| 14 matches found in 4 documents. Search time: 0.08 seconds. |
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Score: 7.00 |
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| Title: Intron loss and gain during evolution of the catalase gene family in angiosperms .
| | Author: Frugoli JA McPeek MA Thomas TL McClung CR .
| | Journal: Genetics Citation: V : 149 ( 1 ) P : 355-65 Year: 1998 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub9584109 Accession (PMID): 9584109 | | Abstract: Angiosperms ( flowering plants ) , including both monocots and dicots , contain small catalase gene families .
In the dicot , Arabidopsis thaliana , two catalase ( CAT ) genes , CAT1 and CAT3 , are tightly linked on chromosome 1 and a third , CAT2 , which is more similar to CAT1 than to CAT3 , is unlinked on chromosome 4 .
Comparison of positions and numbers of introns among 13 angiosperm catalase genomic sequences indicates that intron positions are conserved , and suggests that an ancestral catalase gene common to monocots and dicots contained seven introns .
Arabidopsis CAT2 has seven introns ; both CAT1 and CAT3 have six introns in positions conserved with CAT2 , but each has lost a different intron .
We suggest the following sequence of events during the evolution of the Arabidopsis catalase gene family .
An initial duplication of an ancestral catalase gene gave rise to CAT3 and CAT1 .
CAT1 then served as the template for a second duplication , yielding CAT2 .
Intron losses from CAT1 and CAT3 followed these duplications .
One subclade of monocot catalases has lost all but the 5-most and 3-most introns , which is consistent with a mechanism of intron loss by replacement of an ancestral intron-containing gene with a reverse-transcribed DNA copy of a fully spliced mRNA .
Following this event of concerted intron loss , the Oryza sativa ( rice , a monocot ) CAT1 lineage acquired an intron in a novel position , consistent with a mechanism of intron gain at proto-splice sites . | Matching Sentences:
[ Sen. 2, subscore: 2.00 ]: In the dicot , Arabidopsis thaliana , two catalase ( CAT ) genes , CAT1 and CAT3 , are tightly linked on chromosome 1 and a third , CAT2 , which is more similar to CAT1 than to CAT3 , is unlinked on chromosome 4 .
[ Sen. 4, subscore: 1.00 ]: Arabidopsis CAT2 has seven introns ; both CAT1 and CAT3 have six introns in positions conserved with CAT2 , but each has lost a different intron .
[ Sen. 6, subscore: 1.00 ]: An initial duplication of an ancestral catalase gene gave rise to CAT3 and CAT1 .
[ Sen. 7, subscore: 1.00 ]: CAT1 then served as the template for a second duplication , yielding CAT2 .
[ Sen. 8, subscore: 1.00 ]: Intron losses from CAT1 and CAT3 followed these duplications .
[ Sen. 10, subscore: 1.00 ]: Following this event of concerted intron loss , the Oryza sativa ( rice , a monocot ) CAT1 lineage acquired an intron in a novel position , consistent with a mechanism of intron gain at proto-splice sites .
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Score: 4.00 |
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| Title: Molecular cloning , characterization and expression analysis of two catalase isozyme genes in barley .
| | Author: Skadsen RW Schulze-Lefert P Herbst JM .
| | Journal: Plant Mol . Biol . Citation: V : 29 ( 5 ) P : 1005-14 Year: 1995 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub8555444 Accession (PMID): 8555444 | | Abstract: Clones representing two distinct barley catalase genes , Cat1 and Cat2 , were found in a cDNA library prepared from seedling polysomal mRNA .
Both clones were sequenced , and their deduced amino acid sequences were found to have high homology with maize and rice catalase genes .
Cat1 had a 91% deduced amino acid sequence identity to CAT-1 of maize and 92% to CAT B of rice .
Cat2 had 72 and 79% amino acid sequence identities to maize CAT-2 and -3 and 89% to CAT A of rice .
Barley , maize or rice isozymes could be divided into two distinct groups by amino acid homologies , with one group homologous to the mitochondria-associated CAT-3 of maize and the other homologous to the maize peroxisomal/glyoxysomal CAT-1 .
Both barley CATs contained possible peroxisomal targeting signals , but neither had favorable mitochondrial targeting sequences .
Cat1 mRNA occurred in whole endosperms ( aleurones plus starchy endosperm ) , in isolated aleurones and in developing seeds , but Cat2 mRNA was virtually absent .
Both mRNAs displayed different developmental expression patterns in scutella of germinating seeds .
Cat2 mRNA predominated in etiolated seedling shoots and leaf blades .
Barley genomic DNA contained two genes for Cat1 and one gene for Cat2 .
