PoplarV1, Main, Exploration, bibRecord, 004584

Genetic manipulation of the metabolism of polyamines in poplar cells. The regulation of putrescine catabolism.

Identifieur interne : 004584 ( Main/Exploration ); précédent : 004583; suivant : 004585

Genetic manipulation of the metabolism of polyamines in poplar cells. The regulation of putrescine catabolism.

Auteurs : Pratiksha Bhatnagar [États-Unis] ; Rakesh Minocha ; Subhash C. Minocha

Source :

Plant physiology [ 0032-0889 ] ; 2002.

RBID : pubmed:11950994

Descripteurs français

English descriptors

KwdEn :
- 1-Pyrroline-5-Carboxylate Dehydrogenase (MeSH), Amine Oxidase (Copper-Containing) (metabolism), Animals (MeSH), Carbon Radioisotopes (MeSH), Cell Line (MeSH), Glutamate Decarboxylase (metabolism), Mice (MeSH), Ornithine (metabolism), Ornithine Decarboxylase (genetics), Ornithine Decarboxylase (metabolism), Oxidoreductases Acting on CH-NH Group Donors (metabolism), Plants, Genetically Modified (MeSH), Polyamines (metabolism), Putrescine (metabolism), Salicaceae (cytology), Salicaceae (genetics), Salicaceae (metabolism), Spermidine (metabolism).
MESH :
- chemical , genetics : Ornithine Decarboxylase.
- chemical , metabolism : Amine Oxidase (Copper-Containing), Glutamate Decarboxylase, Ornithine, Ornithine Decarboxylase, Oxidoreductases Acting on CH-NH Group Donors, Polyamines, Putrescine, Spermidine.
- chemical : 1-Pyrroline-5-Carboxylate Dehydrogenase, Carbon Radioisotopes.
- cytology : Salicaceae.
- genetics : Salicaceae.
- metabolism : Salicaceae.
- Animals, Cell Line, Mice, Plants, Genetically Modified.

Abstract

We investigated the catabolism of putrescine (Put) in a non-transgenic (NT) and a transgenic cell line of poplar (Populus nigra x maximowiczii) expressing a mouse (Mus musculus) ornithine (Orn) decarboxylase (odc) cDNA. The transgenic cells produce 3- to 4-fold higher amounts of Put than the NT cells. The rate of loss of Put from the cells and the initial half-life of cellular Put were determined by feeding the cells with [U-(14)C]Orn and [1,4-(14)C]Put as precursors and following the loss of [(14)C]Put in the cells at various times after transfer to label-free medium. The amount of Put converted into spermidine as well as the loss of Put per gram fresh weight were significantly higher in the transgenic cells than the NT cells. The initial half-life of exogenously supplied [(14)C]Put was not significantly different in the two cell lines. The activity of diamine oxidase, the major enzyme involved in Put catabolism, was comparable in the two cell lines even though the Put content of the transgenic cells was severalfold higher than the NT cells. It is concluded that in poplar cells: (a) exogenously supplied Orn enters the cells and is rapidly converted into Put, (b) the rate of Put catabolism is proportional to the rate of its biosynthesis, and (c) the increased Put degradation occurs without significant changes in the activity of diamine oxidase.

DOI: 10.1104/pp.010792
PubMed: 11950994
PubMed Central: PMC154273

Affiliations:

