1
|
Kumaran S, Vetrivelan V, Muthu S, Al-Saadi AA. Computational analysis of anti-cancer drug hydroxyurea adsorption on nanocages of gold, silver and copper: SERS and DFT assessment. Heliyon 2024; 10:e24475. [PMID: 38444468 PMCID: PMC10912048 DOI: 10.1016/j.heliyon.2024.e24475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/07/2024] [Accepted: 01/09/2024] [Indexed: 03/07/2024] Open
Abstract
The use of nanostructures in targeted drug delivery is effective in decreasing anticancer drug toxicity. Here, we discuss the theoretically predicted adsorption and interaction behavior of hydroxyurea [HU] with nano metal cages (nmC). HU interact the nmC through the N4 in primary amine with energies of -29.776, -30.684 and -22.105 kcal/mol for Au, Ag and Cu cage, respectively. As a result of reactivity studies, HU complexes with nmC (Au/Ag/Cu) are becoming more electrophilic and this gives the nmC system their bioactivity. It is suggested that nanocage is going to change the FMO's energy levels by means of absorption, so that it is used in drug administration. DOS and MEP were accomplished to gain additional understandings into the reactivity of proposed complexes. Method for improving the Raman signal of biomolecules is surface enhanced Raman scattering (SERS), which uses nanosized metal substrates. Chemical enhancement is evidenced by Mulliken charge distributions of all systems for detection and chemical compositions and exerts a significant role in determining them. In HU complexes containing nmC (Au/Ag/Cu), electron density was detected via ELF and LOL calculations. Based on the results of a non-covalent interaction (NCI) analysis, Van der Waals/hydrogen bonds/repulsive steric - interactions have been found. The title compound will also be analyzed in order to determine its bioactivity and drug likeness parameters, as a result, we will able to create a molecule with a highly favorable pharmacological profile and use the docking method to determine the values of the interaction energies for drug delivery. This study suggests that adsorption of drugs on nanocage surface occurs physically and functionalizing the nanocage has increased adsorption energy.
Collapse
Affiliation(s)
- S. Kumaran
- Department of ECE, Saveetha Engineering College, Thandalam, Chennai, 602105, Tamilnadu, India
| | - V. Vetrivelan
- Department of Physics, Government College of Engineering, Srirangam, Tiruchirappalli, 620012, Tamilnadu, India
| | - S. Muthu
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, 604 407, Tamilnadu, India
| | - Abdulaziz A. Al-Saadi
- Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran, 3126, Saudi Arabia
- Interdisciplinary Research Center for Refining and Advanced Chemicals, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
| |
Collapse
|
2
|
Das A, Mandal R, Ravi Sankar HS, Kumaran S, Premkumar JR, Borah D, Sundararaju B. Reversal of Regioselectivity in Asymmetric C-H Bond Annulation with Bromoalkynes under Cobalt Catalysis. Angew Chem Int Ed Engl 2024; 63:e202315005. [PMID: 38095350 DOI: 10.1002/anie.202315005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Indexed: 12/30/2023]
Abstract
Metal-catalyzed asymmetric C-H bond annulation strategy offers a versatile platform, allowing the construction of complex P-chiral molecules through atom- and step-economical fashion. However, regioselective insertion of π-coupling partner between M-C bond with high enantio-induction remain elusive. Using commercially available Co(II) salt and chiral-Salox ligands, we demonstrate an unusual protocol for the regio-reversal, enantioselective C-H bond annulation of phosphinamide with bromoalkyne through desymmetrization. The reaction proceeds through ligand-assisted enantiodetermining cyclocobaltation followed by regioselective insertion of bromoalkyne between Co-C, subsequent reductive elimination, and halogen exchange with carboxylate resulted in P-stereogenic compounds in excellent ee (up to >99 %). The isolation of cobaltacycle involved in the catalytic cycle and the outcome of control experiments provide support for a plausible mechanism.
Collapse
Affiliation(s)
- Abir Das
- Department of Chemistry, Indian Institution of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
| | - Rajib Mandal
- Department of Chemistry, Indian Institution of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
| | | | - Subramani Kumaran
- Department of Chemistry, Indian Institution of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
| | - J Richard Premkumar
- PG & Research Department of Chemistry, Bishop Heber College, 620017, Tiruchirappalli, Tamil Nadu, India
| | - Dipanti Borah
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, 400076, Mumbai, Maharashtra, India
| | - Basker Sundararaju
- Department of Chemistry, Indian Institution of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
| |
Collapse
|
3
|
R R, Thakur P, Kumar N, Saini N, Banerjee S, Singh RP, Patel M, Kumaran S. Multi-oligomeric and catalytically compromised serine acetyltransferase and cysteine regulatory complex of Mycobacterium tuberculosis. Biochimie 2024; 221:110-124. [PMID: 38311199 DOI: 10.1016/j.biochi.2024.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 01/12/2024] [Accepted: 01/17/2024] [Indexed: 02/10/2024]
Abstract
l-cysteine, a primary building block of mycothiol, plays an essential role in the defense mechanism of Mycobacterium tuberculosis (Mtb). However, it is unclear how Mtb regulates cysteine biosynthesis as no study has reported the cysteine regulatory complex (CRC) in Mtb. Serine acetyltransferase (SAT) and cysteine synthase (CS) interact to form CRC. Although MtCS has been characterized well, minimal information is available on MtSAT, which synthesizes, O-acetylserine (OAS), the precursor of cysteine. This study fills the gap and provides experimental evidence for the presence of MtCRC and a non-canonical multi-oligomeric MtSAT. We employed multiple analytical methods to characterize the oligomeric and kinetic properties of MtSAT and MtCRC. Results show that MtSAT, lacking >75 N-terminal amino acids exists in three different assembly states; trimer, hexamer, and dodecamer, compared to the single hexameric state of SAT of other bacteria. While hexamers display the highest catalytic turnover, the trimer is the least active. The predominance of trimers at low physiologically relevant concentrations suggests that MtSAT displays the lowest catalytic potential known. Further, the catalytic potential of MtSAT is also significantly reduced in CRC state, in contrast to enhanced activity of SAT in CRC of other organisms. Our study provides insights into multi-oligomeric MtSAT with reduced catalytic potential and demonstrates that both MtSAT and MtCS of Mycobacterium interact to form CRC, although with altered catalytic properties. We discuss our results in light of the altered biochemistry of the last step of canonical sulfate-dependent cysteine biosynthesis of Mycobacterium.
Collapse
Affiliation(s)
- Rahisuddin R
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Payal Thakur
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Narender Kumar
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Neha Saini
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Shrijta Banerjee
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Ravi Pratap Singh
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - Madhuri Patel
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India
| | - S Kumaran
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, 160036, India.
| |
Collapse
|
4
|
Kumar A, Boradia VM, Mahajan A, Kumaran S, Raje M, Raje CI. Mycobacterium tuberculosis H37Rv enolase (Rv1023)- expression, characterization and effect of host dependent modifications on protein functionality. Biochimie 2023; 214:102-113. [PMID: 37385399 DOI: 10.1016/j.biochi.2023.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 06/21/2023] [Accepted: 06/27/2023] [Indexed: 07/01/2023]
Abstract
Mycobacterium tuberculosis enolase is an essential glycolytic enzyme that catalyzes the conversion of 2, phosphoglycerate (PGA) to phosphoenol pyruvate (PEP). It is also a crucial link between glycolysis and the tricarboxylic acid (TCA) pathway. The depletion of PEP has recently been associated with the emergence of non-replicating drug resistant bacteria. Enolase is also known to exhibit multiple alternate functions, such as promoting tissue invasion via its role as a plasminogen (Plg) receptor. In addition, proteomic studies have identified the presence of enolase in the Mtb degradosome and in biofilms. However, the precise role in these processes has not been elaborated. The enzyme was recently identified as a target for 2-amino thiazoles - a novel class of anti-mycobacterials. In vitro assays and characterization of this enzyme were unsuccessful due to the inability to obtain functional recombinant protein. In the present study, we report the expression and characterization of enolase using Mtb H37Ra as a host strain. Our study demonstrates that the enzyme activity and alternate functions of this protein are significantly impacted by the choice of expression host (Mtb H37Ra or E. coli). Detailed analysis of the protein from each source revealed subtle differences in the post-translational modifications. Lastly, our study confirms the role of enolase in Mtb biofilm formation and describes the potential for inhibiting this process.
