51
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Chandy S, Ramanathan K, Manoharan A, Mathai D, Baruah K. Assessing effect of climate on the incidence of dengue in Tamil Nadu. Indian J Med Microbiol 2014; 31:283-6. [PMID: 23883717 DOI: 10.4103/0255-0857.115640] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Incidence of dengue is reported to be influenced by climatic factors. The objective of this study is to assess the association of local climate with dengue incidence, in two geographically distinct districts in Tamil Nadu. The study uses climate data, rainfall and mean maximum and minimum temperature to assess its association if any, with dengue incidence in two districts of Tamil Nadu, South India. According to this study while precipitation levels have an effect on dengue incidence in Tamil Nadu, non-climatic factors such as presence of breeding sites, vector control and surveillance are important issues that need to be addressed.
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Ahmadi A, Leipsic J, Taylor C, Rezazadeh S, Grunau G, Heilbron B, Ramanathan K. Do Statins Have the Same Effect on Coronary Plaques in South Asians Compared to Non South Asians? A Coronary Computed Tomography Study. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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53
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Chan S, Wong G, Chou A, Alipour S, Mckinney J, Starovoytov A, Skutezky T, Wong A, Ketheeswaranathan G, Largy W, Taylor C, Ramanathan K. Diagnostic Value of Lead AVR From 12-Lead Electrocardiogram in Predicting Culprit Lesions in Anterior and Inferior St-Elevation Myocardial Infarction. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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54
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Starovoytov A, Verma A, Taylor C, Sharifi S, MacGillivray J, Sidsworth M, Hope J, Fox R, Gin K, Ramanathan K. Relationship Between Socioeconomic Factors and Quality of Anticoagulation. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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55
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Bainey K, Grima D, Brown S, Kamboj L, Goeree R, Oh P, Ramanathan K, Goodman S. Economic Evaluation of Ticagrelor Versus Clopidogrel in Canadian Patients With Acute Coronary Syndromes Based on the Platelet Inhibition and Patient Outcomes (Plato) Trial. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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56
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Chandrasekaran P, Doss CGP, Nisha J, Sethumadhavan R, Shanthi V, Ramanathan K, Rajasekaran R. In silico analysis of detrimental mutations in ADD domain of chromatin remodeling protein ATRX that cause ATR-X syndrome: X-linked disorder. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s13721-013-0031-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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57
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Karthick V, Shanthi V, Rajasekaran R, Ramanathan K. In silico analysis of drug-resistant mutant of neuraminidase (N294S) against oseltamivir. PROTOPLASMA 2013; 250:197-207. [PMID: 22392098 DOI: 10.1007/s00709-012-0394-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 02/22/2012] [Indexed: 05/31/2023]
Abstract
The recent H1N1 influenza pandemic has attracted worldwide attention due to the high infection rate. Oseltamivir is a new class of anti-viral agent approved for the treatment and prevention of influenza infections. The principal target for this drug is a virus surface glycoprotein, neuraminidase (NA), which facilitates the release of nascent virus and thus spreads infection. Until recently, only a low prevalence of neuraminidase inhibitor (NAI) resistance (<1 %) had been detected in circulating viruses. However, there have been reports of significant numbers of A (H1N1) influenza strains with a N294S neuraminidase mutation that was highly resistant to the NAI, oseltamivir. Hence, in the present study, we highlight the effect of point mutation-induced oseltamivir resistance in H1N1 subtype neuraminidases by molecular simulation approach. The docking analysis reveals that mutation (N294S) significantly affects the binding affinity of oseltamivir with mutant type NA. This is mainly due to the decrease in the flexibility of binding site residues and the difference in prevalence of hydrogen bonds in the wild and mutant structures. This study throws light on the possible effects of drug-resistant mutations on the large functionally important collective motions in biological systems.
