The Loss-of-Function Mutation Leads to Enhanced α-L-Rhamnosidase Production by .

In L-rhamnose is catabolised to pyruvate and L-lactaldehyde, and the latter ultimately to L-lactate, via the non-phosphorylated pathway (LRA) encoded by the genes -, and that encodes a broad substrate range aldehyde dehydrogenase (ALDH) that also functions in ethanol utilisation. LRA pathway expression requires both the pathway-specific transcriptional activator RhaR ( is expressed constitutively) and the presence of L-rhamnose. The deletion of severely impairs growth when L-rhamnose is the sole source of carbon and in addition it abolishes the induction of genes that respond to L-rhamnose/RhaR, indicating that an intermediate of the LRA pathway is the physiological inducer likely required to activate RhaR.

-Mediated Transformation of NHEJ Mutant Conidia: An Efficient Tool for Targeted Gene Recombination Using Selectable Nutritional Markers.

Protoplast transformation for the introduction of recombinant DNA into is technically demanding and dependant on the availability and batch variability of commercial enzyme preparations. Given the success of -mediated transformation (ATMT) in diverse pathogenic fungi, we have adapted this method to facilitate transformation of . Using suitably engineered binary vectors, gene-targeted ATMT of non-homologous end-joining (NHEJ) mutant conidia has been carried out for the first time by complementation of a nutritional requirement (uridine/uracil auxotrophy).

Identification of the genes encoding the catalytic steps corresponding to LRA4 (l-2-keto-3-deoxyrhamnonate aldolase) and l-lactaldehyde dehydrogenase in Aspergillus nidulans: evidence for involvement of the loci AN9425/lraD and AN0544/aldA in the l-rhamnose catabolic pathway.

l-rhamnose is found in nature mainly as a component of structural plant polysaccharides and can be used as a carbon source by certain microorganisms. Catabolism of this sugar in bacteria, archaea and fungi occurs by two routes involving either phosphorylated or non-phosphorylated intermediates. Unlike the corresponding pathway in yeasts, the metabolic details of the non-phosphorylated pathway in filamentous fungi are not fully defined.

Advancing Veterinary Medical Education Worldwide: Where Do We Go From Here?

Veterinary medicine is a global public good. A robust system of both public and private veterinary services is essential to protect animal health. Improved animal health leads to global food security and reduces poverty by increasing productivity, controlling transboundary diseases and expanding access to international markets.