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Bhargavi G, Subbian S. The causes and consequences of trained immunity in myeloid cells. Front Immunol 2024; 15:1365127. [PMID: 38665915 PMCID: PMC11043514 DOI: 10.3389/fimmu.2024.1365127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 03/28/2024] [Indexed: 04/28/2024] Open
Abstract
Conventionally, immunity in humans has been classified as innate and adaptive, with the concept that only the latter type has an immunological memory/recall response against specific antigens or pathogens. Recently, a new concept of trained immunity (a.k.a. innate memory response) has emerged. According to this concept, innate immune cells can exhibit enhanced responsiveness to subsequent challenges, after initial stimulation with antigen/pathogen. Thus, trained immunity enables the innate immune cells to respond robustly and non-specifically through exposure or re-exposure to antigens/infections or vaccines, providing enhanced resistance to unrelated pathogens or reduced infection severity. For example, individuals vaccinated with BCG to protect against tuberculosis were also protected from malaria and SARS-CoV-2 infections. Epigenetic modifications such as histone acetylation and metabolic reprogramming (e.g. shift towards glycolysis) and their inter-linked regulations are the key factors underpinning the immune activation of trained cells. The integrated metabolic and epigenetic rewiring generates sufficient metabolic intermediates, which is crucial to meet the energy demand required to produce proinflammatory and antimicrobial responses by the trained cells. These factors also determine the efficacy and durability of trained immunity. Importantly, the signaling pathways and regulatory molecules of trained immunity can be harnessed as potential targets for developing novel intervention strategies, such as better vaccines and immunotherapies against infectious (e.g., sepsis) and non-infectious (e.g., cancer) diseases. However, aberrant inflammation caused by inappropriate onset of trained immunity can lead to severe autoimmune pathological consequences, (e.g., systemic sclerosis and granulomatosis). In this review, we provide an overview of conventional innate and adaptive immunity and summarize various mechanistic factors associated with the onset and regulation of trained immunity, focusing on immunologic, metabolic, and epigenetic changes in myeloid cells. This review underscores the transformative potential of trained immunity in immunology, paving the way for developing novel therapeutic strategies for various infectious and non-infectious diseases that leverage innate immune memory.
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Affiliation(s)
| | - Selvakumar Subbian
- Public Health Research Institute, New Jersey Medical School, Rutgers University, Newark, NJ, United States
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Bhargavi G, Mallakuntla MK, Kale D, Tiwari S. Rv0687 a Putative Short-Chain Dehydrogenase is indispensable for pathogenesis of Mycobacterium tuberculosis. bioRxiv 2023:2023.12.12.571312. [PMID: 38168250 PMCID: PMC10760034 DOI: 10.1101/2023.12.12.571312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Mycobacterium tuberculosis (Mtb), a successful human pathogen, resides in host sentinel cells and combats the stressful intracellular environment induced by reactive oxygen and nitrogen species during infection. Mtb employs several evasion mechanisms in the face of the host as a survival strategy, including detoxifying enzymes as short-chain dehydrogenases/ reductases (SDRs) to withstand host-generated insults. In this study, using specialized transduction we have generated a Rv0687 deletion mutant and its complemented strain and investigated the functional role of Rv0687, a member of SDRs family genes in Mtb pathogenesis. Wildtype (WT) and mutant Mtb strain lacking Rv0687 (RvΔ0687) were tested for in-vitro stress response and in-vivo survival in macrophages and mice models of infection. The study demonstrates that Rv0687 is crucial for sustaining bacterial growth in nutrition-limited conditions. The deletion of Rv0687 elevated the sensitivity of Mtb to oxidative and nitrosative stress-inducing agents. Furthermore, the lack of Rv0687 compromised the survival of Mtb in primary bone marrow macrophages and led to an increase in the levels of the secreted proinflammatory cytokines TNF-α, and MIP-1α. Interestingly, the growth of WT and RvΔ0687 was similar in the lungs of infected immunocompromised mice however, a significant reduction in RvΔ0687 growth was observed in the spleen of immunocompromised Rag -/- mice at 4 weeks post-infection. Moreover Rag -/- mice infected with RvΔ0687 survived longer compared to WT Mtb strain. Additionally, we observed significant reduction in bacterial burden in spleens and lungs of immunocompetent C57BL/6 mice infected with RvΔ0687 compared to complemented and WT Mtb strains. Collectively, this study reveals that Rv0687 plays a role in Mtb pathogenesis.
