1
|
Kulshrestha A, Maurya S, Gupta T, Roy R, Punnathanam SN, Ayappa KG. Conformational Flexibility Is a Key Determinant for the Lytic Activity of the Pore-Forming Protein, Cytolysin A. J Phys Chem B 2023; 127:69-84. [PMID: 36542809 DOI: 10.1021/acs.jpcb.2c05785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Several bacterial infections are mediated by pore-forming toxins (PFTs), a subclass of proteins that oligomerize on mammalian cell membranes forming lytic nanopores. Cytolysin A (ClyA), an α-PFT, undergoes a dramatic conformational change restructuring its two membrane-binding motifs (the β-tongue and the N-terminus helix), during pore formation. A complete molecular picture for this key transition and the driving force behind the secondary structure change upon membrane binding remain elusive. Using all-atom molecular dynamics (MD) simulations of the ClyA monomer and string method based free energy computations with path collective variables, we illustrate that an unfolded β-tongue motif is an on-pathway intermediate during the transition to the helix-turn-helix motif of the protomer. An aggregate of 28 μs of all-atom thermal unfolding MD simulations of wild-type ClyA and its single point mutants reveal that the membrane-binding motifs of the ClyA protein display high structural flexibility in water. However, point mutations in these motifs lead to a distinct reduction in the flexibility, especially in the β-tongue, thereby stabilizing the pretransition secondary structure. Resistance to unfolding was further corroborated by MD simulations of the β-tongue mutant motif in the membrane. Combined with the thermal unfolding simulations, we posit that the β-tongue as well as N-terminal mutants that lower the tendency to unfold and disorder the β-tongue are detrimental to pore formation by ClyA and its lytic activity. Erythrocyte turbidity and vesicle leakage assays indeed reveal a loss of activity for the β-tongue mutant, and delayed kinetics for the N-terminus mutants. On the other hand, a point mutation in the extracellular domain that did not abrogate lytic activity displayed similar unfolding characteristics as the wild type. Thus, attenuation of conformational flexibility in membrane-binding motifs correlates with reduced lytic and leakage activity. Combined with secondary structure changes observed in the membrane bound states, our study shows that the tendency to unfold in the β-tongue region is a critical step in the conformational transition and bistability of the ClyA protein and mutants that disrupt this tendency reduced pore formation. Overall, our finding suggests that inherent flexibility in the protein could play a wider and hitherto unrecognized role in membrane-mediated conformational transitions of PFTs and other membrane protein transformations.
Collapse
Affiliation(s)
- Avijeet Kulshrestha
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Satyaghosh Maurya
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Twinkle Gupta
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Rahul Roy
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India.,Center for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Sudeep N Punnathanam
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - K Ganapathy Ayappa
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| |
Collapse
|
2
|
Maurya S, Rai VH, Upasani A, Umrao S, Parwana D, Roy R. Single-molecule Diffusion and Assembly on Polymer-crowded Lipid Membranes. J Vis Exp 2022. [DOI: 10.3791/64243] [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: 10/31/2022] Open
|
3
|
Kulshrestha A, Maurya S, Gupta T, Roy R, Punnathanam S, Ayappa G. Conformational flexibility is a key determinant of the lytic activity of the pore forming protein, Cytolysin A. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.1129] [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: 11/29/2022] Open
|
4
|
Jagtap S, K R, Valloly P, Sharma R, Maurya S, Gaigore A, Ardhya C, Biligi DS, Desiraju BK, Natchu UCM, Saini DK, Roy R. Evaluation of spike protein antigens for SARS-CoV-2 serology. J Virol Methods 2021; 296:114222. [PMID: 34197839 PMCID: PMC8239204 DOI: 10.1016/j.jviromet.2021.114222] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/20/2021] [Accepted: 06/26/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND Spike protein domains are being used in various serology-based assays to detect prior exposure to SARS-CoV-2 virus. However, there has been limited comparison of antibody titers against various spike protein antigens among COVID-19 infected patients. METHODS We compared four spike proteins (RBD, S1, S2 and a stabilized spike trimer (ST)) representing commonly used antigens for their reactivity to human IgG antibodies using indirect ELISA in serum from COVID-19 patients and pre-2020 samples. ST ELISA was also compared against the EUROIMMUN IgG ELISA test. Further, we estimated time appropriate IgG and IgA seropositivity rates in COVID-19 patients using a panel of sera samples collected longitudinally from the day of onset of symptoms (DOS). RESULTS Among the four spike antigens tested, the ST demonstrated the highest sensitivity (86.2 %; 95 % CI: 77.8-91.7 %), while all four antigens showed high specificity to COVID-19 sera (94.7-96.8 %). 13.8 % (13/94) of the samples did not show seroconversion in any of the four antigen-based assays. In a double-blinded head-to-head comparison, ST based IgG ELISA displayed a better sensitivity (87.5 %, 95 % CI: 76.4-93.8 %) than the EUROIMMUN IgG ELISA (67.9 %, 95 % CI: 54.8-78.6 %). Further, in ST-based assays, we found 48 % and 50 % seroconversion in the first six days (from DOS) for IgG and IgA antibodies, respectively, which increased to 84 % (IgG) and 85 % (IgA) for samples collected ≥22 days from DOS. CONCLUSIONS Comparison of spike antigens demonstrates that spike trimer protein is a superior option as an ELISA antigen for COVID-19 serology.
