Journal of Microbiology

Research Support, Non-U.S. Gov'ts

A Potent Brucella abortus 2308 Δery Live Vaccine Allows for the Differentiation between Natural and Vaccinated Infection: Junbo Zhang , Shuanghong Yin , Fei Guo , Ren Meng , Chuangfu Chen , Hui Zhang , Zhiqiang Li , Qiang Fu , Huijun Shi , Shengwei Hu , Wei Ni , Tiansen Li , Ke Zhang; J. Microbiol. 2014;52(8):681-688. Published online July 4, 2014; DOI: https://doi.org/10.1007/s12275-014-3689-9

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Brucellosis is a globally distributed zoonotic disease that causes animal and human diseases. However, the current Brucella abortus vaccines (S19 and RB51) are deficient; they can cause abortion in pregnant animals. Moreover, when the vaccine S19 is used, tests cannot differentiate natural from vaccinated infection. Therefore, a safer and more potent vaccine is needed. A Brucella abortus 2308 ery promoter mutant (Δery) was constructed to overcome these drawbacks. The growth of the Δery mutant was significantly attenuated in macrophages and mice and induced high protective immunity in mice. Moreover, Δery induced an anti-Brucellaspecific IgG (immunoglobulin G) response and stimulated the expression of interferon-gamma (INF-γ) and interleukin-4 (IL-4). Furthermore, the expression of EryA antigen allowed for the serological differentiation between natural and vaccinated infection in mice. These results indicate that the Δery mutant is a potential attenuated live vaccine candidate against virulent Brucella abortus 2308 (S2308) infection.

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Establishment of picodroplet-based co-culture system to improve erythritol production in Yarrowia lipolytica
Shuang Li, Yuan Zhang, Lu Li, Yaomeng Yuan, Haoxuan Sun, Xin-Hui Xing, Xiaoyan Wang, Chong Zhang
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Characterization of Brucella abortus Mutant A19mut2, a Potential DIVA Vaccine Candidate with a Modification on Lipopolysaccharide
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Changfan Li, Chang Wang, Jiang Zhu, Feng Xue, Xiaoman Sun, Yang Gu
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Insights into irr and rirA gene regulation on the virulence of Brucella melitensis M5-90
Huan Zhang, Benben Wang, Wenxing Wu, Xiaoyu Deng, Zhiran Shao, Jihai Yi, Zhen Wang, Ningning Yang, Yong Wang, Yuanzhi Wang, Chuangfu Chen
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Expression and regulation of the ery operon of Brucella melitensis in human trophoblast cells
Hui Zhang, Xiaoxia Dou, Zhiqiang Li, Yu Zhang, Jing Zhang, Fei Guo, Yuanzhi Wang, Zhen Wang, Tiansen Li, Xinli Gu, Chuangfu Chen
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Protection efficacy of the Brucella abortus ghost vaccine candidate lysed by the N-terminal 24-amino acid fragment (GI24) of the 36-amino acid peptide PMAP-36 (porcine myeloid antimicrobial peptide 36) in murine models
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Tatiane F. Carvalho, João Paulo A. Haddad, Tatiane A. Paixão, Renato L. Santos, Roy Martin Roop
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A Functional and Phylogenetic Comparison of Quorum Sensing Related Genes in Brucella melitensis 16M: Aniel Jessica Leticia Brambila-Tapia , Ernesto Pérez-Rueda; J. Microbiol. 2014;52(8):709-715. Published online July 4, 2014; DOI: https://doi.org/10.1007/s12275-014-3570-x

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Abstract

A quorum-sensing (QS) system is involved in Brucella melitensis survival inside the host cell. Two transcriptional regulators identified in B. melitensis, BlxR and VjbR, regulate the expression of virB, an operon required for bacterial intracellular persistence. In this work, 628 genes affected by VjbR and 124 by BlxR were analyzed to gain insights into their functional and taxonomical distributions among the Bacteria and Archaea cellular domains. In this regard, the Cluster of Orthologous Groups (COG) genes and orthologous genes in 789 nonredundant bacterial and archaeal genomes were obtained and compared against a group of randomly selected genes. From these analyses, we found 71 coaffected genes between VjbR and BlxR. In the COG comparison, VjbR activated genes associated with intracellular trafficking, secretion and vesicular transport and defense mechanisms, while BlxR affected genes related to energy production and conversion (with an equal effect) and translation, ribosomal structure and biogenesis, posttranslational modifications and carbohydrate and amino acid metabolism (with a negative effect). When the taxonomical distribution of orthologous genes was evaluated, the VjbR- and BlxRrelated genes presented more orthologous genes in Crenarchaeota (Archaea), Firmicutes, and Tenericutes and fewer genes in Proteobacteria than expected by chance. These findings suggest that QS system exert a fine-tuning modulation of gene expression, by which VjbR activates genes related to infection persistence and defense, while BlxR represses general bacterial metabolism for intracellular adaptations. Finally, these affected genes present a degree of presence among Bacteria and Archaea genomes that is different from that expected by chance.

