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Priyanka, Sharma S, Sharma M. Role of PE/PPE proteins of Mycobacterium tuberculosis in triad of host mitochondria, oxidative stress and cell death. Microb Pathog 2024; 193:106757. [PMID: 38908454 DOI: 10.1016/j.micpath.2024.106757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 06/12/2024] [Accepted: 06/18/2024] [Indexed: 06/24/2024]
Abstract
The PE and PPE family proteins of Mycobacterium tuberculosis (Mtb) is exclusively found in pathogenic Mycobacterium species, comprising approximately 8-10 % of the Mtb genome. These emerging virulent factors have been observed to play pivotal roles in Mtb pathogenesis and immune evasion through various strategies. These immunogenic proteins are known to modulate the host immune response and cell-death pathways by targeting the powerhouse of the cell, the mitochondria to support Mtb survival. In this article, we are focused on how PE/PPE family proteins target host mitochondria to induce mitochondrial perturbations, modulate the levels of cellular ROS (Reactive oxygen species) and control cell death pathways. We observed that the time of expression of these proteins at different stages of infection is crucial for elucidating their impact on the cell death pathways and eventually on the outcome of infection. This article focuses on understanding the contributions of the PE/PPE proteins by unravelling the triad of host mitochondria, oxidative stress and cell death pathways that facilitate the Mtb persistence. Understanding the role of these proteins in host cellular pathways and the intricate mechanisms paves the way for the development of novel therapeutic strategies to combat TB infections.
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Affiliation(s)
- Priyanka
- DSKC BioDiscovery Laboratory, Miranda House, and Department of Zoology, University of Delhi, Delhi, 110007, India.
| | - Sadhna Sharma
- DSKC BioDiscovery Laboratory, Miranda House, and Department of Zoology, University of Delhi, Delhi, 110007, India.
| | - Monika Sharma
- DSKC BioDiscovery Laboratory, Miranda House, and Department of Zoology, University of Delhi, Delhi, 110007, India.
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Ullah H, Shi X, Taj A, Cheng L, Yan Q, Sha S, Ahmad, Kang J, Haris M, Ma X, Ma Y. Mycobacterium tuberculosis PE_PGRS38 Enhances Intracellular Survival of Mycobacteria by Inhibiting TLR4/NF-κB-Dependent Inflammation and Apoptosis of the Host. BIOLOGY 2024; 13:313. [PMID: 38785795 PMCID: PMC11118070 DOI: 10.3390/biology13050313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 04/20/2024] [Accepted: 04/27/2024] [Indexed: 05/25/2024]
Abstract
Mycobacterium tuberculosis (Mtb) ranks as the most lethal human pathogen, able to fend off repeated attacks by the immune system or medications. PE_PGRS proteins are hallmarks of the pathogenicity of Mtb and contribute to its antigenic diversity, virulence, and persistence during infection. M. smegmatis is a nonpathogenic mycobacterium that naturally lacks PE_PGRS and is used as a model to express Mtb proteins. PE_PGRS has the capability to evade host immune responses and enhance the intracellular survival of M. smegmatis. Despite the intense investigations into PE_PGRS proteins, their role in tuberculosis remains elusive. We engineered the recombinant M. smegmatis strain Ms-PE_PGRS38. The result shows that PE_PGRS38 is expressed in the cell wall of M. smegmatis. PE_PGRS38 contributes to biofilm formation, confers permeability to the cell wall, and shows variable responses to exogenous stresses. PE_PGRS38 downregulated TLR4/NF-κB signaling in RAW264.7 macrophages and lung tissues of infected mice. In addition, PE_PGRS38 decreased NLRP3-dependent IL-1β release and limited pathogen-mediated inflammasome activity during infection. Moreover, PE_PGRS38 inhibited the apoptosis of RAW264.7 cells by downregulating the expression of apoptotic markers including Bax, cytochrome c, caspase-3, and caspase-9. In a nutshell, our findings demonstrate that PE_PGRS38 is a virulence factor for Mtb that enables recombinant M. smegmatis to survive by resisting and evading the host's immune responses during infection.
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Affiliation(s)
- Hayan Ullah
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
- Department of Microbiology, Dalian Medical University, Dalian 116044, China;
| | - Xiaoxia Shi
- Department of Experimental Teaching Center of Public Health, Dalian Medical University, Dalian 116044, China;
| | - Ayaz Taj
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
| | - Lin Cheng
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
| | - Qiulong Yan
- Department of Microbiology, Dalian Medical University, Dalian 116044, China;
| | - Shanshan Sha
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
| | - Ahmad
- Department of Immunology, Dalian Medical University, Dalian 116044, China;
| | - Jian Kang
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
| | - Muhammad Haris
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
| | - Xiaochi Ma
- Pharmaceutical Research Center, The Second Affiliated Hospital, Dalian Medical University, Dalian 116044, China
| | - Yufang Ma
- Department of Biochemistry and Molecular Biology, Dalian Medical University, Dalian 116044, China; (H.U.); (A.T.); (L.C.); (S.S.); (J.K.); (M.H.)