Collapse
Affiliation(s)
- Suraj Jagtap
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Ratnasri K
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Priyanka Valloly
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Rakhi Sharma
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Satyaghosh Maurya
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Anushree Gaigore
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Chitra Ardhya
- Department of Pathology, Bangalore Medical College and Research Institute, Bangalore, 560002, India
| | - Dayananda S Biligi
- Department of Pathology, Bangalore Medical College and Research Institute, Bangalore, 560002, India
| | - Bapu Koundinya Desiraju
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, Faridabad, 121001, India
| | | | - Deepak Kumar Saini
- Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India; Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, 560012, India
| | - Rahul Roy
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, India; Centre for BioSystems Science and Engineering, Indian Institute of Science, Bangalore, 560012, India.
| |
Collapse
|
5
|
Jain S, Dhir V, Aggarwal A, Maurya S, Gupta R, Leishangthem B, Khullar A, Dhawan V, Naidu G, Sharma SK, Sharma A, Jain S. AB0276 HOW FAST CAN METHOTREXATE BE ESCALATED IN RHEUMATOID ARTHRITIS? A MULTICENTRE, PARALLEL-GROUP RANDOMIZED CONTROLLED TRIAL (MEIRA). Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.3864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Literature regarding the optimal dose escalation strategy of methotrexate (MTX) in RA is scant and ambiguous (1). Concerns regarding the safety of rapid escalation may lead to delayed attainment of the optimal dose and treatment target.Objectives:To compare the efficacy, safety and tolerability of fast versus usual dose escalation of oral MTX in RA.Methods:This multicenter, open-label (assessor blinded) RCT included patients with active RA (SJC≥2 and TJC≥4) aged 18-55 years, not on DMARDs (except HCQ and/or low-dose prednisolone) and with disease duration <5 years. Patients were randomized 1:1 into two groups with the same starting dose of oral MTX (15 mg/week), but escalated either by 5 mg every 2 weeks (fast escalation group) or 5 mg every 4 weeks (usual escalation group), till a maximum of 25 mg/wk. Primary outcome was proportion of EULAR good responders at 16 weeks. Secondary outcomes were change in DAS28-3 and EULAR responders (good or moderate) at 8 and 16 weeks, change in Indian HAQ at 16 weeks, and symptomatic (questionnaire based) and laboratory adverse effects over 16 weeks. RBC MTX polyglutamate-3 levels were measured using HPLC in both groups. There was an open-label extension phase till 24 weeks (use of other DMARDs was permitted beyond 16 weeks if target was not met), and DAS28-3 at 24 weeks was compared.Trial Reg: CTRI/2018/12/016549Results:178 patients (mean age 39.8 (8.6) years, 84% females) with mean disease duration of 1.9 (1.4) years were randomized (89 in each group). Mean DAS28ESR-3 and DAS28CRP-3 at enrollment were 6.3 (0.9) and 5.4 (1.1). At 16 weeks, there was no significant difference in good EULAR response by DAS28ESR-3 (5.6, 7.9%, p=0.9) or DAS28CRP-3 (28.1, 22.5%, p=0.8) between the two groups (Figure 1). The change in DAS28-ESR-3 at 8, 16 and 24 weeks (or by DASCRP-3, not shown) and improvement in HAQ at 16 weeks were also not significantly different (Table 1). Notably, there was no significant difference in symptomatic GI or CNS adverse effects, incidence of cytopenia, transaminitis or rates of drug discontinuation. RBC MTX polyglutamate-3 levels at 8 and 16 weeks were also similar (Table 1).Table 1.Key secondary efficacy and safety outcomesParameterUsualFastp-valueEfficacyDelta DAS28-ESR-3 (Mean±SD) -8 wk -ITT (n=178)-0.9 ± 