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Brucella mediates autophagy, inflammation, and apoptosis to escape host killing
Yaqiong Qin, Gengxu Zhou, Fengyuan Jiao, Chuan Cheng, Chi Meng, Lingjie Wang, Shengping Wu, Cailiang Fan, Jixiang Li, Bo Zhou, Yuefeng Chu, Hanwei Jiao
Frontiers in Cellular and Infection Microbiology.2024;[Epub] CrossRef
The VirB System Plays a Crucial Role in Brucella Intracellular Infection
Xue Xiong, Bowen Li, Zhixiong Zhou, Guojing Gu, Mengjuan Li, Jun Liu, Hanwei Jiao
International Journal of Molecular Sciences.2021; 22(24): 13637. CrossRef
Uncovering the Hidden Credentials ofBrucellaVirulence
R. Martin Roop, Ian S. Barton, Dariel Hopersberger, Daniel W. Martin
Microbiology and Molecular Biology Reviews.2021;[Epub] CrossRef
Rich Repertoire of Quorum Sensing Protein Coding Sequences in CPR and DPANN Associated with Interspecies and Interkingdom Communication
Charles Bernard, Romain Lannes, Yanyan Li, Éric Bapteste, Philippe Lopez, Robert G. Beiko
mSystems.2020;[Epub] CrossRef
BASI74, a Virulence-Related sRNA in Brucella abortus
Hao Dong, Xiaowei Peng, Yufu Liu, Tonglei Wu, Xiaolei Wang, Yanyan De, Tao Han, Lin Yuan, Jiabo Ding, Chuanbin Wang, Qingmin Wu
Frontiers in Microbiology.2018;[Epub] CrossRef

Parallel Gene Loss and Acquisition Among Strains of Different Brucella Species and Biovars: Zhijun Zhong , Yufei Wang , Jie Xu , Yanfen Chen , Yuehua Ke , Xiaoyan Zhou , Xitong Yuan , Dongsheng Zhou , Yi Yang , Ruifu Yang , Guangneng Peng , Hai Jiang , Jing Yuan , Hongbin Song , Buyun Cui , Liuyu Huang , Zeliang Chen; J. Microbiol. 2012;50(4):567-574. Published online August 25, 2012; DOI: https://doi.org/10.1007/s12275-012-2022-8

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Abstract: The genus Brucella is divided into six species; of these, B. melitensis and B. abortus are pathogenic to humans, and B. ovis and B. neotomae are nonpathogenic to humans. The definition of gene loss and acquisition is essential for understanding Brucella’s ecology, evolutionary history, and host relationships. A DNA microarray containing unique genes of B. melitensis Type strain 16MT and B. abortus 9-941 was constructed and used to determine the gene contents of the representative strains of Brucella. Phylogenetic relationships were inferred from sequences of housekeeping genes. Gene loss and acquisition of different Brucella species were inferred. A total of 214 genes were found to be differentially distributed, and 173 of them were clustered into 15 genomic islands (GIs). Evidence of horizontal gene transfer was observed for 10 GIs. Phylogenetic analysis indicated that the 19 strains formed five clades, and some of the GIs had been lost or acquired independently among the different lineages. The derivation of Brucella lineages is concomitant with the parallel loss or acquisition of GIs, indicating a complex interaction between various Brucella species and hosts.