- Department of Microbiology, Dalian Medical University, Dalian 116044, China;
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Xu A, Yang K, Xu J, Meng X, Liang Q, Huang B, Yang Y, Song H. Mycobacterial PE12 protein promotes bacterial survival through inhibiting cell apoptosis. Vet Microbiol 2024; 288:109922. [PMID: 38086162 DOI: 10.1016/j.vetmic.2023.109922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/03/2023] [Accepted: 11/19/2023] [Indexed: 12/30/2023]
Abstract
Mycobacterial PE_PGRS family proteins play key roles in pathogen-host interaction. However, the function of most PE_PGRS proteins remains unknown. In this study, we characterized the role of PE12 of Mycobacterium bovis (M. bovis) on bacterial growth, bacterial survival, and host cell apoptosis. Transcriptome sequencing of infected THP-1 cells was also performed. Compared to Ms_Vec, we found that M. bovis PE12 did not alter the colony morphology of M. smegmatis. The survival of Ms_PE12 was obviously higher than that of Ms_Vec. Furthermore, PE12 significantly suppressed the apoptosis of THP-1 induced by M. smegmatis infection. Transcriptome analysis results showed that there were 70 downregulated genes in the Ms_PE12 infection group in comparison with the Ms_Vec infection group, and these differentially expressed genes were enriched in 240 downregulated GO terms and 6 KEGG pathways. The downregulated expression genes are involved in cell adhesion, phagocytosis, apoptosis, inflammatory response, glycolysis and transmembrane transporter activity. Taken together, our study reveals that PE12 can suppress apoptosis and inhibit proinflammatory cytokine response. We propose that PE12 is related to macrophage phagocytosis and apoptosis, providing useful information to the pathogenic mechanisms of M. bovis.
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Affiliation(s)
- Ahui Xu
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Ke Yang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Jinxia Xu
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Xiangmiao Meng
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Qiuyun Liang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Bei Huang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China
| | - Yang Yang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China.
| | - Houhui Song
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Research Center for Animal Health Diagnostics & Advanced Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, 666 Wusu Street, Lin'an District, Hangzhou, Zhejiang Province 311300, China.
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Xu T, Wang C, Li M, Wei J, He Z, Qian Z, Wang X, Wang H. Mycobacterium tuberculosis PE_PGRS45 (Rv2615c) Promotes Recombinant Mycobacteria Intracellular Survival via Regulation of Innate Immunity, and Inhibition of Cell Apoptosis. J Microbiol 2024; 62:49-62. [PMID: 38337112 DOI: 10.1007/s12275-023-00101-0] [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: 08/09/2023] [Revised: 11/30/2023] [Accepted: 12/11/2023] [Indexed: 02/12/2024]
Abstract
Tuberculosis (TB), a bacterial infectious disease caused by Mycobacterium tuberculosis (M. tuberculosis), is a significant global public health problem. Mycobacterium tuberculosis expresses a unique family of PE_PGRS proteins that have been implicated in pathogenesis. Despite numerous studies, the functions of most PE_PGRS proteins in the pathogenesis of mycobacterium infections remain unclear. PE_PGRS45 (Rv2615c) is only found in pathogenic mycobacteria. In this study, we successfully constructed a recombinant Mycobacterium smegmatis (M. smegmatis) strain which heterologously expresses the PE_PGRS45 protein. We found that overexpression of this cell wall-associated protein enhanced bacterial viability under stress in vitro and cell survival in macrophages. MS_PE_PGRS45 decreased the secretion of pro-inflammatory cytokines such as IL-1β, IL-6, IL-12p40, and TNF-α. We also found that MS_PE_PGRS45 increased the expression of the anti-inflammatory cytokine IL-10 and altered macrophage-mediated immune responses. Furthermore, PE_PGRS45 enhanced the survival rate of M. smegmatis in macrophages by inhibiting cell apoptosis. Collectively, our findings show that PE_PGRS45 is a virulent factor actively involved in the interaction with the host macrophage.
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Affiliation(s)
- Tao Xu
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Chutong Wang
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Minying Li
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Jing Wei
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Zixuan He
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Zhongqing Qian
- Anhui Provincial Key Laboratory of Immunology in Chronic Diseases, Research Center of Laboratory Medicine, School of Laboratory Medicine, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Xiaojing Wang
- Anhui Province Key Laboratory of Clinical and Preclinical Research in Respiratory Disease, Molecular Diagnosis Center, First Affiliated Hospital, Bengbu Medical University, Bengbu, 233030, People's Republic of China
| | - Hongtao Wang
- Anhui Province Key Laboratory of Clinical and Preclinical Research in Respiratory Disease, Molecular Diagnosis Center, First Affiliated Hospital, Bengbu Medical University, Bengbu, 233030, People's Republic of China.