1.0-0.8 ± 0.90.5 -PP (n=139)-1.2 ± 1.0-1.1 ± 1.00.5 -16 wk -ITT-1.3 ± 1.1-1.3 ± 1.00.9 -PP-1.6 ± 1.1-1.6 ± 0.91 -24 wk -ITT-1.6 ± 1.3-1.5 ± 1.10.3 -PP-2.1 ± 1.2-1.8 ± 1.10.14Delta Indian HAQ (16 wk)-0.7 ± 0.6-0.8 ± 0.60.2Adverse effectsSerious AE00-Death00-Symptomatic AE ever* n (%)Vomiting7 (8)7 (8)1Nausea22 (26)26 (30)0.5Stomach ache16 (19)17 (20)0.9Loss of appetite/bad taste21 (25)27 (31)0.3Lethargy20 (24)21 (25)1Dizziness19 (23)16 (19)0.5Irritability/anxiety14 (16)14 (16)1Laboratory AE ever* [n/N times done (%)]Transaminitis episodes (>40IU/L)52/224 (23)52/219 (24)0.9 -Significant (>80 IU/L)5/224 (2)8/219 (4)0.4Thrombocytopenia episodes (<150000/uL)10/224 (5)13/218 (6)0.5 -Significant (<100000/uL)2/224 (1)2/218 (1)1Leucopenia episodes (<4000/uL)2/224 (1)3/220 (1.5)0.8 -Significant (<3500/uL)1/224 (0.5)2/220 (1)0.8Methotrexate levelsMTX-polyglutamate-3 (nmol/L)-8 wk25.8 ± 10.526.9 ± 13.60.6-16 wk40.7 ± 20.940.1 ± 23.40.9*Ever=any time during the studyITT= intention-to-treat, PP=per-protocol, AE=adverse effectFigure 1.EULAR response and change in DAS28ESR-3 over timeConclusion:A faster escalation of MTX (5 mg every 2 weeks) reaching 25 mg/week by 4 weeks did not have a significantly higher rate of adverse effects (symptomatic or laboratory) compared to an escalation by 5 mg every 4 weeks. Although not more efficacious, it may shorten the time to recognize MTX failure, and optimize treat-to-target.References:[1]Visser K, Katchamart W, Loza E, et al. Multinational evidence-based recommendations for the use of methotrexate in rheumatic disorders with a focus on RA: integrating systematic literature research and expert opinion of a broad international panel of rheumatologists in the 3E Initiative. Ann Rheum Dis. 2009;68(7):1086–93Disclosure of Interests:None declared
Collapse
|
6
|
Maurya S, Vishweshwaraiah S, Ayappa G, Roy R. Pore Assembly of Bacterial Alpha Pore-Forming Toxin (αPFT), Cytolysin a on Lipid Membranes. Biophys J 2020. [DOI: 10.1016/j.bpj.2019.11.2093] [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: 11/24/2022] Open
|
7
|
Kapoor AK, Maurya S, Geeta .. Hypoplastic Bone Marrow Failure in a Patient with Hereditary Persistence of Foetal Haemoglobin (HPFH) Trait. J Clin Diagn Res 2020. [DOI: 10.7860/jcdr/2020/43368.13546] [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: 11/24/2022]
|
8
|
Rajesh S, Shankar V, Haritha C, Bhaskar P, Bhange A, Samy K, Maurya S, Basu T, Lohith G. Intra-Fraction Motion in Frameless Trigeminal Radiosurgery. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1297] [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: 10/26/2022]
|
9
|
Sen D, Shankar V, Haritha C, Bhaskar P, Samy K, Bhange A, Maurya S, Lohith G. DTI Derived Metrics As Response Prognosticate Tool in Trigeminal Neuralgia. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1300] [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: 11/27/2022]
|
10
|
Karuppusamy A, Shankar V, Haritha C, Bhange A, Bhaskar V, Maurya S, Ganeshan P, Ajai Kumar B, Mutha S, Purohit R, Chigurupalli K, Vyas H, Deepanjali P. Anatomically Corrected DVH Metrics Accounting for Intrafraction Motion of Esophagus in Dorsal Spine SBRT. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1450] [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: 11/25/2022]
|
11
|
Bhaskar V, Shankar V, Haritha C, Karuppusamy A, Bhange A, Maurya S, Kumar BA, Sen D, Mutha S, Purohit R, Chigurupalli K, Vyas H, Deepanjali P. Dosimetric Analysis of Flat versus Unflat Beams for Frameless Image guided Trigeminal Radiosurgery. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1438] [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: 10/28/2022]
|
12
|