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Togre NS, Vargas AM, Bhargavi G, Mallakuntla MK, Tiwari S. Fragment-Based Drug Discovery against Mycobacteria: The Success and Challenges. Int J Mol Sci 2022; 23:ijms231810669. [PMID: 36142582 PMCID: PMC9500838 DOI: 10.3390/ijms231810669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/10/2022] [Accepted: 09/10/2022] [Indexed: 11/29/2022] Open
Abstract
The emergence of drug-resistant mycobacteria, including Mycobacterium tuberculosis (Mtb) and non-tuberculous mycobacteria (NTM), poses an increasing global threat that urgently demands the development of new potent anti-mycobacterial drugs. One of the approaches toward the identification of new drugs is fragment-based drug discovery (FBDD), which is the most ingenious among other drug discovery models, such as structure-based drug design (SBDD) and high-throughput screening. Specialized techniques, such as X-ray crystallography, nuclear magnetic resonance spectroscopy, and many others, are part of the drug discovery approach to combat the Mtb and NTM global menaces. Moreover, the primary drawbacks of traditional methods, such as the limited measurement of biomolecular toxicity and uncertain bioavailability evaluation, are successfully overcome by the FBDD approach. The current review focuses on the recognition of fragment-based drug discovery as a popular approach using virtual, computational, and biophysical methods to identify potent fragment molecules. FBDD focuses on designing optimal inhibitors against potential therapeutic targets of NTM and Mtb (PurC, ArgB, MmpL3, and TrmD). Additionally, we have elaborated on the challenges associated with the FBDD approach in the identification and development of novel compounds. Insights into the applications and overcoming the challenges of FBDD approaches will aid in the identification of potential therapeutic compounds to treat drug-sensitive and drug-resistant NTMs and Mtb infections.
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Bhargavi G, Singh AK, Patil SA, Palaniyandi K. A putative short-chain dehydrogenase Rv0148 of Mycobacterium tuberculosis affects bacterial survival and virulence. Current Research in Microbial Sciences 2022; 3:100113. [PMID: 35243448 PMCID: PMC8861579 DOI: 10.1016/j.crmicr.2022.100113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/27/2022] [Accepted: 02/10/2022] [Indexed: 12/17/2022] Open
Affiliation(s)
- Gunapati Bhargavi
- ICMR-National Institute for Research in Tuberculosis, Chennai, India
| | - Amit Kumar Singh
- ICMR- National JALMA Institute for Leprosy & Other Mycobacterial Diseases, Agra, India
| | - Shripad A. Patil
- ICMR- National JALMA Institute for Leprosy & Other Mycobacterial Diseases, Agra, India
| | - Kannan Palaniyandi
- ICMR-National Institute for Research in Tuberculosis, Chennai, India
- Corresponding author.
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Refaya AK, Bhargavi G, Mathew NC, Rajendran A, Krishnamoorthy R, Swaminathan S, Palaniyandi K. A review on bovine tuberculosis in India. Tuberculosis (Edinb) 2020; 122:101923. [DOI: 10.1016/j.tube.2020.101923] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 03/12/2020] [Accepted: 03/20/2020] [Indexed: 01/03/2023]
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Bhargavi G, Hassan S, Balaji S, Tripathy SP, Palaniyandi K. Protein-protein interaction of Rv0148 with Htdy and its predicted role towards drug resistance in Mycobacterium tuberculosis. BMC Microbiol 2020; 20:93. [PMID: 32295519 PMCID: PMC7161113 DOI: 10.1186/s12866-020-01763-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 03/23/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Mycobacterium tuberculosis resides inside host macrophages during infection and adapts to resilient stresses generated by the host immune system. As a response, M. tuberculosis codes for short-chain dehydrogenases/reductases (SDRs). These SDRs are nicotinamide adenine dinucleotide-reliant oxidoreductases involved in cell homeostasis. The precise function of oxidoreductases in bacteria especially M. tuberculosis were not fully explored. This study aimed to know the detail functional role of one of the oxidoreductase Rv0148 in M. tuberculosis. RESULTS In silico analysis revealed that Rv0148 interacts with Htdy (Rv3389) and the protein interactions were confirmed using far western blot. Gene knockout mutant of Rv0148 in M. tuberculosis was constructed by specialized transduction. Macrophage cell line infection with this knockout mutant showed increased expression of pro-inflammatory cytokines. This knockout mutant is sensitive to oxidative, nitrogen, redox and electron transport inhibitor stress agents. Drug susceptibility testing of the deletion mutant showed resistance to first-line drugs such as streptomycin and ethambutol and second-line aminoglycosides such as amikacin and kanamycin. Based on interactorme analysis for Rv0148 using STRING database, we identified 220 most probable interacting partners for Htdy protein. In the Rv0148 knockout mutants, high expression of htdy was observed and we hypothesize that this would have perturbed the interactome thus resulting in drug resistance. Finally, we propose that Rv0148 and Htdy are functionally interconnected and involved in drug resistance and cell homeostasis of M. tuberculosis. CONCLUSIONS Our study suggests that Rv0148 plays a significant role in various functional aspects such as intermediatory metabolism, stress, homeostasis and also in drug resistance.
