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Balakrishnan A, Shankar R, Vijayakumar S. DFT approach on stability and conductance of nine different polyyne and cumulene molecules. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1601785] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kannan S, Shankar R, Kolandaivel P. Insights into structural and inhibitory mechanisms of low pH-induced conformational change of influenza HA2 protein: a computational approach. J Mol Model 2019; 25:99. [PMID: 30904969 DOI: 10.1007/s00894-019-3982-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 03/05/2019] [Indexed: 01/26/2023]
Abstract
Though oseltamivir and zanamivir are the active anti-influenza drugs, the emergence of different strains of influenza A virus with mutations creates drug-resistance to these drugs. Therefore, it is essential to find a suitable approach to stop the viral infection. The present study focuses on understanding the conformational changes of the HA2 protein at different pH levels (pH 7, pH 6, pH 5) and on blocking the low pH-induced conformational changes of the HA2 protein with a suitable ligand using molecular docking and molecular dynamics (MD) simulation methods. As the pH value decreases to pH 5, the protein undergoes large conformational changes with less stability in the order of pH 7 > pH 6 > pH 5. The fusion peptide (residues 1-20) and the extended loop (residues 58-75) deviate more at pH 5. The ligand stachyflin bound between the N- and C-terminal helix regions retains the stability of the HA2 protein at pH 5 and blocks the low pH-induced conformational transition. The performance of stachyflin is increased when it directly interacts with residues at the intramonomer binding site rather than the intermonomer binding site. The susceptibility of the HA2 protein of different subtypes to stachyflin is in the order of H1 > H7 > H5 > H2 > H3. Stachflin has a higher binding affinity for H1 (at pH 7, pH 6, pH 5) and H7 subtypes than others. Lys47, Lys58, and Glu103 are the key residues that favor the binding and highly stabilize the HA2 protein at low pH. Graphical abstract Low pH-induced conformational change of influenza HA2 protein.
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Vinnarasi S, Radhika R, Vijayakumar S, Shankar R. Structural insights into the anti-cancer activity of quercetin on G-tetrad, mixed G-tetrad, and G-quadruplex DNA using quantum chemical and molecular dynamics simulations. J Biomol Struct Dyn 2019; 38:317-339. [PMID: 30794082 DOI: 10.1080/07391102.2019.1574239] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Human telomerase referred as 'terminal transferase' is a nucleoprotein enzyme which inhibits the disintegration of telomere length and act as a drug target for the anticancer therapy. The tandem repeating structure of telomere sequence forms the guanine-rich quadruplex structures that stabilize stacked tetrads. In our present work, we have investigated the interaction of quercetin with DNA tetrads using DFT. Geometrical analysis revealed that the influence of quercetin drug induces the structural changes into the DNA tetrads. Among DNA tetrads, the quercetin stacked with GCGC tetrad has the highest interaction energy of -88.08 kcal/mol. The binding mode and the structural stability are verified by the absorption spectroscopy method. The longer wavelength was found at 380 nm and it exhibits bathochromic shift. The findings help us to understand the binding nature of quercetin drug with DNA tetrads and it also inhibits the telomerase activity. Further, the quercetin drug interacted with G-quadruplex DNA by using molecular dynamics (MD) simulation studies for 100 ns simulation at different temperatures and different pH levels (T = 298 K, 320 K and pH = 7.4, 5.4). The structural stability of the quercetin with G-quadruplex structure is confirmed by RMSD. For the acidic condition (pH = 5.4), the binding affinity is higher toward G-quadruplex DNA, this result resembles that the quercetin drug is well interacted with G-quadruplex DNA at acidic condition (pH = 7.4) than the neutral condition. The obtained results show that quercetin drug stabilizes the G-quadruplex DNA, which regulates telomerase enzyme and it potentially acts as a novel anti-cancer agent.Communicated by Ramaswamy H. Sarma.
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Pitchumani Violet Mary C, Shankar R, Vijayakumar S. Theoretical insights into the metal chelating and antimicrobial properties of the chalcone based Schiff bases. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2019.1573370] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Balakrishnan A, Shankar R, Vijayakumar S. Reduced bond length alternation and helical molecular orbitals in donor and acceptor substituted linear carbon chains. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1142/s0219633618500499] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Increasing chain length and end group substitution of polyynes play a crucial role in molecular electronics and nanomaterials. The studies on linear carbon chains are lesser when compared to other carbon allotropes like graphene, fullerenes, nanotube, etc. This prompted us to study the linear carbon chains of different lengths and substitutions. The electronic and optical properties of X–C[Formula: see text]–X ([Formula: see text]–15 and [Formula: see text], NH2, CN, OH) molecules have been studied by using CAM-B3LYP/6-31G* level of theory of DFT methods. Linear carbon chains with odd values of n show lower bond length alternation (BLA) values similar to that of cumulenes and may have metallic property, but the substitution of donor/acceptor molecules does not decrease the BLA significantly. Molecular orbital analysis of linear carbon chains shows that NH2 or NO2 substituted polyynes have helical molecular orbitals for smaller chain lengths which may make a good candidate for molecular wires in molecular devices. As the chain length increases, the helicity decreases and finally disappears. Also, it is seen that for smaller odd values of [Formula: see text] for donor, substituted polyynes have a singlet ground, whereas all the odd [Formula: see text] values of acceptor substitution have triplet ground state.
