This paper describes a target sequence for a pea seed nuclear DNA-binding protein (of Pisum sativum) present at the cell expansion phase. Electromobility shift assays as well as in situ copper-phenanthroline footprinting have shown that this protein binds to an imperfect repeat sequence of the legA promoter located -404 tot -367 relative to the transcriptional start site, a region designated USR1 (- 549 tot - 316). Competition assays showed that the same or a related protein binds to USR2 located at - 833 to - 582. Another protein that does not recognize the repeat sequence as a target site binds adjacent but upstream to the repeat sequence in USR1. It is suggested that these protein-DNA interactions are initial events in the assembly of a transcriptional activation complex.
Plant Molecular Biology – Springer Journals
Published: Sep 29, 2004
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