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Eight diketopiperazines including five previously unreported derivatives were isolated from an endophytic fungus cultured from the medicinal plant Globularia alypum collected in Algeria. The strain was characterised by means of morphological studies and molecular phylogenetic methods and was found to represent a species of a new genus in the Chaetomiaceae, for which we propose the name Batnamyces globulariicola. The taxonomic position of the new genus, which appears phylogenetically related to Stolonocarpus and Madurella, was evaluated by a multi-locus genealogy and by morphological studies in comparison to DNA sequence data reported in the recent monographs of the family. The culture remained sterile on several culture media despite repeated attempts to induce sporulation, and only some chlamydospores were formed. After fermentation in submerged culture and extraction of the cultures with organic solvents, the major secondary metabolites of B. globulariicola were isolated and their chemical structures were elucidated by extensive spectral analysis including nuclear magnetic resonance (NMR) spectroscopy, high-resolution electrospray ionisation mass spectrometry (HRESIMS), and electronic circular dichroism (ECD) measurements. The isolated compounds were tested for their biological activities against various bacteria, fungi, and two mammalian cell lines, but only three of them exhibited weak cytotoxicity against KB3.1 cells, but no antimicrobial effects were observed.

Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to amend the International Code of Nomenclature for algae, fungi, and plants (ICN), allowing DNA sequences alone (of any region and extent) to serve as types of taxon names for voucherless fungi (mainly putative taxa from environmental DNA sequences), have been submitted to be voted on at the 11th International Mycological Congress (Puerto Rico, July 2018). We consider various genetic processes affecting the distribution of alleles among taxa and find that alleles may not consistently and uniquely represent the species within which they are contained. Should the proposals be accepted, the meaning of nomenclatural types would change in a fundamental way from physical objects as sources of data to the data themselves. Such changes are conducive to irreproducible science, the potential typification on artefactual data, and massive creation of names with low information content, ultimately causing nomenclatural instability and unnecessary work for future researchers that would stall future explorations of fungal diversity. We conclude that the acceptance of DNA sequences alone as types of names of taxa, under the terms used in the current proposals, is unnecessary and would not solve the problem of naming putative taxa known only from DNA sequences in a scientifically defensible way. As an alternative, we highlight the use of formulas for naming putative taxa (candidate taxa) that do not require any modification of the ICN. Publisher’s Note A first version of this text was prepared by the first eight authors and the last one, given here. The other listed co-authors in the article PDF support the content, and their actual contributions varied from only support to additions that substantially improved the content. The full details of all co-authors, with their affiliations, are included in Supplementary Table 1 after p.175 of the article for reasons of clarity and space. Slavomír Adamčík Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, 845 23 Bratislava, Slovakia Teuvo Ahti Finnish Museum of Natural History, P.O. Box 7, 00014 University of Helsinki, Finland M. Catherine Aime Purdue University, 915 W. State St., West Lafayette, Indiana 47907, U.S.A. A. Martyn Ainsworth Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, United Kingdom László Albert Hungarian Mycological Society, 1087 Könyves Kálmán krt. 40, Budapest, Hungary Edgardo Albertó Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús, Universidad Nacional de San Martin-Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Alberto Altés García Facultad de Biología, Ciencias Ambientales y Química, Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain Dmitry Ageev SIGNATEC Ltd., 630090, Novosibirsk, Akademgorodok (Novosibirsk Scientific Center), Inzhenernaya str., 22, Russia Reinhard Agerer Ludwig-Maximilians-Universität München, Menzinger Str. 67, 80638 München, Germany Begona Aguirre-Hudson Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, United Kingdom Joe Ammirati University of Washington, Seattle, Washington 98195-1800, U.S.A. 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Moscoso, Apartado 21-9, Santo Domingo, Dominican Republic Vladimír Antonín Moravian Museum, Zeny trh 6, 659 37 Brno, Czech Republic Takayuki Aoki Genetic Resources Center, National Agriculture and Food Research Organization, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan André Aptroot ABL Herbarium, G.v.d.Veenstraat 107, 3762 XK Soest, The Netherlands Didier Argaud 40 rue du Justemont, 57290 Fameck, France Blanca Imelda Arguello Sosa Instituto Tecnológico de Ciudad Victoria, Tecnológico Nacional de México, Ciudad Victoria, Tamaulipas, Mexico Arne Aronsen Torødveien 54, 3135 Torød, Norway Ulf Arup Biological Museum, Lund University, Box 117, 221 00 Lund, Sweden Bita Asgari Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization, Tehran, Iran Boris Assyov Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Str., 1113 Sofia, Bulgaria Violeta Atienza Facultad de Ciencias Biológicas, Universitat de València, C/Dr Moliner 50, 46100, Burjasot, Valencia, Spain Ditte Bandini Panoramastr 47, 69257 Wiesenbach, Germany João Luís Baptista-Ferreira Instituto de Biossistemas e Ciências Integrativas, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal Hans-Otto Baral Blaihofstr. 42, 72074 Tübingen, Germany Tim Baroni The State University of New York, 340 Bowers Hall, P.O. 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Rebriev Southern Scientific Center, Russian Academy of Sciences, 41 Chehova str., Rostov-on-Don, 344006, Russia Juan de Dios Reyes García Paseo Virgen de Linarejos 6 2 D, Linares, Jaen, Spain Miguel Ángel Ribes Ripoll Avda. Pablo Neruda 120 F, 2°D, 28018 Madrid, Spain Franck Richard CEFE UMR5175, CNRS, Université de Montpellier, Université Paul-Valéry Montpellier, EPHE, INSERM, 1919 Route de Mende, 34293 Montpellier Cédex 5, France Mike J. Richardson Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, United Kingdom Víctor J. Rico Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain Gerardo Lucio Robledo Instituto Multidisciplinario de Biología Vegetal, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Córdoba, Casilla de Correo 495, 5000 Córdoba, Argentina Flavia Rodrigues Barbosa Universidade Federal de Mato Grosso, Av. 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Zhurbenko Komarov Botanical Institute of the Russian Academy of Sciences, 2 Prof. Popov Street, St. Petersburg, 197376, Russia The following institutions are also supporting the present text (institutional support means that committees from the mentioned) Asociación Micológica Carlos Spegazzini (Argentina) Austrian Mycological Society (Austria) Croatian Mycological Society (Croatia) Committee of the Czech Scientific Society for Mycology (Czech Republic) The Netherlands Mycological Society (The Netherlands) Sociedad Española de Liquenología (Portugal/Spain) Iberian Mycological Society (which is under constitution, Portugal/Spain) Federación de Asociaciones Micológicas Andaluzas (FAMA) (Spain) Asociación Botánica y Micológica de Jaén (Spain) Asociación Micológica Hispalense Muscaria (Spain) Societat Micològica Valenciana (Spain)