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Saranya V, Shankar R, Vijayakumar S. Structural exploration of viral matrix protein 40 interaction with the transition metal ions (Ag+ and Cu2+). J Biomol Struct Dyn 2018; 37:2875-2896. [DOI: 10.1080/07391102.2018.1498803] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Gopalakrishnan S, Vijayakumar S, Shankar R. DFT/TD-DFT study on halogen doping and solvent contributions to the structural and optoelectronic properties of poly[3,6-carbazole] and poly[indolo(3,2-b)-carbazole]. Struct Chem 2018. [DOI: 10.1007/s11224-018-1156-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sharma N, Kushwaha M, Arora D, Jain S, Singamaneni V, Sharma S, Shankar R, Bhushan S, Gupta P, Jaglan S. New cytochalasin from Rosellinia sanctae-cruciana, an endophytic fungus of Albizia lebbeck. J Appl Microbiol 2018; 125:111-120. [PMID: 29573314 DOI: 10.1111/jam.13764] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 12/26/2017] [Accepted: 03/12/2018] [Indexed: 01/18/2023]
Abstract
AIM To explore the potential of Rosellinia sanctae-cruciana an endophytic fungus associated with Albizia lebbeck for pharmaceutically important cytotoxic compounds. METHODS AND RESULTS One novel cytochalasin, named jammosporin A (1) and four known analogues (2-5) were isolated from the culture of the endophytic fungus R. sanctae-cruciana, harboured from the leaves of the medicinal plant A. lebbeck. Their structures were elucidated by extensive spectroscopic analyses including one-dimensional and two-dimensional nuclear magnetic resonance data along with MS data and by comparison with literature reports. In preliminary screening the ethyl acetate extract of the fungal culture was tested for cytotoxic activity against a panel of four cancer cell lines (MOLT-4, A549, MIA PaCa-2 and MDA-MB-231), and found to be active against MOLT-4 with an IC50 value of 10 μg ml-1 . Owing to the remarkable cytotoxic activity of the extract the isolated compounds (1-5) were evaluated for their cytototoxicity against the MOLT-4 cell line by MTT assay. Interestingly, compounds 1-2, 4 and 5 showed considerable cytotoxic potential against the human leukaemia cancer cell line (MOLT-4) with IC50 values of 20·0, 10·0, 8·0 and 6·0 μmol l-1 , respectively, while compound 3 showed an IC50 value of 25 μmol l-1 . This is the first report of the existence of this class of secondary metabolites in R. sanctae-cruciana fungus. CONCLUSION This study discovered a novel compound, named jammosporin A, isolated for the first time from R. sanctae-cruciana, an endophytic fungus of A. lebbeck with anticancer activity against the MOLT-4 cell line. SIGNIFICANCE AND IMPACT OF THE STUDY Rosellinia sanctae-cruciana represents an interesting source of a new compound with bioactive potential as a therapeutic agent against a human leukaemia cancer cell line (MOLT-4).
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Shankar R, Henley W, Boland C, Laugharne R, McLean BN, Newman C, Hanna J, Ashby S, Walker MC, Sander JW. Decreasing the risk of sudden unexpected death in epilepsy: structured communication of risk factors for premature mortality in people with epilepsy. Eur J Neurol 2018; 25:1121-1127. [PMID: 29611888 DOI: 10.1111/ene.13651] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/27/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND PURPOSE Good practice guidelines highlight the importance of making people with epilepsy aware of the risk of premature mortality in epilepsy particularly due to sudden unexpected death in epilepsy (SUDEP). The SUDEP and Seizure Safety Checklist ('Checklist') is a structured risk communication tool used in UK clinics. It is not known if sharing structured information on risk factors allows individuals to reduce SUDEP and premature mortality risks. The aim of this study was to ascertain if the introduction of the Checklist in epilepsy clinics led to individual risk reduction. METHODS The Checklist was administered to 130 consecutive people with epilepsy attending a specialized epilepsy neurology clinic and 129 attending an epilepsy intellectual disability (ID) clinic within a 4-month period. At baseline, no attendees at the neurology clinic had received formal risk advice, whereas all those attending the ID clinic had received formal risk advice on multiple occasions for 6 years. The Checklist was readministered 1 year later to each group and scores were compared with baseline and between groups. RESULTS Of 12 risk factors considered, there was an overall reduction in mean risk score for the general (P = 0.0049) but not for the ID (P = 0.322) population. Subanalysis of the 25% of people at most risk in both populations showed that both sets had a significant reduction in risk scores (P < 0.001). CONCLUSION Structured discussion results in behavioural change that reduces individual risk factors. This impact seems to be higher in those who are at current higher risk. It is important that clinicians share risk information with individuals as a matter of public health and health promotion.
