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Characterization of a Monosaccharide Transporter mstB Isolated as a Downstream Gene of MsnA in Aspergillus nidulans  

Jeon, Mee-Hyang (Department of Biochemistry, Paichai University)
Chae, Suhn-Kee (Department of Biochemistry, Paichai University)
Publication Information
Korean Journal of Microbiology / v.47, no.4, 2011 , pp. 281-288 More about this Journal
Abstract
To screen downstream genes of Aspergillus nidulans MsnA showing amino acid sequence similarity to the zinc finger region of Msn2/4 stress response transcription factors in Saccharomyces cerevisiae, differentially expressed genes (DEG) in MsnA overexpressed or msnA null mutant strains compared to wild type have been isolated. The cognate gene IDs were identified by DNA sequencing of the selected DEGs. Among those, DEG6 was known as mstB encoding a putative monosaccharide transporter. Expression level of mstB mRNA was increased in MsnA overproducing strains and MsnA bound directly to the promoter region of mstB in vitro. MstB containing twelve transmembrane domains exhibited 80% of amino acid sequence identities to A. niger MstA a high-affinity monosaccharide transporter. A null mutant of mstB was phenotypically undistinguishable to wild type. On the other hand, forced overexpression of MstB caused the increased formation of sexual structure cleistothecia in 0.1% glucose condition where wild type showed almost no cleistothecia. This result implies that mstB is involved in transport of monosaccharide required for sexual differentiation.
Keywords
Aspergillus nidulans; msnA; mstB; monosaccharide transporter; sexual development;
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