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Affiliation(s)
- Gunapati Bhargavi
- Department of Immunology, ICMR-National Institute for Research in Tuberculosis, #1, Mayor Sathyamoorthy Road, Chetpet, Chennai, 600031, India
| | - Sameer Hassan
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Subramanyam Balaji
- Department of Immunology, ICMR-National Institute for Research in Tuberculosis, #1, Mayor Sathyamoorthy Road, Chetpet, Chennai, 600031, India
| | - Srikanth Prasad Tripathy
- Department of Immunology, ICMR-National Institute for Research in Tuberculosis, #1, Mayor Sathyamoorthy Road, Chetpet, Chennai, 600031, India
| | - Kannan Palaniyandi
- Department of Immunology, ICMR-National Institute for Research in Tuberculosis, #1, Mayor Sathyamoorthy Road, Chetpet, Chennai, 600031, India.
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Sukanya P, Reddy CVR, Bhargavi G. Synthesis, Crystal Structure, and DNA Binding Studies of the 3-(2-(2-Hydroxybenzylidene)Hydrazinyl)Quinoxalin-2(1H)-One. CRYSTALLOGR REP+ 2020. [DOI: 10.1134/s1063774520010253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Narsimhulu M, Anil Kumar G, Bhargavi G, Srinivas B, Hussain K. Synthesis, crystal structure, thermal, photoluminescent and magnetic properties of a new material: Na2[Ni(C2O4)2(H2O)2].6H2O. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sabithakala T, Bhargavi G, Venkata Ramana Reddy C. Synthesis, Crystal Structure, Electrochemical Properties, and Biological Activity of 2-((1H-Benzimidazol-2-yl)methylamino)acetic Acid. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518040235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bhargavi G, Nageswara Rao P, Renganathan S. Review on the Extraction Methods of Crude oil from all Generation Biofuels in last few Decades. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/330/1/012024] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Pandey P, Kharediya B, Elrez B, Sutter JP, Bhargavi G, Rajasekharan MV, Sunkari SS. Ligand directed structural diversity and magnetism in copper(ii)–azido assemblies with isomeric aminopyridines: synthesis, structure, magnetism and theoretical studies. Dalton Trans 2017; 46:15908-15918. [DOI: 10.1039/c7dt03115g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Ligand geometry and molar ratios play an influential role in directing the supramolecular assemblage and associated magnetic properties as described for the Cu(ii) complexes involving isomeric aminopyridines and azide.