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Lohaus T, Herkenhoff N, Shankar R, Wessling M. Feed flow patterns of combined Rayleigh-Bénard convection and membrane permeation. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.11.061] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mishra A, Negi BDS, Banerjee A, Nainwal HC, Shankar R. Estimation of Ice Thickness of the Satopanth Glacier, Central Himalaya Using Ground Penetrating Radar. CURR SCI INDIA 2018. [DOI: 10.18520/cs/v114/i04/785-791] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Madhubabu M, Shankar R, Krishna T, Kumar YS, Chiranjeevi Y, Muralikrishna C, Mohan HR, More SS, Rao MB, Akula R. A convergent approach towards the synthesis of the 2-alkyl-substituted tetrahydroquinoline alkaloid (−)-cuspareine. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.10.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Anithaa VS, Vijayakumar S, Sudha M, Shankar R. Theoretical investigation on hydrogen bond interaction of diketo/keto-enol form uracil and thymine tautomers with intercalators. J Mol Model 2017; 23:333. [DOI: 10.1007/s00894-017-3476-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 09/18/2017] [Indexed: 10/18/2022]
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Mary CPV, Vijayakumar S, Shankar R. Metal chelating ability and antioxidant properties of Curcumin-metal complexes - A DFT approach. J Mol Graph Model 2017; 79:1-14. [PMID: 29127853 DOI: 10.1016/j.jmgm.2017.10.022] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 10/13/2017] [Accepted: 10/31/2017] [Indexed: 12/20/2022]
Abstract
Curcumin, a well-documented phytochemical compound used to treat various diseases because of its more tolerability in the human body and has no side effects. The present study describes the metal chelating ability of Curcumin for Mn2+, Fe2+ and Zn2+ metal ions and their antioxidant properties using density functional theory in both gas and DMSO solvent phases. Results reveal that the carbonyl group at diketo moiety is destabilized due to the metal ion coordination. The interaction energies reveal that CurEN-Zn2+ are the most stable rather than the CurEN-Mn2+ and CurEN-Fe2+ complexes. The AIM analysis confirms that the interaction between the metal ions and Curcumin are to be electrostatic dominant. The HOMO-LUMO orbital analysis shows that the charge transfer interaction is dominant for CurEN-Mn2+ and CurEN-Fe2+ complexes. The DMSO solvent interactions decrease the stability of the CurEN-M2+ cation complexes. The antioxidant mechanism is more reactive for metal complexes than the isolated Curcumin. Since Curcumin possess both metal chelating and antioxidant properties, it can be used in chelation therapy for the cure of Alzheimer's disease.
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Kaur T, Krishnaprasad S, Shankar R, Kumar R, Gowrishankar S, Padua MD. Plasma Cell Infiltration of the Kidney as a Manifestation of Myeloma: A Report of Three Cases. Indian J Nephrol 2017; 27:395-398. [PMID: 28904438 PMCID: PMC5590419 DOI: 10.4103/ijn.ijn_215_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Infiltration of renal parenchyma by neoplastic plasma cells in myeloma patients is an unusual finding. We report 3 cases of myeloma, with renal biopsy being the first clue to the diagnosis in one. The plasma cell infiltrate in other two cases was not so evident but immunofluorescence (IF) and immunohistochemical (IHC) stains for light chains helped establish the monoclonal nature of the infiltrate. We surmise that plasma cell infiltration in the kidney can be an important clue to the diagnosis of an underlying myeloma and could in future be regarded as a myeloma-defining event (MDE) if monoclonality is confirmed. This finding could directly affect the prognosis and be a direct indicator of the tumor burden. Further studies are however required to determine the exact prognostic value and precise relationship of such a finding with deranged renal functions in myeloma.