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Kumar A, Kamuju V, Vivekanandan P. RNA G-quadruplexes inhibit translation of the PE/PPE transcripts in Mycobacterium tuberculosis. J Biol Chem 2024; 300:105567. [PMID: 38103641 PMCID: PMC10801317 DOI: 10.1016/j.jbc.2023.105567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 11/22/2023] [Accepted: 12/08/2023] [Indexed: 12/19/2023] Open
Abstract
The role of RNA G-quadruplexes (rG4s) in bacteria remains poorly understood. High G-quadruplex densities have been linked to organismal stress. Here we investigate rG4s in mycobacteria, which survive highly stressful conditions within the host. We show that rG4-enrichment is a unique feature exclusive to slow-growing pathogenic mycobacteria, and Mycobacterium tuberculosis (Mtb) transcripts contain an abundance of folded rG4s. Notably, the PE/PPE family of genes, unique to slow-growing pathogenic mycobacteria, contain over 50% of rG4s within Mtb transcripts. We found that RNA oligonucleotides of putative rG4s in PE/PPE genes form G-quadruplex structures in vitro, which are stabilized by the G-quadruplex ligand BRACO19. Furthermore, BRACO19 inhibits the transcription of PE/PPE genes and selectively suppresses the growth of Mtb but not Mycobacterium smegmatis or other rapidly growing bacteria. Importantly, the stabilization of rG4s inhibits the translation of Mtb PE/PPE genes (PPE56, PPE67, PPE68, PE_PGRS39, and PE_PGRS41) ectopically expressed in M. smegmatis or Escherichia coli. In addition, the rG4-mediated reduction in PE/PPE protein levels attenuates proinflammatory response upon infection of THP-1 cells. Our findings shed new light on the regulation of PE/PPE genes and highlight a pivotal role for rG4s in Mtb transcripts as regulators of post-transcriptional translational control. The rG4s in mycobacterial transcripts may represent potential drug targets for newer therapies.
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Affiliation(s)
- Ashish Kumar
- Kusuma School of Biological Sciences, Indian Institute of Technology, New Delhi, India
| | - Vinay Kamuju
- Department of Biochemical Engineering & Biotechnology, Indian Institute of Technology, New Delhi, India
| | - Perumal Vivekanandan
- Kusuma School of Biological Sciences, Indian Institute of Technology, New Delhi, India.
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Rahlwes KC, Dias BR, Campos PC, Alvarez-Arguedas S, Shiloh MU. Pathogenicity and virulence of Mycobacterium tuberculosis. Virulence 2023; 14:2150449. [PMID: 36419223 PMCID: PMC9817126 DOI: 10.1080/21505594.2022.2150449] [Citation(s) in RCA: 36] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) is the causative agent of tuberculosis, an infectious disease with one of the highest morbidity and mortality rates worldwide. Leveraging its highly evolved repertoire of non-protein and protein virulence factors, Mtb invades through the airway, subverts host immunity, establishes its survival niche, and ultimately escapes in the setting of active disease to initiate another round of infection in a naive host. In this review, we will provide a concise synopsis of the infectious life cycle of Mtb and its clinical and epidemiologic significance. We will also take stock of its virulence factors and pathogenic mechanisms that modulate host immunity and facilitate its spread. Developing a greater understanding of the interface between Mtb virulence factors and host defences will enable progress toward improved vaccines and therapeutics to prevent and treat tuberculosis.
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Affiliation(s)
- Kathryn C. Rahlwes
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Beatriz R.S. Dias
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Priscila C. Campos
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Samuel Alvarez-Arguedas
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Michael U. Shiloh
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA,Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX, USA,CONTACT Michael U. Shiloh
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Medha, Joshi H, Sharma S, Sharma M. Elucidating the function of hypothetical PE_PGRS45 protein of Mycobacterium tuberculosis as an oxido-reductase: a potential target for drug repurposing for the treatment of tuberculosis. J Biomol Struct Dyn 2023; 41:10009-10025. [PMID: 36448553 DOI: 10.1080/07391102.2022.2151514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 11/19/2022] [Indexed: 06/17/2023]
Abstract
Mycobacterium tuberculosis (Mtb) encodes a total of 67 PE_PGRS proteins and definite functions of many of them are still unknown. This study reports PE_PGRS45 (Rv2615c) protein from Mtb as NADPH dependent oxido-reductase having substrate specificity for fatty acyl Coenzyme A. Computational studies predicted PE_PGRS45 to be an integral membrane protein of Mtb. Expression of PE_PGRS45 in non-pathogenic Mycobacterium smegmatis, which does not possess PE_PGRS genes, confirmed its membrane localization. This protein was observed to have NADPH binding motif. Experimental validation confirmed its NADPH dependent oxido-reductase activity (Km value = 34.85 ± 9.478 μM, Vmax = 96.77 ± 7.184 nmol/min/mg of protein). Therefore, its potential to be targeted by first line anti-tubercular drug Isoniazid (INH) was investigated. INH was predicted to bind within the active site of PE_PGRS45 protein and experiments validated its inhibitory effect on the oxido-reductase activity of PE_PGRS45 with IC50/Ki values of 5.66 μM. Mtb is resistant to first line drugs including INH. Therefore, to address the problem of drug resistant TB, docking and Molecular Dynamics (MD) simulation studies between PE_PGRS45 and three drugs (Entacapone, Tolcapone and Verapamil) which are being used in Parkinson's and hypertension treatment were performed. PE_PGRS45 bound the three drugs with similar or better affinity in comparison to INH. Additionally, INH and these drugs bound within the same active site of PE_PGRS45. This study discovered Mtb's PE_PGRS45 protein to have an oxido-reductase activity and could be targeted by drugs that can be repurposed for TB treatment. Furthermore, in-vitro and in-vivo validation will aid in drug-resistant TB treatment. HIGHLIGHTSIn-silico and in-vitro studies of hypothetical protein PE_PGRS45 (Rv2615c) of Mycobacterium tuberculosis (Mtb) reveals it to be an integral membrane proteinPE_PGRS45 protein has substrate specificity for fatty acyl Coenzyme A (fatty acyl CoA) and possess NADPH dependent oxido-reductase activityDocking and simulation studies revealed that first line anti-tubercular drug Isoniazid (INH) and other drugs with anti-TB property have strong affinity for PE_PGRS45 proteinOxido-reductase activity of PE_PGRS45 protein is inhibited by INHPE_PGRS45 protein could be targeted by drugs that can be repurposed for TB treatmentCommunicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Medha