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Affiliation(s)
- Priyanka Pandey
- Department of Chemistry
- Mahila Mahavidylay
- Banaras Hindu University
- Varanasi 221 005
- India
| | - Bhagwan Kharediya
- Department of Chemistry
- Mahila Mahavidylay
- Banaras Hindu University
- Varanasi 221 005
- India
| | - Bahjat Elrez
- CNRS: LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse
- France
- Université de Toulouse
- UPS
| | - J-P. Sutter
- CNRS: LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse
- France
- Université de Toulouse
- UPS
| | - G. Bhargavi
- School of Chemistry
- University of Hyderabad
- Hyderabad 500 046
- India
| | | | - Sailaja S. Sunkari
- Department of Chemistry
- Mahila Mahavidylay
- Banaras Hindu University
- Varanasi 221 005
- India
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Agrawal R, Goyal V, Gupta R, Bhatnagar P, Bhargavi G, Bansal RK. Synthesis, characterization, and insecticidal activity of new tin (IV) complexes. PHOSPHORUS SULFUR 2016. [DOI: 10.1080/10426507.2015.1130048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Rati Agrawal
- Department of Chemistry, The IIS University, Jaipur, Rajasthan, India
| | - Varsha Goyal
- Department of Chemistry, The IIS University, Jaipur, Rajasthan, India
| | - Raakhi Gupta
- Department of Chemistry, The IIS University, Jaipur, Rajasthan, India
| | | | - G. Bhargavi
- Department of Chemistry, University of Hyderabad, Hyderabad, AP, India
| | - Raj K. Bansal
- Department of Chemistry, The IIS University, Jaipur, Rajasthan, India
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Sakthikumar L, Mahalakshmy R, Bhargavi G, Srinivasan N. Synthesis, spectral characterization, and single crystal structure studies of (2-nitro-ethene-1,1-diyl)-bis-((4-isopropyl-benzyl)sulfane). CRYSTALLOGR REP+ 2015. [DOI: 10.1134/s1063774515070196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chikhale R, Thorat S, Pant A, Jadhav A, Thatipamula KC, Bansode R, Bhargavi G, Karodia N, Rajasekharan M, Paradkar A, Khedekar P. Design, synthesis and pharmacological evaluation of pyrimidobenzothiazole-3-carboxylate derivatives as selective L-type calcium channel blockers. Bioorg Med Chem 2015; 23:6689-713. [DOI: 10.1016/j.bmc.2015.09.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 09/03/2015] [Accepted: 09/04/2015] [Indexed: 10/23/2022]
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Thatipamula KC, Bhargavi G, Rajasekharan M. Di-aqua-bridged dinuclear Cu(II) isonicotinate adducts using 2,2′-bipyridine and 1,10-phenanthroline. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.05.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chikhale R, Menghani S, Babu R, Bansode R, Bhargavi G, Karodia N, Rajasekharan MV, Paradkar A, Khedekar P. Development of selective DprE1 inhibitors: Design, synthesis, crystal structure and antitubercular activity of benzothiazolylpyrimidine-5-carboxamides. Eur J Med Chem 2015; 96:30-46. [PMID: 25874329 DOI: 10.1016/j.ejmech.2015.04.011] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 04/02/2015] [Accepted: 04/04/2015] [Indexed: 10/23/2022]
Abstract
Decaprenylphosphoryl-b-D-ribose 20-epimerase (DprE1) is a potential drug target for development of antitubercular agents. Structure based drug discovery approach yielded twenty novel derivatives of benzothiazolylpyrimidine-5-carboxamides (7a-t) which were synthesised by three component one pot reaction involving benzothiazolyl oxobutanamide, thiourea and substituted aromatic benzaldehydes. These derivatives were evaluated for antitubercular activity to determine MIC and compound 7a, 7e, 7f and 7o were found to be potentially active against Mycobacterium tuberculosis (H37Rv). Log P of these compounds was found to be between 2.0 and 3.0 making them suitable for oral dosing. DprE1 selectivity and pharmacokinetic studies were carried out for these compounds of which 7a and 7o were found to be highly selective and bioavailability was found to be above 52% by oral dose. Crystal structure of 7a was studied and molecular packing was determined, it exhibited a triclinic crystal lattice arrangement having hydrogen bonded dimeric arrangement. Drug receptor interactions were studied which exhibited docking in the active site of receptor with hydrogen bonding, hydrophobic interactions, vdW interactions with amino acid residues such as Cys387, Asn385, Lys418, Tyr314, Gln334 and Lys367 respectively. 3D QSAR analysis was carried out by kNN-MFA method to determine and develop theoretical model, best suitable model was found to be based on Simulated Annealing k-Neariest Neighbour Molecular Field Analysis (SA kNN-MFA). The model provided with hydrophobic descriptors in positive side indicating the need of bulky groups, steric and electronegative descriptors in negative coordinates hints with contribution by the electronegative substitutions as favourable and desirable moieties for enhancing the activity. The q(2), q(2)_se and Pred_r(2)se were found to be 0.5000, 0.6404 and 1.0094 respectively. A pharmacophore model was generated which suggested for necessity of aromatic, aliphatic carbon centre and hydrogen bond donor for development of newer DprE1 selective inhibitors.
