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Function: __construct
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L'acide ascorbique répandu (AsA) joue un rôle essentiel dans le développement des plantes et la tolérance au stress abiotique, mais la concentration en AsA varie considérablement entre les différentes plantes. La GDP-D-mannose-épimérase (GME), qui catalyse le GDP-D-mannose en GDP-L-galactose ou GDP-L-gulose, est une enzyme clé de la voie de biosynthèse de l’AsA de plante. Les fonctions et les schémas d'expression de la GME ont été bien étudiés dans des travaux antérieurs. Cependant, peu d'informations sont connues sur les schémas évolutifs du gène. Dans cette étude, la structure du gène GME, les motifs protéiques conservés correspondants et les relations évolutives ont été systématiquement analysés. Au total, 111 séquences de gènes GME ont été extraites de 59 génomes de plantes, représentant presque toutes les lignées principales de Viridiplantae: dicotylédones, monocotylédones, gymnospermes, ptéridophytes, bryophytes et chlorophytes. Les résultats ont montré que les homologues de GME étaient largement présents dans Viridiplantae. La structure du gène GME était conservatrice chez les plantes supérieures, tandis qu'elle variait considérablement dans les sous-groupes basaux de la phylogénie, y compris les lycophytes, les bryophytes et les chlorophytes, suggérant que la structure du gène GME aurait subi une différenciation sévère chez le plant inférieur, puis progressivement fixée au fur et à mesure de son évolution. Les motifs de base de la GME étaient fortement conservés dans Viridiplantae, suggérant la fonction conservée de la protéine. L'analyse de l'évolution moléculaire a montré qu'une sélection fortement purifiante était la force prédominante dans l'évolution de la GME. Quelques branches et sites faisant l’objet d’une sélection diversifiante épisodique ont été identifiés et la plupart des branches situées dans le sous-groupe des chlorphytes, indiquant que la sélection diversifiante épisodique dans quelques branches et sites pourrait jouer un rôle dans l’évolution de l’EMG et que la sélection stade précoce de Viridiplantae. Nos résultats fournissent de nouvelles informations sur la conservation fonctionnelle et l'évolution de la GME.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30233629