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Zhou S, Li X, Lüli Y, Li X, Chen ZH, Yuan P, Yang ZL, Li G, Luo H. Novel Cyclic Peptides from Lethal Amanita Mushrooms through a Genome-Guided Approach. J Fungi (Basel) 2021; 7:204. [PMID: 33799506 PMCID: PMC7998459 DOI: 10.3390/jof7030204] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/05/2021] [Accepted: 03/08/2021] [Indexed: 11/17/2022] Open
Abstract
Most species in the genus Amanita are ectomycorrhizal fungi comprising both edible and poisonous mushrooms. Some species produce potent cyclic peptide toxins, such as α-amanitin, which places them among the deadliest organisms known to mankind. These toxins and related cyclic peptides are encoded by genes of the "MSDIN" family (named after the first five amino acid residues of the precursor peptides), and it is largely unknown to what extent these genes are expressed in the basidiocarps. In the present study, Amanita rimosa and Amanita exitialis were sequenced through the PacBio and Illumina techniques. Together with our two previously sequenced genomes, Amanita subjunquillea and Amanita pallidorosea, in total, 46 previously unknown MSDIN genes were discovered. The expression of over 80% of the MSDIN genes was demonstrated in A. subjunquillea. Through a combination of genomics and mass spectrometry, 12 MSDIN genes were shown to produce novel cyclic peptides. To further confirm the results, three of the cyclic peptides were chemically synthesized. The tandem mass spectrometry (MS/MS) spectra of the natural and the synthetic peptides shared a majority of the fragment ions, demonstrating an identical structure between each peptide pair. Collectively, the results suggested that the genome-guided approach is reliable for identifying novel cyclic peptides in Amanita species and that there is a large peptide reservoir in these mushrooms.
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Affiliation(s)
- Shengwen Zhou
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
- School of Life Sciences, Yunnan University, Kunming 650091, Yunnan, China;
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xincan Li
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunjiao Lüli
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xuan Li
- Department of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650091, Yunnan, China;
| | - Zuo H. Chen
- College of Life Science, Hunan Normal University, Changsha 410081, Hunan, China;
| | - Pengcheng Yuan
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
- School of Life Sciences, Yunnan University, Kunming 650091, Yunnan, China;
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhu L. Yang
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
| | - Guohong Li
- School of Life Sciences, Yunnan University, Kunming 650091, Yunnan, China;
| | - Hong Luo
- Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China; (S.Z.); (X.L.); (Y.L.); (P.Y.); (Z.L.Y.)
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China
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