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https://www.readbyqxmd.com/read/28533370/insect-pathogenic-fungus-interacts-with-the-gut-microbiota-to-accelerate-mosquito-mortality
#1
Ge Wei, Yiling Lai, Guandong Wang, Huan Chen, Fang Li, Sibao Wang
The insect gut microbiota plays crucial roles in modulating the interactions between the host and intestinal pathogens. Unlike viruses, bacteria, and parasites, which need to be ingested to cause disease, entomopathogenic fungi infect insects through the cuticle and proliferate in the hemolymph. However, interactions between the gut microbiota and entomopathogenic fungi are unknown. Here we show that the pathogenic fungus Beauveria bassiana interacts with the gut microbiota to accelerate mosquito death. After topical fungal infection, mosquitoes with gut microbiota die significantly faster than mosquitoes without microbiota...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28399190/expression-of-the-insect-metalloproteinase-inhibitor-impi-in-the-fat-body-of-galleria-mellonella-exposed-to-infection-with-beauveria-bassiana
#2
Lidiia Vertyporokh, Iwona Wojda
The inducible metalloproteinase inhibitor (IMPI) discovered in Galleria mellonella is currently the only specific inhibitor of metalloproteinases found in animals. Its role is to inhibit the activity of metalloproteinases secreted by pathogenic organisms as virulence factors to degrade immune-relevant polypeptides of the infected host. This is a good example of an evolutionary arms race between the insect hosts and their natural pathogens. In this report, we analyze the expression of a gene encoding an inducible metalloproteinase inhibitor (IMPI) in fat bodies of the greater wax moth larvae Galleria mellonella infected with an entomopathogenic fungus Beauveria bassiana...
April 11, 2017: Acta Biochimica Polonica
https://www.readbyqxmd.com/read/28292241/microbial-pest-control-agents-are-they-a-specific-and-safe-tool-for-insect-pest-management
#3
Caroline Deshayes, Myriam Siegwart, David Pauron, Josy-Anne Froger, Bruno Lapied, Véronique Apaire-Marchais
Microorganisms (viruses, bacteria and fungi) or their bioactive agents can be used as active substances and therefore are referred as Microbial Pest Control Agents (MPCA). They are used as alternative strategies to chemical insecticides to counteract the development of resistances and to reduce adverse effects on both environment and human health. These natural entomopathogenic agents, which have specific modes of action, are generally considered safer as compared to conventional chemical insecticides. Baculoviruses are the only viruses being used as the safest biological control agents...
March 14, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28276124/two-eisosome-proteins-play-opposite-roles-in-autophagic-control-and-sustain-cell-integrity-function-and-pathogenicity-in-beauveria-bassiana
#4
Long-Bin Zhang, Li Tang, Sheng-Hua Ying, Ming-Guang Feng
Pil1A and Pil1B are two core eisosome proteins that are homologous to yeast Pil1/Lsp1 or filamentous fungal Pil1A/Pil1B but have been unexplored in entomopathogenic fungi. Here we examined subcellular localization and functions of Pil1A and Pil1B in Beauveria bassiana, a fungal insect pathogen. Either localization or co-localization experiments of the two proteins demonstrated that Pil1A and Pil1B were simultaneously localized at the periphery of hyphal cells for formation of stable, punctuate spots in B. bassiana...
March 9, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28262388/enzymatic-comparison-and-mortality-of-beauveria-bassiana-against-cabbage-caterpillar-pieris-brassicae-linn
#5
Manish Dhawan, Neelam Joshi
Beauveria bassiana, an entomopathogenic fungus, is the alternative biocontrol agent exploited against major economic crop pests. Pieris brassicae L. is an emerging pest of the Brassicaceae family. Therefore, in the present study, fungal isolates of Beauveria bassiana, viz. MTCC 2028, MTCC 4495, MTCC 6291, and NBAII-11, were evaluated for their virulence against third instar larvae of P. brassicae. Among all these fungal isolates, maximum mortality (86.66%) was recorded in B. bassiana MTCC 4495 at higher concentration of spores (10(9)conidia/ml), and the minimum mortality (30...