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Le document en format XML

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<term>Animals (MeSH)</term>
<term>Carbon Radioisotopes (MeSH)</term>
<term>Cell Line (MeSH)</term>
<term>Glutamate Decarboxylase (metabolism)</term>
<term>Mice (MeSH)</term>
<term>Ornithine (metabolism)</term>
<term>Ornithine Decarboxylase (genetics)</term>
<term>Ornithine Decarboxylase (metabolism)</term>
<term>Oxidoreductases Acting on CH-NH Group Donors (metabolism)</term>
<term>Plants, Genetically Modified (MeSH)</term>
<term>Polyamines (metabolism)</term>
<term>Putrescine (metabolism)</term>
<term>Salicaceae (cytology)</term>
<term>Salicaceae (genetics)</term>
<term>Salicaceae (metabolism)</term>
<term>Spermidine (metabolism)</term>
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<term>Amine oxidase (copper-containing) (métabolisme)</term>
<term>Animaux (MeSH)</term>
<term>Glutamate decarboxylase (métabolisme)</term>
<term>Lignée cellulaire (MeSH)</term>
<term>Ornithine (métabolisme)</term>
<term>Ornithine decarboxylase (génétique)</term>
<term>Ornithine decarboxylase (métabolisme)</term>
<term>Oxidoreductases acting on CH-NH group donors (métabolisme)</term>
<term>Polyamines (métabolisme)</term>
<term>Putrescine (métabolisme)</term>
<term>Radio-isotopes du carbone (MeSH)</term>
<term>Salicaceae (cytologie)</term>
<term>Salicaceae (génétique)</term>
<term>Salicaceae (métabolisme)</term>
<term>Souris (MeSH)</term>
<term>Spermidine (métabolisme)</term>
<term>Végétaux génétiquement modifiés (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Ornithine Decarboxylase</term>
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<term>Ornithine</term>
<term>Ornithine Decarboxylase</term>
<term>Oxidoreductases Acting on CH-NH Group Donors</term>
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<term>Putrescine</term>
<term>Spermidine</term>
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<keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Ornithine decarboxylase</term>
<term>Salicaceae</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Salicaceae</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Amine oxidase (copper-containing)</term>
<term>Glutamate decarboxylase</term>
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<term>Ornithine decarboxylase</term>
<term>Oxidoreductases acting on CH-NH group donors</term>
<term>Polyamines</term>
<term>Putrescine</term>
<term>Salicaceae</term>
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<term>Cell Line</term>
<term>Mice</term>
<term>Plants, Genetically Modified</term>
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<term>Lignée cellulaire</term>
<term>Radio-isotopes du carbone</term>
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<front><div type="abstract" xml:lang="en">We investigated the catabolism of putrescine (Put) in a non-transgenic (NT) and a transgenic cell line of poplar (Populus nigra x maximowiczii) expressing a mouse (Mus musculus) ornithine (Orn) decarboxylase (odc) cDNA. The transgenic cells produce 3- to 4-fold higher amounts of Put than the NT cells. The rate of loss of Put from the cells and the initial half-life of cellular Put were determined by feeding the cells with [U-(14)C]Orn and [1,4-(14)C]Put as precursors and following the loss of [(14)C]Put in the cells at various times after transfer to label-free medium. The amount of Put converted into spermidine as well as the loss of Put per gram fresh weight were significantly higher in the transgenic cells than the NT cells. The initial half-life of exogenously supplied [(14)C]Put was not significantly different in the two cell lines. The activity of diamine oxidase, the major enzyme involved in Put catabolism, was comparable in the two cell lines even though the Put content of the transgenic cells was severalfold higher than the NT cells. It is concluded that in poplar cells: (a) exogenously supplied Orn enters the cells and is rapidly converted into Put, (b) the rate of Put catabolism is proportional to the rate of its biosynthesis, and (c) the increased Put degradation occurs without significant changes in the activity of diamine oxidase.</div>
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<Abstract><AbstractText>We investigated the catabolism of putrescine (Put) in a non-transgenic (NT) and a transgenic cell line of poplar (Populus nigra x maximowiczii) expressing a mouse (Mus musculus) ornithine (Orn) decarboxylase (odc) cDNA. The transgenic cells produce 3- to 4-fold higher amounts of Put than the NT cells. The rate of loss of Put from the cells and the initial half-life of cellular Put were determined by feeding the cells with [U-(14)C]Orn and [1,4-(14)C]Put as precursors and following the loss of [(14)C]Put in the cells at various times after transfer to label-free medium. The amount of Put converted into spermidine as well as the loss of Put per gram fresh weight were significantly higher in the transgenic cells than the NT cells. The initial half-life of exogenously supplied [(14)C]Put was not significantly different in the two cell lines. The activity of diamine oxidase, the major enzyme involved in Put catabolism, was comparable in the two cell lines even though the Put content of the transgenic cells was severalfold higher than the NT cells. It is concluded that in poplar cells: (a) exogenously supplied Orn enters the cells and is rapidly converted into Put, (b) the rate of Put catabolism is proportional to the rate of its biosynthesis, and (c) the increased Put degradation occurs without significant changes in the activity of diamine oxidase.</AbstractText>
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<Reference><Citation>Biochem J. 1993 Apr 15;291 ( Pt 2):505-8</Citation>
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<Reference><Citation>Plant J. 1998 Mar;13(6):781-91</Citation>
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Genetic manipulation of the metabolism of polyamines in poplar cells. The regulation of putrescine catabolism.

Genetic manipulation of the metabolism of polyamines in poplar cells. The regulation of putrescine catabolism.

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