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Purification and characterization of peroxidases correlated with lignification in poplar xylem.

Identifieur interne : 004926 ( Main/Exploration ); précédent : 004925; suivant : 004927

Purification and characterization of peroxidases correlated with lignification in poplar xylem.

Auteurs : J H Christensen [Belgique] ; G. Bauw ; K G Welinder ; M. Van Montagu ; W. Boerjan

Source :

RBID : pubmed:9733532

Descripteurs français

English descriptors

Abstract

Lignin is an integral cell wall component of all vascular plants. Peroxidases are widely believed to catalyze the last enzymatic step in the biosynthesis of lignin, the dehydrogenation of the p-coumaryl alcohols. As the first stage in identifying lignin-specific peroxidase isoenzymes, the classical anionic peroxidases found in the xylem of poplar (Populus trichocarpa Trichobel) were purified and characterized. Five different poplar xylem peroxidases (PXP 1, PXP 2, PXP 3-4, PXP 5, and PXP 6) were isolated. All five peroxidases were strongly glycosylated (3.6% to 4.9% N-glucosamine), with apparent molecular masses between 46 and 54 kD and pI values between pH 3.1 and 3.8. Two of the five isolated peroxidases (PXP 3-4 and PXP 5) could oxidize the lignin monomer analog syringaldazine, an activity previously correlated with lignification in poplar. Because these isoenzymes were specifically or preferentially expressed in xylem, PXP 3-4 and PXP 5 are suggested to be involved in lignin polymerization.

DOI: 10.1104/pp.118.1.125
PubMed: 9733532
PubMed Central: PMC34849


Affiliations:


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Le document en format XML

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<term>Isoenzymes (metabolism)</term>
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<div type="abstract" xml:lang="en">Lignin is an integral cell wall component of all vascular plants. Peroxidases are widely believed to catalyze the last enzymatic step in the biosynthesis of lignin, the dehydrogenation of the p-coumaryl alcohols. As the first stage in identifying lignin-specific peroxidase isoenzymes, the classical anionic peroxidases found in the xylem of poplar (Populus trichocarpa Trichobel) were purified and characterized. Five different poplar xylem peroxidases (PXP 1, PXP 2, PXP 3-4, PXP 5, and PXP 6) were isolated. All five peroxidases were strongly glycosylated (3.6% to 4.9% N-glucosamine), with apparent molecular masses between 46 and 54 kD and pI values between pH 3.1 and 3.8. Two of the five isolated peroxidases (PXP 3-4 and PXP 5) could oxidize the lignin monomer analog syringaldazine, an activity previously correlated with lignification in poplar. Because these isoenzymes were specifically or preferentially expressed in xylem, PXP 3-4 and PXP 5 are suggested to be involved in lignin polymerization.</div>
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<name sortKey="Welinder, K G" sort="Welinder, K G" uniqKey="Welinder K" first="K G" last="Welinder">K G Welinder</name>
</noCountry>
<country name="Belgique">
<region name="Région flamande">
<name sortKey="Christensen, J H" sort="Christensen, J H" uniqKey="Christensen J" first="J H" last="Christensen">J H Christensen</name>
</region>
</country>
</tree>
</affiliations>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Bois/explor/PoplarV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 004926 | SxmlIndent | more

Ou

HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 004926 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Bois
   |area=    PoplarV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     pubmed:9733532
   |texte=   Purification and characterization of peroxidases correlated with lignification in poplar xylem.
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i   -Sk "pubmed:9733532" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd   \
       | NlmPubMed2Wicri -a PoplarV1 

Wicri

This area was generated with Dilib version V0.6.37.
Data generation: Wed Nov 18 12:07:19 2020. Site generation: Wed Nov 18 12:16:31 2020