Collapse
Affiliation(s)
- Ajay Kumar
- Department of Biotechnology National Institute of Pharmaceutical Education and Research (NIPER), Phase X, Sector 67, SAS Nagar, Punjab, 160062, India
| | - Vishant Mahendra Boradia
- Department of Biotechnology National Institute of Pharmaceutical Education and Research (NIPER), Phase X, Sector 67, SAS Nagar, Punjab, 160062, India
| | - Apurwa Mahajan
- Council of Scientific and Industrial Research -Institute of Microbial Technology (CSIR-IMTECH), Sector 39 A, Chandigarh, 160036, India
| | - S Kumaran
- Council of Scientific and Industrial Research -Institute of Microbial Technology (CSIR-IMTECH), Sector 39 A, Chandigarh, 160036, India
| | - Manoj Raje
- Council of Scientific and Industrial Research -Institute of Microbial Technology (CSIR-IMTECH), Sector 39 A, Chandigarh, 160036, India
| | - Chaaya Iyengar Raje
- Department of Biotechnology National Institute of Pharmaceutical Education and Research (NIPER), Phase X, Sector 67, SAS Nagar, Punjab, 160062, India.
| |
Collapse
|
5
|
R S, Mahalakshmi S, Kumaran S, Kadaikunnan S, Abbas G, Muthu S. Structural, electronic, intermolecular interaction, reactivity, vibrational spectroscopy, charge transfer, Hirshfeld surface analysis, pharmacological and hydropathy plot on 5-Bromo nicotinic acid - Antiviral study (Hepatitis A, B, and C). Heliyon 2023; 9:e19965. [PMID: 37809934 PMCID: PMC10559560 DOI: 10.1016/j.heliyon.2023.e19965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/22/2023] [Accepted: 09/07/2023] [Indexed: 10/10/2023] Open
Abstract
The therapeutic properties of 5-Bromonicotinatic acid (5BNA) were studied for antiviral illnesses like Hepatitis A, Hepatitis B and Hepatitis C and the influence of electron-donating and electron-withdrawing properties of functional groups on the nicotinic acid was evaluated and represented in this study using the DFT approach. The molecular parameters were determined for both gases as well as for various solvent phases. The reactive areas in the compound are examined utilising Fukui analysis. The molecular interactions are accomplished by recognising the different types of bonding found in the compound using the AIM, ELF, LOL, RDG and IRI. Solvation investigations were demonstrated to have an influence on molecular orbital energy, ESP, UV-Vis and NLO analyses. Electron-hole, NBO and Hirshfeld investigations are used to investigate the transfer of charges and interactions inside the molecule. The method of vibrational spectroscopy (IR and Raman) is used to differentiate and identify the various types of vibrations displayed by the compound. The hydropathy plots for the proteins 2A4O, 6CWD and 2OC8 associated with Hepatitis A, Hepatitis B and Hepatitis C illustrate the disquiet and attraction of the amino acids towards the water.
Collapse
Affiliation(s)
- Sravanthi R
- Department of Physics, Ethiraj College for Women, Chennai, 600008, Tamil Nadu, India
- University of Madras, Chennai, 600005, Tamil Nadu, India
| | - S. Mahalakshmi
- Department of Physics, Ethiraj College for Women, Chennai, 600008, Tamil Nadu, India
| | - S. Kumaran
- Department of ECE, Saveetha Engineering College, Thandalam, Chennai, 602105, Tamil Nadu, India
| | - Shine Kadaikunnan
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Ghulam Abbas
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr 15, 76131, Karlsruhe, Germany
| | - S. Muthu
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, 604407, Tamil Nadu, India
| |
Collapse
|
6
|
Thamarai A, Raja M, Sakthivel S, Kumaran S, Muthu S, Narayana B, Ramesh P, Sevvanthi S, Javed S, Naick BN, Irfan A. The chemical reactivity and antimalarial investigation of crystal structure (2E)-3-(biphenyl-4-yl)-1-(4-chlorophenyl)prop-2-en-1-one and hydroxyphenyl, nitrophenyl substituted chalcone derivative molecules. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135001] [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: 01/21/2023]
|
7
|
Appel S, Bagdasarian Z, Basilico D, Bellini G, Benziger J, Biondi R, Caccianiga B, Calaprice F, Caminata A, Cavalcante P, Chepurnov A, D'Angelo D, Derbin A, Di Giacinto A, Di Marcello V, Ding XF, Di Ludovico A, Di Noto L, Drachnev I, Franco D, Galbiati C, Ghiano C, Giammarchi M, Goretti A, Göttel AS, Gromov M, Guffanti D, Ianni A, Ianni A, Jany A, Kobychev V, Korga G, Kumaran S, Laubenstein M, Litvinovich E, Lombardi P, Lomskaya I, Ludhova L, Lukyanchenko G, Machulin I, Martyn J, Meroni E, Miramonti L, Misiaszek M, Muratova V, Nugmanov R, Oberauer L, Orekhov V, Ortica F, Pallavicini M, Papp L, Pelicci L, Penek Ö, Pietrofaccia L, Pilipenko N, Pocar A, Raikov G, Ranalli MT, Ranucci G, Razeto A, Re A, Redchuk M, Rossi N, Schönert S, Semenov D, Settanta G, Skorokhvatov M, Singhal A, Smirnov O, Sotnikov A, Tartaglia R, Testera G, Unzhakov E, Villante FL, Vishneva A, Vogelaar RB, von Feilitzsch F, Wojcik M, Wurm M, Zavatarelli S, Zuber K, Zuzel G. Improved Measurement of Solar Neutrinos from the Carbon-Nitrogen-Oxygen Cycle by Borexino and Its Implications for the Standard Solar Model. Phys Rev Lett 2022; 129:252701. [PMID: 36608219 DOI: 10.1103/physrevlett.129.252701] [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] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 09/01/2022] [Accepted: 10/05/2022] [Indexed: 06/17/2023]
Abstract
We present an improved measurement of the carbon-nitrogen-oxygen (CNO) solar neutrino interaction rate at Earth obtained with the complete Borexino Phase-III dataset. The measured rate, R_{CNO}=6.7_{-0.8}^{+2.0} counts/(day×100 tonnes), allows us to exclude the absence of the CNO signal with about 7σ C.L. The correspondent CNO neutrino flux is 6.6_{-0.9}^{+2.0}×10^{8} cm^{-2} s^{-1}, taking into account the neutrino flavor conversion. We use the new CNO measurement to evaluate the C and N abundances in the Sun with respect to the H abundance for the first time with solar neutrinos. Our result of N_{CN}=(5.78_{-1.00}^{+1.86})×10^{-4} displays a ∼2σ tension with the "low-metallicity" spectroscopic photospheric measurements. Furthermore, our result used together with the ^{7}Be and ^{8}B solar neutrino fluxes, also measured by Borexino, permits us to disfavor at 3.1σ C.L. the "low-metallicity" standard solar model B16-AGSS09met as an alternative to the "high-metallicity" standard solar model B16-GS98.
Collapse
Affiliation(s)
- S Appel
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - Z Bagdasarian
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - D Basilico
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - G Bellini
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - J Benziger
- Chemical Engineering Department, Princeton University, Princeton, New Jersey 08544, USA
| | - R Biondi
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - B Caccianiga
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - F Calaprice
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Caminata
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - P Cavalcante
- Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - A Chepurnov
- Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119234 Moscow, Russia
| | - D D'Angelo
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - A Derbin
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Di Giacinto
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - V Di Marcello
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - X F Ding
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Di Ludovico
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - L Di Noto
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - I Drachnev
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - D Franco
- AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris Cedex 13, France
| | - C Galbiati
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
- Gran Sasso Science Institute, 67100 L'Aquila, Italy
| | - C Ghiano
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - M Giammarchi
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - A Goretti
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A S Göttel
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - M Gromov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119234 Moscow, Russia
| | - D Guffanti
- Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - Aldo Ianni
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - Andrea Ianni
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Jany
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - V Kobychev
- Kiev Institute for Nuclear Research, 03680 Kiev, Ukraine
| | - G Korga
- Department of Physics, Royal Holloway University of London, Egham, Surrey,TW20 0EX, United Kingdom
- Institute of Nuclear Research (Atomki), Debrecen, Hungary
| | - S Kumaran
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - M Laubenstein
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - E Litvinovich
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - P Lombardi
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - I Lomskaya
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - L Ludhova
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - G Lukyanchenko
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - I Machulin
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - J Martyn
- Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - E Meroni
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - L Miramonti
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - M Misiaszek
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - V Muratova
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - R Nugmanov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - L Oberauer
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - V Orekhov
- Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - F Ortica
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi e INFN, 06123 Perugia, Italy
| | - M Pallavicini
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - L Papp
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - L Pelicci
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - Ö Penek
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - L Pietrofaccia
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - N Pilipenko
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Pocar
- Amherst Center for Fundamental Interactions and Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - G Raikov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - M T Ranalli
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - G Ranucci
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - A Razeto
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - A Re
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - M Redchuk
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - N Rossi
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - S Schönert
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - D Semenov
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - G Settanta
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - M Skorokhvatov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - A Singhal
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - O Smirnov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A Sotnikov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - R Tartaglia
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
| | - G Testera
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - E Unzhakov
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - F L Villante
- INFN Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
- Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila, 67100 L'Aquila, Italy
| | - A Vishneva
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - R B Vogelaar
- Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - F von Feilitzsch
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - M Wojcik
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - M Wurm
- Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - S Zavatarelli
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - K Zuber
- Department of Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - G Zuzel
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| |
Collapse
|
8
|
Kumaran S, Singh M, Johar IP, Singh S, Singh P, Kaur M. Tourism destination marketing and international tourists satisfaction: A study on international heritage site at Mamallapuram, Tamil Nadu. Journal of Information and Optimization Sciences 2022. [DOI: 10.1080/02522667.2022.2128522] [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: 12/04/2022]
Affiliation(s)
- S. Kumaran
- Alliance School of Business, Alliance University, Bangalore, Karnataka, India
| | - Manjeet Singh
- Department of Tourism and Travel Management, Central University of Jammu, Jammu, India
| | | | - Surinder Singh
- School of Management, Lovely Professional University, Phagwara, Punjab, India
| | - Parambir Singh
- Chitkara School of Hospitality, Chitkara University, Punjab, India
| | - Manmeet Kaur
- School of Tourism and Hospitality Service Management, Indira Gandhi National Open University, Delhi, India
| |
Collapse
|
9
|
Khatri B, Pramanick I, Malladi SK, Rajmani RS, Kumar S, Ghosh P, Sengupta N, Rahisuddin R, Kumar N, Kumaran S, Ringe RP, Varadarajan R, Dutta S, Chatterjee J. A dimeric proteomimetic prevents SARS-CoV-2 infection by dimerizing the spike protein. Nat Chem Biol 2022; 18:1046-1055. [PMID: 35654847 PMCID: PMC9512702 DOI: 10.1038/s41589-022-01060-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 05/10/2022] [Indexed: 11/17/2022]
Abstract
Protein tertiary structure mimetics are valuable tools to target large protein-protein interaction interfaces. Here, we demonstrate a strategy for designing dimeric helix-hairpin motifs from a previously reported three-helix-bundle miniprotein that targets the receptor-binding domain (RBD) of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2). Through truncation of the third helix and optimization of the interhelical loop residues of the miniprotein, we developed a thermostable dimeric helix-hairpin. The dimeric four-helix bundle competes with the human angiotensin-converting enzyme 2 (ACE2) in binding to RBD with 2:2 stoichiometry. Cryogenic-electron microscopy revealed the formation of dimeric spike ectodomain trimer by the four-helix bundle, where all the three RBDs from either spike protein are attached head-to-head in an open conformation, revealing a novel mechanism for virus neutralization. The proteomimetic protects hamsters from high dose viral challenge with replicative SARS-CoV-2 viruses, demonstrating the promise of this class of peptides that inhibit protein-protein interaction through target dimerization.
