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Updated: Jun 25, 2026

Histological Quantification to Determine Lung Fungal Burden in Experimental Aspergillosis
Published on: March 9, 2018
Protostadienol biosynthesis and metabolism in the pathogenic fungus Aspergillus fumigatus
Silvia Lodeiro1, Quanbo Xiong, William K Wilson
1Department of Chemistry, Rice University, Houston, Texas 77005, USA.
Abstract:
Details of the fungal biosynthetic pathway to helvolic acid and other fusidane antibiotics remain obscure. During product characterization of oxidosqualene cyclases in Aspergillus fumigatus, we found the long-sought cyclase that makes (17Z)-protosta-17(20),24-dien-3beta-ol, the precursor of helvolic acid. We then identified a gene cluster encoding the pathway to helvolic acid, which is controlled by a transcription regulator (LaeA) associated with fungal virulence. Evidence regarding the evolutionary origin and taxonomic distribution of fusidane biosynthesis is also presented.
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