- DSKC Bio Discovery Lab and Department of Zoology, Miranda House, University of Delhi, New Delhi, India
| | - Hemant Joshi
- Laboratory of Molecular Biology and Genetic Engineering, School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Sadhna Sharma
- DSKC Bio Discovery Lab and Department of Zoology, Miranda House, University of Delhi, New Delhi, India
| | - Monika Sharma
- DSKC Bio Discovery Lab and Department of Zoology, Miranda House, University of Delhi, New Delhi, India
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Guo F, Wei J, Song Y, Li B, Qian Z, Wang X, Wang H, Xu T. Immunological effects of the PE/PPE family proteins of Mycobacterium tuberculosis and related vaccines. Front Immunol 2023; 14:1255920. [PMID: 37841250 PMCID: PMC10569470 DOI: 10.3389/fimmu.2023.1255920] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 08/25/2023] [Indexed: 10/17/2023] Open
Abstract
Tuberculosis (TB) is a chronic infectious disease caused by Mycobacterium tuberculosis (Mtb), and its incidence and mortality are increasing. The BCG vaccine was developed in the early 20th century. As the most widely administered vaccine in the world, approximately 100 million newborns are vaccinated with BCG every year, which has saved tens of millions of lives. However, due to differences in region and race, the average protective rate of BCG in preventing tuberculosis in children is still not high in some areas. Moreover, because the immune memory induced by BCG will weaken with the increase of age, it is slightly inferior in preventing adult tuberculosis, and BCG revaccination cannot reduce the incidence of tuberculosis again. Research on the mechanism of Mtb and the development of new vaccines against TB are the main strategies for preventing and treating TB. In recent years, Pro-Glu motif-containing (PE) and Pro-Pro-Glu motif-containing (PPE) family proteins have been found to have an increasingly important role in the pathogenesis and chronic protracted infection observed in TB. The development and clinical trials of vaccines based on Mtb antigens are in progress. Herein, we review the immunological effects of PE/PPE proteins and the development of common PE/PPE vaccines.
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Affiliation(s)
- Fangzheng Guo
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
| | - Jing Wei
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
| | - Yamin Song
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
| | - Baiqing Li
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
- Department of Immunology, School of Laboratory, Bengbu Medical College, Bengbu, China
| | - Zhongqing Qian
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
- Department of Immunology, School of Laboratory, Bengbu Medical College, Bengbu, China
| | - Xiaojing Wang
- Anhui Province Key Laboratory of Clinical and Preclinical Research in Respiratory Disease, Bengbu Medical College, Bengbu, China
| | - Hongtao Wang
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
- Department of Immunology, School of Laboratory, Bengbu Medical College, Bengbu, China
| | - Tao Xu
- Research Center of Laboratory, Bengbu Medical College, Bengbu, China
- Anhui Province Key Laboratory of Immunology in Chronic Diseases , Bengbu Medical College, Bengbu, China
- Department of Clinical Laboratory, School of Laboratory, Bengbu Medical College, Bengbu, China
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D'Souza C, Kishore U, Tsolaki AG. The PE-PPE Family of Mycobacterium tuberculosis: Proteins in Disguise. Immunobiology 2023; 228:152321. [PMID: 36805109 DOI: 10.1016/j.imbio.2022.152321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 12/22/2022] [Accepted: 12/27/2022] [Indexed: 12/31/2022]
Abstract
Mycobacterium tuberculosis has thrived in parallel with humans for millennia, and despite our efforts, M. tuberculosis continues to plague us, currently infecting a third of the world's population. The success of M. tuberculosis has recently been attributed, in part, to the PE-PPE family; a unique collection of 168 proteins fundamentally involved in the pathogenesis of M. tuberculosis. The PE-PPE family proteins have been at the forefront of intense research efforts since their discovery in 1998 and whilst our knowledge and understanding has significantly advanced over the last two decades, many important questions remain to be elucidated. This review consolidates and examines the vast body of existing literature regarding the PE-PPE family proteins, with respect to the latest developments in elucidating their evolution, structure, subcellular localisation, function, and immunogenicity. This review also highlights significant inconsistencies and contradictions within the field. Additionally, possible explanations for these knowledge gaps are explored. Lastly, this review poses many important questions, which need to be addressed to complete our understanding of the PE-PPE family, as well as highlighting the challenges associated with studying this enigmatic family of proteins. Further research into the PE-PPE family, together with technological advancements in genomics and proteomics, will undoubtedly improve our understanding of the pathogenesis of M. tuberculosis, as well as identify key targets/candidates for the development of novel drugs, diagnostics, and vaccines.
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Affiliation(s)
- Christopher D'Souza
- Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom
| | - Uday Kishore
- Department of Veterinary Medicine, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Anthony G Tsolaki
- Biosciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge UB8 3PH, United Kingdom.
