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Internalization of the Aspergillus nidulans AstA Transporter into Mitochondria Depends on Growth Conditions, and Affects ATP Levels and Sulfite Oxidase Activity

Piłsyk, Sebastian and Mieczkowski, Adam and Golan, Maciej and Wawrzyniak, Agata and Kruszewska, Joanna S. (2020) Internalization of the Aspergillus nidulans AstA Transporter into Mitochondria Depends on Growth Conditions, and Affects ATP Levels and Sulfite Oxidase Activity. International Journal of Molecular Sciences, 21 (20). ISSN 1422-0067

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Official URL: https://www.mdpi.com/1422-0067/21/20/7727

Abstract

The astA gene encoding an alternative sulfate transporter was originally cloned from the genome of the Japanese Aspergillus nidulans isolate as a suppressor of sulfate permease-deficient strains. Expression of the astA gene is under the control of the sulfur metabolite repression system. The encoded protein transports sulfate across the cell membrane. In this study we show that AstA, having orthologs in numerous pathogenic or endophytic fungi, has a second function and, depending on growth conditions, can be translocated into mitochondria. This effect is especially pronounced when an astA-overexpressing strain grows on solid medium at 37 °C. AstA is also recruited to the mitochondria in the presence of mitochondria-affecting compounds such as menadione or antimycin A, which are also detrimental to the growth of the astA-overexpressing strain. Disruption of the Hsp70–Porin1 mitochondrial import system either by methylene blue, an Hsp70 inhibitor, or by deletion of the porin1-encoding gene abolishes AstA translocation into the mitochondria. Furthermore, we observed altered ATP levels and sulfite oxidase activity in the astA-overexpressing strain in a manner dependent on sulfur sources. The presented data indicate that AstA is also involved in the mitochondrial sulfur metabolism in some fungi, and thereby indirectly manages redox potential and energy state.

Item Type:Article
Subjects:Q Science > Q Science (General)
Q Science > QR Microbiology
Divisions:Laboratory of Fungal Glycobiology
ID Code:1930
Deposited By: Dr Sebastian Piłsyk
Deposited On:21 Oct 2020 14:57
Last Modified:21 Oct 2020 14:57

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