February 16, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/27995045/in-vitro-interaction-of-metarhizium-anisopliae-ma9236-and-beauveria-bassiana-bb9205-with-heterorhabditis-bacteriophora-hni0100-for-the-control-of-plutella-xylostella
#6
J P Correa-Cuadros, A Sáenz-Aponte, M X Rodríguez-Bocanegra
The diamondback moth (Plutella xylostella) is a major pest of broccoli crops in Colombia. To control P. xylostella, we evaluated the interaction of Beauveria bassiana Bb9205 and Metarhizium anisopliae Ma9236 with Heterorhabditis bacteriophora HNI0100 and its bacterial symbiont Photorhabdus luminescens HNI0100. We used antagonism and disk diffusion assays with fungal extracts to test the interaction between symbiotic bacterium and fungi. P. luminescens inhibited the growth of B. bassiana and M. anisopliae up to 40% by the secretion of secondary metabolites, whereas fungal extracts did not inhibit P...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27754403/label-free-differential-proteomics-and-quantification-of-exoenzymes-from-isolates-of-the-entomopathogenic-fungus-beauveria-bassiana
#7
Giuseppe Dionisio, Per Kryger, Tove Steenberg
Beauveria bassiana is an entomopathogenic fungus that grows both in vivo and in vitro. In vivo it can colonize live insect hosts, and tissue digestion occurs by secreted hydrolytic exoenzymes. It can also colonize dead insect tissue provided this is free from competing microorganisms. Depending on whether the host is alive or dead the expression (quality/quantity) of the exoenzymes may vary. We have grown several isolates of B. bassiana in shaking flasks for 120 h at 25 °C in order to evaluate the maximal exoenzyme production using two diet regimes...
October 14, 2016: Insects
https://www.readbyqxmd.com/read/27693371/jak-stat-signaling-pathway-mediated-immune-response-in-silkworm-bombyx-mori-challenged-by-beauveria-bassiana
#8
Tao Geng, Ding-Ding Lv, Yu-Xia Huang, Cheng-Xiang Hou, Guang-Xing Qin, Xi-Jie Guo
Innate immunity was critical in insects defensive system and able to be induced by Janus kinase/signal transducer and activator of transcription cascade transduction (JAK/STAT) signaling pathway. Currently, it had been identified many JAK/STAT signaling pathway-related genes in silkworm, but little function was known on insect innate immunity. To explore the roles of JAK/STAT pathway in antifungal immune response in silkworm (Bombyx mori) against Beauveria bassiana infection, the expression patterns of B. mori C-type lectin 5 (BmCTL5) and genes encoding 6 components of JAK/STAT signaling pathway in silkworm challenged by B...
December 20, 2016: Gene
https://www.readbyqxmd.com/read/27448694/coevolution-of-parasitic-fungi-and-insect-hosts
#9
REVIEW
Gerrit Joop, Andreas Vilcinskas
Parasitic fungi and their insect hosts provide an intriguing model system for dissecting the complex co-evolutionary processes, which result in Red Queen dynamics. To explore the genetic basis behind host-parasite coevolution we chose two parasitic fungi (Beauveria bassiana and Metarhizium anisopliae, representing the most important entomopathogenic fungi used in the biological control of pest or vector insects) and two established insect model hosts (the greater wax moth Galleria mellonella and the red flour beetle Tribolium castaneum) for which sequenced genomes or comprehensive transcriptomes are available...
August 2016: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/27043942/genome-wide-host-pathogen-interaction-unveiled-by-transcriptomic-response-of-diamondback-moth-to-fungal-infection
#10
Zhen-Jian Chu, Yu-Jun Wang, Sheng-Hua Ying, Xiao-Wei Wang, Ming-Guang Feng
Genome-wide insight into insect pest response to the infection of Beauveria bassiana (fungal insect pathogen) is critical for genetic improvement of fungal insecticides but has been poorly explored. We constructed three pairs of transcriptomes of Plutella xylostella larvae at 24, 36 and 48 hours post treatment of infection (hptI) and of control (hptC) for insight into the host-pathogen interaction at genomic level. There were 2143, 3200 and 2967 host genes differentially expressed at 24, 36 and 48 hptI/hptC respectively...
