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Arabidopsis E2Fc functions in cell division and is degraded by the ubiquitin-SCFAtSKP2 pathway in response to light (2002)

by del Pozo, J C, M B Boniotti, C Gutierrez
Venue:Plant Cell
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Differential stability of Arabidopsis D-type cyclins: CYCD3;1 is a highly unstable protein degraded by a proteasome-dependent mechanism

by Seâ Verine Planchais, Anne K. Saml, James A. H. Murray - Plant J , 2004
"... CYCD3;1 is a highly unstable protein degraded by a proteasome-dependent mechanism ..."
Abstract - Cited by 15 (2 self) - Add to MetaCart
CYCD3;1 is a highly unstable protein degraded by a proteasome-dependent mechanism
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...w, see Vierstra, 2003). Plant cell-cycle regulatory proteins, such as B-type cyclins (Criqui et al., 2000; Genschik et al., 1998; Weingartner et al., 2003), Cdc6(Castellano et al., 2001) and E2F (del =-=Pozo et al., 2002-=-) have been shown to be destroyed via the ubiquitin/ 26S proteasome pathway. Here, we used the proteasome inhibitor MG132 to show for the ®rst time that proteolysis of a D-type cyclin is mediated thro...

A novel motif in geminivirus replication proteins interacts with the plant retinoblastoma-related protein

by Gerardo Arguello-astorga, Luisa Lopez-ochoa, Gerardo Arguello-astorga, Luisa Lopez-ochoa, Ling-jie Kong, Beverly M. Orozco, Sharon B. Settlage, Linda Hanley-bowdoin - J Virol , 2004
"... This article cites 67 articles, 27 of which can be accessed free at: ..."
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This article cites 67 articles, 27 of which can be accessed free at:
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...R-binding proteins, like cyclin D (49), the mastrevirus RepA protein (25, 32, 43, 66), and the nanovirus Clink protein (3). However, there are plant proteins, including some E2F transcription factors =-=(11, 14)-=- and chromatin-remodeling proteins (2, 56, 57), that interact with pRBR through other sequences. TGMV AL1 does not have an LXCXE motif and falls into this second group of pRBR binding proteins. A prev...

Role of an atypical E2F transcription factor in the control of Arabidopsis cell growth and differentiation

by Elena Ramirez-parra, M. Angeles López-matas, Corinne Fründt, Crisanto Gutierrez, Centro Biologia, Molecular Severo Ochoa, Consejo Superior, Investigaciones Científicas - Plant Cell , 2004
"... The balance between cell proliferation and differentiation is crucial in multicellular organisms, where it is regulated by complex gene expression networks. This is particularly relevant in plants because organogenesis is a continuous postembryonic process. Here, we investigate the function of Arabi ..."
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The balance between cell proliferation and differentiation is crucial in multicellular organisms, where it is regulated by complex gene expression networks. This is particularly relevant in plants because organogenesis is a continuous postembryonic process. Here, we investigate the function of Arabidopsis thaliana E2Ff, an atypical member of the E2F family of transcription factors, which acts independently of a dimerization partner. We have focused our analysis on roots and hypocotyls, organs where (1) cell proliferation and differentiation are spatially and/or temporally separated, (2) growth depends on cell expansion in the longitudinal axis, and (3) the AtE2Ff promoter is active. AtE2Ff overexpression produced a reduction in the size of differentiated cells of these organs. Cells of mutant e2ff-1 plants with reduced levels of AtE2Ff mRNA were larger, especially in the hypocotyl, suggesting a role as a growth regulator. These effects of AtE2Ff are not associated with changes in nuclear ploidy levels or in the expression of cell cycle marker genes. However, expression of a subset of cell wall biogenesis genes is misregulated in an AtE2Ff-dependent manner, and based on chromatin immunoprecipitation experiments, they seem to be direct E2F targets. Our results highlight the complex regulatory function exerted by E2F and suggest a possible role of AtE2Ff in repressing cell wall biosynthesis genes during cell elongation in differentiated cells.
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...., 2002; Gutierrez et al., 2002). In addition, they regulate non-cell-cycle functions by mechanisms still poorly understood (Harbour and Dean, 2000a; Müller et al., 2001; Stevaux and Dyson, 2002; Del =-=Pozo et al., 2002-=-; Dimova et al., 2003; Ramirez-Parra et al., 2003; Vlieghe et al., 2003). Members of the retinoblastoma (RB) family that cooperate in the formation of repressor complexes modulate E2F/DP activity. RB-...

SCFSKP2B- AND KPC1-DEPENDENT DEGRADATION OF CYCLIN- DEPENDENT KINASE INHIBITOR KRP1 AND CELL CYCLE REGULATION IN ARABIDOPSIS THALIANA