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Yu X, Huang Y, Li Y, Li T, Yan S, Ai X, Lv X, Fan L, Xie J. Mycobacterium tuberculosis PE_PGRS1 promotes mycobacteria intracellular survival via reducing the concentration of intracellular free Ca 2+ and suppressing endoplasmic reticulum stress. Mol Immunol 2023; 154:24-32. [PMID: 36584479 DOI: 10.1016/j.molimm.2022.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/03/2022] [Accepted: 12/13/2022] [Indexed: 12/29/2022]
Abstract
Mycobacterium tuberculosis (M. tuberculosis) is the causative agent of tuberculosis (TB). And the PE_PGRS family members of M. tuberculosis are closely associated with virulence and antigen presentation but with function largely elusive. PE_PGRS1(Rv0109) contained 7 Ca2+ binding domains of GGXGXD/NXUX (X is any amino acid), which can reduce intracellular Ca2+ surge. In addition, PE_PGRS1 can mitigate the activation of PERK branch in endoplasmic reticulum (ER) stress by down-regulating the expression of CHOP, Bip, p-PERK, p-eIF2α, and ATF4. Interestingly, we found that two splicing variations of Bax/Bcl-2, Baxβ, and Bcl-2α, were differentially expressed after infection with Ms_PE_PGRS1, and may be involved in the regulation of apoptosis. Hence, this study identified that PE_PGRS1 is a novel calcium-associated protein that can decrease intracellular Ca2+ levels and the PERK axis. And the weakening of the PERK-eIF2α-ATF4 axis reduces THP-1 macrophages apoptosis, promotes the survival of mycobacteria in macrophages.
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Affiliation(s)
- Xi Yu
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Yu Huang
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Yuzhu Li
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Tongxin Li
- Chongqing Public Health Medical Center, Southwest University Public Health Hospital, central laboratory, Chongqing 400715, China
| | - Shuangquan Yan
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Xuefeng Ai
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Xi Lv
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China
| | - Lin Fan
- Shanghai Clinic and Research Center of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai Key Laboratory of Tuberculosis, Shanghai 200433, China.
| | - Jianping Xie
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Chongqing 400715, China.
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11
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Matsumura K, Takaki S, Kirikae T. Mycobacterial protein PE_PGRS30 induces macrophage apoptosis through prohibitin 2 mitochondrial function interference. Front Microbiol 2023; 14:1080369. [PMID: 36778852 PMCID: PMC9911437 DOI: 10.3389/fmicb.2023.1080369] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 01/10/2023] [Indexed: 01/28/2023] Open
Abstract
PE_PGRS30 belongs to the PE_PGRS protein family and is characterized by a conserved Pro-Glu (PE) domain and a typically polymorphic GC-rich sequence (PGRS) domain. PE_PGRS30 is a virulence factor of Mycobacterium tuberculosis that induces macrophage cell death. We found that RAW264.7 cells and murine alveolar macrophages underwent apoptosis in response to PE_PGRS30. The host protein prohibitin 2 (PHB2) was identified as a target molecule. PE_PGRS30 and PHB2 interact via the PGRS domain and mitochondrial targeting sequence, respectively. PHB2 overexpression reduced macrophage apoptosis in response to PE_PGRS30. PE_PGRS30 co-localized with PHB2, not in mitochondria, but in lysosomes. The maintenance of mitochondrial structure by PHB2 was impaired in response to the PGRS domain. These results indicated that PE_PGRS30 reduces PHB2 in mitochondria, resulting in mitochondrial dysfunction and cellular apoptosis.
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Affiliation(s)
- Kazunori Matsumura
- Department of Immune Regulation, Research Institute, National Center for Global Health and Medicine, Chiba, Japan
| | - Satoshi Takaki
- Department of Immune Regulation, Research Institute, National Center for Global Health and Medicine, Chiba, Japan
| | - Teruo Kirikae
- Graduate School of Medicine, Juntendo University, Tokyo, Japan,*Correspondence: Teruo Kirikae,
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12
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Bo H, Moure UAE, Yang Y, Pan J, Li L, Wang M, Ke X, Cui H. Mycobacterium tuberculosis-macrophage interaction: Molecular updates. Front Cell Infect Microbiol 2023; 13:1062963. [PMID: 36936766 PMCID: PMC10020944 DOI: 10.3389/fcimb.2023.1062963] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 02/13/2023] [Indexed: 03/06/2023] Open
Abstract
Mycobacterium tuberculosis (Mtb), the causative agent of Tuberculosis (TB), remains a pathogen of great interest on a global scale. This airborne pathogen affects the lungs, where it interacts with macrophages. Acidic pH, oxidative and nitrosative stressors, and food restrictions make the macrophage's internal milieu unfriendly to foreign bodies. Mtb subverts the host immune system and causes infection due to its genetic arsenal and secreted effector proteins. In vivo and in vitro research have examined Mtb-host macrophage interaction. This interaction is a crucial stage in Mtb infection because lung macrophages are the first immune cells Mtb encounters in the host. This review summarizes Mtb effectors that interact with macrophages. It also examines how macrophages control and eliminate Mtb and how Mtb manipulates macrophage defense mechanisms for its own survival. Understanding these mechanisms is crucial for TB prevention, diagnosis, and treatment.