2016: PloS One
https://www.readbyqxmd.com/read/26496616/antagonism-of-entomopathogenic-fungi-by-bacillus-spp-associated-with-the-integument-of-cicadellids-and-delphacids
#11
Andrea Toledo, Silvina López, Mónica Aulicino, Ana María de Remes-Lenicov, Pedro Balatti
Entomopathogenic fungi are potential tools to biocontrol cicadellids and delphacids, two groups of insects that cause extensive damage to agricultural crops. However, bacteria living on the host cuticle may inhibit fungal growth. In the present work, following the molecular characterization of 10 strains of Bacillus isolated from the integument of cicadellids and delphacids, we selected isolates of the fungi Beauveria bassiana and Metarhizium anisopliae that are resistant to the antimicrobials secreted by these bacterial strains...
June 2015: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/26321153/the-fungistatic-and-fungicidal-effects-of-volatiles-from-metathoracic-glands-of-soybean-attacking-stink-bugs-heteroptera-pentatomidae-on-the-entomopathogen-beauveria-bassiana
#12
Rogério B Lopes, Raul A Laumann, Maria C Blassioli-Moraes, Miguel Borges, Marcos Faria
This study was initially designed to evaluate the differential susceptibility of three soybean-attacking pentatomids to the entomopathogenic fungus Beauveria bassiana in standardized bioassays. Euschistus heros (Eh) was shown to be significantly less susceptible than Chinavia ubica (Cu), whereas Dichelops melacanthus (Dm) adults were highly susceptible to fungal infections. A deeper look at the mechanisms involved in the possible role of volatiles from metathoracic glands on fungal infections was undertaken, and gland extracts from Nezara viridula (Nv), a species known for its resilience to fungal infections, were also included in the assays...
November 2015: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/26056261/tenebrionid-secretions-and-a-fungal-benzoquinone-oxidoreductase-form-competing-components-of-an-arms-race-between-a-host-and-pathogen
#13
Nicolás Pedrini, Almudena Ortiz-Urquiza, Carla Huarte-Bonnet, Yanhua Fan, M Patricia Juárez, Nemat O Keyhani
Entomopathogenic fungi and their insect hosts represent a model system for examining invertebrate-pathogen coevolutionary selection processes. Here we report the characterization of competing components of an arms race consisting of insect protective antimicrobial compounds and evolving fungal mechanisms of detoxification. The insect pathogenic fungus Beauveria bassiana has a remarkably wide host range; however, some insects are resistant to fungal infection. Among resistant insects is the tenebrionid beetle Tribolium castaneum that produces benzoquinone-containing defensive secretions...
July 14, 2015: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/25912088/assessing-gene-expression-during-pathogenesis-use-of-qrt-pcr-to-follow-toxin-production-in-the-entomopathogenic-fungus-beauveria-bassiana-during-infection-and-immune-response-of-the-insect-host-triatoma-infestans
#14
Luciana S Lobo, Christian Luz, Éverton K K Fernandes, M Patricia Juárez, Nicolás Pedrini
Entomopathogenic fungi secrete toxic secondary metabolites during the invasion of the insect hemocoel as part of the infection process. Although these compounds have been frequently mentioned as virulence factors, the roles of many of them remain poorly understood, including the question of whether they are expressed during the infection process. A major hurdle to this issue remains the low sensitivity of biochemical detection techniques (e.g., HPLC) within the complex samples that may contain trace quantities of fungal molecules inside the insect...
June 2015: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/25453359/til-type-protease-inhibitors-may-be-used-as-targeted-resistance-factors-to-enhance-silkworm-defenses-against-invasive-fungi
#15
Youshan Li, Ping Zhao, Huawei Liu, Xiaomeng Guo, Huawei He, Rui Zhu, Zhonghuai Xiang, Qingyou Xia
Entomopathogenic fungi penetrate the insect cuticle using their abundant hydrolases. These hydrolases, which include cuticle-degrading proteases and chitinases, are important virulence factors. Our recent findings suggest that many serine protease inhibitors, especially TIL-type protease inhibitors, are involved in insect resistance to pathogenic microorganisms. To clarify the molecular mechanism underlying this resistance to entomopathogenic fungi and identify novel genes to improve the silkworm antifungal capacity, we conducted an in-depth study of serine protease inhibitors...
