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Plant and Cell Physiology, 2004, Vol. 45, No. 2 225-231
© 2004 Oxford University Press

Short Communication

Three Arabidopsis MBF1 Homologs with Distinct Expression Profiles Play Roles as Transcriptional Co-activators

Kenichi Tsuda1,3, Toshihiro Tsuji1, Susumu Hirose2 and Ken-ichi Yamazaki1

1 Laboratory of Environmental Molecular Biology, Graduate School of Environmental Earth Science, Hokkaido University, Kita 10, Nishi 5, Kita-ku, Sapporo, 060-0810 Japan
2 Department of Developmental Genetics, National Institute of Genetics and Department of Genetics, Graduate University for Advanced Studies, Yata 1111, Mishima, 411-8540 Japan

Abstract

Multiprotein bridging factor 1 (MBF1) is known to be a transcriptional co-activator that mediates transcriptional activation by bridging between an activator and a TATA-box binding protein (TBP). We demonstrated that expression of every three MBF1 from Arabidopsis partially rescues the yeast mbf1 mutant phenotype, indicating that all of them function as co-activators for GCN4-dependent transcriptional activation. We also report that each of their subtypes shows distinct tissue-specific expression patterns and responses to phytohormones. These observations suggest that even though they share a similar biochemical function, each MBF1 has distinct roles in various tissues and conditions.

Footnotes

3 Corresponding author: E-mail, nahoken{at}ees.hokudai.ac.jp; Fax, +81-11-706-4522.


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