1
|
Calise DG, Park SC, Bok JW, Goldman GH, Keller NP. An oxylipin signal confers protection against antifungal echinocandins in pathogenic aspergilli. Nat Commun 2024; 15:3770. [PMID: 38704366 PMCID: PMC11069582 DOI: 10.1038/s41467-024-48231-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 04/23/2024] [Indexed: 05/06/2024] Open
Abstract
Aspergillus fumigatus is the leading causative agent of life-threatening invasive aspergillosis in immunocompromised individuals. One antifungal class used to treat Aspergillus infections is the fungistatic echinocandins, semisynthetic drugs derived from naturally occurring fungal lipopeptides. By inhibiting beta-1,3-glucan synthesis, echinocandins cause both fungistatic stunting of hyphal growth and repeated fungicidal lysis of apical tip compartments. Here, we uncover an endogenous mechanism of echinocandin tolerance in A. fumigatus whereby the inducible oxylipin signal 5,8-diHODE confers protection against tip lysis via the transcription factor ZfpA. Treatment of A. fumigatus with echinocandins induces 5,8-diHODE synthesis by the fungal oxygenase PpoA in a ZfpA dependent manner resulting in a positive feedback loop. This protective 5,8-diHODE/ZfpA signaling relay is conserved among diverse isolates of A. fumigatus and in two other Aspergillus pathogens. Our findings reveal an oxylipin-directed growth program-possibly arisen through natural encounters with native echinocandin producing fungi-that enables echinocandin tolerance in pathogenic aspergilli.
Collapse
Affiliation(s)
- Dante G Calise
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
- Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, WI, USA
| | - Sung Chul Park
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Jin Woo Bok
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Gustavo H Goldman
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
- National Institute of Science and Technology in Human Pathogenic Fungi, Ribeirão Preto, Brazil
| | - Nancy P Keller
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA.
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI, USA.
| |
Collapse
|
2
|
Devlin L, Okletey J, Perkins G, Bowen JR, Nakos K, Montagna C, Spiliotis ET. Proteomic profiling of the oncogenic septin 9 reveals isoform-specific interactions in breast cancer cells. Proteomics 2021; 21:e2100155. [PMID: 34409731 DOI: 10.1002/pmic.202100155] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 08/05/2021] [Indexed: 02/06/2023]
Abstract
Septins are a family of multimeric GTP-binding proteins, which are abnormally expressed in cancer. Septin 9 (SEPT9) is an essential and ubiquitously expressed septin with multiple isoforms, which have differential expression patterns and effects in breast cancer cells. It is unknown, however, if SEPT9 isoforms associate with different molecular networks and functions. Here, we performed a proteomic screen in MCF-7 breast cancer cells to identify the interactome of GFP-SEPT9 isoforms 1, 4 and 5, which vary significantly in their N-terminal extensions. While all three isoforms associated with SEPT2 and SEPT7, the truncated SEPT9_i4 and SEPT9_i5 interacted with septins of the SEPT6 group more promiscuously than SEPT9_i1, which bound predominately SEPT8. Spatial mapping and functional clustering of non-septin partners showed isoform-specific differences in interactions with proteins of distinct subcellular organelles (e.g., nuclei, centrosomes, cilia) and functions such as cell signalling and ubiquitination. The interactome of the full length SEPT9_i1 was more enriched in cytoskeletal regulators, while the truncated SEPT9_i4 and SEPT9_i5 exhibited preferential and isoform-specific interactions with nuclear, signalling, and ubiquitinating proteins. These data provide evidence for isoform-specific interactions, which arise from truncations in the N-terminal extensions of SEPT9, and point to novel roles in the pathogenesis of breast cancer.