Collapse
Affiliation(s)
- Bhavesh Khatri
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India
| | - Ishika Pramanick
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India
| | | | - Raju S Rajmani
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India
| | - Sahil Kumar
- Virology Unit, Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Chandigarh, India
| | - Pritha Ghosh
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India
| | - Nayanika Sengupta
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India
| | - R Rahisuddin
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Chandigarh, India
| | - Narender Kumar
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Chandigarh, India
| | - S Kumaran
- Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Chandigarh, India
| | - Rajesh P Ringe
- Virology Unit, Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR), Chandigarh, India
| | | | - Somnath Dutta
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India.
| | - Jayanta Chatterjee
- Molecular Biophysics Unit (MBU), Indian Institute of Science, Bangalore, India.
| |
Collapse
|
10
|
Kumaran S, Parthasarathy K. Rhodium-Catalyzed Annulations and Heck Coupling/Aza-Michael Addition for the Synthesis of Benzothiadiazinoisoquinoline 6,6-Dioxides and Benzothiadiazinoisoindole 5,5-Dioxides, Respectively. J Org Chem 2022; 87:11989-12000. [PMID: 36049131 DOI: 10.1021/acs.joc.2c00964] [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: 11/30/2022]
Abstract
A new and efficient protocol has been demonstrated for the synthesis of benzothiadiazinoisoquinoline 6,6-dioxides and benzothiadiazinoisoindole 5,5-dioxides in good to excellent yields. These compounds are formed through a sequential Rh(III)-catalyzed C-H cyclization of dihydrophenylbenzothiadiazine 1,1-dioxides with alkynes and oxidative Heck coupling/aza-Michael addition of dihydrophenylbenzothiadiazine 1,1-dioxides with acrylates, respectively.
Collapse
Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry, University of Madras, Guindy Campus, Tamilnadu, Chennai 600025, India
| | - Kanniyappan Parthasarathy
- Department of Organic Chemistry, University of Madras, Guindy Campus, Tamilnadu, Chennai 600025, India
| |
Collapse
|
11
|
Thamarai A, Vadamalar R, Kumaran S, Ramesh P, Muthu S, Aayisha S, Raja M, Narayana B, Irfan A. Investigations on spectroscopic, ADMET properties and drug-likeness, molecular docking, chemical properties of (2E)-3-(biphenyl-4-yl)-1-(2,4-dichlorophenyl)-prop-2-en-1-one by combined density-functional theory. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132973] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
12
|
Vignesh P, Abraham A, Kumaran S. Microstructural correlation of cross rolling temperature of AT55 magnesium alloy in mechanical and formability behaviour. Micron 2022; 160:103305. [PMID: 35714470 DOI: 10.1016/j.micron.2022.103305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/31/2022] [Accepted: 06/06/2022] [Indexed: 11/15/2022]
Abstract
The development of magnesium alloy includes two key aspects, such as microstructure and texture, which play vital roles in mechanical and forming behaviour. In this study, cross-rolled Mg-5Al-5Sn alloy at various temperatures (350 °C, 400 °C, and 450 °C) with a 60% reduction in thickness was investigated. The effect of cross rolling temperature on the Mg-5Al-5Sn alloy microstructure, texture, tensile properties, and formability was studied. The yield strength increases from 114 MPa to 150 MPa with decreasing rolling temperature, which is attributed to grain refinement phenomena. This finding demonstrates that the AT55 Mg alloy possesses an impact on cross rolling temperature, viz. the formability increases with increases in cross rolling temperature. The alloy processed at 350 °C shows better strength and less formability than that of the alloy processed at 450 °C ( lower strength but good formability at room temperature, with an Erichsen value of 4.3 mm).
Collapse
Affiliation(s)
- P Vignesh
- Green Energy Materials and Manufacturing Research Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, India
| | - Amal Abraham
- Green Energy Materials and Manufacturing Research Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, India
| | - S Kumaran
- Green Energy Materials and Manufacturing Research Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, India.
| |
Collapse
|
13
|
Agostini M, Altenmüller K, Appel S, Atroshchenko V, Bagdasarian Z, Basilico D, Bellini G, Benziger J, Biondi R, Bravo D, Caccianiga B, Calaprice F, Caminata A, Cavalcante P, Chepurnov A, D'Angelo D, Davini S, Derbin A, Di Giacinto A, Di Marcello V, Ding XF, Di Ludovico A, Di Noto L, Drachnev I, Formozov A, Franco D, Galbiati C, Ghiano C, Giammarchi M, Goretti A, Göttel AS, Gromov M, Guffanti D, Ianni A, Ianni A, Jany A, Jeschke D, Kobychev V, Korga G, Kumaran S, Laubenstein M, Litvinovich E, Lombardi P, Lomskaya I, Ludhova L, Lukyanchenko G, Lukyanchenko L, Machulin I, Martyn J, Meroni E, Meyer M, Miramonti L, Misiaszek M, Muratova V, Neumair B, Nieslony M, Nugmanov R, Oberauer L, Orekhov V, Ortica F, Pallavicini M, Papp L, Pelicci L, Penek Ö, Pietrofaccia L, Pilipenko N, Pocar A, Raikov G, Ranalli MT, Ranucci G, Razeto A, Re A, Redchuk M, Romani A, Rossi N, Schönert S, Semenov D, Settanta G, Skorokhvatov M, Singhal A, Smirnov O, Sotnikov A, Suvorov Y, Tartaglia R, Testera G, Thurn J, Unzhakov E, Vishneva A, Vogelaar RB, von Feilitzsch F, Wessel A, Wojcik M, Wonsak B, Wurm M, Zavatarelli S, Zuber K, Zuzel G. First Directional Measurement of Sub-MeV Solar Neutrinos with Borexino. Phys Rev Lett 2022; 128:091803. [PMID: 35302807 DOI: 10.1103/physrevlett.128.091803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
We report the measurement of sub-MeV solar neutrinos through the use of their associated Cherenkov radiation, performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The measurement is achieved using a novel technique that correlates individual photon hits of events to the known position of the Sun. In an energy window between 0.54 to 0.74 MeV, selected using the dominant scintillation light, we have measured 10 887_{-2103}^{+2386}(stat)±947(syst) (68% confidence interval) solar neutrinos out of 19 904 total events. This corresponds to a ^{7}Be neutrino interaction rate of 51.6_{-12.5}^{+13.9} counts/(day·100 ton), which is in agreement with the standard solar model predictions and the previous spectroscopic results of Borexino. The no-neutrino hypothesis can be excluded with >5σ confidence level. For the first time, we have demonstrated the possibility of utilizing the directional Cherenkov information for sub-MeV solar neutrinos, in a large-scale, high light yield liquid scintillator detector. This measurement provides an experimental proof of principle for future hybrid event reconstruction using both Cherenkov and scintillation signatures simultaneously.
