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The NAC domain mediates functional specificity of CUP‐SHAPED COTYLEDON proteins

The NAC domain mediates functional specificity of CUP‐SHAPED COTYLEDON proteins In higher plants, although several genes involved in shoot apical meristem (SAM) formation and organ separation have been isolated, the molecular mechanisms by which they function are largely unknown. CUP‐SHAPED COTYLEDON (CUC) 1 and CUC2 are examples of two such genes that encode the NAC domain proteins. This study investigated the molecular basis for their activities. Nuclear localization assays indicated that green fluorescent protein (GFP)‐CUC proteins accumulate in the nucleus. Yeast one‐hybrid and transient expression assays demonstrated that the C‐terminal domain (CTD) of the CUC has transactivation activity. Domain‐swapping experiments revealed that the functional specificity of the CUC for promoting adventitious shoot formation resides in the highly conserved NAC domain, not in the CTD in which motifs specific to the CUC subfamily are located. Taken together, these observations suggest that CUC proteins transactivate the target genes involved in SAM formation and organ separation through a specific interaction between the NAC domain and the promoter region of the target genes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

The NAC domain mediates functional specificity of CUP‐SHAPED COTYLEDON proteins

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References (29)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1111/j.1365-313X.2004.02238.x
pmid
15500463
Publisher site
See Article on Publisher Site

Abstract

In higher plants, although several genes involved in shoot apical meristem (SAM) formation and organ separation have been isolated, the molecular mechanisms by which they function are largely unknown. CUP‐SHAPED COTYLEDON (CUC) 1 and CUC2 are examples of two such genes that encode the NAC domain proteins. This study investigated the molecular basis for their activities. Nuclear localization assays indicated that green fluorescent protein (GFP)‐CUC proteins accumulate in the nucleus. Yeast one‐hybrid and transient expression assays demonstrated that the C‐terminal domain (CTD) of the CUC has transactivation activity. Domain‐swapping experiments revealed that the functional specificity of the CUC for promoting adventitious shoot formation resides in the highly conserved NAC domain, not in the CTD in which motifs specific to the CUC subfamily are located. Taken together, these observations suggest that CUC proteins transactivate the target genes involved in SAM formation and organ separation through a specific interaction between the NAC domain and the promoter region of the target genes.

Journal

The Plant JournalWiley

Published: Nov 1, 2004

Keywords: ; ; ; ; ;

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