Collapse
Affiliation(s)
- Louis Devlin
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA.,Sanofi Pasteur, Swiftwater, Pennsylvania, USA
| | - Joshua Okletey
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA
| | | | - Jonathan R Bowen
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA
| | - Konstantinos Nakos
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA
| | - Cristina Montagna
- Department of Radiology & Oncology, Rutgers Cancer Institute of New Jersey, New Brunswick, New Jersey, USA
| | - Elias T Spiliotis
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA
| |
Collapse
|
3
|
Fungal oxylipins direct programmed developmental switches in filamentous fungi. Nat Commun 2020; 11:5158. [PMID: 33056992 PMCID: PMC7557911 DOI: 10.1038/s41467-020-18999-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 09/08/2020] [Indexed: 01/08/2023] Open
Abstract
Filamentous fungi differentiate along complex developmental programs directed by abiotic and biotic signals. Currently, intrinsic signals that govern fungal development remain largely unknown. Here we show that an endogenously produced and secreted fungal oxylipin, 5,8-diHODE, induces fungal cellular differentiation, including lateral branching in pathogenic Aspergillus fumigatus and Aspergillus flavus, and appressorium formation in the rice blast pathogen Magnaporthe grisea. The Aspergillus branching response is specific to a subset of oxylipins and is signaled through G-protein coupled receptors. RNA-Seq profiling shows differential expression of many transcription factors in response to 5,8-diHODE. Screening of null mutants of 33 of those transcription factors identifies three transcriptional regulators that appear to mediate the Aspergillus branching response; one of the mutants is locked in a hypo-branching phenotype, while the other two mutants display a hyper-branching phenotype. Our work reveals an endogenous signal that triggers crucial developmental processes in filamentous fungi, and opens new avenues for research on the morphogenesis of filamentous fungi. Fungi produce oxygenated fatty acids, or oxylipins, of unclear function. Here, Niu et al. show that an Aspergillus oxylipin induces various developmental processes in several fungi, including lateral branching in human pathogenic Aspergillus species, and appressorium formation in the plant pathogen Magnaporthe grisea.
Collapse
|
4
|
Renshaw H, Juvvadi PR, Cole DC, Steinbach WJ. The class V myosin interactome of the human pathogen Aspergillus fumigatus reveals novel interactions with COPII vesicle transport proteins. Biochem Biophys Res Commun 2020; 527:232-237. [PMID: 32446373 PMCID: PMC7248123 DOI: 10.1016/j.bbrc.2020.04.111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/21/2020] [Indexed: 11/21/2022]
Abstract
The human fungal pathogen Aspergillus fumigatus causes life-threatening invasive aspergillosis in immunocompromised individuals. Adaptation to the host environment is integral to survival of A. fumigatus and requires the coordination of short- and long-distance vesicular transport to move essential components throughout the fungus. We previously reported the importance of MyoE, the only class V myosin, for hyphal growth and virulence of A. fumigatus. Class V myosins are actin-based, cargo-carrying motor proteins that contain unique binding sites for specific cargo. Specific cargo carried by myosin V has not been identified in any fungus, and previous studies have only identified single components that interact with class V myosins. Here we utilized a mass spectrometry-based whole proteomic approach to identify MyoE interacting proteins in A. fumigatus for the first time. Several proteins previously shown to interact with myosin V through physical and genetic approaches were confirmed, validating our proteomic analysis. Importantly, we identified novel MyoE-interacting proteins, including members of the cytoskeleton network, cell wall synthesis, calcium signaling and a group of coat protein complex II (COPII) proteins involved in the endoplasmic reticulum (ER) to Golgi transport. Furthermore, we analyzed the localization patterns of the COPII proteins, UsoA (Uso1), SrgE (Sec31), and SrgF (Sec23), which suggested a potential role for MyoE in ER to Golgi trafficking.
