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10 matches found in 9 documents. Search time: 0.531 seconds.
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Score: 2.00
Title: The evolutionarily conserved OsPRR quintet : rice pseudo-response regulators implicated in circadian rhythm .
Author: Murakami M Ashikari M Miura K Yamashino T Mizuno T
Journal: Plant Cell Physiol . Citation: V : 44 ( 11 ) P : 1229-36 Year: 2003 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub14634161 Accession (PMID): 14634161
Abstract: In Arabidopsis thaliana , a number of circadian-associated factors have been identified , including TOC1 ( TIMING OF CAB EXPRESSION 1 ) that is believed to be a component of the central oscillator . TOC1 is a member of a small family of proteins , designated as ARABIDOPSIS PSEUDO-RESPONSE REGULATORS ( APRR1/TOC1 , APRR3 , APRR5 , APRR7 , and APRR9 ) . As demonstrated previously , these APRR1/TOC1 quintet members are crucial for a better understanding of the molecular links between circadian rhythms , control of flowering time through photoperiodic pathways , and also photosensory signal transduction in this dicotyledonous plant . In this respect , both the dicotyledonous ( eg A thaliana ) and monocotyledonous ( eg Oryza sativa ) plants might share the evolutionarily conserved molecular mechanism underlying the circadian rhythm . Based on such an assumption , and as the main objective of this study , we asked the question of whether rice also has a set of pseudo-response regulators , and if so , whether or not they are associated with the circadian rhythm . Here we showed that rice has five members of the OsPRR family ( Oryza sativa Pseudo-Response Regulator ) , and also that the expressions of these OsPRR genes are under the control of circadian rhythm . They are expressed in a diurnal and sequential manner in the order of OsPRR73 ( OsPRR37 ) -->OsPRR95 ( OsPRR59 ) -->OsPRR1 , which is reminiscent of the circadian waves of the APRR1/TOC1 quintet in A thaliana . These and other results of this study suggested that the OsPRR quintet , including the ortholog of APRR1/TOC1 , might play important roles within , or close to , the circadian clock of rice .
Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: In Arabidopsis thaliana , a number of circadian-associated factors have been identified , including TOC1 ( TIMING OF CAB EXPRESSION 1 ) that is believed to be a component of the central oscillator .
[ Sen. 2, subscore: 1.00 ]: TOC1 is a member of a small family of proteins , designated as ARABIDOPSIS PSEUDO-RESPONSE REGULATORS ( APRR1/TOC1 , APRR3 , APRR5 , APRR7 , and APRR9 ) .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: The evolution of CONSTANS-like gene families in barley , rice , and Arabidopsis .
Author: Griffiths S Dunford RP Coupland G Laurie DA .
Journal: Plant Physiol . Citation: V : 131 ( 4 ) P : 1855-67 Year: 2003 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub12692345 Accession (PMID): 12692345
Abstract: The CO ( CONSTANS ) gene of Arabidopsis has an important role in the regulation of flowering by photoperiod . CO is part of a gene family with 17 members that are subdivided into three classes , termed Group I to III here . All members of the family have a CCT ( CO , CO-like , TOC1 ) domain near the carboxy terminus . Group I genes , which include CO , have two zinc finger B-boxes near the amino terminus . Group II genes have one B-box , and Group III genes have one B-box and a second diverged zinc finger . Analysis of rice ( Oryza sativa ) genomic sequence identified 16 genes ( OsA-OsP ) that were also divided into these three groups , showing that their evolution predates monocot/dicot divergence . Eight Group I genes ( HvCO1-HvCO8 ) were isolated from barley ( Hordeum vulgare ) , of which two ( HvCO1 and HvCO2 ) were highly CO like . HvCO3 and its rice counterpart ( OsB ) had one B-box that was distantly related to Group II genes and was probably derived by internal deletion of a two B-box Group I gene . Sequence homology and comparative mapping showed that HvCO1 was the counterpart of OsA ( Hd1 ) , a major determinant of photoperiod sensitivity in rice . Major genes determining photoperiod response have been mapped in barley and wheat ( Triticum aestivum ) , but none corresponded to CO-like genes . Thus , selection for variation in photoperiod response has affected different genes in rice and temperate cereals . The peptides of HvCO1 , HvCO2 ( barley ) , and Hd1 ( rice ) show significant structural differences from CO , particularly amino acid changes that are predicted to abolish B-box2 function , suggesting an evolutionary trend toward a one-B-box structure in the most CO-like cereal genes .
Matching Sentences:
[ Sen. 3, subscore: 1.00 ]: All members of the family have a CCT ( CO , CO-like , TOC1 ) domain near the carboxy terminus .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: The GATA family of transcription factors in Arabidopsis and rice .
Author: Reyes JC Muro-Pastor MI Florencio FJ .