Collapse
Affiliation(s)
- M Agostini
- Physik-Department, Technische Universität München, 85748 Garching, Germany
- Department of Physics and Astronomy, University College London, London, WC1E 6BT, United Kingdom
| | - K Altenmüller
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - S Appel
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - V Atroshchenko
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - Z Bagdasarian
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - D Basilico
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - G Bellini
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - J Benziger
- Chemical Engineering Department, Princeton University, Princeton, New Jersey 08544, USA
| | - R Biondi
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - D Bravo
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - B Caccianiga
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - F Calaprice
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Caminata
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - P Cavalcante
- Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - A Chepurnov
- Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119234 Moscow, Russia
| | - D D'Angelo
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - S Davini
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - A Derbin
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Di Giacinto
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - V Di Marcello
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - X F Ding
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Di Ludovico
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - L Di Noto
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - I Drachnev
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Formozov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - D Franco
- APC, Université de Paris, CNRS, Astroparticule et Cosmologie, Paris F-75013, France
| | - C Galbiati
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
- Gran Sasso Science Institute, 67100 L'Aquila, Italy
| | - C Ghiano
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - M Giammarchi
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - A Goretti
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A S Göttel
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - M Gromov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 119234 Moscow, Russia
| | - D Guffanti
- Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - Aldo Ianni
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - Andrea Ianni
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - A Jany
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - D Jeschke
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - V Kobychev
- Institute for Nuclear Research of NAS Ukraine, 03028 Kyiv, Ukraine
| | - G Korga
- Department of Physics, School of Engineering, Physical and Mathematical Sciences, Royal Holloway, University of London, Egham, TW20 OEX, United Kingdom
- Institute of Nuclear Research (Atomki), 4026, Debrecen, Hungary
| | - S Kumaran
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - M Laubenstein
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - E Litvinovich
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - P Lombardi
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - I Lomskaya
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - L Ludhova
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - G Lukyanchenko
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - L Lukyanchenko
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - I Machulin
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - J Martyn
- Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - E Meroni
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - M Meyer
- Department of Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - L Miramonti
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - M Misiaszek
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - V Muratova
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - B Neumair
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - M Nieslony
- Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - R Nugmanov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - L Oberauer
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - V Orekhov
- Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - F Ortica
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi e INFN, 06123 Perugia, Italy
| | - M Pallavicini
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - L Papp
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - L Pelicci
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - Ö Penek
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - L Pietrofaccia
- Physics Department, Princeton University, Princeton, New Jersey 08544, USA
| | - N Pilipenko
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Pocar
- Amherst Center for Fundamental Interactions and Physics Department, UMass, Amherst, Massachusetts 01003, USA
| | - G Raikov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
| | - M T Ranalli
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - G Ranucci
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - A Razeto
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - A Re
- Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milano, Italy
| | - M Redchuk
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - A Romani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi e INFN, 06123 Perugia, Italy
| | - N Rossi
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - S Schönert
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - D Semenov
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - G Settanta
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - M Skorokhvatov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
| | - A Singhal
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - O Smirnov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A Sotnikov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Y Suvorov
- National Research Centre Kurchatov Institute, 123182 Moscow, Russia
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - R Tartaglia
- INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
| | - G Testera
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - J Thurn
- Department of Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - E Unzhakov
- St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
| | - A Vishneva
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - R B Vogelaar
- Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - F von Feilitzsch
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - A Wessel
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
- Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
- III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
| | - M Wojcik
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| | - B Wonsak
- University of Hamburg, Institute of Experimental Physics, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M Wurm
- Institute of Physics and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - S Zavatarelli
- Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
| | - K Zuber
- Department of Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - G Zuzel
- M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
| |
Collapse
|
14
|
Surenthirakumaran R, Coonghe PAD, Kesavan R, Kumaran S, Sasrubi S. Depression and Associated Factors From COVID-19-Related Quarantine in Jaffna District, Sri Lanka. Asia Pac J Public Health 2022; 34:413-415. [DOI: 10.1177/10105395211066806] [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: 11/16/2022]
Affiliation(s)
- R. Surenthirakumaran
- Department of Community and Family Medicine, Faculty of Medicine, University of Jaffna, Jaffna, Sri Lanka
| | - P. A. D. Coonghe
- Department of Community and Family Medicine, Faculty of Medicine, University of Jaffna, Jaffna, Sri Lanka
| | - R. Kesavan
- Office of the Provincial Director of Health Services, Northern Province, Sri Lanka
| | - S. Kumaran
- Department of Community and Family Medicine, Faculty of Medicine, University of Jaffna, Jaffna, Sri Lanka
| | - S. Sasrubi
- Department of Community and Family Medicine, Faculty of Medicine, University of Jaffna, Jaffna, Sri Lanka
| |
Collapse
|
15
|
Bharathi S, Ramesh B, Kumaran S, Radhakrishnan M, Saravanan D, Saravanan P, Pugazhvendan SR, Nalinasundari MS. Development of nanobiomaterial for wound healing based on silver nanoparticles loaded on chitosan hydrogel. 3 Biotech 2021; 11:490. [PMID: 34790514 DOI: 10.1007/s13205-021-03030-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Accepted: 10/13/2021] [Indexed: 11/28/2022] Open
Abstract
The objective of this study was to develop nanobiomaterial containing silver nanoparticles (AgNPs) for wound healing. AgNPs were synthesized using Saussurea lappa (Sl) aqueous root extract as reducing agent and were characterized physico-chemically using UV-vis spectral studies, XRD, FESEM, TEM, FTIR spectral analysis, DLS, and TG-DSC. Sl AgNPs production was optimized using response surface methodology. The cytotoxicity of Sl AgNPs was assessed by THP1 cell lines, which showed that Sl AgNPs were nontoxic with an IC50 of 151.10 μg/mL at 24 h. For topical application, Sl AgNPs was loaded on chitosan hydrogel was characterized through spreadability, in vitro release, antibacterial activity, swelling behavior, and SEM analysis. The chitosan Sl AgNPs hydrogel was subjected acute dermal toxicity test using Wistar albino rats and was found to be nontoxic. The excisional wound model was created along with Pseudomonas aeruginosa as an inoculant in Wistar albino rats. The chitosan Sl AgNPs hydrogel treated rats showed excellent wound healing qualities, lower bacterial counts, and enhanced production of connective tissues. Our findings strongly suggest that AgNPs synthesized from Saussurea lappa root extract loaded on chitosan hydrogel possibly applied for the remedy of infectious wounds at a concentration of 0.1 mg of Sl AgNPs/g of hydrogel. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03030-0.
Collapse
Affiliation(s)
- S Bharathi
- Research Department of Microbiology, Sri Sankara Arts and Science College (Autonomous), Enathur, Kanchipuram, Tamil Nadu 631561 India
- Research Department of Zoology, Queen Mary's College (Autonomous), Chennai, Tamil Nadu 600004 India
| | - B Ramesh
- Research Department of Biotechnology, Sri Sankara Arts and Science College (Autonomous), Enathur, Kanchipuram, Tamil Nadu 631561 India
| | - S Kumaran
- Centre for Drug Discovery and Development, Sathyabama Institute of Science and Technology (Deemed to be University), Chennai, Tamil Nadu 600119 India
- School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology (Deemed to be University), Chennai, Tamil Nadu 600119 India
| | - M Radhakrishnan
- Centre for Drug Discovery and Development, Sathyabama Institute of Science and Technology (Deemed to be University), Chennai, Tamil Nadu 600119 India
| | - D Saravanan
- Centre for Laboratory Animal Technology and Research, Sathyabama Institute of Science and Technology (Deemed to be University), Chennai, Tamil Nadu 600119 India
| | - P Saravanan
- Research Department of Biotechnology, Sri Sankara Arts and Science College (Autonomous), Enathur, Kanchipuram, Tamil Nadu 631561 India
| | - S R Pugazhvendan
- Department of Zoology-DDE Wing, Annamalai University, Cuddalore District, Tamil Nadu 607001 India
- Department of Zoology, Arignar Anna Government Arts College, Cheyyar, Tamil Nadu 604407 India
| | - M S Nalinasundari
- Research Department of Zoology, Queen Mary's College (Autonomous), Chennai, Tamil Nadu 600004 India
| |
Collapse
|
16
|
Khatri B, Raghunathan S, Chakraborti S, Rahisuddin R, Kumaran S, Tadala R, Wagh P, Priyakumar UD, Chatterjee J. Desolvation of Peptide Bond by O to S Substitution Impacts Protein Stability. Angew Chem Int Ed Engl 2021; 60:24870-24874. [PMID: 34519402 DOI: 10.1002/anie.202110978] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Revised: 09/10/2021] [Indexed: 12/31/2022]
Abstract
Amino acid side chains are key to fine-tuning the microenvironment polarity in proteins composed of polar amide bonds. Here, we report that substituting an oxygen atom of the backbone amide bond with sulfur atom desolvates the thioamide bond, thereby increasing its lipophilicity. The impact of such local desolvation by O to S substitution in proteins was tested by synthesizing thioamidated variants of Pin1 WW domain. We observe that a thioamide acts in synergy with nonpolar amino acid side chains to reduce the microenvironment polarity and increase protein stability by more than 14 °C. Through favorable van der Waals and hydrogen bonding interactions, this single atom substitution significantly stabilizes proteins without altering the amino acid sequence and structure of the native protein.