Collapse
Affiliation(s)
- Hilary Renshaw
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA
| | - Praveen R Juvvadi
- Department of Pediatrics, Duke University Medical Center, Durham, NC, 27710, USA.
| | - D Christopher Cole
- Department of Pediatrics, Duke University Medical Center, Durham, NC, 27710, USA
| | - William J Steinbach
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, 27710, USA; Department of Pediatrics, Duke University Medical Center, Durham, NC, 27710, USA.
| |
Collapse
|
5
|
Juvvadi PR, Moseley MA, Hughes CJ, Soderblom EJ, Lennon S, Perkins SR, Thompson JW, Geromanos SJ, Wildgoose J, Richardson K, Langridge JI, Vissers JPC, Steinbach WJ. Scanning Quadrupole Data-Independent Acquisition, Part B: Application to the Analysis of the Calcineurin-Interacting Proteins during Treatment of Aspergillus fumigatus with Azole and Echinocandin Antifungal Drugs. J Proteome Res 2017; 17:780-793. [PMID: 29251506 DOI: 10.1021/acs.jproteome.7b00499] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Calcineurin is a critical cell-signaling protein that orchestrates growth, stress response, virulence, and antifungal drug resistance in several fungal pathogens. Blocking calcineurin signaling increases the efficacy of several currently available antifungals and suppresses drug resistance. We demonstrate the application of a novel scanning quadrupole DIA method for the analysis of changes in the proteins coimmunoprecipitated with calcineurin during therapeutic antifungal drug treatments of the deadly human fungal pathogen Aspergillus fumigatus. Our experimental design afforded an assessment of the precision of the method as demonstrated by peptide- and protein-centric analysis from eight replicates of the study pool QC samples. Two distinct classes of clinically relevant antifungal drugs that are guideline recommended for the treatment of invasive "aspergillosis" caused by Aspergillus fumigatus, the azoles (voriconazole) and the echinocandins (caspofungin and micafungin), which specifically target the fungal plasma membrane and the fungal cell wall, respectively, were chosen to distinguish variations occurring in the proteins coimmunoprecipitated with calcineurin. Novel potential interactors were identified in response to the different drug treatments that are indicative of the possible role for calcineurin in regulating these effectors. Notably, treatment with voriconazole showed increased immunoprecipitation of key proteins involved in membrane ergosterol biosynthesis with calcineurin. In contrast, echinocandin (caspofungin or micafungin) treatments caused increased immunoprecipitation of proteins involved in cell-wall biosynthesis and septation. Furthermore, abundant coimmunoprecipitation of ribosomal proteins with calcineurin occurred exclusively in echinocandins treatment, indicating reprogramming of cellular growth mechanisms during different antifungal drug treatments. While variations in the observed calcineurin immunoprecipitated proteins may also be due to changes in their expression levels under different drug treatments, this study suggests an important role for calcineurin-dependent cellular mechanisms in response to antifungal treatment of A. fumigatus that warrants future studies.
Collapse
Affiliation(s)
- Praveen R Juvvadi
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Duke University Medical Center , Durham, North Carolina 27710, United States
| | - M Arthur Moseley
- Proteomics and Metabolomics Shared Resource Center for Genomic and Computational Biology, Duke University Medical Center , Durham, North Carolina 27710, United States
| | | | - Erik J Soderblom
- Proteomics and Metabolomics Shared Resource Center for Genomic and Computational Biology, Duke University Medical Center , Durham, North Carolina 27710, United States
| | - Sarah Lennon
- Waters Corporation , Wilmslow SK9 4AX, United Kingdom
| | - Simon R Perkins
- Institute of Integrative Biology, University of Liverpool , Liverpool L69 3BX, United Kingdom
| | - J Will Thompson
- Proteomics and Metabolomics Shared Resource Center for Genomic and Computational Biology, Duke University Medical Center , Durham, North Carolina 27710, United States
| | | | | | | | | | | | - William J Steinbach
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Duke University Medical Center , Durham, North Carolina 27710, United States.,Department of Molecular Genetics and Microbiology, Duke University Medical Center , Durham, North Carolina 27710, United States
| |
Collapse
|