Dataset Information

Genetic and structural validation of Aspergillus fumigatus?UDP-N-acetylglucosamine pyrophosphorylase as an antifungal target.

ABSTRACT: The sugar nucleotide UDP-N-acetylglucosamine (UDP-GlcNAc) is an essential metabolite in both prokaryotes and eukaryotes. In fungi, it is the precursor for the synthesis of chitin, an essential component of the fungal cell wall. UDP-N-acetylglucosamine pyrophosphorylase (UAP) is the final enzyme in eukaryotic UDP-GlcNAc biosynthesis, converting UTP and N-acetylglucosamine-1-phosphate (GlcNAc-1P) to UDP-GlcNAc. As such, this enzyme may provide an attractive target against pathogenic fungi. Here, we demonstrate that the fungal pathogen Aspergillus fumigatus possesses an active UAP (AfUAP1) that shows selectivity for GlcNAc-1P as the phosphosugar substrate. A conditional mutant, constructed by replacing the native promoter of the A.?fumigatus?uap1 gene with the Aspergillus nidulans?alcA promoter, revealed that uap1 is essential for cell survival and important for cell wall synthesis and morphogenesis. The crystal structure of AfUAP1 was determined and revealed exploitable differences in the active site compared with the human enzyme. Thus AfUAP1 could represent a novel antifungal target and this work will assist the future discovery of small molecule inhibitors against this enzyme.

SUBMITTER: Fang W

PROVIDER: S-EPMC3888555 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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Genetic and structural validation of Aspergillus fumigatus UDP-N-acetylglucosamine pyrophosphorylase as an antifungal target.

Fang Wenxia W Du Ting T Raimi Olawale G OG Hurtado-Guerrero Ramon R Urbaniak Michael D MD Ibrahim Adel F M AF Ferguson Michael A J MA Jin Cheng C van Aalten Daan M F DM

Molecular microbiology 20130705 3

The sugar nucleotide UDP-N-acetylglucosamine (UDP-GlcNAc) is an essential metabolite in both prokaryotes and eukaryotes. In fungi, it is the precursor for the synthesis of chitin, an essential component of the fungal cell wall. UDP-N-acetylglucosamine pyrophosphorylase (UAP) is the final enzyme in eukaryotic UDP-GlcNAc biosynthesis, converting UTP and N-acetylglucosamine-1-phosphate (GlcNAc-1P) to UDP-GlcNAc. As such, this enzyme may provide an attractive target against pathogenic fungi. Here, w ...[more]

PMID: 23750903

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Project description:Ergosterol plays an important role in maintaining cell membrane sterol homeostasis in fungi, and as such, it is considered an effective target in antifungal chemotherapy. In yeast, the enzyme acetyl-coenzyme A (CoA) acetyltransferase (ERG10) catalyzes the Claisen condensation of two acetyl-CoA molecules to acetoacetyl-CoA in the ergosterol biosynthesis pathway and is reported as being critical for cell viability. Using yeast ERG10 for alignment, two orthologues, AfERG10A (AFUB_000550) and AfERG10B (AFUB_083570), were discovered in the opportunistic fungal pathogen Aspergillus fumigatus Despite the essentiality of AfERG10B having been previously validated, the biological function of AfERG10A remains unclear. In this study, we have characterized recombinant AfERG10A as a functional acetyl-CoA acetyltransferase catalyzing both synthetic and degradative reactions. Unexpectedly, AfERG10A localizes to the mitochondria in A. fumigatus, as shown by C-terminal green fluorescent protein (GFP) tag fusion. Both knockout and inducible promoter strategies demonstrate that Aferg10A is essential for the survival of A. fumigatus The reduced expression of Aferg10A leads to severe morphological defects and increased susceptibility to oxidative and cell wall stresses. Although the catalytic mechanism of acetyl-CoA acetyltransferase family is highly conserved, the crystal structure of AfERG10A and its complex with CoA are solved, revealing four substitutions within the CoA binding site that are different from human orthologues. Taken together, our combination of genetic and structural studies demonstrates that mitochondrial AfERG10A is essential for A. fumigatus cell viability and could be a potential drug target to feed the antifungal drug development pipeline.IMPORTANCE A growing number of people worldwide are suffering from invasive aspergillosis caused by the human opportunistic fungal pathogen A. fumigatus Current therapeutic options rely on a limited repertoire of antifungals. Ergosterol is an essential component of the fungal cell membrane as well as a target of current antifungals. Approximately 20 enzymes are involved in ergosterol biosynthesis, of which acetyl-CoA acetyltransferase (ACAT) is the first enzyme. Two ACATs in A. fumigatus are AfErg10A and AfErg10B. However, the biological function of AfErg10A is yet to be investigated. In this study, we showed that AfErg10A is localized in the mitochondria and is essential for A. fumigatus survival and morphological development. In combination with structural studies, we validated AfErg10A as a potential drug target that will facilitate the development of novel antifungals and improve the efficiency of existing drugs.

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Dataset Information

Genetic and structural validation of Aspergillus fumigatus?UDP-N-acetylglucosamine pyrophosphorylase as an antifungal target.

Publications

Genetic and structural validation of Aspergillus fumigatus UDP-N-acetylglucosamine pyrophosphorylase as an antifungal target.

Similar Datasets

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