas

  • Molecular Biology
  • Microbiology
  • Medicine(all)

Cite this

A dually located multi-HMG-box protein of Aspergillus nidulans has a crucial role in conidial and ascospore germination. / Karácsony, Zoltán; Gácser, A.; Vágvölgyi, C.; Scazzocchio, Claudio; Hamari, Z.

In: Molecular Microbiology, Vol. 94, No. 2, 01.10.2014, p. 383-402.

Research output: Contribution to journalArticle

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