February 2015: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/25429897/production-of-antibacterial-bombyx-mori-cecropin-a-in-mealworm-pathogenic-beauveria-bassiana-erl1170
#16
Se Jin Lee, Jeong Seon Yu, Bruce L Parker, Margaret Skinner, Yeon Ho Je, Jae Su Kim
Efforts are underway to produce antimicrobial peptides in yellow mealworms (Tenebrio molitor), which can be developed as more effective and safer animal feed additives. In this work, we expressed Bombyx mori (Bm) cecropin-A in mealworms by the infection of transformed entomopathogenic Beauveria bassiana ERL1170. The active domain of Bm cecropin A gene was tagged with a signal sequence of B. bassiana for extracellular secretion, and the fragment was inserted into ERL1170 by the restriction enzyme-mediated integration method...
January 2015: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/25368323/functional-analysis-of-insect-molting-fluid-proteins-on-the-protection-and-regulation-of-ecdysis
#17
Jie Zhang, Anrui Lu, Lulu Kong, Qiaoli Zhang, Erjun Ling
Molting fluid accumulates between the old and new cuticles during periodical ecdysis in Ecdysozoa. Natural defects in insect ecdysis are frequently associated with melanization (an immunity response) occurring primarily in molting fluids, suggesting that molting fluid may impact immunity as well as affect ecdysis. To address this hypothesis, proteomic analysis of molting fluids from Bombyx mori during three different types of ecdysis was performed. Many proteins were newly identified, including immunity-related proteins, in each molting fluid...
December 26, 2014: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/25194143/a-putative-methyltransferase-mtra-contributes-to-development-spore-viability-protein-secretion-and-virulence-in-the-entomopathogenic-fungus-beauveria-bassiana
#18
Yuqi Qin, Almudena Ortiz-Urquiza, Nemat O Keyhani
The filamentous fungus, Beauveria bassiana, is a ubiquitously distributed insect pathogen, currently used as an alternative to chemical pesticides for pest control. Conidiospores are the means by which the fungus disseminates in the environment, and these cells also represent the infectious agent most commonly used in field applications. Little, however, is known concerning the molecular basis for maintenance of spore viability, a critical feature for survival and persistence. Here, we report on the role of a putative methyltransferase, BbmtrA, in conidial viability, normal fungal growth and development, and virulence, via characterization of a targeted gene knockout strain...
November 2014: Microbiology
https://www.readbyqxmd.com/read/25016341/bbsnf1-contributes-to-cell-differentiation-extracellular-acidification-and-virulence-in-beauveria-bassiana-a-filamentous-entomopathogenic-fungus
#19
Xiu-Xiu Wang, Pu-Hong He, Ming-Guang Feng, Sheng-Hua Ying
SNF1/AMPK protein kinase plays important roles in fungal development and activation of catabolite-repressed genes. In this study, we characterized the role of the Beauveria bassiana SNF1 ortholog. The vegetative growth of the ΔBbSNF1 mutant was reduced by 16 to 50 % on diverse carbon/nitrogen sources. Transcriptional analysis revealed a collection of proteases and chitinases that were not induced when the mutant was grown on complex carbon/nitrogen sources. BbSNF1 also contributes to extracellular acidification...
October 2014: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/24320078/ablation-of-the-crea-regulator-results-in-amino-acid-toxicity-temperature-sensitivity-pleiotropic-effects-on-cellular-development-and-loss-of-virulence-in-the-filamentous-fungus-beauveria-bassiana
#20
Zhibing Luo, Yuqi Qin, Yan Pei, Nemat O Keyhani
For most organisms, carbon and nitrogen uptake are essential for growth, development and, where applicable, pathogenesis. The role of the carbon catabolite repressor transcription factor homologue BbcreA in the entomopathogenic fungus Beauveria bassiana was investigated. Deletion of BbcreA resulted in pleiotropic effects, including nutrient toxicity, leading to a novel cell lytic phenotype. Fungal growth in rich media and minimal media containing select amino acids/peptides was severely compromised, with microscopic examination revealing conidial-base germ tube degeneration and cell lysis occurring during growth, a phenomenon exacerbated at higher temperatures (32°C)...
April 2014: Environmental Microbiology
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