Banerjee S, Maurya S, Roy R. Single-molecule fluorescence imaging: Generating insights into molecular interactions in virology. J Biosci 2018; 43:519-540. [PMID: 30002270] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Single-molecule fluorescence methods remain a challenging yet information-rich set of techniques that allow one to probe the dynamics, stoichiometry and conformation of biomolecules one molecule at a time. Viruses are small (nanometers) in size, can achieve cellular infections with a small number of virions and their lifecycle is inherently heterogeneous with a large number of structural and functional intermediates. Single-molecule measurements that reveal the complete distribution of properties rather than the average can hence reveal new insights into virus infections and biology that are inaccessible otherwise. This article highlights some of the methods and recent applications of single-molecule fluorescence in the field of virology. Here, we have focused on new findings in virus-cell interaction, virus cell entry and transport, viral membrane fusion, genome release, replication, translation, assembly, genome packaging, egress and interaction with host immune proteins that underline the advantage of single-molecule approach to the question at hand. Finally, we discuss the challenges, outlook and potential areas for improvement and future use of single-molecule fluorescence that could further aid our understanding of viruses.
Collapse
Affiliation(s)
- Sunaina Banerjee
- Molecular Biophysics Unit, Indian Institute of Science, Bengaluru, India
| | | | | |
Collapse
|
13
|
Sathyanarayana P, Maurya S, Ravichandran M, Ayappa GK, Visweswariah SS, Roy R. Cholesterol Promotes Cytolysin a Activity by Stabilizing the Intermediates during Pore Formation. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.3687] [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: 11/24/2022] Open
|
14
|
Singh GN, Khetan M, Maurya S. Some Estimation Procedures Under Non-response Using Super Population Model in Two-Occasion Successive Sampling. Proc Natl Acad Sci , India, Sect A Phys Sci 2017. [DOI: 10.1007/s40010-017-0368-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
15
|
Bhandari PS, Sadhotra LP, Bhargava P, Bath AS, Mukherjee MK, Bhatti TS, Maurya S. Multiple nerve transfers for the reanimation of shoulder and elbow functions in irreparable C5, C6 and upper truncal lesions of the brachial plexus. IJNT 2017. [DOI: 10.1016/s0973-0508(08)80008-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
AbstractIn irreparable C5, C6 spinal nerve and upper truncal injuries the proximal root stumps are not available for grafting, hence repair is based on nerve transfer or neurotization. Between Feb 2004 and May 2006, 23 patients with irreparable C5, C6 or upper truncal injuries of the Brachial Plexus underwent multiple nerve transfers to restore the shoulder and elbow functions. Most of them (16 patients) sustained injury following motor cycle accidents. The average denervation period was 5.3 months. Shoulder function was restored by transfer of distal part of spinal accessory nerve to suprascapular nerve, and transfer of radial nerve branch to long head of triceps to the anterior branch of axillary nerve. Elbow function was restored by transfers of ulnar and median nerve fascicles to the biceps and brachialis motor branches of musculocutaneous nerve. All patients recovered shoulder abduction and external rotation; 7 scored M4 and 16 scored M3. Range of abduction averaged 1230(range, 800-1700). Full elbow flexion was restored in all 23 patients; 15 scored M4 and 8 scored M3. Patients with excellent results could lift 5 kgs of weight. Selective nerve transfers close to the target muscle provide an early and good return of functions. There is negligible morbidity in donor nerves. These intraplexal transfers are suitable in all cases of upper brachial plexus injuries.