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Affiliation(s)
- Haotian Bo
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Ulrich Aymard Ekomi Moure
- The Ninth People's Hospital of Chongqing, Affiliated Hospital of Southwest University, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Yuanmiao Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Jun Pan
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Li Li
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Miao Wang
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Xiaoxue Ke
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
- *Correspondence: Hongjuan Cui, ; Xiaoxue Ke,
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
- Cancer Center, Medical Research Institute, Southwest University, Chongqing, China
- Jinfeng Laboratory, Chongqing, China
- *Correspondence: Hongjuan Cui, ; Xiaoxue Ke,
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13
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Qian J, Hu Y, Zhang X, Chi M, Xu S, Wang H, Zhang X. Mycobacterium tuberculosis PE_PGRS19 Induces Pyroptosis through a Non-Classical Caspase-11/GSDMD Pathway in Macrophages. Microorganisms 2022; 10:microorganisms10122473. [PMID: 36557726 PMCID: PMC9785159 DOI: 10.3390/microorganisms10122473] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 12/10/2022] [Indexed: 12/23/2022] Open
Abstract
The PE/PPE protein family commonly exists in pathogenic species, such as Mycobacterium tuberculosis, suggesting a role in virulence and its maintenance. However, the exact role of most PE/PPE proteins in host-pathogen interactions remains unknown. Here, we constructed a recombinant Mycobacterium smegmatis expressing M. tuberculosis PE_PGRS19 (Ms_PE_PGRS19) and found that PE_PGRS19 overexpression resulted in accelerated bacterial growth in vitro, increased bacterial survival in macrophages, and enhanced cell damage capacity. Ms_PE_PGRS19 also induced the expression of pro-inflammatory cytokines, such as IL-6, TNF-α, IL-1β, and IL-18. Furthermore, we demonstrated that Ms_PE_PGRS19 induced cell pyroptosis by cleaving caspase-11 via a non-classical pathway rather than caspase-1 activation and further inducing the cleavage of gasdermin D, which led to the release of IL-1β and IL-18. To the best of our current knowledge, this is the first report of a PE/PPE family protein activating cell pyroptosis via a non-classical pathway, which expands the knowledge on PE/PPE protein functions, and these pathogenic factors involved in bacterial survival and spread could be potential drug targets for anti-tuberculosis therapy.
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14
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Suo J, Wang X, Zhao R, Ma P, Ge L, Luo T. Mycobacterium tuberculosis PPE7 Enhances Intracellular Survival of Mycobacterium smegmatis and Manipulates Host Cell Cytokine Secretion Through Nuclear Factor Kappa B and Mitogen-Activated Protein Kinase Signaling. J Interferon Cytokine Res 2022; 42:525-535. [PMID: 36178924 DOI: 10.1089/jir.2022.0062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The PE/PPE family proteins of Mycobacterium tuberculosis have been associated with its virulence and interaction with the host immune system. The highly virulent modern lineage of M. tuberculosis possesses a lineage-specific PPE gene (PPE7), which arises from an ancestral mutation and is rarely studied. Here we examined the role of PPE7 in mycobacterial pathogenicity and survival by expressing M. tuberculosis PPE7 in Mycobacterium smegmatis. We show that, PPE7 activates host inflammation by increasing expression of pro-inflammatory cytokines including tumor necrosis factor-alpha (TNF-α), interleukin (IL)-1β, and IL-6, while suppressing the expression of anti-inflammatory cytokines such as IL-10, possibly through the nuclear factor kappa B, ERK1/2, and p38 mitogen-activated protein kinase pathways. Overexpressing PPE7 in M. smegmatis could enhance bacterial intracellular survival of infected macrophages. Furthermore, higher level of bacterial persistence, higher levels of TNF-α, IL-1β, and IL-6 cytokines, and more injury in the lung, liver, and spleen tissues of infected mice has been discovered. In conclusion, PPE7 could manipulate host immune response and increase bacterial persistence.
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Affiliation(s)
- Jing Suo
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
| | - Xinyan Wang
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
| | - Rongchuan Zhao
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
| | - Pengjiao Ma
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
| | - Liang Ge
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
| | - Tao Luo
- Laboratory of Infection and Immunity, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, People's Republic of China
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15
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Pattanaik KP, Sengupta S, Jit BP, Kotak R, Sonawane A. Host-Mycobacteria conflict: Immune responses of the host vs. the mycobacteria TLR2 and TLR4 ligands and concomitant host-directed therapy. Microbiol Res 2022; 264:127153. [DOI: 10.1016/j.micres.2022.127153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/21/2022] [Accepted: 07/29/2022] [Indexed: 12/15/2022]
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16
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Kim JS, Kim HK, Cho E, Mun SJ, Jang S, Jang J, Yang CS. PE_PGRS38 Interaction With HAUSP Downregulates Antimycobacterial Host Defense via TRAF6. Front Immunol 2022; 13:862628. [PMID: 35572598 PMCID: PMC9095961 DOI: 10.3389/fimmu.2022.862628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 04/06/2022] [Indexed: 12/04/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) is the causative pathogen of tuberculosis (TB), which manipulates the host immunity to ensure survival and colonization in the host. Mtb possess a unique family of proteins, named PE_PGRS, associated with Mtb pathogenesis. Thus, elucidation of the functions of PE_PGRS proteins is necessary to understand TB pathogenesis. Here, we investigated the role of PE_PGRS38 binding to herpesvirus-associated ubiquitin-specific protease (HAUSP, USP7) in regulating the activity of various substrate proteins by modulating their state of ubiquitination. We constructed the recombinant PE_PGRS38 expressed in M. smegmatis (Ms_PE_PGRS38) to investigate the role of PE_PGRS38. We found that Ms_PE_PGRS38 regulated the cytokine levels in murine bone marrow-derived macrophages by inhibiting the deubiquitination of tumor necrosis factor receptor-associated factor (TRAF) 6 by HAUSP. Furthermore, the PE domain in PE_PGRS38 was identified as essential for mediating TRAF6 deubiquitination. Ms_PE_PGRS38 increased the intracellular burden of bacteria by manipulating cytokine levels in vitro and in vivo. Overall, we revealed that the interplay between HAUSP and PE_PGRS38 regulated the inflammatory response to increase the survival of mycobacteria.