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Ritchie-McLean S, Shankar R. Calculating oxygen consumption during low-flow anaesthesia. Anaesthesia 2017; 72:789. [PMID: 28654164 DOI: 10.1111/anae.13899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Radhika R, Shankar R, Vijayakumar S, Kolandaivel P. Role of 6-Mercaptopurine in the potential therapeutic targets DNA base pairs and G-quadruplex DNA: insights from quantum chemical and molecular dynamics simulations. J Biomol Struct Dyn 2017; 36:1369-1401. [PMID: 28436311 DOI: 10.1080/07391102.2017.1323013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The theoretical studies on DNA with the anticancer drug 6-Mercaptopurine (6-MP) are investigated using theoretical methods to shed light on drug designing. Among the DNA base pairs considered, 6-MP is stacked with GC with the highest interaction energy of -46.19 kcal/mol. Structural parameters revealed that structure of the DNA base pairs is deviated from the planarity of the equilibrium position due to the formation of hydrogen bonds and stacking interactions with 6-MP. These deviations are verified through the systematic comparison between X-H bond contraction and elongation and the associated blue shift and red shift values by both NBO analysis and vibrational analysis. Bent's rule is verified for the C-H bond contraction in the 6-MP interacted base pairs. The AIM results disclose that the higher values of electron density (ρ) and Laplacian of electron density (∇2ρ) indicate the increased overlap between the orbitals that represent the strong interaction and positive values of the total electron density show the closed-shell interaction. The relative sensitivity of the chemical shift values for the DNA base pairs with 6-MP is investigated to confirm the hydrogen bond strength. Molecular dynamics simulation studies of G-quadruplex DNA d(TGGGGT)4 with 6-MP revealed that the incorporation of 6-MP appears to cause local distortions and destabilize the G-quadruplex DNA.
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Shankar R, Ram S. An evidenced based checklist to support anti-dementia medication withdrawal in people with down syndrome (DS), intellectual disability (Id) and dementia. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
DS with aging is associated with greatly increased risk of developing dementia similar to Alzheimer's. Anti-dementia drug discontinuation is recommended when clinical benefit is not determined. In DS it is more complex as medication ill effects of stopping needs to be weighed in balance to extraneous processes such as environment changes, sensory impediments and physical ill health and natural progression of dementia.AimCan identified risk factors extracted from a comprehensive literature review be developed into an evidence based check list to support risk minimized person centered withdrawal of anti-dementia drugs when considered not to be efficacious in DS?MethodA detailed literature review using Medline, PsychInfo, Cinahl and Embase with relevant search terms in various permutations and combinations without any date limit enquiring current evidence base on anti-dementia medication withdrawal was conducted. The review also looked to extract the common risk factors in stopping medication. All risk factors were collated, reviewed by a focus group of experts, developed into a checklist.ResultsThirty abstracts were obtained following the search. Six papers were short-listed. No papers identified a structured approach to medication reduction. An 18-factor checklist was applied prospectively to 30 cases. The checklist was sensitive to identify change to guide clinical decision-making.ConclusionsCurrently, decision to peg medication withdrawal risk is arbitrary and clinical in dementia especially in DS dementia. The evidenced based developed checklist is useful to support and structure clinical decisions. It helps clinicians and patients to focus on promoting safety, reduce harm and guide treatment.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Shankar R, Wilkinson E, Roberts S, Rebecca O. Zero suicide southwest UK initiative – Steps to mitigate suicide risk in local populations using quality improvement methodology and a whole life approach. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.02.473] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
BackgroundOnly 25% of people who die by suicide see mental health services. Suicide is not just a health issue. Its causation and consequences lie within all of society. Many erroneously believe that suicide is inevitable and not preventable, because its causation is too complex. Underlying associations with suicide are largely social. There are programmes in the USA, which have combined interventions to reduce suicides. The 2014 UK suicide rate per 100,000 was 10.8 but 11.1 in South West (SW) England (pop: 5 million). A whole system approach is necessary. Zero Suicides SW is a project to address this.Aim(1) To develop a regional strategy to reduce and prevent suicide. (2) To make whole populations suicide risk aware. (3) Reduce regional suicide rates.MethodA collaborative involving national and local 60 organisations including charities and voluntary sector was formed. Five collaborative meetings used narratives of suicide survivors, national experts led themed workshops, etc. to come up with a regional strategy. Quality Improvement (QI) Methodology was used to develop and examine the success of all projects.OutputsInitiatives such as using local radio stations for mental health promotion, collaboration via a poster campaign with local breweries and pubs to make men more self-aware of risk, suicide risk counselling for relatives/carers of patients admitted to psychiatric care, improving scrutiny to access to medication for recently discharged psychiatric patients have developed from the project. The QI model demonstrated how localised changes at person and organisation level could combine and have a powerful role in suicide prevention.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Shankar R, Quick C, Dawson J, Annal P. A Simple Composite Dynamic Digital Tool to Communicate Complex Physical and Mental Health needs and Measure Outcomes: The Cornwall Health Radar. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