Collapse
Affiliation(s)
- Bhavesh Khatri
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| | - Shampa Raghunathan
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad, 500032, India.,Present Address: École Centrale School of Engineering, Mahindra University, Hyderabad, 500043, India
| | - Sohini Chakraborti
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| | - R Rahisuddin
- CSIR- Institute of Microbial Technology, Chandigarh 1, 60036, India
| | - S Kumaran
- CSIR- Institute of Microbial Technology, Chandigarh 1, 60036, India
| | | | | | - U Deva Priyakumar
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad, 500032, India
| | - Jayanta Chatterjee
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| |
Collapse
|
17
|
Khatri B, Raghunathan S, Chakraborti S, Rahisuddin R, Kumaran S, Tadala R, Wagh P, Priyakumar UD, Chatterjee J. Desolvation of Peptide Bond by O to S Substitution Impacts Protein Stability. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110978] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Bhavesh Khatri
- Molecular Biophysics Unit Indian Institute of Science Bangalore 560012 India
| | - Shampa Raghunathan
- Center for Computational Natural Sciences and Bioinformatics International Institute of Information Technology Hyderabad 500032 India
- Present Address: École Centrale School of Engineering Mahindra University Hyderabad 500043 India
| | - Sohini Chakraborti
- Molecular Biophysics Unit Indian Institute of Science Bangalore 560012 India
| | - R. Rahisuddin
- CSIR- Institute of Microbial Technology Chandigarh 1 60036 India
| | - S. Kumaran
- CSIR- Institute of Microbial Technology Chandigarh 1 60036 India
| | | | | | - U. Deva Priyakumar
- Center for Computational Natural Sciences and Bioinformatics International Institute of Information Technology Hyderabad 500032 India
| | - Jayanta Chatterjee
- Molecular Biophysics Unit Indian Institute of Science Bangalore 560012 India
| |
Collapse
|
18
|
Singh RP, Saini N, Sharma G, Rahisuddin R, Patel M, Kaushik A, Kumaran S. Moonlighting Biochemistry of Cysteine Synthase: A Species-specific Global Regulator. J Mol Biol 2021; 433:167255. [PMID: 34547327 DOI: 10.1016/j.jmb.2021.167255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 09/10/2021] [Accepted: 09/12/2021] [Indexed: 11/18/2022]
Abstract
Cysteine Synthase (CS), the enzyme that synthesizes cysteine, performs non-canonical regulatory roles by binding and modulating functions of disparate proteins. Beyond its role in catalysis and regulation in the cysteine biosynthesis pathway, it exerts its moonlighting effect by binding to few other proteins which possess a C-terminal "CS-binding motif", ending with a terminal ILE. Therefore, we hypothesized that CS might regulate many other disparate proteins with the "CS-binding motif". In this study, we developed an iterative sequence matching method for mapping moonlighting biochemistry of CS and validated our prediction by analytical and structural approaches. Using a minimal protein-peptide interaction system, we show that five previously unknown CS-binder proteins that participate in diverse metabolic processes interact with CS in a species-specific manner. Furthermore, results show that signatures of protein-protein interactions, including thermodynamic, competitive-inhibition, and structural features, highly match the known CS-Binder, serine acetyltransferase (SAT). Together, the results presented in this study allow us to map the extreme multifunctional space (EMS) of CS and reveal the biochemistry of moonlighting space, a subset of EMS. We believe that the integrated computational and experimental workflow developed here could be further modified and extended to study protein-specific moonlighting properties of multifunctional proteins.
Collapse
Affiliation(s)
- Ravi Pratap Singh
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India
| | - Neha Saini
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India
| | - Gaurav Sharma
- Institute of Bioinformatics and Applied Biotechnology (IBAB), Electronic city, Bengaluru, Karnataka 560100, India
| | - R Rahisuddin
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India. https://twitter.com/RahisuddinAlig
| | - Madhuri Patel
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India
| | - Abhishek Kaushik
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India
| | - S Kumaran
- G. N. Ramachandran Protein Centre, Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), Sector 39-A, Chandigarh 160036, India.
| |
Collapse
|
19
|
Saini M, Singh N, Kumar N, Kumaran S, Mehndiratta A, Srivastava MP. Cortical reorganization in stroke patients using upper-limb robotic rehabilitation therapy. J Neurol Sci 2021. [DOI: 10.1016/j.jns.2021.118758] [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: 10/20/2022]
|
20
|
Kumaran S, Parthasarathy K. Rh(III)-Catalyzed Oxidative C-2 Coupling of N-Pyridinylindoles with Benzo[ b]thiophene 1,1-Dioxides via C-H Bond Activation. J Org Chem 2021; 86:7987-7999. [PMID: 34096307 DOI: 10.1021/acs.joc.1c00301] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient Rh(III)-catalyzed cross-dehydrogenative coupling of N-pyridinylindoles with benzo[b]thiophene 1,1-dioxides has been developed through directing-group-assisted C-H activation. This transformation constructs a new C-C bond from two inert C-H bonds in a one-pot reaction. The present reaction is compatible with various functional groups with respect to indoles and benzothiophene[b] 1,1-dioxides. Furthermore, the emission properties of synthesized compounds have been explored.
Collapse
Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai, Tamilnadu 600025, India
| | - Kanniyappan Parthasarathy
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai, Tamilnadu 600025, India
| |
Collapse
|
21
|
Kaushik A, Rahisuddin R, Saini N, Singh RP, Kaur R, Koul S, Kumaran S. Molecular mechanism of selective substrate engagement and inhibitor disengagement of cysteine synthase. J Biol Chem 2020; 296:100041. [PMID: 33162395 PMCID: PMC7948407 DOI: 10.1074/jbc.ra120.014490] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 10/31/2020] [Accepted: 11/08/2020] [Indexed: 12/20/2022] Open
Abstract
O-acetyl serine sulfhydrylase (OASS), referred to as cysteine synthase (CS), synthesizes cysteine from O-acetyl serine (OAS) and sulfur in bacteria and plants. The inherent challenge for CS is to overcome 4 to 6 log-folds stronger affinity for its natural inhibitor, serine acetyltransferase (SAT), as compared with its affinity for substrate, OAS. Our recent study showed that CS employs a novel competitive-allosteric mechanism to selectively recruit its substrate in the presence of natural inhibitor. In this study, we trace the molecular features that control selective substrate recruitment. To generalize our findings, we used CS from three different bacteria (Haemophilus, Salmonella, and Mycobacterium) as our model systems and analyzed structural and substrate-binding features of wild-type CS and its ∼13 mutants. Results show that CS uses a noncatalytic residue, M120, located 20 Å away from the reaction center, to discriminate in favor of substrate. M120A and background mutants display significantly reduced substrate binding, catalytic efficiency, and inhibitor binding. Results shows that M120 favors the substrate binding by selectively enhancing the affinity for the substrate and disengaging the inhibitor by 20 to 286 and 5- to 3-folds, respectively. Together, M120 confers a net discriminative force in favor of substrate by 100- to 858-folds.
Collapse
Affiliation(s)
- Abhishek Kaushik
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - R Rahisuddin
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - Neha Saini
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - Ravi P Singh
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - Rajveer Kaur
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - Sukirte Koul
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India
| | - S Kumaran
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39-A, Chandigarh, India.
| |
Collapse
|
22
|
Kumaran S, Prabhakaran M, Mariyammal N, Parthasarathy K. Catalyst-free 1,6-conjugate addition of indoles and 4-hydroxycoumarins to para-quinone methides: synthesis of unsymmetrical triarylmethanes. Org Biomol Chem 2020; 18:7837-7841. [PMID: 32996543 DOI: 10.1039/d0ob01789b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalyst-free 1,6-conjugate addition of indoles and 4-hydroxycoumarins to para-quinone methides is reported. This protocol allowed us to access a range of unsymmetrical triarylmethanes in good to excellent yields. The outlined procedure is operationally simple, efficient, atom and step economical. The synthesized heterocyclic triarylmethanes were further converted into highly substituted indoloisoquinolines and pyranochromenones via metal-catalyzed C-H activation/annulation.
Collapse
Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry, University of Madras, Guindy Campus, Tamil Nadu, Chennai 600025, India.
