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Abstract
Ralstonia solanacearum species complex (RSSC) strains are devastating plant pathogens distributed worldwide. The primary cell density-dependent gene expression system in RSSC strains is phc quorum sensing (QS). It regulates the expression of about 30% of all genes, including those related to cellular activity, primary and secondary metabolism, pathogenicity, and more. The phc regulatory elements encoded by the phcBSRQ operon and phcA gene play vital roles. RSSC strains use methyl 3-hydroxymyristate (3-OH MAME) or methyl 3-hydroxypalmitate (3-OH PAME) as the QS signal. Each type of RSSC strain has specificity in generating and receiving its QS signal, but their signaling pathways might not differ significantly. In this review, I describe the genetic and biochemical factors involved in QS signal input and the regulatory network and summarize control of the phc QS system, new cell-cell communications, and QS-dependent interactions with soil fungi.
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Affiliation(s)
- Kenji Kai
- Graduate School of Agriculture, Osaka Metropolitan University, Osaka, Japan;
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Varshney N, Kashyap D, Behra SK, Saini V, Chaurasia A, Kumar S, Jha HC. Predictive profiling of gram-negative antibiotics in CagA oncoprotein inactivation: a molecular dynamics simulation approach. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2023; 34:501-521. [PMID: 37462112 DOI: 10.1080/1062936x.2023.2230876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 06/24/2023] [Indexed: 07/20/2023]
Abstract
Gastric cancer (GC) is the fifth most prevalent form of cancer worldwide. CagA - positive Helicobacter pylori infects more than 60% of the human population. Moreover, chronic infection of CagA-positive H. pylori can directly affect GC incidence. In the current study, we have repurposed FDA-approved antibiotics that are viable alternatives to current regimens and can potentially be used as combination therapy against the CagA of H. pylori. The 100 FDA-approved gram negative antibiotics were screened against CagA protein using the AutoDock 4.2 tool. Further, top nine compounds were selected based on higher binding affinity with CagA. The trajectory analysis of MD simulations reflected that binding of these drugs with CagA stabilizes the system. Nonetheless, atomic density map and principal component analysis also support the notion of stable binding of antibiotics to the protein. The residues ASP96, GLN100, PRO184, and THR185 of compound cefpiramide, doxycycline, delafloxacin, metacycline, oxytetracycline, and ertapenem were involved in the binding with CagA protein. These residues are crucial for the CagA that aids in entry or pathogenesis of the bacterium. The screened FDA-approved antibiotics have a potential druggability to inhibit CagA and reduce the progression of H. pylori borne diseases.
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Affiliation(s)
- N Varshney
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, India
| | - D Kashyap
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, India
| | - S K Behra
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Ahmedabad, Gandhinagar, India
| | - V Saini
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, India
| | - A Chaurasia
- Division of Crop Protection, ICAR -Indian Institute of Vegetable Research, Varanasi, India
| | - S Kumar
- Division of Agricultural Bioinformatics (CABIN), ICAR-Indian Agricultural Statistics Research Institute (IASRI), Delhi, India
| | - H C Jha
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, Indore, India
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Malviya D, Singh UB, Dehury B, Singh P, Kumar M, Singh S, Chaurasia A, Yadav MK, Shankar R, Roy M, Rai JP, Mukherjee AK, Solanki IS, Kumar A, Kumar S, Singh HV. Novel Insights into Understanding the Molecular Dialogues between Bipolaroxin and the Gα and Gβ Subunits of the Wheat Heterotrimeric G-Protein during Host–Pathogen Interaction. Antioxidants (Basel) 2022; 11:antiox11091754. [PMID: 36139828 PMCID: PMC9495435 DOI: 10.3390/antiox11091754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 07/28/2022] [Accepted: 07/28/2022] [Indexed: 11/22/2022] Open
Abstract
Spot blotch disease of wheat, caused by the fungus Bipolaris sorokiniana (Sacc.) Shoem., produces several toxins which interact with the plants and thereby increase the blightening of the wheat leaves, and Bipolaroxin is one of them. There is an urgent need to decipher the molecular interaction between wheat and the toxin Bipolaroxin for in-depth understanding of host–pathogen interactions. In the present study, we have developed the three-dimensional structure of G-protein alpha subunit from Triticum aestivum. Molecular docking studies were performed using the active site of the modeled G-protein alpha and cryo-EM structure of beta subunit from T. aestivum and ‘Bipolaroxin’. The study of protein–ligand interactions revealed that six H-bonds are mainly formed by Glu29, Ser30, Lys32, and Ala177 of G-alpha with Bipolaroxin. In the beta subunit, the residues of the core beta strand domain participate in the ligand interaction where Lys256, Phe306, and Leu352 formed seven H-bonds with the ligand Bipolaroxin. All-atoms molecular dynamics (MD) simulation studies were conducted for G-alpha and -beta subunit and Bipolaroxin complexes to explore the stability, conformational flexibility, and dynamic behavior of the complex system. In planta studies clearly indicated that application of Bipolaroxin significantly impacted the physio-biochemical pathways in wheat and led to the blightening of leaves in susceptible cultivars as compared to resistant ones. Further, it interacted with the Gα and Gβ subunits of G-protein, phenylpropanoid, and MAPK pathways, which is clearly supported by the qPCR results. This study gives deeper insights into understanding the molecular dialogues between Bipolaroxin and the Gα and Gβ subunits of the wheat heterotrimeric G-protein during host–pathogen interaction.
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Affiliation(s)
- Deepti Malviya
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
| | - Udai B. Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
| | - Budheswar Dehury
- ICMR-Regional Medical Research Centre, Bhubaneswar 751023, India
| | - Prakash Singh
- Department of Plant Breeding and Genetics, Veer Kunwar Singh College of Agriculture, Bihar Agricultural University, Dumraon 802136, India
| | - Manoj Kumar
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
| | - Shailendra Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
| | - Anurag Chaurasia
- ICAR-Indian Institute of Vegetable Research, Varanasi 221305, India
| | | | - Raja Shankar
- ICAR-IIHR, Hessaraghatta Lake Post, Bengaluru 560089, India
| | - Manish Roy
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
| | - Jai P. Rai
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221005, India
| | - Arup K. Mukherjee
- Division of Crop Protection, ICAR-National Rice Research Institute, Cuttack 753006, India
| | | | - Arun Kumar
- Bihar Agricultural University, Bhagalpur 813210, India
| | - Sunil Kumar
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, Library Avenue, PUSA, New Delhi 110012, India
- Correspondence: or (S.K.); or (H.V.S.); Tel.: +91-547-2970727 (H.V.S.); Fax: +91-547-2970726 (H.V.S.)
| | - Harsh V. Singh
- Plant-Microbe Interaction and Rhizosphere Biology Lab, ICAR-National Bureau of Agriculturally Important Microorganisms, Kushmaur, Maunath Bhanjan 275103, India
- Correspondence: or (S.K.); or (H.V.S.); Tel.: +91-547-2970727 (H.V.S.); Fax: +91-547-2970726 (H.V.S.)
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