NDLI: TGA1 and G-box binding factors: two distinct classes of Arabidopsis leucine zipper proteins compete for the G-box-like element TGACGTGG.

Content Provider	PubMed Central
Author	Schindler, U. Beckmann, H. Cashmore, A. R.
Abstract	Regulatory elements containing the sequence ACGT are found in several plant promoters and are recognized by various basic/leucine zipper (bZIP) proteins. The Arabidopsis G-box binding factor 1 (GBF1), initially identified by its ability to bind to the palindromic G-box (CCACGTGG), also interacts with the TGACGT motif if this hexamer sequence is followed by either the dinucleotide GG--as found in the Hex motif of the wheat histone 3 promoter--or GT. Here we describe the isolation of an Arabidopsis bZIP protein, denoted TGA1, that also recognizes ACGT-containing sequences. However, TGA1 differs from members of the GBF family in the spectrum of base pair permutations flanking the ACGT sequence that are required for DNA binding. TGA1 primarily requires a TGACG motif and preferentially binds to those pentamers that are followed by a T residue. We show that although both TGA1 and GBF1 bind to the Hex motif (TGACGTGG), this binding can be distinguished on the basis of their specific DNA-protein contacts. Furthermore, TGA1 also differs from members of the GBF family in that it apparently does not form heterodimers with any member of this family.
Related Links	http://dx.doi.org/10.1105/tpc.4.10.1309
Ending Page	1319
Page Count	11
Starting Page	1309
File Format	PDF
ISSN	10404651
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	10
Volume Number	4
Language	English
Publisher Date	1992-10-01
Access Restriction	Open
Subject Keyword	Plant Science Cell Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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