| | | | | | | |
Collapse
|
23
|
Bharathi S, Kumaran S, Suresh G, Ramesh M, Thangamani V, Pugazhvendan S, Sathiyamurthy K. Extracellular synthesis of nanoselenium from fresh water bacteria Bacillus sp., and its validation of antibacterial and cytotoxic potential. Biocatalysis and Agricultural Biotechnology 2020. [DOI: 10.1016/j.bcab.2020.101655] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
24
|
Kumaran S, Saritha R, Gurumurthy P, Parthasarathy K. Synthesis of Fused Spiropyrrolidine Oxindoles Through 1,3-Dipolar Cycloaddition of Azomethine Ylides Prepared from Isatins and α-Amino Acids with Heterobicyclic Alkenes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000247] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry; University of Madras; Guindy Campus -600025 Chennai India
| | - Rajendhiran Saritha
- Department of Organic Chemistry; University of Madras; Guindy Campus -600025 Chennai India
| | - Palanivelu Gurumurthy
- Department of Organic Chemistry; University of Madras; Guindy Campus -600025 Chennai India
| | | |
Collapse
|
25
|
Agostini M, Altenmüller K, Appel S, Atroshchenko V, Bagdasarian Z, Basilico D, Bellini G, Benziger J, Bick D, Bravo D, Caccianiga B, Calaprice F, Caminata A, Cavalcante P, Chepurnov A, D’Angelo D, Davini S, Derbin A, Di Giacinto A, Di Marcello V, Ding X, Di Ludovico A, Di Noto L, Drachnev I, Formozov A, Franco D, Galbiati C, Gschwender M, Ghiano C, Giammarchi M, Goretti A, Gromov M, Guffanti D, Hagner C, Houdy T, Hungerford E, Ianni A, Ianni A, Jany A, Jeschke D, Kobychev V, Korga G, Kumaran S, Lachenmaier T, Laubenstein M, Litvinovich E, Lombardi P, Lomskaya I, Ludhova L, Lukyanchenko G, Lukyanchenko L, Machulin I, Marcocci S, Martyn J, Meroni E, Meyer M, Miramonti L, Misiaszek M, Muratova V, Neumair B, Nieslony M, Nugmanov R, Oberauer L, Orekhov V, Ortica F, Pallavicini M, Papp L, Penek Ö, Pietrofaccia L, Pilipenko N, Pocar A, Raikov G, Ranalli M, Ranucci G, Razeto A, Re A, Redchuk M, Romani A, Rossi N, Rottenanger S, Schönert S, Semenov D, Skorokhvatov M, Smirnov O, Sotnikov A, Suvorov Y, Tartaglia R, Testera G, Thurn J, Unzhakov E, Vishneva A, Vogelaar R, von Feilitzsch F, Wojcik M, Wurm M, Zavatarelli S, Zuber K, Zuzel G. Improved measurement of
B8
solar neutrinos with
1.5 kt·y
of Borexino exposure. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.101.062001] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
26
|
Kumaran S, Parthasarathy K. Cobalt(III)-Catalyzed Synthesis of Fused Quinazolinones by C-H/N-H Annulation of 2-Arylquinazolinones with Alkynes. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901763] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry; University of Madras; Guindy Campus -600025 Chennai Tamilnadu India
| | - Kanniyappan Parthasarathy
- Department of Organic Chemistry; University of Madras; Guindy Campus -600025 Chennai Tamilnadu India
| |
Collapse
|
27
|
Krishna S, Sathishkumar P, Pugazhenthiran N, Guesh K, Mangalaraja RV, Kumaran S, Gracia-Pinilla MA, Anandan S. Magnetically recyclable CoFe2O4/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions. RSC Adv 2020; 10:16473-16480. [PMID: 35498872 PMCID: PMC9052941 DOI: 10.1039/d0ra00082e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Accepted: 03/27/2020] [Indexed: 11/29/2022] Open
Abstract
CoFe2O4/ZnO magnetic nanocatalysts were synthesized using a low-frequency ultrasound-assisted technique to enhance the optical, morphological, magnetic and catalytic properties of ZnO. The as-synthesized nanocatalysts were characterized by XRD, Raman, TEM, DR-UV-Vis and VSM analyses in order to confirm the expected modifications of the resulting nanocatalysts. The Raman spectral analysis revealed substitutional Zn2+ in the CoFe2O4/ZnO nanocatalyst. The as-synthesized material was tested for its catalytic activity in the degradation of Acid Blue (AB113), a known textile pollutant. The CoFe2O4 and CoFe2O4/ZnO nanocatalysts revealed the efficient catalytic degradation of AB113 in ambient conditions. The nanocatalyst dosage and the initial concentration of AB113 were varied by fixing one parameter as constant in order to determine the maximum catalytic efficiency with the minimum catalyst loading for AB113 degradation. The CoFe2O4/ZnO nanocatalyst demonstrated 10-fold enhanced mineralization of AB113 compared to the individual bare nanocatalysts, which could be achieved within 3 hours of catalytic degradation of AB113. The magnetic CoFe2O4/ZnO nanocatalyst was found to be stable for six consecutive recycles of AB113 degradation, which indicates that the catalytic efficiency of the nanocatalyst was retained after various numbers of cycles. CoFe2O4/ZnO magnetic nanocatalysts were synthesized using a low-frequency ultrasound-assisted technique to enhance the optical, morphological, magnetic and catalytic properties of ZnO.![]()
Collapse
Affiliation(s)
- S. Krishna
- Department of Chemistry
- Periyar Maniammai Institute of Science & Technology
- Thanjavur 613403
- India
| | | | - N. Pugazhenthiran
- Laboratorio de Tecnologías Limpias
- Facultad de Ingeniería
- Universidad Católica de la Santísima Concepción
- Concepción
- Chile
| | - Kiros Guesh
- Department of Chemistry
- Aksum University
- Axum 1010
- Ethiopia
| | - R. V. Mangalaraja
- Advanced Ceramics and Nanotechnology Laboratory
- Department of Materials Engineering
- Faculty of Engineering
- University of Concepcion
- Concepcion 4070409
| | - S. Kumaran
- Department of Biotechnology
- Periyar Maniammai Institute of Science & Technology
- Thanjavur 613 403
- India
| | - M. A. Gracia-Pinilla
- Universidad Autonoma de Nuevo Leon
- Facultad de Ciencias Físico-Matematicas
- Av. Universidad
- Cd. Universitaria
- San Nicolas de los Garza
| | - S. Anandan
- Nanomaterials and Solar Energy Conversion Lab
- Department of Chemistry
- National Institute of Technology
- Trichy 620015
- India
| |
Collapse
|
28
|
Kaur H, Kumaran S, Bhatia R, Chopra S, Nehra A. Effectiveness of homebased comprehensive neuropsychological rehabilitation for post stroke aphasia in limited resource settings: An fMRI based randomized controlled trial. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.303] [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: 11/28/2022]
|
29
|
Bhasin A, Srivastava P, Kumaran S, Pawan K, Mewar S. Bone marrow derived mononuclear stem cells in chronic stroke: Functional imaging & spectroscopic analysis. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.811] [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: 10/25/2022]
|
30
|
Thayakaran R, Perrins M, Gokhale KM, Kumaran S, Narendran P, Price MJ, Nirantharakumar K, Toulis KA. Impact of glycaemic control on fracture risk in 5368 people with newly diagnosed Type 1 diabetes: a time-dependent analysis. Diabet Med 2019; 36:1013-1019. [PMID: 30848519 DOI: 10.1111/dme.13945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/05/2019] [Indexed: 12/30/2022]
Abstract
AIMS To assess whether glycaemic control is associated with a lifelong increased risk of fracture in people with newly diagnosed Type 1 diabetes. METHODS People with newly diagnosed Type 1 diabetes between 1 January 1995 and 10 May 2016 were identified in The Health Improvement Network database. Longitudinal HbA1c measurements from diagnosis to fracture or study end or loss to follow-up were collected. A Cox proportional hazards model with HbA1c included as a time-dependent variable was fitted to these data. RESULTS Some 5368 people with newly diagnosed Type 1 diabetes were included. The estimated adjusted hazard ratio (aHR) for HbA1c was statistically significant [aHR 1.007; 95% confidence interval (CI) 1.002-1.011 (mmol/mol) and aHR 1.07; 95% CI 1.03-1.12 (%)]. An incremental higher risk of fracture was observed with increasing levels of HbA1c . CONCLUSIONS In people with newly diagnosed Type 1 diabetes, higher HbA1c is associated with an increased risk for fractures.
Collapse
Affiliation(s)
- R Thayakaran
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - M Perrins
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - K M Gokhale
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - S Kumaran
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| | - P Narendran
- Department of Diabetes, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- Institute of Immunology and Immunotherapy, Birmingham, UK
| | - M J Price
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and University of Birmingham, Birmingham, UK
| | - K Nirantharakumar
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
- Department of Diabetes, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- Centre for Endocrinology, Diabetes and Metabolism, University of Birmingham, Birmingham, UK
- Health Data Research UK Midlands, Birmingham, UK
| | - K A Toulis
- Institute of Applied Health Research, University of Birmingham, Birmingham, UK
| |
Collapse
|
31
|
Tiwari V, Nanda S, Mattoo B, Kumar U, Kumaran S, Bhatia R. Effect of rTMS therapy on pain descriptors and corticomotor excitability in fibromyalgia: a randomized control trial. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.620] [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: 10/27/2022] Open
|
32
|
Cawley A, Golding S, Goulsbra A, Hoptroff M, Kumaran S, Marriott R. Microbiology insights into boosting salivary defences through the use of enzymes and proteins. J Dent 2019; 80 Suppl 1:S19-S25. [DOI: 10.1016/j.jdent.2018.10.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/23/2018] [Accepted: 10/25/2018] [Indexed: 10/28/2022] Open
|
33
|
Affiliation(s)
- S. Rajiv
- Division of Nanotechnology, Department of Electronics and Communication EngineeringPeriyar Maniammai Institute of Science and Technology Thanjavur 613403 India
| | - S. Kumaran
- Department of BiotechnologyPeriyar Maniammai Institute of Science and Technology Thanjavur 613403 India
| | - M. Sathish
- Functional Materials Division, Central Electrochemical Research InstituteCouncil of Scientific and Industrial Research Karaikudi 630003 India
| |
Collapse
|
34
|
Ananthakumar K, Kumaran S. Experimental Investigation and Prediction of Optimum Process Parameter for Plasma Assisted Diffusion Bonding of Commercial Pure Titanium and Austenitic Stainless Steel. Arab J Sci Eng 2018. [DOI: 10.1007/s13369-018-3384-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
35
|
Kumaran S, Tamil Selvan K, Justin Paul G, Swaminathan N. Temporal profile of AV nodal conduction block recovery pattern in acute inferior wall myocardial infarction following thrombolysis. Indian Heart J 2017. [DOI: 10.1016/j.ihj.2017.09.033] [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: 11/28/2022] Open
|
36
|
Chopra S, Kumaran S, Sinha S, Kaur H, Nehra A. Using functional MRI to track neuroplasticity after cognitive rehabilitation post traumatic brain injury. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2670] [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: 10/18/2022]
|
37
|
Singh AK, Ekka MK, Kaushik A, Pandya V, Singh RP, Banerjee S, Mittal M, Singh V, Kumaran S. Substrate-Induced Facilitated Dissociation of the Competitive Inhibitor from the Active Site of O-Acetyl Serine Sulfhydrylase Reveals a Competitive-Allostery Mechanism. Biochemistry 2017; 56:5011-5025. [PMID: 28805060 DOI: 10.1021/acs.biochem.7b00500] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
By classical competitive antagonism, a substrate and competitive inhibitor must bind mutually exclusively to the active site. The competitive inhibition of O-acetyl serine sulfhydrylase (OASS) by the C-terminus of serine acetyltransferase (SAT) presents a paradox, because the C-terminus of SAT binds to the active site of OASS with an affinity that is 4-6 log-fold (104-106) greater than that of the substrate. Therefore, we employed multiple approaches to understand how the substrate gains access to the OASS active site under physiological conditions. Single-molecule and ensemble approaches showed that the active site-bound high-affinity competitive inhibitor is actively dissociated by the substrate, which is not consistent with classical views of competitive antagonism. We employed fast-flow kinetic approaches to demonstrate that substrate-mediated dissociation of full length SAT-OASS (cysteine regulatory complex) follows a noncanonical "facilitated dissociation" mechanism. To understand the mechanism by which the substrate induces inhibitor dissociation, we resolved the crystal structures of enzyme·inhibitor·substrate ternary complexes. Crystal structures reveal a competitive allosteric binding mechanism in which the substrate intrudes into the inhibitor-bound active site and disengages the inhibitor before occupying the site vacated by the inhibitor. In summary, here we reveal a new type of competitive allosteric binding mechanism by which one of the competitive antagonists facilitates the dissociation of the other. Together, our results indicate that "competitive allostery" is the general feature of noncanonical "facilitated/accelerated dissociation" mechanisms. Further understanding of the mechanistic framework of "competitive allosteric" mechanism may allow us to design a new family of "competitive allosteric drugs/small molecules" that will have improved selectivity and specificity as compared to their competitive and allosteric counterparts.
