The putative stress sensor protein MtlA is required for conidia formation, cell wall stress tolerance, and cell wall integrity in Aspergillus nidulans

The Mid2-like protein MtlA is a putative sensor of the cell wall integrity (CWI) signaling pathway in Aspergillus nidulans. An MtlA-EGFP fusion protein was localized at the cell surface and septa. The mtlA disruptant (∆mtlA) showed radial colony growth similar to the wild-type (wt) strain, but showe...

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Published in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2014-02, Vol.78 (2), p.326-335
Main Authors: Futagami, Taiki, Seto, Kazufumi, Kajiwara, Yasuhiro, Takashita, Hideharu, Omori, Toshiro, Takegawa, Kaoru, Goto, Masatoshi
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Aspergillus nidulans
Aspergillus nidulans - cytology
Aspergillus nidulans - metabolism
Aspergillus nidulans - physiology
Cell Wall - metabolism
cell wall integrity
Fungal Proteins - chemistry
Fungal Proteins - metabolism
MtlA
Protein Transport
Sequence Homology, Amino Acid
Spores, Fungal - physiology
stress sensor
Stress, Physiological
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Summary:The Mid2-like protein MtlA is a putative sensor of the cell wall integrity (CWI) signaling pathway in Aspergillus nidulans. An MtlA-EGFP fusion protein was localized at the cell surface and septa. The mtlA disruptant (∆mtlA) showed radial colony growth similar to the wild-type (wt) strain, but showed reduced conidia formation. The ∆mtlA mutant showed growth deficiency in the presence of inhibitors of cell wall synthesis. Moreover, mtlA disruption resulted in a reduction in the glucan and chitin content in the cell wall. These results suggest that MtlA plays a significant role in asexual sporulation, cell wall stress tolerance, and the maintenance of CWI in A. nidulans, but transcriptional upregulation of α-1,3-glucan synthase gene agsB induced by micafungin was observed in the ∆mtlA strain as well as the wt strain. Thus, MtlA is not essential for activation of the downstream CWI signaling pathway components identified in previous studies of Saccharomyces cerevisiae. The MtlA is a putative sensor protein of the cell wall integrity signaling pathway and required for conidia formation and cell wall stress tolerance in Aspergillus nidulan
ISSN:0916-8451
1347-6947
DOI:10.1080/09168451.2014.878218