Collapse
|
16
|
Singh GN, Khetan M, Maurya S. On the use of multi-auxiliary variables to neutralize the effect of non response in two-occasion successive sampling. COMMUN STAT-THEOR M 2017. [DOI: 10.1080/03610926.2015.1065331] [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: 10/21/2022]
Affiliation(s)
- G. N. Singh
- Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - M. Khetan
- Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - S. Maurya
- Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| |
Collapse
|
17
|
Sathyanarayana P, Maurya S, Ayappa G, Visweswariah SS, Roy R. Studying Binding, Conformational Transition and Assembly of E. Coli Cytolysin a Pore Forming Toxin by Single Molecule Fluorescence. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.2833] [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: 11/30/2022] Open
|
18
|
Singh GN, Maurya S, Khetan M. Some effective combinations of available information under non response in two-occasion successive sampling. COMMUN STAT-THEOR M 2017. [DOI: 10.1080/03610926.2014.990105] [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)
- G. N. Singh
- Department of Applied Mathematics, Indian School of Mines, Dhanbad, India
| | - S. Maurya
- Department of Applied Mathematics, Indian School of Mines, Dhanbad, India
| | - M. Khetan
- Department of Applied Mathematics, Indian School of Mines, Dhanbad, India
| |
Collapse
|
19
|
Singh GN, Khetan M, Maurya S. Use of multiauxiliary variables to cope with non response in estimation of current population mean in two-occasion successive sampling. COMMUN STAT-THEOR M 2015. [DOI: 10.1080/03610926.2014.930914] [Citation(s) in RCA: 2] [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: 10/22/2022]
|
20
|
Singh GN, Khetan M, Maurya S. Estimation under non response when it occurs on both occasions in two-occasion successive sampling. COMMUN STAT-THEOR M 2015. [DOI: 10.1080/03610926.2014.911913] [Citation(s) in RCA: 3] [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: 10/22/2022]
|
21
|
Singh GN, Khetan M, Maurya S. Assessment of Exponential Methods of Estimation Under Nonresponse in Two-Occasion Successive Sampling. Journal of Statistical Theory and Practice 2014. [DOI: 10.1080/15598608.2014.938377] [Citation(s) in RCA: 2] [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: 10/25/2022]
|
22
|
Singh GN, Homa F, Maurya S. On the use of several auxiliary variables in estimation of current population mean in successive sampling. COMMUN STAT-THEOR M 2014. [DOI: 10.1080/03610926.2014.895838] [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: 10/25/2022]
|
23
|
Singh GN, Majhi D, Maurya S, Sharma AK. Some Effective Rotation Patterns in Estimation of Population Mean in Two-Occasion Successive Sampling. COMMUN STAT-THEOR M 2013. [DOI: 10.1080/03610926.2013.785000] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
24
|
|
25
|
Singh UP, Singh DP, Maurya S, Maheshwari R, Singh M, Dubey RS, Singh RB. Investigation on the Phenolics of Some Spices Having Pharmacotherapeutic Properties. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/j157v04n04_03] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
26
|
|
27
|
Abstract
Mangoes (Mangifera indica) are rich in phenolic acids as detected by high-performance liquid chromatography. The phenolics have prominent medicinal properties. Among six important commercial mango cultivars (Deshi, Langra, Chausa, Mallika, Dashahari and Amrapali) tannic acid was maximal in Mallika, while gallic acid was maximal in Chausa and all other varieties. Caffeic acid was maximal in Langra followed by Chausa and Amrapali. Many of the pharmacological properties attributed to mango might be due to the presence of phenolic acids in fairly significant amounts.