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Affiliation(s)
- Jae-Sung Kim
- Department of Bionano Technology, Hanyang University, Seoul, South Korea.,Institute of Natural Science & Technology, Hanyang University, Ansan, South Korea
| | - Hyo Keun Kim
- Department of Molecular and Life Science, Hanyang University, Ansan, South Korea.,Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, South Korea
| | - Euni Cho
- Department of Bionano Technology, Hanyang University, Seoul, South Korea.,Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, South Korea
| | - Seok-Jun Mun
- Department of Bionano Technology, Hanyang University, Seoul, South Korea.,Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, South Korea
| | - Sein Jang
- Department of Molecular and Life Science, Hanyang University, Ansan, South Korea.,Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, South Korea
| | - Jichan Jang
- Molecular Mechanisms of Antibiotics, Division of Life Science, Research Institute of Life Science, Department of Bio & Medical Big Data (Brain Korea 21 Four Program), Gyeongsang National University, Jinju, South Korea
| | - Chul-Su Yang
- Department of Molecular and Life Science, Hanyang University, Ansan, South Korea.,Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, South Korea
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17
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Sharma S, Sharma M. Proline-Glutamate/Proline-Proline-Glutamate (PE/PPE) proteins of Mycobacterium tuberculosis: The multifaceted immune-modulators. Acta Trop 2021; 222:106035. [PMID: 34224720 DOI: 10.1016/j.actatropica.2021.106035] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 06/23/2021] [Accepted: 06/29/2021] [Indexed: 12/30/2022]
Abstract
The PE/PPE proteins encoded by seven percent (7%) of Mycobacterium tuberculosis (Mtb) genome are the chief constituents to pathogen's virulence reservoir. The fact that these genes have evolved along ESX secretory system in pathogenic Mtb strains make their investigation very intriguing. There is lot of speculation about the prominent role of these proteins at host pathogen interface and in disease pathogenesis. Nevertheless, the exact function of PE/PPE proteins still remains a mystery which calls for further research targeting these proteins. This article is an effort to document all the facts known so far with regard to these unique proteins which involves their origin, evolution, transcriptional control, and most important their role as host immune-modulators. Our understanding strongly points towards the versatile nature of these PE/PPE proteins as Mtb's host immune sensors and as decisive factors in shaping the outcome of infection. Further investigation on these proteins will surely pave way for newer and effective vaccines and therapeutics to control Tuberculosis (TB).
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Affiliation(s)
- Sadhna Sharma
- DS Kothari Central Interdisciplinary Research Centre and Department of Zoology, Miranda House, University of Delhi, Delhi 110007, India.
| | - Monika Sharma
- DS Kothari Central Interdisciplinary Research Centre and Department of Zoology, Miranda House, University of Delhi, Delhi 110007, India.
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18
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Xie Y, Zhou Y, Liu S, Zhang XL. PE_PGRS: Vital proteins in promoting mycobacterial survival and modulating host immunity and metabolism. Cell Microbiol 2020; 23:e13290. [PMID: 33217152 DOI: 10.1111/cmi.13290] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 11/04/2020] [Accepted: 11/08/2020] [Indexed: 12/20/2022]
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (M. tb), is the leading infectious cause of mortality worldwide. One of the key reasons for M. tb pathogenesis is the capability of M. tb to evade immune elimination and survive in macrophage, eventually causing chronic infection. However the pathogenicity mechanism of M. tb is not unclear yet, and thus diagnosis and therapy for TB remains a challenge. The genome of M. tb, encodes a unique protein family known as the PGRS family, with largely unexplored functions. Recently, an increasing number of reports have shown that the PE_PGRS proteins play critical roles in bacterial pathogenesis and immune evasion. The PE_PGRS protein family, characterized by a special N-terminal PE (Pro (P)-Glu (E) motif) domain and a C-terminal PGRS (Polymorphic GC-rich Repetitive Sequences) domain, is restricted mainly to pathogenic mycobacteria. Here we summarize current literature on the PE_PGRS as vital proteins in promoting bacterial survival and modulating host immunity, cell death and metabolism. We also highlight the potential of PE_PGRS as novel targets of anti-mycobacterial interventions for TB control.