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58
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Balasubramanian M, Ramanathan K, kumar VS. Mathematical Modeling and Finite Element Analysis of Superplastic Forming of Ti-6Al-4V Alloy in a Stepped Rectangular Die. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.proeng.2013.09.200] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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59
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Sreevishnupriya K, Chandrasekaran P, Senthilkumar A, Sethumadhavan R, Shanthi V, Daisy P, Nisha J, Ramanathan K, Rajasekaran R. Computational analysis of deleterious missense mutations in aspartoacylase that cause Canavan's disease. SCIENCE CHINA-LIFE SCIENCES 2012; 55:1109-19. [PMID: 23233226 DOI: 10.1007/s11427-012-4406-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 11/06/2012] [Indexed: 01/09/2023]
Abstract
In this work, the most detrimental missense mutations of aspartoacylase that cause Canavan's disease were identified computationally and the substrate binding efficiencies of those missense mutations were analyzed. Out of 30 missense mutations, I-Mutant 2.0, SIFT and PolyPhen programs identified 22 variants that were less stable, deleterious and damaging respectively. Subsequently, modeling of these 22 variants was performed to understand the change in their conformations with respect to the native aspartoacylase by computing their root mean squared deviation (RMSD). Furthermore, the native protein and the 22 mutants were docked with the substrate NAA (N-Acetyl-Aspartic acid) to explain the substrate binding efficiencies of those detrimental missense mutations. Among the 22 mutants, the docking studies identified that 15 mutants caused lower binding affinity for NAA than the native protein. Finally, normal mode analysis determined that the loss of binding affinity of these 15 mutants was caused by altered flexibility in the amino acids that bind to NAA compared with the native protein. Thus, the present study showed that the majority of the substrate-binding amino acids in those 15 mutants displayed loss of flexibility, which could be the theoretical explanation of decreased binding affinity between the mutant aspartoacylases and NAA.
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60
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Chou A, Ramanathan K, Gao M, Chan S, Aymong E, Saw J, Imrie J, Orenstein T, Wong G. 118 ECGS Pre and Early Post Primary PCI : Important Predictor of In-Hospital Adverse Outcomes in STEMI Population. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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61
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Saber SS, Alipour S, Starovoytov A, MacGillivray J, Ramanathan K. 067 Quality of Anticoagulation in Community Practices of British Columbia. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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62
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Ramanathan K, Ioannou K, Keshmiri H, Starovoytov A, Elliott T, Taylor C, Fox R, Farkouh M. 326 Disparity Between Clinical Trials and Registry Outcomes: Reflections From the Bypass Angioplasty Revascularization Investigation 2 Diabetes (BARI-2D) Trial. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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63
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Tsang M, Taylor C, Stadnick E, Rajala J, Ong K, Wong G, Dorscheid D, Ramanathan K. 318 The Current Practice of Blood Transfusion in the Coronary Care Units: A Registry Study. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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64
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Ahmadi A, Alipour S, Rezazadeh S, Grunau G, Heilbron B, Taylor C, Leipsic J, Ramanathan K. 674 Can Coronary Computed Tomography Angiography Enhance Our Understanding of Coronary Artery Disease in the South Asian Population? Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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65
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Mangat B, Taylor C, Wong G, Vyselaar J, Perry M, Vandergriend R, Ignaszewski A, Ramanathan K. 202 Cardiac Rehabilitation Improves Metabolic Parameters Post-ST Elevation Myocardial Infarction (STEMI) Across Multiple Ethnic Groups. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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66
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Karthick V, Shanthi V, Rajasekaran R, Ramanathan K. Exploring the Cause of Oseltamivir Resistance Against Mutant H274Y Neuraminidase by Molecular Simulation Approach. Appl Biochem Biotechnol 2012; 167:237-49. [DOI: 10.1007/s12010-012-9687-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 04/10/2012] [Indexed: 11/29/2022]
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67
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Boone R, Ramanathan K, Hague C, Heilbron B, Taylor C, Wijesinghe N, Leipsic J. 215 Coronary artery luminal area in south asians and non-south asians: A coronary ct angiographic assessment. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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68
