Oberegger H, Schoeser M, Zadra I, Schrettl M, Parson W, Haas H. Regulation of freA, acoA, lysF, and cycA expression by iron availability in Aspergillus nidulans.
Appl Environ Microbiol 2002;
68:5769-72. [PMID:
12406779 PMCID:
PMC129941 DOI:
10.1128/aem.68.11.5769-5772.2002]
[Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In the filamentous fungus Aspergillus nidulans, iron homeostasis is regulated at the transcriptional level by the negative-acting GATA factor SREA. In this study the expression of a putative heme-containing metalloreductase-encoding gene, freA, was found to be upregulated by iron limitation independently of SREA, demonstrating the existence of an iron-regulatory mechanism which does not involve SREA. In contrast to freA, various other genes encoding proteins in need of iron-containing cofactors-acoA, lysF, and cycA-were downregulated in response to iron depletion. Remarkably, SREA deficiency led to increased expression of acoA, lysF, and cycA under iron-replete growth conditions.
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