FIGURE 1.

l-arabinose/d-xylose catabolic pathways in A. niger. l-Arabinose and d-xylose go through several reductions and oxidations. The reductions are NADPH-linked and the oxidations NAD-linked. The metabolites are in Fischer-projection, except for the l-xylulose which is upside down. The last step is a phosphorylation resulting in d-xylulose 5-phosphate, which is a metabolite of the pentose phosphate pathway. The gene names are indicated. All the genes have been identified except for the lxrA and the larA, which is subject of the present communication.