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beauveria bassiana secreted protein

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
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
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
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
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
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
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
B A Dias, P M O J Neves, L Furlaneto-Maia, M C Furlaneto
A Brazilian isolate of Beauveria bassiana (CG425) that shows high virulence against the coffee berry borer (CBB) was examined for the production of subtilisin-like (Pr1) and trypsin-like (Pr2) cuticle-degrading proteases. Fungal growth was either in nitrate-medium or in CBB cuticle-containing medium under both buffered and unbuffered conditions. In unbuffered medium supplemented with cuticle, the pH of cultures dropped and Pr1 and Pr2 activities were detected in high amounts only at a pH of 5.5 or higher. In buffered cultures, Pr1 and Pr2 activities were higher in medium supplemented with cuticle compared to activities with nitrate-medium...
April 2008: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Jun Xia, Chang-Rong Zhang, Shan Zhang, Fang-Fang Li, Ming-Guang Feng, Xiao-Wei Wang, Shu-Sheng Liu
BACKGROUND: The fungal pathogen, Beauveria bassiana, is an efficient biocontrol agent against a variety of agricultural pests. A thorough understanding of the basic principles of insect-fungus interactions may enable the genetic modification of Beauveria bassiana to enhance its virulence. However, the molecular mechanism of insect response to Beauveria bassiana infection is poorly understood, let alone the identification of fungal virulent factors involved in pathogenesis. METHODOLOGY/PRINCIPAL FINDINGS: Here, next generation sequencing technology was applied to examine the expression of whitefly (Bemisia tabaci) genes in response to the infection of Beauveria bassiana...
2013: PloS One
Yanhua Fan, Almudena Ortiz-Urquiza, Ramsha A Kudia, Nemat O Keyhani
Neuronal calcium sensor proteins and their homologues participate in transducing extracellular signals that affect intracellular Ca(2+) levels, which in turn regulate enzyme activities, secretion, gene expression and other biological processes. The filamentous fungus Beauveria bassiana is a broad-host-range pathogen of insects that acidifies the extracellular milieu during growth and pathogenesis towards target hosts. A collection of B. bassiana random insertion mutants were screened on pH indicator plates and one mutant was isolated that displayed reduced acidification...
July 2012: Microbiology
A Ortiz-Urquiza, L Riveiro-Miranda, C Santiago-Álvarez, E Quesada-Moraga
Fungal virulence has been mostly associated with cuticle-degrading enzymes that can be regulated depending on nutrient conditions. However, few studies have related fungal virulence to insect-toxic secreted proteins. Here, we describe how the presence of secreted toxic proteins may be linked to conidial virulence, which can be affected by nutrient factors. In this study we evaluated: (1) the virulence of the conidia of four Beauveria bassiana strains (EABb 01/103-Su, EABb 01/12-Su, EABb 01/88-Su and EABb 01/110-Su) grown on three different media (malt extract agar (MA), Rice (Rice), Sabouraud dextrose agar (SDA) and harvested from the cadavers of fungal-infected Galleria mellonella larvae (CAD) and (2) the toxicity of the crude soluble protein extracts (CSPEs) obtained from Adamek's liquid medium inoculated with these conidia...
November 2010: Journal of Invertebrate Pathology
Hong You, Hu Wan, Jianhong Li, Byung Rae Jin
Peptidoglycan recognition proteins (PGRPs) are pattern recognition molecules of the innate immune system that recognize peptidoglycan, a unique bacterial cell wall component. Here we cloned and characterized PGRP-S from the bumblebee Bombus ignitus (BiPGRP-S). The BiPGRP-S gene consists of four exons that encode 194 amino acid residues. Comparative analysis indicates that the predicted amino acid sequence of BiPGRP-S shares a high identity with enzymatically active PGRP-S proteins and contains the amino acids required for amidase activity...
September 2010: Developmental and Comparative Immunology
Weiguo Fang, Jin Feng, Yanhua Fan, Yongjun Zhang, Michael J Bidochka, Raymond J St Leger, Yan Pei
Entomopathogenic fungi, such as Beauveria bassiana and Metarhizium anisopliae are being developed as alternatives to chemical insecticides. They infect insects by direct penetration of the cuticle using a combination of physical pressure and extracellular hydrolytic enzymes such as proteases and chitinases. Previously we found that overexpression of a subtilisin-like protease (Pr1A) or a chitinase (Bbchit1) resulted in increased virulence of M. anisopliae and B. bassiana, respectively. In this study, we found that a mixture of the B...