A Genome-Wide Identification of Genes Potentially Associated with Host Specificity of Brucella Species: Kyung Mo Kim , Kyu-Won Kim , Samsun Sung , Heebal Kim; J. Microbiol. 2011;49(5):768-775. Published online November 9, 2011; DOI: https://doi.org/10.1007/s12275-011-1084-3

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Abstract

Brucella species are facultative intracellular pathogenic α-Proteobacteria that can cause brucellosis in humans and domestic animals. The clinical and veterinary importance of the bacteria has led to well established studies on the molecular mechanisms of Brucella infection of host organisms. However, to date, no genome-wide study has scanned for genes related to the host specificity of Brucella spp. The majority of bacterial genes related to specific environmental adaptations such as host specificity are well-known to have evolved under positive selection pressure. We thus detected signals of positive selection for individual orthologous genes among Brucella genomes and identified genes related to host specificity. We first determined orthologous sets from seven completely sequenced Brucella genomes using the Reciprocal Best Hits (RBH). A maximum likelihood analysis based on the branch-site test was accomplished to examine the presence of positive selection signals, which was subsequently confirmed by phylogenetic analysis. Consequently, 12 out of 2,033 orthologous genes were positively selected by specific Brucella lineages, each of which belongs to a particular animal host. Extensive literature reviews revealed that half of these computationally identified genes are indeed involved in Brucella host specificity. We expect that this genome-wide approach based on positive selection may be reliably used to screen for genes related to environmental adaptation of a particular species and that it will provide a set of appropriate candidate genes.

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Clade-specific positive selection on a developmental gene: BRANCHLESS TRICHOME and the evolution of stellate trichomes in Physaria (Brassicaceae)
Abigail R. Mazie, David A. Baum
Molecular Phylogenetics and Evolution.2016; 100: 31. CrossRef
Identification of Recombination and Positively Selected Genes in Brucella
Udayakumar S. Vishnu, Jagadesan Sankarasubramanian, Jayavel Sridhar, Paramasamy Gunasekaran, Jeyaprakash Rajendhran
Indian Journal of Microbiology.2015; 55(4): 384. CrossRef
Comparison of Brucella canis genomes isolated from different countries shows multiple variable regions
Miryan Margot Sánchez-Jiménez, Juan Pablo Isaza, Juan F. Alzate, Martha Olivera-Angel
Genomics.2015; 106(1): 43. CrossRef
Complete Genome Sequence of Brucella canis Strain 118, a Strain Isolated from Canine
Guangjun Gao, Jing Li, Tiefeng Li, Zhengfang Zhang, Liping Wang, Xitong Yuan, Yufei Wang, Jie Xu, Yuehua Ke, Liuyu Huang, Dali Wang, Zeliang Chen, Xingran Xu
Journal of Bacteriology.2012; 194(23): 6680. CrossRef
Complete Genome Sequence of Brucella canis BCB018, a Strain Isolated from a Human Patient
Yufei Wang, Yuehua Ke, Qing Zhen, Xitong Yuan, Jie Xu, Yefeng Qiu, Zhoujia Wang, Tiefeng Li, Dali Wang, Liuyu Huang, Zeliang Chen
Journal of Bacteriology.2012; 194(23): 6697. CrossRef

Iron Homeostasis in Brucella abortus: the Role of Bacterioferritin: Marta A. Almirón , Rodolfo A. Ugalde; J. Microbiol. 2010;48(5):668-673. Published online November 3, 2010; DOI: https://doi.org/10.1007/s12275-010-0145-3

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Abstract: Brucella abortus is the etiological agent of bovine brucellosis, an infectious disease of humans and cattle. Its pathogenesis is mainly based on its ability to survive and multiply inside macrophages. It has been demonstrated that if B. abortus ferrochelatase cannot incorporate iron into protoporphyrin IX to synthesize heme, the intracellular replication and virulence in mice is highly attenuated. Therefore, it can be hypothesized that the unavailability of iron could lead to the same attenuation in B. abortus pathogenicity. Thus, the purpose of this work was to obtain a B. abortus derivative unable to keep an internal iron pool and test its ability to replicate under iron limitation. To achieve this, we searched for iron-storage proteins in the genome of brucellae and found bacterioferritin (Bfr) as the sole ferritin encoded. Then, a B. abortus bfr mutant was built up and its capacity to store iron and replicate under iron limitation was investigated. Results indicated that B. abortus Bfr accounts for 70% of the intracellular iron content. Under iron limitation, the bfr mutant suffered from enhanced iron restriction with respect to wild type according to its growth retardation pattern, enhanced sensitivity to oxidative stress, accelerated production of siderophores, and altered expression of membrane proteins. Nonetheless, the bfr mutant was able to adapt and replicate even inside eukaryotic cells, indicating that B. abortus responds to internal iron starvation before sensing external iron availability. This suggests an active role of Bfr in controlling iron homeostasis through the availability of Bfr-bound iron.

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