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Behringer, C.* ; Bastakis, E.* ; Ranftl, Q.* ; Mayer, K.F.X. ; Schwechheimer, C.*

Functional diversification within the family of B-GATA transcription factors through the LLM-domain.

Plant Physiol. 166, 293-305 (2014)
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Open Access Green as soon as Postprint is submitted to ZB.
The transcription of the Arabidopsis thaliana GATA transcription factors GNC and GNL/CGA1 is controlled by several growth regulatory signals including light and the phytohormones auxin, cytokinin, and gibberellin. To date, GNC and GNL have been attributed functions in the control of germination, greening, flowering time, floral development, senescence, and floral organ abscission. GNC and GNL belong to the eleven-membered family of B-class GATA transcription factors that are characterized to date solely by their high sequence conservation within the GATA DNA-binding domain. The degree of functional conservation among the various B-class GATA family members is not understood. Here, we identify and examine B-class GATAs from Arabidopsis, tomato, Brachypodium, and barley. We find that B-class GATAs from these four species can be subdivided based on their short or long N-termini and the presence of the thirteen amino acid C-terminal LLM-domain with the conserved motif leucine-leucine-methionine (LLM). Through overexpression analyses and by complementation of a gnc gnl double mutant, we provide evidence that the length of the N-terminus may not allow distinguishing between the different B-class GATAs at the functional level. In turn, we find that the presence and absence of the LLM-domain in the overexpressors has differential effects on hypocotyl elongation, leaf shape, and petiole length as well as on gene expression. Thus, our analyses identify the LLM-domain as an evolutionarily conserved domain that determines B-class GATA factor identity and provides a further subclassification criterion for this transcription factor family.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Arabidopsis-thaliana; Hanaba-taranu; Flower Development; Factors Gnc; Gene; Specification; Downstream; Proteins; Gnl/cga1; Identity
ISSN (print) / ISBN 0032-0889
e-ISSN 1532-2548
Journal Plant Physiology
Quellenangaben Volume: 166, Issue: 1, Pages: 293-305 Article Number: , Supplement: ,
Publisher American Society of Plant Biologists (ASPB)
Publishing Place Rockville
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Research Unit Plant Genome and Systems Biology (PGSB)