NDLI: SPIN1, a K Homology Domain Protein Negatively Regulated and Ubiquitinated by the E3 Ubiquitin Ligase SPL11, Is Involved in Flowering Time Control in Rice[W]

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SPIN1, a K Homology Domain Protein Negatively Regulated and Ubiquitinated by the E3 Ubiquitin Ligase SPL11, Is Involved in Flowering Time Control in Rice[W]

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SPIN1, a K Homology Domain Protein Negatively Regulated and Ubiquitinated by the E3 Ubiquitin Ligase SPL11, Is Involved in Flowering Time Control in Rice[W]

Content Provider	PubMed Central
Author	Vega-sánchez, Miguel E. Zeng, Lirong Chen, Songbiao Leung, Hei Wang, Guo-liang
Abstract	The rice (Oryza sativa) E3 ligase SPOTTED LEAF11 (SPL11) negatively regulates programmed cell death and disease resistance. We demonstrate here that SPL11 also regulates flowering via interaction with SPIN1 (for SPL11-interacting protein1), a Signal Transduction and Activation of RNA family member. SPIN1 binds RNA and DNA in vitro and interacts with SPL11 in the nucleus. Spl11 mutants have delayed flowering under long-day conditions. Spin1 overexpression causes late flowering independently of daylength; expression analyses of flowering marker genes in these lines suggested that SPIN1 represses flowering by downregulating the flowering promoter gene Heading date3a (Hd3a) via Hd1-dependent mechanisms in short days and by targeting Hd1-independent factors in long days. Both Spin1 and Spl11 are regulated diurnally in opposing phases. SPL11 negatively regulates Spin1 transcript levels, while SPIN1 also affects Spl11 expression. Moreover, we show that coincidence of high accumulation of Spin1 mRNA with the light in the morning and early evening is needed to repress flowering. SPIN1 is monoubiquitinated by SPL11, suggesting that it is not targeted for degradation. Our data are consistent with a model in which SPIN1 acts as a negative regulator of flowering that itself is negatively regulated by SPL11, possibly via ubiquitination.
Related Links	http://dx.doi.org/10.1105/tpc.108.058610
Ending Page	1469
Page Count	14
Starting Page	1456
File Format	PDF
ISSN	10404651
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	6
Volume Number	20
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2008-06-01
Access Restriction	Open
Rights Holder	American Society of Plant Biologists
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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