ZmMADS47 Regulates Zein Gene Transcription through Interaction with Opaque2.

Abstract:

:Zeins, the predominent storage proteins in maize endosperm, are encoded by multiple genes and gene families. However, only a few transcriptional factors for zein gene regulation have been functionally characterized. In this study, a MADS-box protein, namely ZmMADS47, was identified as an Opaque2 (O2) interacting protein via yeast two-hybrid screening. The N-terminal portion of ZmMADS47 contains a nuclear localization signal (NLS), and its C-terminal portion contains a transcriptional activation domain (AD). Interestingly, the transcriptional activation activity is blocked in its full length form, suggesting conformational regulation of the AD. Molecular and RNA-seq analyses of ZmMADS47 RNAi lines revealed down regulation of α-zein and 50-kD γ-zein genes. ZmMADS47 binds the CATGT motif in promoters of these zein genes, but ZmMADS47 alone is not able to transactivate the promoters. However, when both O2 and ZmMADS47 are present, the transactivation of these promoters was greatly enhanced. This enhancement was dependent on the AD function of ZmMADS47 and the interaction between ZmMADS47 and O2, but it was independent from the AD function of O2. Therefore, it appears interaction with O2 activates ZmMADS47 on zein gene promoters.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Qiao Z,Qi W,Wang Q,Feng Y,Yang Q,Zhang N,Wang S,Tang Y,Song R

doi

10.1371/journal.pgen.1005991

subject

Has Abstract

pub_date

2016-04-14 00:00:00

pages

e1005991

issue

4

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-15-03156

journal_volume

12

pub_type

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