Metabolic Engineering of Fungal Strains for Conversion of D-galacturonate to Meso-galactarate

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 2009 Nov 10

PMID 19897761

Citations 26

Authors

Dominik Mojzita

Marilyn Wiebe

Satu Hilditch

Harry Boer

Merja Penttila

Peter Richard

Affiliations

Soon will be listed here.

Abstract

D-galacturonic acid can be obtained by hydrolyzing pectin, which is an abundant and low value raw material. By means of metabolic engineering, we constructed fungal strains for the conversion of D-galacturonate to meso-galactarate (mucate). Galactarate has applications in food, cosmetics, and pharmaceuticals and as a platform chemical. In fungi D-galacturonate is catabolized through a reductive pathway with a D-galacturonate reductase as the first enzyme. Deleting the corresponding gene in the fungi Hypocrea jecorina and Aspergillus niger resulted in strains unable to grow on D-galacturonate. The genes of the pathway for D-galacturonate catabolism were upregulated in the presence of D-galacturonate in A. niger, even when the gene for D-galacturonate reductase was deleted, indicating that D-galacturonate itself is an inducer for the pathway. A bacterial gene coding for a D-galacturonate dehydrogenase catalyzing the NAD-dependent oxidation of D-galacturonate to galactarate was introduced to both strains with disrupted D-galacturonate catabolism. Both strains converted D-galacturonate to galactarate. The resulting H. jecorina strain produced galactarate at high yield. The A. niger strain regained the ability to grow on d-galacturonate when the D-galacturonate dehydrogenase was introduced, suggesting that it has a pathway for galactarate catabolism.

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