The Cat2 gene was mapped to the long arm of chromosome 4 , 2 . 9 cM in telomeric orientation from the mlo locus conferring resistance to the powdery mildew fungus ( Erysiphe graminis f . sp . hordei ) .
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[ Sen. 1, subscore: 1.00 ]: Clones representing two distinct barley catalase genes , Cat1 and Cat2 , were found in a cDNA library prepared from seedling polysomal mRNA .
[ Sen. 3, subscore: 1.00 ]: Cat1 had a 91% deduced amino acid sequence identity to CAT-1 of maize and 92% to CAT B of rice .
[ Sen. 7, subscore: 1.00 ]: Cat1 mRNA occurred in whole endosperms ( aleurones plus starchy endosperm ) , in isolated aleurones and in developing seeds , but Cat2 mRNA was virtually absent .
[ Sen. 10, subscore: 1.00 ]: Barley genomic DNA contained two genes for Cat1 and one gene for Cat2 .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 3.00 |
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| Title: Different responses of plant growth and antioxidant system to the combination of cadmium and heat stress in transgenic and non-transgenic rice .
| | Author: Zhao FY Liu W Zhang SY | | Journal: J Integr Plant Biol Citation: V : 51 P : 942-50 Year: 2009 Type: MEDLINE | | Literature: oryza Field: abstract Doc ID: pub19778404 Accession (PMID): 19778404 | | Abstract: A comparative study of just cadmium ( Cd ) or heat and their combination treatments on some physiological parameters and the antioxidant systems in transgenic rice ( Oryza sativa L cv .
Zhonghua No11 ) carrying glutathione-S-transferase ( GST , EC .
2 . 5 . 1 . 18 ) and catalase1 ( CAT1 , EC .
1 . 11 . 1 . 6 ) and non-transgenics was conducted .
The results revealed improved resistance in the transgenics to Cd and the combined Cd and heat stress than non-transgenics .
Data showed that the activities of CAT , GST , superoxide dismutase ( EC . 1 . 15 . 1 . 1 ) and all components of the ascorbate-glutathione cycle measured in the stressed transgenics shoots are significantly different from those of non-transgenics .
Results indicated that co-expression of GST and CAT1 had an important effect on the antioxidant system , in particular , the whole ascorbate-glutathione cycle .
The less oxidative damage induced by Cd and the stress combination in the transgenics resulted not only from the GST and CAT1 transgene but also from the coordination of the whole ascorbate-glutathione cycle .
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[ Sen. 3, subscore: 1.00 ]: 2 . 5 . 1 . 18 ) and catalase1 ( CAT1 , EC .
[ Sen. 7, subscore: 1.00 ]: Results indicated that co-expression of GST and CAT1 had an important effect on the antioxidant system , in particular , the whole ascorbate-glutathione cycle .
[ Sen. 8, subscore: 1.00 ]: The less oxidative damage induced by Cd and the stress combination in the transgenics resulted not only from the GST and CAT1 transgene but also from the coordination of the whole ascorbate-glutathione cycle .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
Score: 2.00 |
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| Title: Molecular evolution of maize catalases and their relationship to other eukaryotic and prokaryotic catalases .
| | Author: Guan L Scandalios JG .
| | Journal: J Mol .
Evol Citation: V : 42 ( 5 ) P : 570-9 Year: 1996 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub8662009 Accession (PMID): 8662009 | | Abstract: We have compared the nucleotide and protein sequences of the three maize catalase genes with other plant catalases to reconstruct the evolutionary relationship among these catalases .
These sequences were also compared with other eukaryotic and prokaryotic catalases .
Phylogenies based on distances and parsimony analysis show that all plant catalases derive from a common ancestral catalase gene and can be divided into three distinct groups .
The first , and major , group includes maize Cat1 , barley Cat1 , rice CatB , and most of the dicot catalases .
The second group is an apparent dicot-specific catalase group encompassing the tobacco Cat2 and tomato Cat .
The third is a monocot-specific catalase class including the maize Cat3 , barley Cat2 , and rice CatA .
The maize Cat2 gene is loosely related to the first group .
The distinctive features of monocot-specific catalases are their extreme high codon bias at the third position and low degree of sequence similarity to other plant catalases .
Similarities in the intron positions for several plant catalase genes support the conclusion of derivation from a common ancestral gene .
The similar intron position between bean catalases and human catalase implies that the animal and plant catalases might have derived from a common progenitor gene sequence .
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[ Sen. 4, subscore: 2.00 ]: The first , and major , group includes maize Cat1 , barley Cat1 , rice CatB , and most of the dicot catalases .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