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Affiliation(s)
- Rupesh Chikhale
- Computer Aided Drug Design Laboratory, Department of Pharmaceutical Sciences, Rashtrasant Tukadoji Maharaj Nagpur University, Mahatma Jyotiba Fuley Shaikshanik Parisar, Amravati Road, Nagpur 440 033, MS, India.
| | - Sunil Menghani
- Computer Aided Drug Design Laboratory, Department of Pharmaceutical Sciences, Rashtrasant Tukadoji Maharaj Nagpur University, Mahatma Jyotiba Fuley Shaikshanik Parisar, Amravati Road, Nagpur 440 033, MS, India
| | - Ramavath Babu
- School of Chemistry, University of Hyderabad, C. R. Rao Road, Hyderabad 500 046, AP, India
| | - Ratnadeep Bansode
- Centre for Pharmaceutical Engineering Science, Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, West Yorkshire, United Kingdom
| | - G Bhargavi
- School of Chemistry, University of Hyderabad, C. R. Rao Road, Hyderabad 500 046, AP, India
| | - Nazira Karodia
- Centre for Pharmaceutical Engineering Science, Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, West Yorkshire, United Kingdom
| | - M V Rajasekharan
- School of Chemistry, University of Hyderabad, C. R. Rao Road, Hyderabad 500 046, AP, India
| | - Anant Paradkar
- Centre for Pharmaceutical Engineering Science, Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, West Yorkshire, United Kingdom
| | - Pramod Khedekar
- Computer Aided Drug Design Laboratory, Department of Pharmaceutical Sciences, Rashtrasant Tukadoji Maharaj Nagpur University, Mahatma Jyotiba Fuley Shaikshanik Parisar, Amravati Road, Nagpur 440 033, MS, India; Centre for Pharmaceutical Engineering Science, Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, West Yorkshire, United Kingdom.
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Sethuram M, Bhargavi G, Dhandapani M, Amirthaganesan G, Nizammohideen M. N (2)-(4-Meth-oxy-salicyl-idene)arginine hemihydrate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1301-2. [PMID: 24109379 PMCID: PMC3793792 DOI: 10.1107/s1600536813019727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 07/16/2013] [Indexed: 11/25/2022]
Abstract
The title compound, C14H20N4O4·0.5H2O [systematic name: (2S)-5-{[amino(iminiumyl)methyl]amino}-2-{[(1Z)-4-methoxy-2-oxidobenzylidene]azaniumyl}pentanoate hemihydrate], has been synthesized by the reaction of l-arginine and 4-methoxysalicylaldehyde and crystallizes with two independent substituted l-arginine molecules and one water molecule of solvation in the asymmetric unit. Each molecule exists as a zwitterion and adopts a Z configuration about the central C=N. The molecular conformation is stabilized by strong intramolecular N—H⋯O hydrogen bonds that generate S(6) and S(10) ring motifs. Intermolecular N—H⋯O and O—H⋯O hydrogen bonds involving also the water molecule and weak intermolecular C—H⋯Owater interactions link the molecules into an infinite one-dimensional ribbon structure extending along the b axis. The known (2S) absolute configuration for l-arginine was invoked. Weak intermolecular C—H⋯π interactions are also present.
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Affiliation(s)
- M Sethuram
- Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641020, Tamil Nadu, India
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Bhargavi G, Rajasekharan MV, Costes JP, Tuchagues JP. A new end-on azido bridged MnIII single-chain magnet and its dimeric single molecule magnet polymorph. Synthesis, structure and magnetic properties of [Mn(5-Clsalpn)N3]n and phenoxo bridged [Mn(5-Clsalpn)N3]2. Dalton Trans 2013; 42:8113-23. [DOI: 10.1039/c3dt31966k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bhargavi G, Rajasekharan M, Costes JP, Tuchagues JP. Synthesis, crystal structure and magnetic properties of dimeric MnIII Schiff base complexes including pseudohalide ligands: Ferromagnetic interactions through phenoxo bridges and single molecule magnetism. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.02.024] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Laxmi K, Bhargavi G, Sireesha B, Devi* CS. INTERACTION OF 2-(2'-HYDROXY)PHENYLBENZOTHIAZOLINE WITH SOME METAL IONS: DETERMINATION OF ITS DISSOCIATION CONSTANT IN AQUO-ORGANIC MEDIA. B CHEM SOC ETHIOPIA 2006. [DOI: 10.4314/bcse.v20i1.21156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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