October 2009: Journal of Invertebrate Pathology
Sohail S Qazi, George G Khachatourians
Secretion of catabolic extracellular enzymes (ECE) is the hallmark of the infection of insects through the cuticle by entomopathogenic fungi (EPF). In this paper, we show that germinating conidia of Beauveria bassiana (Bb) regulate the synthesis of ECE through a multiple control mode during the initial stages of germination. We tested Bb conidial growth on aphid exuviae with or without supplementation of additional carbon and/or nitrogen (C/N) compounds. To understand the interrelation between conidial germination during growth, the synthesis of ECE activity, free amino nitrogen (FAN), glucose and fungal dry weight biomass were measured...
June 2008: Archives of Microbiology
Ariane C Donatti, Luciana Furlaneto-Maia, Maria Helena P Fungaro, Márcia C Furlaneto
Extracellular proteases have been shown to be virulence factors in fungal pathogenicity toward insects. We examined the production of extracellular proteases, subtilisin-like activity (Pr1) and trypsin-like activity (Pr2), by Beauveria bassiana CG425, which is a fungus of interest for control of the grasshopper Rhammatocerus schistocercoides. To access the role of these proteases during infection of R. schistocercoides, we analyzed their secretion during fungus growth either in nitrate-medium or in cuticle-containing medium supplemented with different amino acids...
March 2008: Current Microbiology
Akbar Ali Khan Pathan, Koduru Uma Devi, Heiko Vogel, Annette Reineke
The entomopathogen Beauveria bassiana has an extremely diverse insect host range in addition to a saprophytic phase. The molecular basis for this plasticity was investigated by a comparative analysis of gene expression patterns through cDNA-AFLPs of a B. bassiana isolate grown on cuticular extracts of insects of diverse orders as well as synthetic medium. For some of the fragments, expression patterns were verified by Q-RT-PCR. Among the differentially expressed genes two proteases were identified, which are known to be directly involved in the process of pathogenesis in entomopathogenic fungi...
December 2007: Fungal Genetics and Biology: FG & B
Yanhua Fan, Yongjun Zhang, Xingyong Yang, Xiaoqiong Pei, Shujuan Guo, Yan Pei
Beauveria bassiana chitinase (Bbchit1) is an important cuticle degrading enzyme involved in pathogenesis of fungi against insect. To obtain enough active chitinase for performing in vitro functional analysis, Bbchit1 gene was expressed in Escherichia coli and Pichia pastoris, respectively. The high-level production of recombinant Bbchit1 was detected in E. coli expression system, however mainly located in inclusion bodies. Refolding of solubilized inclusion body proteins was achieved by dialysis. In P. pastoris expression system, Bbchit1 was secreted into the culture medium under the induction of methanol...
November 2007: Protein Expression and Purification
Yanhua Fan, Weiguo Fang, Yuehua Xiao, Xingyong Yang, Yongjun Zhang, Michael J Bidochka, Yan Pei
Directed evolution through DNA shuffling and screening was used to enhance the catalytic ability of a fungal, Beauveria bassiana, chitinase, Bbchit1. The Bbchit gene was first linked to various prokaryotic signal sequences and expressed in Escherichia coli. The signal peptide, PelB, from Erwinia carotovora resulted in greatest chitinase secretion into broth. The nucleotide sequence expressing PelB signal peptide was then incorporated into an E. coli vector to express Bbchit1 variants generated by three rounds of DNA shuffling...
August 2007: Applied Microbiology and Biotechnology
André M Murad, Raul A Laumann, Angela Mehta, Eliane F Noronha, Octávio L Franco
The production of cowpea (Vigna unguiculata), an important self-sustained crop in Latin America and Africa, is severely affected by damage by the cowpea weevil Callosobruchus maculatus. The presence of a single larva in stored seeds can lead to losses of almost 40%. Control of C. maculatus currently relies on the inefficient use of chemical insecticides and post-harvest treatments. The use of entomopathogenic fungus became a reliable alternative for coleopteran pest control and has been extensively investigated...
April 2007: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
Aurélien Tartar, Drion G Boucias
The entomopathogen Beauveria bassiana is a dimorphic fungus that displays an in vivo-specific, yeast-like parasitic phase. In order to study the transcriptome of B. bassiana during this unique developmental phase, we developed a method to harvest in vivo B. bassiana cells from infected Manduca sexta larvae. The infected hemolymph was collected just prior to insect death and subjected to gradient centrifugation, which allowed for separation of the B. bassiana in vivo-produced cells from remaining insect hemocytes...
August 2004: Mycopathologia
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