Collapse
Affiliation(s)
- Appu Kumar Singh
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Mary Krishna Ekka
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Abhishek Kaushik
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Vaibhav Pandya
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Ravi P Singh
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Shrijita Banerjee
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Monica Mittal
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - Vijay Singh
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| | - S Kumaran
- G. N. Ramachandran Protein Center, Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR) , Sector 39-A, Chandigarh, India 160036
| |
Collapse
|
38
|
Mittal M, Singh AK, Kumaran S. Structural and biochemical characterization of ligand recognition by CysB, the master regulator of sulfate metabolism. Biochimie 2017; 142:112-124. [PMID: 28838607 DOI: 10.1016/j.biochi.2017.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/17/2017] [Indexed: 10/19/2022]
Abstract
CysB, a member of LysR-type transcriptional regulators, up-regulates the expression of genes associated with sulfate metabolism and cysteine biosynthesis. CysB is activated under sulfur limiting conditions by O-acetylserine (OAS) and N-acetylserine (NAS), but the activation mechanism of CysB remain unknown. Here, we report four crystal structures of ligand binding domains of CysB (CysB-LBD) in apo form and in complex with sulfate, OAS, and NAS. Our results show that CysB has two distinct allosteric ligand binding sites; a sulfate and NAS specific site-1 and a second, NAS and OAS specific site-2. All three ligands bind through the induced-fit mechanism. Surprisingly, OAS remodels the site-1 by binding to site-2, suggesting that site-1 and site-2 are coupled allosterically. Using DNA binding and site-directed mutagenesis approach, we show that OAS enhances NAS mediated activation and mutation at site-1 has no effect on site-2 mediated OAS activation. Results indicate that inducer binding triggered signals from OAS-Specific site-2 are relayed to DBD through site-1. Together, results presented here suggest that induced-fit binding and allosteric coupling between two ligand binding sites and DBD underlie the key feature of CysB activation. Further, this study provides first structural glimpse into recognition of inducer ligands by CysB and provides a general framework to understand how LTTR family regulators respond to dual activators.
Collapse
Affiliation(s)
- Monica Mittal
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), G. N. Ramachandran Protein Center, Sector 39-A, Chandigarh, 160036, India
| | - Appu Kumar Singh
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), G. N. Ramachandran Protein Center, Sector 39-A, Chandigarh, 160036, India
| | - S Kumaran
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology (IMTECH), G. N. Ramachandran Protein Center, Sector 39-A, Chandigarh, 160036, India.
| |
Collapse
|
39
|
Babu P, Chittoria RK, Sudhanva HK, Kumaran S, Kumar ES. Radiofrequency-Assisted Body Piercing. J Cutan Aesthet Surg 2017; 10:231-233. [PMID: 29491662 PMCID: PMC5820844 DOI: 10.4103/jcas.jcas_79_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The art of body piercing is ancient; however, nowadays it has evolved into a fashion statement. In the Indian subcontinent, ear and nose piercing hold religious and cultural significance in addition to being done for aesthetic reasons. Body piercing is routinely performed by railroading technique or by piercing guns; many modifications of the technique have emerged. Irrespective of the technique used, the main complications associated are intraoperative bleeding and postoperative infection. To overcome these problems, we describe a novel and simple technique of ear and nose piercing using the radio frequency cautery.
Collapse
Affiliation(s)
- Preethitha Babu
- Department of Plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - Ravi K Chittoria
- Department of Plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - Hemant K Sudhanva
- Department of Plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - S Kumaran
- Department of Plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - Elan S Kumar
- Department of Plastic Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| |
Collapse
|
40
|
Singh S, Singh H, Tuknait A, Chaudhary K, Singh B, Kumaran S, Raghava GPS. PEPstrMOD: structure prediction of peptides containing natural, non-natural and modified residues. Biol Direct 2015; 10:73. [PMID: 26690490 PMCID: PMC4687368 DOI: 10.1186/s13062-015-0103-4] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 12/18/2015] [Indexed: 12/16/2022] Open
Abstract
Background In the past, many methods have been developed for peptide tertiary structure prediction but they are limited to peptides having natural amino acids. This study describes a method PEPstrMOD, which is an updated version of PEPstr, developed specifically for predicting the structure of peptides containing natural and non-natural/modified residues. Results PEPstrMOD integrates Forcefield_NCAA and Forcefield_PTM force field libraries to handle 147 non-natural residues and 32 types of post-translational modifications respectively by performing molecular dynamics using AMBER. AMBER was also used to handle other modifications like peptide cyclization, use of D-amino acids and capping of terminal residues. In addition, GROMACS was used to implement 210 non-natural side-chains in peptides using SwissSideChain force field library. We evaluated the performance of PEPstrMOD on three datasets generated from Protein Data Bank; i) ModPep dataset contains 501 non-natural peptides, ii) ModPep16, a subset of ModPep, and iii) CyclicPep contains 34 cyclic peptides. We achieved backbone Root Mean Square Deviation between the actual and predicted structure of peptides in the range of 3.81–4.05 Å. Conclusions In summary, the method PEPstrMOD has been developed that predicts the structure of modified peptide from the sequence/structure given as input. We validated the PEPstrMOD application using a dataset of peptides having non-natural/modified residues. PEPstrMOD offers unique advantages that allow the users to predict the structures of peptides having i) natural residues, ii) non-naturally modified residues, iii) terminal modifications, iv) post-translational modifications, v) D-amino acids, and also allows extended simulation of predicted peptides. This will help the researchers to have prior structural information of modified peptides to further design the peptides for desired therapeutic property. PEPstrMOD is freely available at http://osddlinux.osdd.net/raghava/pepstrmod/. Reviewers This article was reviewed by Prof Michael Gromiha, Dr. Bojan Zagrovic and Dr. Zoltan Gaspari. Electronic supplementary material The online version of this article (doi:10.1186/s13062-015-0103-4) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Sandeep Singh
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - Harinder Singh
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - Abhishek Tuknait
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - Kumardeep Chaudhary
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - Balvinder Singh
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - S Kumaran
- CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| | - Gajendra P S Raghava
- Bioinformatics Centre, CSIR-Institute of Microbial Technology, Sec 39-A, Chandigarh, 160036, India.
| |
Collapse
|
41
|
Singh AK, Singh M, Pandya VK, G L B, Singh V, Ekka MK, Mittal M, Kumaran S. Molecular basis of peptide recognition in metallopeptidase Dug1p from Saccharomyces cerevisiae. Biochemistry 2014; 53:7870-83. [PMID: 25427234 DOI: 10.1021/bi501263u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dug1p, a M20 family metallopeptidase and human orthologue of carnosinase, hydrolyzes Cys-Gly dipeptide, the last step of glutathione (GSH) degradation in Saccharomyces cerevisiae. Molecular bases of peptide recognition by Dug1p and other M20 family peptidases remain unclear in the absence of structural information about enzyme-peptide complexes. We report the crystal structure of Dug1p at 2.55 Å resolution in complex with a Gly-Cys dipeptide and two Zn(2+) ions. The dipeptide is trapped in the tunnel-like active site; its C-terminus is held by residues at the S1' binding pocket, whereas the S1 pocket coordinates Zn(2+) ions and the N-terminus of the peptide. Superposition with the carnosinase structure shows that peptide mimics the inhibitor bestatin, but active site features are altered upon peptide binding. The space occupied by the N-terminus of bestatin is left unoccupied in the Dug1p structure, suggesting that tripeptides could bind. Modeling of tripeptides into the Dug1p active site showed tripeptides fit well. Guided by the structure and modeling, we examined the ability of Dug1p to hydrolyze tripeptides, and results show that Dug1p hydrolyzes tripeptides selectively. Point mutations of catalytic residues do not abolish the peptide binding but abolish the hydrolytic activity, suggesting a noncooperative mode in peptide recognition. In summary, results reveal that peptides are recognized primarily through their amino and carboxyl termini, but hydrolysis depends on the properties of peptide substrates, dictated by their respective sequences. Structural similarity between the Dug1p-peptide complex and the bestatin-bound complex of CN2 suggests that the Dug1p-peptide structure can be used as a template for designing natural peptide inhibitors.