by Hong Ren, Roger W. Innes, Roger P. Hangarter, David M. Kehoe , 2005
"... iii This dissertation is dedicated to Jingrong Wang, my wife, and Sifa Ren and Demei Zhao, my parents, for their love and support. iv Acknowledgements In the past seven and a half years of my graduate school life, it has been a wonderful and unforgettable journey. I was trained in two laboratories a ..."
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iii This dissertation is dedicated to Jingrong Wang, my wife, and Sifa Ren and Demei Zhao, my parents, for their love and support. iv Acknowledgements In the past seven and a half years of my graduate school life, it has been a wonderful and unforgettable journey. I was trained in two laboratories and at two universities. I studied for four years at the University of Texas (UT) at Austin and for three and a half years at IU-Bloomington. First of all, I would like to thank my advisor, Mark Estelle. I first met Mark in 2000 when I was a student in his Plant Developmental Genetics class at UT-Austin. From his class, I learned the power of genetics to studying plant development, which attracted me to switch to Mark’s lab to pursue my Ph.D. I feel truly lucky to have an advisor like Mark and to work in such a great laboratory. In the past five and a half years, under Mark’s guidance, I have
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...s in plant cell cycle regulation (Inzé, 2005; Thomann et al., 2005). The Arabidopsis genome encodes two closely related F-box proteins (called SKP2a and SKP2b) that are related to mammalian SKP2 (del =-=Pozo et al., 2002-=-a). SKP2a appears to recruit the phosphorylated form of the transcription factor E2Fc for degradation. Whether SKP2b also regulates E2Fc degradation is unknown. In addition to E2Fc, another cell cycle...

unknown title

by unknown authors
"... The development of multicellular organisms requires mechanisms that pattern cell proliferation and cell differentiation with temporal and spatial precision. The requirement of such patterning strategies is, for example, evident in plant root meristems, where stem cells ..."
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The development of multicellular organisms requires mechanisms that pattern cell proliferation and cell differentiation with temporal and spatial precision. The requirement of such patterning strategies is, for example, evident in plant root meristems, where stem cells
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... the AUX/IAA-ARF transcription factors directly control their expression in response to auxin. Previous studies have shown that auxin is also involved in regulating the stability of E2F proteins (del =-=Pozo et al., 2002-=-; Magyar et al., 2005), which suggests that part of the auxin-dependent cell cycle control might rely on their post-transcriptional modification. However, how direct this regulation is in relation to ...

unknown title

by unknown authors
"... Progression through the cell cycle is essential for the continued existence of all uni- and multicellular organisms. It is crucial for the survival of a cell that its DNA is correctly replicated. In mammals, the onset of DNA replication is regulated by the ..."
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Progression through the cell cycle is essential for the continued existence of all uni- and multicellular organisms. It is crucial for the survival of a cell that its DNA is correctly replicated. In mammals, the onset of DNA replication is regulated by the
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...nes might be shielded with other transcription factor complexes. A putative candidate is the E2Fc protein which, in analogy with the mammalian E2F6 protein, lacks a strong transactivation domain (del =-=Pozo et al., 2002-=-). Alternative candidates are the recently discovered DEL proteins, proven to bind as monomers to the canonical E2F-binding site (Kosugi and Ohashi, 2002b; Mariconti et al., 2002). Because of a lack o...

TheRoleoftheArabidopsis E2FB Transcription Factor in

by Regulating Auxin-dependent Cell Division W
"... several weeks. ..."
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several weeks.
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...sor because it has a shortened C-terminal transactivation domain, its overexpression results in decreased expression of the S-phase genes, and it inhibits cell division leading to enlarged cells (del =-=Pozo et al., 2002-=-). However, the subdivision of E2Fs into activators and repressors is not entirely clear. E2FC was shown to transactivate reporter genes with promoters containing E2F elements (Mariconti et al., 2002)...

unknown title

by Bénédicte Desvoyes, Crisanto Gutierrez , 2005
"... E2F targets and the two ORC1 genes are differently expressed in proliferating and endoreplicating cells ..."
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E2F targets and the two ORC1 genes are differently expressed in proliferating and endoreplicating cells
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...(19). Cell cycle arrest by sucrose starvation was carried out as described (19,20). Electrophoretic mobility shift assay (EMSA) EMSA was carried out as described (21), using purified AtE2Fc and AtDPb =-=(22)-=-. Oligonucleotides (only the sequence of the sense oligonucleotides is provided for simplicity) containing consensus E2F sites (underlined) were: ORC1a: 5 0 -GCAAACATTTCCCGCCAAATTTCT; ORC1b: 5 0 -GCCA...

unknown title

by Bénédicte Desvoyes, Crisanto Gutierrez , 2005
"... E2F targets and the two ORC1 genes are differently expressed in proliferating and endoreplicating cells ..."
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E2F targets and the two ORC1 genes are differently expressed in proliferating and endoreplicating cells
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...(19). Cell cycle arrest by sucrose starvation was carried out as described (19,20). Electrophoretic mobility shift assay (EMSA) EMSA was carried out as described (21), using purified AtE2Fc and AtDPb =-=(22)-=-. Oligonucleotides (only the sequence of the sense oligonucleotides is provided for simplicity) containing consensus E2F sites (underlined) were: ORC1a: 5 0 -GCAAACATTTCCCGCCAAATTTCT; ORC1b: 5 0 -GCCA...

Characterization of the VIER F-BOX PROTEINE Genes from Arabidopsis Reveals Their Importance for Plant Growth and Development W

by Katja M. Schwager, A Luz Irina A. Calderon-villalobos, Esther M. N. Dohmann, A Björn C. Willige, Stephan Knierer, Carola Nill, Claus Schwechheimer A
"... several weeks. ..."
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several weeks.
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...ncludes SKP2;1 and SKP2;2, the putative Arabidopsis orthologs of the mammalian SKP2 protein, which promotes the degradation of E2F transcription factors during the cell cycle (Marti et al., 1999; del =-=Pozo et al., 2002-=-a). Hence, hormone response regulatory F-box proteins may be derived from the evolutionarily conserved cell cycle regulatory SKP2s (Calderon-Villalobos et al., 2007). The vast majority of the 140 F-bo...

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