Andersen, Mikael Rørdam1; Nielsen, Jakob Blæsbjerg1; Klitgaard, Andreas6; Petersen, Lene Maj1; Zachariasen, Mia7; Hansen, Tilde J7; Holberg Blicher, Lene1; Gotfredsen, Charlotte Held4; Larsen, Thomas Ostenfeld1; Nielsen, Kristian Fog1; Mortensen, Uffe Hasbro1
1 Department of Systems Biology, Technical University of Denmark2 Center for Microbial Biotechnology, Department of Systems Biology, Technical University of Denmark3 Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark4 Department of Chemistry, Technical University of Denmark5 Organic Chemistry, Department of Chemistry, Technical University of Denmark6 Office for HR, Administration, Technical University of Denmark7 Technical University of Denmark
Biosynthetic pathways of secondary metabolites from fungi are currently subject to an intense effort to elucidate the genetic basis for these compounds due to their large potential within pharmaceutics and synthetic biochemistry. The preferred method is methodical gene deletions to identify supporting enzymes for key synthases one cluster at a time. In this study, we design and apply a DNA expression array for Aspergillus nidulans in combination with legacy data to form a comprehensive gene expression compendium. We apply a guilt-by-association-based analysis to predict the extent of the biosynthetic clusters for the 58 synthases active in our set of experimental conditions. A comparison with legacy data shows the method to be accurate in 13 of 16 known clusters and nearly accurate for the remaining 3 clusters. Furthermore, we apply a data clustering approach, which identifies cross-chemistry between physically separate gene clusters (superclusters), and validate this both with legacy data and experimentally by prediction and verification of a supercluster consisting of the synthase AN1242 and the prenyltransferase AN11080, as well as identification of the product compound nidulanin A. We have used A. nidulans for our method development and validation due to the wealth of available biochemical data, but the method can be applied to any fungus with a sequenced and assembled genome, thus supporting further secondary metabolite pathway elucidation in the fungal kingdom.
National Academy of Sciences. Proceedings, 2013, Vol 110, Issue 1