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Affiliation(s)
- Yan Xie
- Hubei Province Key Laboratory of Allergy and Immunology, Department of Allergy Zhongnan Hospital, Department of Immunology Wuhan University School of Basic Medical Sciences, Wuhan, China.,State Key Laboratory of Virology, Frontier Science Center for Immunology and Metabolism, Wuhan University School of Medicine, Wuhan, China
| | - Yidan Zhou
- Department of Microbiology, University of Illinois at Urbana-Champaign, Champaign, Illinois, USA
| | - Sheng Liu
- Hubei Province Key Laboratory of Allergy and Immunology, Department of Allergy Zhongnan Hospital, Department of Immunology Wuhan University School of Basic Medical Sciences, Wuhan, China
| | - Xiao-Lian Zhang
- Hubei Province Key Laboratory of Allergy and Immunology, Department of Allergy Zhongnan Hospital, Department of Immunology Wuhan University School of Basic Medical Sciences, Wuhan, China.,State Key Laboratory of Virology, Frontier Science Center for Immunology and Metabolism, Wuhan University School of Medicine, Wuhan, China
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19
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Qian J, Chen R, Wang H, Zhang X. Role of the PE/PPE Family in Host-Pathogen Interactions and Prospects for Anti-Tuberculosis Vaccine and Diagnostic Tool Design. Front Cell Infect Microbiol 2020; 10:594288. [PMID: 33324577 PMCID: PMC7726347 DOI: 10.3389/fcimb.2020.594288] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/31/2020] [Indexed: 12/13/2022] Open
Abstract
The pe/ppe genes are found in pathogenic, slow-growing Mycobacterium tuberculosis and other M. tuberculosis complex (MTBC) species. These genes are considered key factors in host-pathogen interactions. Although the function of most PE/PPE family proteins remains unclear, accumulating evidence suggests that this family is involved in M. tuberculosis infection. Here, we review the role of PE/PPE proteins, which are believed to be linked to the ESX system function. Further, we highlight the reported functions of PE/PPE proteins, including their roles in host cell interaction, immune response regulation, and cell fate determination during complex host-pathogen processes. Finally, we propose future directions for PE/PPE protein research and consider how the current knowledge might be applied to design more specific diagnostics and effective vaccines for global tuberculosis control.
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Affiliation(s)
- Jianing Qian
- State Key Laboratory of Genetic Engineering, School of Life Science, Fudan University, Shanghai, China
| | - Run Chen
- State Key Laboratory of Genetic Engineering, School of Life Science, Fudan University, Shanghai, China
| | - Honghai Wang
- State Key Laboratory of Genetic Engineering, School of Life Science, Fudan University, Shanghai, China
| | - Xuelian Zhang
- State Key Laboratory of Genetic Engineering, School of Life Science, Fudan University, Shanghai, China.,Shanghai Engineering Research Center of Industrial Microorganisms, Fudan University, Shanghai, China
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20
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Xu Y, Yu J, Ma C, Gong Z, Wu X, Deng G. Impact of knockdown LincRNA-Cox2 on apoptosis of macrophage infected with Bacillus Calmette-Guérin. Mol Immunol 2020; 130:85-95. [PMID: 33250268 DOI: 10.1016/j.molimm.2020.11.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 09/23/2020] [Accepted: 11/09/2020] [Indexed: 02/06/2023]
Abstract
Mycobacterium tuberculosis (Mtb)-induced apoptosis of alveolar macrophages plays an important role in the pathogenesis of tuberculosis. Previous studies indicated that massive LncRNAs could deteriorate MTB invasion or latent infection by regulating macrophage's apoptosis. However, whether LincRNA-Cox2 is involved in apoptosis of macrophage infected with Mtb is unclear. In this study, we found Bacillus Calmette-Guerin(BCG)infection induced cell apoptosis with a increasing LincRNA-Cox2 expression in RAW264.7 cells. Furthermore, the activation of TLR signal pathway elevated the expression of lincRNA-Cox2. In this regard, we used small interfering RNA to explore the role of LincRNA-Cox2 on regulating apoptosis of RAW264.7 cells infected with BCG. The results showed that si-LincRNA-Cox2 was capable of increased the expression of apoptosis-associated proteins and accumulation of ROS in BCG-infected RAW264.7 cells. Mechanically, si-LincRNA-Cox2 facilitated BCG-induced macrophage apoptosis by activating the intrinsic apoptotic pathway as well as increased the genes expression of PERK/eIF2α/CHOP. These results provide novel insights into host-pathogen interactions and highlight the potential role of LincRNA-Cox2 in regulating apoptosis induced by BCG-infection.
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Affiliation(s)
- Yanan Xu
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China
| | - Jialin Yu
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China
| | - Chenjie Ma
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China
| | - Zhaoqian Gong
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China
| | - Xiaoling Wu
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China.
| | - Guangcun Deng
- Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, NingXia University, NingXia, Yinchuan, 750021, China; School of Life Science, NingXia University, NingXia, Yinchuan, 750021, China.
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21
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Intelligent Mechanisms of Macrophage Apoptosis Subversion by Mycobacterium. Pathogens 2020; 9:pathogens9030218. [PMID: 32188164 PMCID: PMC7157668 DOI: 10.3390/pathogens9030218] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/12/2020] [Accepted: 03/15/2020] [Indexed: 02/07/2023] Open
Abstract
Macrophages are one of the first innate defense barriers and play an indispensable role in communication between innate and adaptive immune responses, leading to restricted Mycobacterium tuberculosis (Mtb) infection. The macrophages can undergo programmed cell death (apoptosis), which is a crucial step to limit the intracellular growth of bacilli by liberating them into extracellular milieu in the form of apoptotic bodies. These bodies can be taken up by the macrophages for the further degradation of bacilli or by the dendritic cells, thereby leading to the activation of T lymphocytes. However, Mtb has the ability to interplay with complex signaling networks to subvert macrophage apoptosis. Here, we describe the intelligent strategies of Mtb inhibition of macrophages apoptosis. This review provides a platform for the future study of unrevealed Mtb anti-apoptotic mechanisms and the design of therapeutic interventions.
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