Collapse
Affiliation(s)
- U P Singh
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, India.
| | | | | | | | | | | | | |
Collapse
|
28
|
Bhandari PS, Sadhotra LP, Bhargava P, Bath AS, Mukherjee MK, Bhatti TS, Maurya S. Effectiveness of intercostal nerves in restoration of elbow flexion in devastating brachial plexus injuries. The Indian Journal of Neurotrauma 2009. [DOI: 10.1016/s0973-0508(09)80027-0] [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: 10/28/2022]
|
29
|
Singh DP, Maurya S, Singh SP, Singh M, Singh UP. Chemotaxonomic variability in Zizyphus mouritiana varieties and its pharmacological properties in relation to human health. ACTA ACUST UNITED AC 2008; 7:229-37. [PMID: 18928144 DOI: 10.1080/15228940802152968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Twenty varieties of ber (Zizyphus mouritiana), namely umaran, katha, bilayati, kaithli, ZG-3, gola, safeda rohtak, takadi, tikari, banarasi karaka, seo, sonaur-2, sonaur-3, ilaichi, mundia murahra, pathan, kakrola gola, seb, golden yellow and chhuhara, were investigated for the presence of phenolic acids in stem bark, leaves and fruits using high performance liquid chromatograph. Results indicated the presence of tannic (retention time (Rt.) 2.76 min), gallic (Rt. 2.86 min), caffeic (Rt. 3.12 min), vanillic (Rt. 3.26 min), ferulic (Rt. 3.42 min), chlorogenic (Rt. 4.16 min) and cinnamic acids (Rt. 4.45 min) in varying amounts in different parts in of these varieties. In fruits of seven varieties, namely, kaithly, sonaur-2, sonaur-3, mundia murahra, pathan, golden yellow and chhuhara, oxalic acid (Rt. 3.00 min) was also detected. Pharmacological properties of phenolic acids of fruits in relation to human health and the possible implications of different phenolic acids in chemotaxonomy of different varieties of ber are discussed.
Collapse
Affiliation(s)
- D P Singh
- Department of Mycology and Plant Pathology, Banaras Hindu University, Varanasi, India
| | | | | | | | | |
Collapse
|
30
|
Nirogi RVS, Kandikere VN, Maurya S, Mudigonda K, Boosi R. Liquid chromatographic-electrospray tandem mass spectrometric method for the quantification of nimodipine in human plasma. Pharmazie 2006; 61:828-34. [PMID: 17069421] [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] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A simple, sensitive and rapid liquid chromatography/electrospray ionization tandem mass spectrometry (LC-MS/MS) method was developed and validated for the quantification of nimodipine, a calcium channel blocker, in human plasma. Following liquid-liquid extraction, the analytes were separated using an isocratic mobile phase on a reverse phase C18 column and analyzed by MS in the multiple reaction monitoring mode using the respective [M + H]+ ions, m/z 419/343 for nimodipine and m/z 409/228 for the IS. The assay exhibited a linear dynamic range of 0.2-50 ng/mL for nimodipine in human plasma. The lower limit of quantification was 200 pg/mL with a relative standard deviation of less than 8%. Acceptable precision and accuracy were obtained for concentrations over the standard curve range. A run time of 3 min for each sample made it possible to analyze more than 250 human plasma samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic, bioavailability or bioequivalence studies.
Collapse
Affiliation(s)
- R V S Nirogi
- Biopharmaceutical Research, Suven Life Sciences Ltd, Serene Chambers, Banjara Hills, Hyderabad, India.
| | | | | | | | | |
Collapse
|
31
|
Chowdhury D, Maurya S, Pandey MB, Pandey VB, Sarma BK, Singh UP. Antifungal Activity of Narceine Methyl Ester and Narceine Isolated from Corydalis longipes Against Some Phytopathogenic Fungi. Mycobiology 2005; 33:206-209. [PMID: 24049502 PMCID: PMC3774888 DOI: 10.4489/myco.2005.33.4.206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2005] [Indexed: 06/02/2023]
Abstract
Narceine methyl ester and narceine are potent alkaloids which were isolated from Corydalis longipes were found effective in vitro at very low concentration, i.e., 100~500 ppm against spore germination of some test plant pathogenic fungi (Alternaria solani, A. tagetica, Cercospora abelmoschi, Curvularia maculans, Erysiphe cichoracearum, E. pisi, Fusarium udum, Helminthosporium oryzae, H. penniseti, Ustilago cynodontis). Among the test, phytopathogens the spores of F. udum, C. maculans and H. penniseti were highly sensitive at 200 ppm. However, spores of E. pisi, A. solani and A. tagetica were less sensitive at low concentration followed by other test fungi. Most of the fungi showed zero or nearly zero percent spore germination at 400 and 500 ppm.