Journal: Plant Physiol . Citation: V : 134 ( 4 ) P : 1718-32 Year: 2004 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15084732 Accession (PMID): 15084732
Abstract: GATA transcription factors are a group of DNA binding proteins broadly distributed in eukaryotes . The GATA factors DNA binding domain is a class IV zinc finger motif in the form CX ( 2 ) CX ( 17-20 ) CX ( 2 ) C followed by a basic region . In plants , GATA DNA motifs have been implicated in light-dependent and nitrate-dependent control of transcription . Herein , we show that the Arabidopsis and the rice ( Oryza sativa ) genomes present 29 and 28 loci , respectively , that encode for putative GATA factors . A phylogenetic analysis of the 57 GATA factors encoding genes , as well as the study of their intron-exon structure , indicates the existence of seven subfamilies of GATA genes . Some of these subfamilies are represented in both species but others are exclusive for one of them . In addition to the GATA zinc finger motif , polypeptides of the different subfamilies are characterized by the presence of additional domains such as an acidic domain , a CCT ( CONSTANS , CO-like , and TOC1 ) domain , or a transposase-like domain also found in FAR1 and FHY3 . Subfamily VI comprises genes that encode putative bi-zinc finger polypeptides , also found in metazoan and fungi , and a tri-zinc finger protein which has not been previously reported in eukaryotes . The phylogeny of the GATA zinc finger motif , excluding flanking regions , evidenced the existence of four classes of GATA zinc fingers , three of them containing 18 residues in the zinc finger loop and one containing a 20-residue loop . Our results support multiple models of evolution of the GATA gene family in plants including gene duplication and exon shuffling .
Matching Sentences:
[ Sen. 7, subscore: 1.00 ]: In addition to the GATA zinc finger motif , polypeptides of the different subfamilies are characterized by the presence of additional domains such as an acidic domain , a CCT ( CONSTANS , CO-like , and TOC1 ) domain , or a transposase-like domain also found in FAR1 and FHY3 .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Comparative Overviews of Clock-Associated Genes of Arabidopsis thaliana and Oryza sativa .
Author: Murakami M Tago Y Yamashino T Mizuno T
Journal: Plant Cell Physiol . Citation: V : 48 ( 1 ) P : 110-21 Year: 2007 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub17132630 Accession (PMID): 17132630
Abstract: In higher plants , circadian rhythms are highly relevant to a wide range of biological processes . To such circadian rhythms , the clock ( oscillator ) is central , and recent intensive studies on the model higher plant Arabidopsis thaliana have begun to shed light on the molecular mechanisms underlying the functions of the central clock . Such representative clock-associated genes of A thaliana are the homologous CCA1 and LHY genes , and five PRR genes that belong to a small family of pseudo-response regulators including TOC1 . Others are GI , ZTL , ELF3 , ELF4 , LUX/PCL1 , etc In this context , a simple question arose as to whether or not the molecular picture of the model Arabidopsis clock is conserved in other higher plants . Here we made an effort to answer the question with special reference to Oryza sativa , providing experimental evidence that this model monocot also has a set of highly conserved clock-associated genes , such as those designated as OsCCA1 , OsPRR-series including OsTOC1/OsPRR1 , OsZTLs , OsPCL1 as well as OsGI . These results will provide us with insight into the general roles of plant circadian clocks , such as those for the photoperiodic control of flowering time that has a strong impact on the reproduction and yield in many higher plants .
Matching Sentences:
[ Sen. 3, subscore: 1.00 ]: Such representative clock-associated genes of A thaliana are the homologous CCA1 and LHY genes , and five PRR genes that belong to a small family of pseudo-response regulators including TOC1 .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Characterization of the Rice Circadian Clock-Associated Pseudo-Response Regulators in Arabidopsis thaliana .
Author: Murakami M Tago Y Yamashino T Mizuno T
Journal: Citation: V : ( ) P : Year: 2007 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub17420570 Accession (PMID): 17420570
Abstract: Members of the small family of Arabidopsis PSEUDO-RESPONSE REGULATORS ( PRR1/TOC1 , PRR3 , PRR5 , PRR7 , and PRR9 ) play roles close to the circadian clock in Arabidopsis thaliana . We have reported that the rice ( Oryza sativa ) genome also encodes a set of PRR counterparts ( designated OsPRR1 , OsPRR37 , OsPRR59 , OsPRR73 , and OsPRR95 respectively ) . To gain new insight into the molecular functions of OsPRRs , we carried out genetic complementation analyses by introducing two representative rice genes , OsPRR1 and OsPRR37 , into the corresponding Arabidopsis loss-of-function mutants ( toc1 and prr7 respectively ) . The results showed that these OsPRR and AtPRR genes are genetically interchangeable at least in part , suggesting the conserved clock-associated function of these OsPRRs .
Matching Sentences:
[ Sen. 3, subscore: 1.00 ]: To gain new insight into the molecular functions of OsPRRs , we carried out genetic complementation analyses by introducing two representative rice genes , OsPRR1 and OsPRR37 , into the corresponding Arabidopsis loss-of-function mutants ( toc1 and prr7 respectively ) .
Supplemental links/files: reference in endnote online text related articles pubmed citation
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