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  • Title: The Hypocrea jecorina (syn. Trichoderma reesei) lxr1 gene encodes a D-mannitol dehydrogenase and is not involved in L-arabinose catabolism.
    Author: Metz B, de Vries RP, Polak S, Seidl V, Seiboth B.
    Journal: FEBS Lett; 2009 Apr 17; 583(8):1309-13. PubMed ID: 19303876.
    Abstract:
    The Hypocrea jecorina LXR1 was described as the first fungal L-xylulose reductase responsible for NADPH dependent reduction of L-xylulose to xylitol in L-arabinose catabolism. Phylogenetic analysis now reveals that LXR1 forms a clade with fungal D-mannitol 2-dehydrogenases. Lxr1 and the orthologous Aspergillus niger mtdA are not induced by L-arabinose but expressed at low levels during growth on different carbon sources. Deletion of lxr1 does not affect growth on L-arabinose and L-xylulose reductase activity remains unaltered whereas D-mannitol 2-dehydrogenase activities are reduced. We conclude that LXR1 is a D-mannitol 2-dehydrogenase and that a true LXR1 is still awaiting discovery.
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