Six novel bioactive bicyclic polyketides (1-6) were isolated from cultures of an endophytic fungus of the medicinal plant Globularia alypum collected in Batna, Algeria. The producer organism was identified as Preussia similis using morphological and molecular phylogenetic methods. The structures of metabolites 1-6, for which the trivial names preussilides A-F are proposed, were elucidated using a combination of spectral methods, including extensive 2D NMR spectroscopy, high-resolution mass spectrometry, and CD spectroscopy. Preussilides were tested for antimicrobial and antiproliferative effects, and, in particular, compounds 1 and 3 showed selective activities against eukaryotes. Subsequent studies on the influence of 1 and 3 on the morphology of human osteosarcoma cells (U2OS) suggest that these two polyketides might target an enzyme involved in coordination of the cell division cycle. Hence, they might, for instance, affect timing or spindle assembly mechanisms, leading to defects in chromosome segregation and/or spindle geometry.

In our ongoing search for new bioactive fungal metabolites, two new cytochalasans were isolated from stromata of the hypoxylaceous ascomycete Hypoxylon fragiforme. Their structures were elucidated via high-resolution mass spectrometry (HR-MS) and nuclear magnetic resonance (NMR) spectroscopy. Together with 23 additional cytochalasans isolated from ascomata and mycelial cultures of different Ascomycota, they were tested on their ability to disrupt the actin cytoskeleton of mammal cells in a preliminary structure&ndash, activity relationship study. Out of all structural features, the presence of hydroxyl group at the C7 and C18 residues, as well as their stereochemistry, were determined as important factors affecting the potential to disrupt the actin cytoskeleton. Moreover, reversibility of the actin disrupting effects was tested, revealing no direct correlations between potency and reversibility in the tested compound group. Since the diverse bioactivity of cytochalasans is interesting for various applications in eukaryotes, the exact effect on eukaryotic cells will need to be determined, e.g., by follow-up studies involving medicinal chemistry and by inclusion of additional natural cytochalasans. The results are also discussed in relation to previous studies in the literature, including a recent report on the anti-Biofilm activities of essentially the same panel of compounds against the pathogenic bacterium, Staphylococcus aureus.

Extracts from an endophytic fungus isolated from the roots of the Algerian plant Globularia alypum showed prominent antimicrobial activity in a screening for novel antibiotics. The producer organism was identified as Dendrothyrium variisporum by means of morphological studies and molecular phylogenetic methods. Studies on the secondary metabolite production of this strain in various culture media revealed that the major components from shake flasks were massarilactones D (1) and H (2) as well as two new furanone derivatives for which we propose the trivial names (5S)-cis-gregatin B (3) and graminin D (4). Scale-up of the fermentation in a 10 L bioreactor yielded massarilactone D and several further metabolites. Among those were three new anthranilic acid derivatives (5-7), two known anthranilic acid analogues (8 and 9) and three cyclopeptides (10-12). Their structures were elucidated on the basis of extensive spectroscopic analysis (1D- and 2D-NMR), high-resolution mass spectrometry (HRESIMS), and the application of the modified Mosher's method. The isolated metabolites were tested for antimicrobial and cytotoxic activities against various bacteria, fungi, and two mammalian cell lines. The new Metabolite 5 and Compound 9 exhibited antimicrobial activity while Compound 9 showed cytotoxicity activity against KB3.1 cells.