Collapse
Affiliation(s)
- Appu Kumar Singh
- G. N. Ramachandran Protein Centre, Institute of Microbial Technology, Council of Scientific and Industrial Research (CSIR) , Sector 39A, Chandigarh 160036, India
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Kumaran S, Ravi M, Meenakshi K, Muthukumar D, Swaminathan N, Ravishankar G, Justin Paul G, Manohar G, Murugan S. Pattern of arrhythmias following PTMC – An insight into patient and procedure related factors. Indian Heart J 2014. [DOI: 10.1016/j.ihj.2014.10.388] [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: 11/30/2022] Open
|
43
|
Kumaran S, Ravi M, Meenakshi K, Muthukumar D, Swaminathan N, Ravishankar G, Justin Paul G, Manohar G, Murugan S, Vengatesan S. Differential pattern of commissural split and it's impact on mitral valve orifice following PTMC. Indian Heart J 2014. [DOI: 10.1016/j.ihj.2014.10.284] [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: 10/24/2022] Open
|
44
|
Manjula K, Rajendran K, Eevera T, Kumaran S. QUANTITATIVE ESTIMATION OF LUPEOL AND STIGMASTEROL IN COSTUS IGNEUS BY HIGH-PERFORMANCE THIN-LAYER CHROMATOGRAPHY. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2011.647196] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- K. Manjula
- a Department of Biotechnology , Periyar Maniammai University , Tamilnadu , India
| | - K. Rajendran
- a Department of Biotechnology , Periyar Maniammai University , Tamilnadu , India
| | - T. Eevera
- b Dryland Agricultural Research Station , Tamil Nadu Agriculture University , Tamil Nadu , India
| | - S. Kumaran
- a Department of Biotechnology , Periyar Maniammai University , Tamilnadu , India
| |
Collapse
|
45
|
Sakthivel M, Deivasigamani B, Alagappan KM, Kumaran S, Balamurugan S, Rajasekar T. Seasonal changes in selected immune response of Mystus gulio and Mystus vittatus. J Environ Biol 2013; 34:37-42. [PMID: 24006805] [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: 06/02/2023]
Abstract
Estuaries are considered as highly potential area for that including feeding, spawning and nursery rearing of most of the finfishes and shellfishes. In the present investigation, two species of catfish (M. gulio and M. vittatus) were selected to study the impact of season on their immune organs (kidney and spleen) and selected immune response from Vellar estuary. The physico-chemical parameters (pH, temperature, salinity and rainfall) were measured during the sampling period 2009-10. The non-specific immune parameters (WBC count, lysozyme activity and NBT assay) were analyzed. The immune organs (head-kidney and spleen) variation was also observed by histological studies. Our results stated that the WBCs count of M. gulio and M. vittatus increased during summer (10.3 and 10.1 x 10(6) ml(-1)) season and decreased in monsoon (6.8 and 7.0 x 10(6) ml(-1)). In contrast, lysozyme activity was highest in post monsoon (1540 and 1525 U min(-1) ml(-1)) and lowest in summer (1000 and 960 U min(-1) ml(-1)). The activity of NBT was highest in monsoon (0.68 and 0.65 at 540 nm) and lowest in summer (0.012 and 0.2 at 540 nm). The histological observation implies that the cell variations were different in respect to different seasons.
Collapse
Affiliation(s)
- M Sakthivel
- Faculty of Marine Sciences, Annamalai University, Parangipettai-608 502, India
| | | | | | | | | | | |
Collapse
|
46
|
Biswas D, Pandya V, Singh AK, Mondal AK, Kumaran S. Co-factor binding confers substrate specificity to xylose reductase from Debaryomyces hansenii. PLoS One 2012; 7:e45525. [PMID: 23049810 PMCID: PMC3458928 DOI: 10.1371/journal.pone.0045525] [Citation(s) in RCA: 13] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 08/21/2012] [Indexed: 01/07/2023] Open
Abstract
Binding of substrates into the active site, often through complementarity of shapes and charges, is central to the specificity of an enzyme. In many cases, substrate binding induces conformational changes in the active site, promoting specific interactions between them. In contrast, non-substrates either fail to bind or do not induce the requisite conformational changes upon binding and thus no catalysis occurs. In principle, both lock and key and induced-fit binding can provide specific interactions between the substrate and the enzyme. In this study, we present an interesting case where cofactor binding pre-tunes the active site geometry to recognize only the cognate substrates. We illustrate this principle by studying the substrate binding and kinetic properties of Xylose Reductase from Debaryomyces hansenii (DhXR), an AKR family enzyme which catalyzes the reduction of carbonyl substrates using NADPH as co-factor. DhXR reduces D-xylose with increased specificity and shows no activity towards "non-substrate" sugars like L-rhamnose. Interestingly, apo-DhXR binds to D-xylose and L-rhamnose with similar affinity (K(d)∼5.0-10.0 mM). Crystal structure of apo-DhXR-rhamnose complex shows that L-rhamnose is bound to the active site cavity. L-rhamnose does not bind to holo-DhXR complex and thus, it cannot competitively inhibit D-xylose binding and catalysis even at 4-5 fold molar excess. Comparison of K(d) values with K(m) values reveals that increased specificity for D-xylose is achieved at the cost of moderately reduced affinity. The present work reveals a latent regulatory role for cofactor binding which was previously unknown and suggests that cofactor induced conformational changes may increase the complimentarity between D-xylose and active site similar to specificity achieved through induced-fit mechanism.
Collapse
Affiliation(s)
- Dipanwita Biswas
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
| | - Vaibhav Pandya
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
| | - Appu Kumar Singh
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
| | - Alok K. Mondal
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
| | - S. Kumaran
- Council of Scientific and Industrial Research (CSIR), Institute of Microbial Technology, Chandigarh, India
- * E-mail:
| |
Collapse
|
47
|
Rajasekar T, Balaji S, Kumaran S, Deivasigamani B, Pugzhavendhan S. Isolation and characterization of Marine fungal metabolites against clinical pathogens. Asian Pacific Journal of Tropical Disease 2012. [DOI: 10.1016/s2222-1808(12)60187-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
48
|
|
49
|
Kumaran S, Palani P, Nishanthi R, Srimathi S, Kaviyarasan V. Purification of an Intracellular Fibrinolytic Protease from Ganoderma Lucidum Vk12 and its Susceptibility to Different Enzyme Inhibitors. TROP J PHARM RES 2011. [DOI: 10.4314/tjpr.v10i4.6] [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: 11/17/2022] Open
|
50
|
Pandya V, Ekka MK, Dutta RK, Kumaran S. Mass spectrometry assay for studying kinetic properties of dipeptidases: characterization of human and yeast dipeptidases. Anal Biochem 2011; 418:134-42. [PMID: 21771575 DOI: 10.1016/j.ab.2011.06.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 06/20/2011] [Accepted: 06/21/2011] [Indexed: 10/18/2022]
Abstract
Chemical modifications of substrate peptides are often necessary to monitor the hydrolysis of small bioactive peptides. We developed an electrospray ionization mass spectrometry (ESI-MS) assay for studying substrate distributions in reaction mixtures and determined steady-state kinetic parameters, the Michaelis-Menten constant (K(m)), and catalytic turnover rate (V(max)/[E](t)) for three metallodipeptidases: two carnosinases (CN1 and CN2) from human and Dug1p from yeast. The turnover rate (V(max)/[E](t)) of CN1 and CN2 determined at pH 8.0 (112.3 and 19.5s(-1), respectively) suggested that CN1 is approximately 6-fold more efficient. The turnover rate of Dug1p for Cys-Gly dipeptide at pH 8.0 was found to be slightly lower (73.8s(-1)). In addition, we determined kinetic parameters of CN2 at pH 9.2 and found that the turnover rate was increased by 4-fold with no significant change in the K(m). Kinetic parameters obtained by the ESI-MS method are consistent with results of a reverse-phase high-performance liquid chromatography (RP-HPLC)-based assay. Furthermore, we used tandem MS (MS/MS) analyses to characterize carnosine and measured its levels in CHO cell lines in a time-dependent manner. The ESI-MS method developed here obviates the need for substrate modification and provides a less laborious, accurate, and rapid assay for studying kinetic properties of dipeptidases in vitro as well as in vivo.
Collapse
Affiliation(s)
- Vaibhav Pandya
- Council of Scientific and Industrial Research, Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
| | | | | | | |
Collapse
|