Collapse
Affiliation(s)
- Dibyendu Chowdhury
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221005, India
| | | | | | | | | | | |
Collapse
|
32
|
Sahni S, Maurya S, Singh UP, Singh AK, Singh VP, Pandey VB. Antifungal Activity of Nor-securinine Against Some Phytopathogenic Fungi. Mycobiology 2005; 33:97-103. [PMID: 24049481 PMCID: PMC3774870 DOI: 10.4489/myco.2005.33.2.097] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2005] [Indexed: 05/14/2023]
Abstract
Crude extracts and active principles from medicinal plants have shown potential role in controlling plant diseases in glasshouses as well as in fields as one of the safest and ecofriendly methods. The effect of nor-securinine (an alkaloid) isolated from Phyllanthus amarus has been seen against spore germination of some fungi (Alternaria brassicae, A. solani, Curvularia pennisetti, Curvularia sp., Erysiphe pisi, Helminthosporium frumentacei) as well as pea powdery mildew (Erysiphe pisi) under glasshouse conditions. The sensitivity of fungi to nor-securinine varied considerably. Nor-securinine was effective against most of the fungi. H. frumentacei was more sensitive even at the lowest concentration (1,000 µg/ml). Likewise conidia of E. pisi were also inhibited in partially or completely appressorium formation. Pre-inoculation treatment showed greater efficacy than post-inoculation in inhibiting powdery mildew development on pea plants in a glasshouse. Maximum inhibition occurred at 2000 µg/ml.
Collapse
Affiliation(s)
- Sangita Sahni
- Department of Mycology and Plant Pathology, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi 221005, India
| | | | | | | | | | | |
Collapse
|
33
|
Singh UP, Maurya S, Singh DP. Phenolic acids in neem (Azadirachta indica): a major pre-existing secondary metabolites. J Herb Pharmacother 2005; 5:35-43. [PMID: 16093234] [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] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
High Performance Liquid Chromatographic (HPLC) analyses of various parts (fresh and dry bark of stem, mature and tender leaves, flower and different parts of fruit, i.e., raw and ripe fruit epicarp, mesocarp and seed) of neem (Azadirachta indica), which occupies an important place in socio-cultural-religious life in Indian communities, indicate that neem is rich in pre-existing secondary metabolites (phenolic acids). Dry bark showed only tannic acid but in fresh bark three phenolic acids were observed, i.e., gallic, tannic, and ferulic acids. In tender leaves only gallic and ferulic acids were detected, but the levels of these phenolic acids in mature leaves were about three times and fifty times greater, respectively. Flowers had only two phenolic acids in which gallic acid was maximum followed by chlorogenic acid. The level of phenolic acid was maximum in seeds followed by epicarp and pulp. In raw and ripe fruit seeds four phenolic acids were detected. Raw fruit seeds were rich in phenolic acids than ripe fruit seeds. Fruit epicarp was relatively richer than seed, seed pulp and flowers of the plants. Neem flowers were also rich in gallic and chlorogenic acids.
Collapse
Affiliation(s)
- U P Singh
- Department of Mycology and Plant Pathology, Banaras Hindu University, Varanasi 221005, India.
| | | | | |
Collapse
|
34
|
Singh NV, Azmi S, Maurya S, Singh UP, Jha RN, Pandey VB. Two plant alkaloids isolated from Corydalis longipes as potential antifungal agents. Folia Microbiol (Praha) 2004; 48:605-9. [PMID: 14976716 DOI: 10.1007/bf02993466] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The alkaloids N-methylhydrasteine hydroxylactam and 1-methoxyberberine chloride were isolated from Corydalis longipes. Both alkaloids showed high efficacy individually (in concentration of 50-150 ppm) and also in a 1:1 mixture against spore germination of some fungi, viz. Alternaria alternata, A. brassicae, Curvularia maculans, Curvularia sp., Colletotrichum gloeosporioides, Colletotrichum sp., Helminthosporium speciferum, H. pennisetti, Helminthosporium sp., and Ustilago cynodontis. The antifungal effect of single compounds was dose-dependent. If the mutual ratio of the two components in the mixture was changed from 1:1 to a major content of any of the two compounds, the inhibitory effect on spore germination decreased.
