Whole-Genome Sequence Analysis of an Endophytic Fungus <i>Alternaria</i> sp. SPS-2 and Its Biosynthetic Potential of Bioactive Secondary Metabolites
2022
Jianyun Tao | Xuelian Bai | Mingyuan Zeng | Mengshi Li | Zhe Hu | Yunfen Hua | Huawei Zhang
As one of the commonly isolated endophytic fungi, <i>Alternaria</i> has been known for the production of numerous secondary metabolites (SMs). However, its detailed genomic features and SM biosynthetic potential have not been extensively studied thus far. The present work focuses on the whole-genome sequencing and assembly of an endophytic strain <i>Alternaria</i> sp. SPS-2 derived from <i>Echrysantha chrysantha</i> Lindl. and gene annotation using various bioinformatic tools. The results of this study suggested that the genome of strain SPS-2 was 33.4 Mb in size with a GC content of 51% and an N50 scaffold of 2.6 Mb, and 9789 protein-coding genes, including 644 CAZyme-encoding genes, were discovered in strain SPS-2 through KEGG enrichment analysis. The antiSMASH results indicated that strain SPS-2 harbored 22 SM biosynthetic gene clusters (BGCs), 14 of which are cryptic and unknown. LS–MS/MS and GNPS-based analyses suggested that this endophytic fungus is a potential producer of bioactive SMs and merits further exploration and development.
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