IntroductionClinician-patient communication is a major factor in influencing outcomes of healthcare. Complexity increases if an individual has multiple health needs requiring support of different clinicians or agencies.AimTo develop and evidence a simple dynamic computerised tool to capture and communicate outcomes of intervention or alteration in clinical need in patients with multiple chronic health needs.MethodA MS Excel algorithm was designed for swift capture of clinical information discussed in an appointment using pre-designed set of evidenced based domains. An instant personalized single screen visual is produced to facilitate information sharing and decision-making. The display is responsive to compare changes across time. A prototype was conceptually tested in an epilepsy clinic for people with Intellectual disability (ID) due to the unique challenges posed in this population.ResultsEvidence across 300 patients with ID and epilepsy showed the tool works by enhancing reflective communication, compliance and therapeutic relationship. Medication and appointment compliance was 95% and patient satisfaction over 90%.ConclusionTo discuss all influencing health factors in a consultation is a communication challenge esp. if the patient has multiple health needs. A picture equals 1000 words and helps address the cognitive complexity of verbal information. The radar offers an evidenced based common framework to host care plans of different health conditions. It provides individualised easy view person centred care plans to allow patients to gain insight on how the different conditions impact on their overall well being and be active participants. The tool will be practically demonstrated.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Anithaa VS, Shankar R, Vijayakumar S. Adsorption of Mn atom on pristine and defected graphene: a density functional theory study. J Mol Model 2017; 23:132. [DOI: 10.1007/s00894-017-3300-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 02/27/2017] [Indexed: 01/29/2023]
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R.W. Beck, Laugharne J, Laugharne R, Woldman W, McLean B, Mastropasqua C, Jorge R, Shankar R. Abnormal cortical asymmetry as a target for neuromodulation in neuropsychiatric disorders: A conceptual proposal. Brain Stimul 2017. [DOI: 10.1016/j.brs.2017.01.300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Elakiya C, Shankar R, Vijayakumar S, Kolandaivel P. A theoretical study on the reaction mechanism and kinetics of allyl alcohol (CH2 = CHCH2OH) with ozone (O3) in the atmosphere. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1292012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Pitchumani Violet Mary C, Shankar R, Vijayakumar S. Theoretical studies on the interaction between the nitrile-based inhibitors and the catalytic triad of Cathepsin K. J Biomol Struct Dyn 2017; 36:634-655. [PMID: 28150528 DOI: 10.1080/07391102.2017.1289863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Computational studies on the interaction of novel inhibitor compounds with the Cathepsin K protease have been performed to study the inhibition properties of the inhibitor compounds. The quantum chemical calculations have been performed to analyze the molecular geometries, structural stability, reactivity, nature of interaction, and the charge transfer properties using B3LYP level of theory by implementing 6-311g(d,p) basis set. The calculated C-S and N-H…N bond lengths of the inhibitor-triad complexes are found to agree well with the previous literature results. The chemical reactivity of the inhibitors and catalytic triad are analyzed through frontier molecular orbital analysis and found that the inhibitors are subjected to nucleophilic attack by the catalytic triad. The nature of inhibition of the inhibitor compounds is examined using the quantum theory of Atoms in Molecules analysis and found to be partially covalent. The NBO stabilization energy for the Cys - inhibitor are found to be most stable than the other interactions. The molecular dynamic simulations were performed to study the influence of dynamic of the active site on the QM results. The many body decomposition interaction energy calculated for the final results of MD simulation reveals that the dynamic of the active site induces significant changes in the interaction energy and occupancy of H-bonds plays a major role in the stabilizing the active site inhibitor interactions. The present study reveals that the inhibitor compounds can inhibit the proteolytic activity of the proteases on binding with the catalytic active site.
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Naveen P, Jain R, Kalaivani P, Shankar R, Dallemer F, Prabhakaran R. Unpredicted formation of copper(ii) complexes containing 2-thiophen-2-yl-1-thiophen-2-ylmethyl-1H-benzoimidazole and their most promising in vitro cytotoxicity in MCF-7 and HeLa cell lines over cisplatin. NEW J CHEM 2017. [DOI: 10.1039/c7nj01273j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
An in situ reaction of CuCl2·2H2O, o-phenylenediamine, thiophene-2-carbaldehyde and sodium azide in methanol afforded complex 1a.
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