Collapse
Affiliation(s)
- N V Singh
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221 005, India
| | | | | | | | | | | |
Collapse
|
35
|
Singh UP, Singh DP, Maurya S, Maheshwari R, Singh M, Dubey RS, Singh RB. Investigation on the phenolics of some spices having pharmacotherapeuthic properties. J Herb Pharmacother 2004; 4:27-42. [PMID: 15927923] [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] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Spices are an important group of agricultural commodities being used by many civilizations all over the world to aid flavor, taste and nutritional values in the food. In traditional medical systems, their ability to heal various physical, mental and emotional problems has widely been reported. With this view, HPLC analysis was performed to estimate phenolic acids in 21 spices (asafetida, Bishop's weed, black mustard, coriander, cinnamon, clove, curry leaf, cumin black, cumin, fennel, fenugreek, garlic, ginger, Indian cassia, Indian dill or dill large cardamom, onion, saffron, tamarind, true cardamom, yellow mustard) commonly used in India in different forms. In all, 7 phenolic acids; viz., tannic, gallic, caffeic, cinnamic, chlorogenic, ferulic and vanillic acids could be identified on the basis of their retention time with standard compounds and co-chromatography. Several parts of the spices, for instance, seeds, leaves, barks, rhizomes, latex, stigmas, floral buds and modified stems were used in the study. Maximum amount of tannic and gallic acids was observed in black mustard and clove. Caffeic, chlorogenic and ferulic acids were found maximum in cumin while vanillic and cinnamic acids in onion seeds. The spices are known to significantly contribute to the flavor, taste, and medicinal properties of food because of phenolics.
Collapse
Affiliation(s)
- U P Singh
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221005, India.
| | | | | | | | | | | | | |
Collapse
|
36
|
Maurya S, Bhot FB. Aerosol Antisepsis. Med J Armed Forces India 2003; 59:85. [PMID: 27407472 DOI: 10.1016/s0377-1237(03)80131-4] [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: 11/30/2022] Open
Affiliation(s)
- S Maurya
- Graded Specialist (Surgery), Military Hospital Yol Cantt, Kangra Valley - 176 052
| | - F B Bhot
- Classified Specialist (Anaesthesia), INHS Asvini, Colaba, Mumbai 400 005
| |
Collapse
|
37
|
Bhot FB, Maurya S. REGIONAL BLOCKS IN EXTREMITY TRAUMA. Med J Armed Forces India 2002; 58:283. [PMID: 27407406 DOI: 10.1016/s0377-1237(02)80166-6] [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: 10/18/2022] Open
Affiliation(s)
- F B Bhot
- Classified Specialist (Anaesthesiology), Military Hospital, Yol Cantt, Kangra, Himachal-176 052
| | - S Maurya
- Graded Specialist (Surgery), Military Hospital, Yol Cantt, Kangra, Himachal-176 052
| |
Collapse
|
38
|
Maurya S, Srivastava JS, Jha RN, Pandey VB, Singh UP. Efficacy of alkaloid (-)-corypalmine against spore germination of some fungi. Folia Microbiol (Praha) 2002; 47:287-90. [PMID: 12094740 DOI: 10.1007/bf02817654] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Inhibition activity of the alkaloid (-)-corypalmine on spore germination of plant pathogenic and saprophytic fungi (Alternaria solani, A brassicicola, A. brassicae, A. melongenae, Curvularia pallescens, C. lunata, C. maculans, Curvularisa sp., Colletotrichum sp., Helminthosporium speciferum, H. frumentacei, H. pennisetti, Heterosporium sp., Penicillum sp., Ustilago cynodontis) was determined. Spore germination of all the tested fungi was inhibited, Heterosporium sp. and Ustilago cynodontis being the most sensitive (complete inhibition of spore germination was observed at the very low concentration of 200 ppm). Curvularia palliscens, C. maculans and Curvularia sp. were less sensitive; complete inhibition of spore germination occurred at 400 ppm.
Collapse
Affiliation(s)
- S Maurya
- Department of Mycology and Plant Pathology, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi-221 005, India
| | | | | | | | | |
Collapse
|