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Ahmadi A, Graunu G, Alipour S, Rezazadeh S, Faraji R, Amid S, Heilbron B, Ramanathan K, Taylor C, Leipsic J. 574 Assessing the predictive value of traditional cardiac risk factors and various framingham risk estimates for coronary artery disease severity and their impact in directing patients' clinical management: a coronary computed tomography angiography (CCTA) study. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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69
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Brunner N, Wang H, Ramanathan K, Khan N. 314 Mortality amongst South Asian, Chinese and White patients with diabetes prescribed statin therapy. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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70
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Alipour S, Chandy M, Ahmadi A, Grunau G, Taylor C, Heilbron B, Leipsic J, Ramanathan K. 014 An assessment of sex differences in coronary artery plaque burden and morphology in South Asians using coronary computed tomography angiography. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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71
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Fordyce C, Ramanathan K, Pu A, Imrie J, Orenstein T, Perry M, Wanger K, Gao M, Carere R, Wong G. 230 Impact of pre-hospital electrocardiograms and mode of patient presentation on in-hospital mortality in a regional model of ST-elevation myocardial infarction care. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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72
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Mangat B, Talyor C, Wong G, Chan S, McLeod K, Isserow S, Ignaszewski A, Ramanathan K. 136 Ethnic disparities in cardiac rehabilitation attendance post-st elevation myocardial infarction (STEMI). Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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73
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Brunner N, Scheuermeyer F, Grafstein E, Ramanathan K. 228 Prognosis of patients discharged from the emergency department with a positive troponin: A retrospective cohort study. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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74
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Ramanathan K, Shanthi V, Sethumadhavan R. A compact review on the comparison of conventional and non-conventional interactions on the structural stability of therapeutic proteins. Interdiscip Sci 2011; 3:144-60. [PMID: 21541844 DOI: 10.1007/s12539-011-0082-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 06/21/2010] [Accepted: 06/24/2010] [Indexed: 11/28/2022]
Abstract
Therapeutic proteins carry out the most difficult tasks in living cells. They do so by interacting specifically with other molecules. This requires that they fold to a unique and more stable conformation. A prerequisite for comprehending the folding processes in their immense complexity entails a thorough understanding of many weak interactions. The purpose of this review is to systematically study the role of weak interactions such as cation-π, C-H......π, N-H......π and O-H......π, in the set of 49 therapeutic proteins. The importance of many of these interactions (for example, cationic residues interacting with π system) is revealed by the higher degree of conservation observed for them in protein structures. These interactions are mainly formed by long-range contacts and significant percentage of cation-π, C-H......π, N-H......π and O-H......π interacting residues had one or more stabilization centers. Further, a comparison of conventional and nonconventional interactions in the present data set unambiguously highlights the significance of these weak interactions in the structural stability of therapeutic proteins. We propose that the incorporation of the entirety of these interactions leads to a more complete description of the problem, and that this could provide new perspectives and new possible answers.
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Niles DW, Ramanathan K, Granata J, Hasoon F, Noufi R, Tielsch BJ, Fulghum JE. Na Impurity Chemistry in Photovoltaic Cigs thin-Films: An Investigation with Photo- and Auger Electron Spectroscopies. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-485-179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractThe incorporation of Na into Cu(Inl-xGax)Se2 thin-films is known to lead to an improvement in device performance. The authors use X-ray photoelectron and Auger electron spectroscopies to determine the chemical nature of Na in Cu(Inl-xGax)Se2 thin-films. The Na concentration is determined to be ∼ 0.1 atomic percent in the bulk of Cu(In1-xGax)Se2 thin-films. The Na is chemically bonded to Se. The authors propose a model invoking the replacement of column III elements by Na during the growth of Cu(Inl-xGax)Se2 thin-films. These Nain and NaGa defects act as acceptor states to increase the p-type conductivity of Cu(In1-xGax)Se2 thin-films.
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