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Poplar carbohydrate-active enzymes. Gene identification and expression analyses.

Identifieur interne : 003D45 ( Main/Exploration ); précédent : 003D44; suivant : 003D46

Poplar carbohydrate-active enzymes. Gene identification and expression analyses.

Auteurs : Jane Geisler-Lee [Suède] ; Matt Geisler ; Pedro M. Coutinho ; Bo Segerman ; Nobuyuki Nishikubo ; Junko Takahashi ; Henrik Aspeborg ; Soraya Djerbi ; Emma Master ; Sara Andersson-Gunner S ; Björn Sundberg ; Stanislaw Karpinski ; Tuula T. Teeri ; Leszek A. Kleczkowski ; Bernard Henrissat ; Ewa J. Mellerowicz

Source :

RBID : pubmed:16415215

Descripteurs français

English descriptors

Abstract

Over 1,600 genes encoding carbohydrate-active enzymes (CAZymes) in the Populus trichocarpa (Torr. & Gray) genome were identified based on sequence homology, annotated, and grouped into families of glycosyltransferases, glycoside hydrolases, carbohydrate esterases, polysaccharide lyases, and expansins. Poplar (Populus spp.) had approximately 1.6 times more CAZyme genes than Arabidopsis (Arabidopsis thaliana). Whereas most families were proportionally increased, xylan and pectin-related families were underrepresented and the GT1 family of secondary metabolite-glycosylating enzymes was overrepresented in poplar. CAZyme gene expression in poplar was analyzed using a collection of 100,000 expressed sequence tags from 17 different tissues and compared to microarray data for poplar and Arabidopsis. Expression of genes involved in pectin and hemicellulose metabolism was detected in all tissues, indicating a constant maintenance of transcripts encoding enzymes remodeling the cell wall matrix. The most abundant transcripts encoded sucrose synthases that were specifically expressed in wood-forming tissues along with cellulose synthase and homologs of KORRIGAN and ELP1. Woody tissues were the richest source of various other CAZyme transcripts, demonstrating the importance of this group of enzymes for xylogenesis. In contrast, there was little expression of genes related to starch metabolism during wood formation, consistent with the preferential flux of carbon to cell wall biosynthesis. Seasonally dormant meristems of poplar showed a high prevalence of transcripts related to starch metabolism and surprisingly retained transcripts of some cell wall synthesis enzymes. The data showed profound changes in CAZyme transcriptomes in different poplar tissues and pointed to some key differences in CAZyme genes and their regulation between herbaceous and woody plants.

DOI: 10.1104/pp.105.072652
PubMed: 16415215
PubMed Central: PMC1400564


Affiliations:


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Le document en format XML

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<term>Carbon (metabolism)</term>
<term>Cell Wall (metabolism)</term>
<term>Enzymes (classification)</term>
<term>Enzymes (genetics)</term>
<term>Enzymes (metabolism)</term>
<term>Expressed Sequence Tags (MeSH)</term>
<term>Gene Expression Profiling (MeSH)</term>
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<term>Genetic Variation (MeSH)</term>
<term>Genome, Plant (MeSH)</term>
<term>Models, Biological (MeSH)</term>
<term>Multigene Family (MeSH)</term>
<term>Oligonucleotide Array Sequence Analysis (MeSH)</term>
<term>Plant Proteins (classification)</term>
<term>Plant Proteins (genetics)</term>
<term>Plant Proteins (metabolism)</term>
<term>Populus (enzymology)</term>
<term>Populus (genetics)</term>
<term>RNA, Plant (metabolism)</term>
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<term>Starch (metabolism)</term>
<term>Sucrose (metabolism)</term>
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<term>ARN des plantes (métabolisme)</term>
<term>Amidon (métabolisme)</term>
<term>Analyse de profil d'expression de gènes (MeSH)</term>
<term>Arabidopsis (génétique)</term>
<term>Carbone (métabolisme)</term>
<term>Enzymes (classification)</term>
<term>Enzymes (génétique)</term>
<term>Enzymes (métabolisme)</term>
<term>Famille multigénique (MeSH)</term>
<term>Génome végétal (MeSH)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Métabolisme glucidique (MeSH)</term>
<term>Paroi cellulaire (métabolisme)</term>
<term>Populus (enzymologie)</term>
<term>Populus (génétique)</term>
<term>Protéines végétales (classification)</term>
<term>Protéines végétales (génétique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Saccharose (métabolisme)</term>
<term>Saisons (MeSH)</term>
<term>Séquençage par oligonucléotides en batterie (MeSH)</term>
<term>Variation génétique (MeSH)</term>
<term>Étiquettes de séquences exprimées (MeSH)</term>
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<term>Enzymes</term>
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<term>Enzymes</term>
<term>Plant Proteins</term>
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<term>Carbon</term>
<term>Enzymes</term>
<term>Plant Proteins</term>
<term>RNA, Plant</term>
<term>Starch</term>
<term>Sucrose</term>
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<keywords scheme="MESH" qualifier="classification" xml:lang="fr">
<term>Enzymes</term>
<term>Protéines végétales</term>
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<keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr">
<term>Populus</term>
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<keywords scheme="MESH" qualifier="enzymology" xml:lang="en">
<term>Populus</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Arabidopsis</term>
<term>Populus</term>
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<term>Arabidopsis</term>
<term>Enzymes</term>
<term>Populus</term>
<term>Protéines végétales</term>
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<term>Cell Wall</term>
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<term>ARN des plantes</term>
<term>Amidon</term>
<term>Carbone</term>
<term>Enzymes</term>
<term>Paroi cellulaire</term>
<term>Protéines végétales</term>
<term>Saccharose</term>
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<term>Expressed Sequence Tags</term>
<term>Gene Expression Profiling</term>
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<term>Genetic Variation</term>
<term>Genome, Plant</term>
<term>Models, Biological</term>
<term>Multigene Family</term>
<term>Oligonucleotide Array Sequence Analysis</term>
<term>Seasons</term>
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<term>Famille multigénique</term>
<term>Génome végétal</term>
<term>Modèles biologiques</term>
<term>Métabolisme glucidique</term>
<term>Régulation de l'expression des gènes végétaux</term>
<term>Saisons</term>
<term>Séquençage par oligonucléotides en batterie</term>
<term>Variation génétique</term>
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<div type="abstract" xml:lang="en">Over 1,600 genes encoding carbohydrate-active enzymes (CAZymes) in the Populus trichocarpa (Torr. & Gray) genome were identified based on sequence homology, annotated, and grouped into families of glycosyltransferases, glycoside hydrolases, carbohydrate esterases, polysaccharide lyases, and expansins. Poplar (Populus spp.) had approximately 1.6 times more CAZyme genes than Arabidopsis (Arabidopsis thaliana). Whereas most families were proportionally increased, xylan and pectin-related families were underrepresented and the GT1 family of secondary metabolite-glycosylating enzymes was overrepresented in poplar. CAZyme gene expression in poplar was analyzed using a collection of 100,000 expressed sequence tags from 17 different tissues and compared to microarray data for poplar and Arabidopsis. Expression of genes involved in pectin and hemicellulose metabolism was detected in all tissues, indicating a constant maintenance of transcripts encoding enzymes remodeling the cell wall matrix. The most abundant transcripts encoded sucrose synthases that were specifically expressed in wood-forming tissues along with cellulose synthase and homologs of KORRIGAN and ELP1. Woody tissues were the richest source of various other CAZyme transcripts, demonstrating the importance of this group of enzymes for xylogenesis. In contrast, there was little expression of genes related to starch metabolism during wood formation, consistent with the preferential flux of carbon to cell wall biosynthesis. Seasonally dormant meristems of poplar showed a high prevalence of transcripts related to starch metabolism and surprisingly retained transcripts of some cell wall synthesis enzymes. The data showed profound changes in CAZyme transcriptomes in different poplar tissues and pointed to some key differences in CAZyme genes and their regulation between herbaceous and woody plants.</div>
</front>
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<AbstractText>Over 1,600 genes encoding carbohydrate-active enzymes (CAZymes) in the Populus trichocarpa (Torr. & Gray) genome were identified based on sequence homology, annotated, and grouped into families of glycosyltransferases, glycoside hydrolases, carbohydrate esterases, polysaccharide lyases, and expansins. Poplar (Populus spp.) had approximately 1.6 times more CAZyme genes than Arabidopsis (Arabidopsis thaliana). Whereas most families were proportionally increased, xylan and pectin-related families were underrepresented and the GT1 family of secondary metabolite-glycosylating enzymes was overrepresented in poplar. CAZyme gene expression in poplar was analyzed using a collection of 100,000 expressed sequence tags from 17 different tissues and compared to microarray data for poplar and Arabidopsis. Expression of genes involved in pectin and hemicellulose metabolism was detected in all tissues, indicating a constant maintenance of transcripts encoding enzymes remodeling the cell wall matrix. The most abundant transcripts encoded sucrose synthases that were specifically expressed in wood-forming tissues along with cellulose synthase and homologs of KORRIGAN and ELP1. Woody tissues were the richest source of various other CAZyme transcripts, demonstrating the importance of this group of enzymes for xylogenesis. In contrast, there was little expression of genes related to starch metabolism during wood formation, consistent with the preferential flux of carbon to cell wall biosynthesis. Seasonally dormant meristems of poplar showed a high prevalence of transcripts related to starch metabolism and surprisingly retained transcripts of some cell wall synthesis enzymes. The data showed profound changes in CAZyme transcriptomes in different poplar tissues and pointed to some key differences in CAZyme genes and their regulation between herbaceous and woody plants.</AbstractText>
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<MeshHeading>
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