New Insights into the Diversity, Structure, Function and Evolution of Pore-Forming Toxins

A special issue of Toxins (ISSN 2072-6651).

Deadline for manuscript submissions: 31 May 2024 | Viewed by 1387

Special Issue Editor


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Guest Editor
Department of Molecular and Biomedical Sciences, Josef Stefan Institute, 1000 Ljubljana, Slovenia
Interests: molecular evolution; adaptive evolution of toxins; evolution of animal toxin multigene families; functional diversification after gene duplication; PLA2 and BPTI neurotoxins; phylogenomic analysis of protein superfamilies; structure–function relationships; regulatory evolution; genome evolution
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Special Issue Information

Dear Colleagues,

Pore-forming proteins (PFPs) are found in all kingdoms of life and are involved in host–pathogen interactions. In most cases, they are used as pore-forming toxins (PFTs) to either attack and invade other organisms or defend against them. As such, they can be found in many pathogenic bacteria as well as in animal venom. However, those that do not act as toxins are involved in other physiological processes, such as the proper functionality of the immune system, neuronal development, or the digestion of food. PFPs are a broad class of molecules that comprise various families, structural folds, and assembly pathways. A comparison between the types of PFTs reveals that the pore-forming domain is a common module, yet the receptor-binding domain is highly variable. The PFTs produced by different organisms target distinct host membranes by interacting with membrane sugars, lipids, and protein receptors or receptor-like molecules by recognizing specific structural motifs. These structural and architectural variations lead to differences in target recognition and determine the site of activity. PFTs have evolved recognition mechanisms to bind specific receptors that define their host tropism, although this can be remarkably diverse even within the same family. In the past decade, advances in this field have revealed in detail the astonishing complexity of the architecture and dynamics of PFTs, and significant progress has been made in the mechanistic description of pore formation in the different families. The focus of this Special Issue of Toxins will be on all aspects of pore-forming toxins, presenting the latest discoveries regarding their diversity, structure, function, and evolution, to provide readers with an up-to-date and comprehensive picture of this exciting area of research.

Dr. Dušan Kordiš
Guest Editor

Manuscript Submission Information

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Keywords

  • pore-forming toxins
  • structure–function relationship
  • evolution
  • protein architecture
  • protein superfamilies

Published Papers (1 paper)

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Research

25 pages, 10662 KiB  
Article
New Insights into Interactions between Mushroom Aegerolysins and Membrane Lipids
by Larisa Lara Popošek, Nada Kraševec, Gregor Bajc, Urška Glavač, Matija Hrovatin, Žan Perko, Ana Slavič, Miha Pavšič, Kristina Sepčić and Matej Skočaj
Toxins 2024, 16(3), 143; https://doi.org/10.3390/toxins16030143 - 09 Mar 2024
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Abstract
Aegerolysins are a family of proteins that recognize and bind to specific membrane lipids or lipid domains; hence they can be used as membrane lipid sensors. Although aegerolysins are distributed throughout the tree of life, the most studied are those produced by the [...] Read more.
Aegerolysins are a family of proteins that recognize and bind to specific membrane lipids or lipid domains; hence they can be used as membrane lipid sensors. Although aegerolysins are distributed throughout the tree of life, the most studied are those produced by the fungal genus Pleurotus. Most of the aegerolysin-producing mushrooms code also for proteins containing the membrane attack complex/perforin (MACPF)-domain. The combinations of lipid-sensing aegerolysins and MACPF protein partners are lytic for cells harboring the aegerolysin membrane lipid receptor and can be used as ecologically friendly bioinsecticides. In this work, we have recombinantly expressed four novel aegerolysin/MACPF protein pairs from the mushrooms Heterobasidion irregulare, Trametes versicolor, Mucidula mucida, and Lepista nuda, and compared these proteins with the already studied aegerolysin/MACPF protein pair ostreolysin A6–pleurotolysin B from P. ostreatus. We show here that most of these new mushroom proteins can form active aegerolysin/MACPF cytolytic complexes upon aegerolysin binding to membrane sphingolipids. We further disclose that these mushroom aegerolysins bind also to selected glycerophospholipids, in particular to phosphatidic acid and cardiolipin; however, these interactions with glycerophospholipids do not lead to pore formation. Our results indicate that selected mushroom aegerolysins show potential as new molecular biosensors for labelling phosphatidic acid. Full article
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