1
|
Tehami M, Imam HT, Abdullah I, Hosford J, Wong XJ, Rahman NA, Wong LS. Biocatalytic Generation of o-Quinone Imines in the Synthesis of 1,4-Benzoxazines and Its Comparative Green Chemistry Metrics. ACS Sustain Chem Eng 2024; 12:2678-2685. [PMID: 38389905 PMCID: PMC10880089 DOI: 10.1021/acssuschemeng.3c06758] [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] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 01/09/2024] [Accepted: 01/10/2024] [Indexed: 02/24/2024]
Abstract
1,4-Benzoxazines are important motifs in many pharmaceuticals and can be formed by a reaction sequence involving the oxidation of o-aminophenols to their corresponding quinone imine followed by an in situ inverse electron demand Diels-Alder (IEDDA) cycloaddition with a suitable dienophile. Reported herein is the development of a reaction sequence that employs horseradish peroxidase to catalyze the oxidation of the aminophenols prior to the IEDDA as a more sustainable alternative to the use of conventional stoichiometric oxidants. The synthesis of 10 example benzoxazines is demonstrated in this "one-pot, two-step" procedure with yields between 42% and 92%. The green chemistry metrics, including the E-factor and generalized reaction mass efficiency, for this biocatalytic reaction were compared against the conventional chemical approach. It was found that the reported biocatalytic route was approximately twice as green by these measures.
Collapse
Affiliation(s)
- Maryam Tehami
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess Street, M1 7DN Manchester, United Kingdom
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
| | - Hasan Tanvir Imam
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess Street, M1 7DN Manchester, United Kingdom
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
| | - Iskandar Abdullah
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess Street, M1 7DN Manchester, United Kingdom
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
- Department
of Chemistry, Faculty of Science, Universiti
Malaya, 50603 Kuala Lumpur, Malaysia
| | - Joseph Hosford
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess Street, M1 7DN Manchester, United Kingdom
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
| | - Xiao Juie Wong
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
| | | | - Lu Shin Wong
- Manchester
Institute of Biotechnology, University of
Manchester, 131 Princess Street, M1 7DN Manchester, United Kingdom
- Department
of Chemistry, University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom
| |
Collapse
|
2
|
Lim YW, Tan WS, Ho KL, Mariatulqabtiah AR, Abu Kasim NH, Abd. Rahman N, Wong TW, Chee CF. Challenges and Complications of Poly(lactic- co-glycolic acid)-Based Long-Acting Drug Product Development. Pharmaceutics 2022; 14:614. [PMID: 35335988 PMCID: PMC8955085 DOI: 10.3390/pharmaceutics14030614] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 02/19/2022] [Indexed: 12/13/2022] Open
Abstract
Poly(lactic-co-glycolic acid) (PLGA) is one of the preferred polymeric inactive ingredients for long-acting parenteral drug products that are constituted of complex formulations. Despite over 30 years of use, there are still many challenges faced by researchers in formulation-related aspects pertaining to drug loading and release. Until now, PLGA-based complex generic drug products have not been successfully developed. The complexity in developing these generic drug products is not just due to their complex formulation, but also to the manufacturing process of the listed reference drugs that involve PLGA. The composition and product attributes of commercial PLGA formulations vary with the drugs and their intended applications. The lack of standard compendial methods for in vitro release studies hinders generic pharmaceutical companies in their efforts to develop PLGA-based complex generic drug products. In this review, we discuss the challenges faced in developing PLGA-based long-acting injectable/implantable (LAI) drug products; hurdles that are associated with drug loading and release that are dictated by the physicochemical properties of PLGA and product manufacturing processes. Approaches to overcome these challenges and hurdles are highlighted specifically with respect to drug encapsulation and release.
Collapse
Affiliation(s)
- Yi Wen Lim
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia; (Y.W.L.); (W.S.T.)
| | - Wen Siang Tan
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia; (Y.W.L.); (W.S.T.)
- Laboratory of Vaccines and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia;
| | - Kok Lian Ho
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia;
| | - Abdul Razak Mariatulqabtiah
- Laboratory of Vaccines and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia;
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia
| | - Noor Hayaty Abu Kasim
- Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur 50300, Malaysia;
| | | | - Tin Wui Wong
- Non-Destructive Biomedical and Pharmaceutical Research Centre, Smart Manufacturing Research Institute, Universiti Teknologi MARA, Puncak Alam 42300, Malaysia
| | - Chin Fei Chee
- Nanotechnology and Catalysis Research Centre, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| |
Collapse
|
3
|
Rajaratnam V, Ng H, Rahman NA, Dong C. Development of a mental script for the mental practice of micro suturing: a methodological approach. Ann R Coll Surg Engl 2021; 104:288-294. [PMID: 34931536 DOI: 10.1308/rcsann.2021.0171] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Motor imagery and mental practice are important for the acquisition and mastery of surgical skills. The success of this technique relies on the use of a well-developed mental script. In this study, we shared how we developed a mental script for basic micro suturing training by using a low-fidelity rubber glove model. METHODS This study applied the design and development research framework. Five expert surgeons developed a mental script by performing a cognitive walkthrough to repair a vertical opening in a rubber glove model, followed by hierarchical task analysis. A draft script was created, and its face and content validity assessed with a checking-back process. Twenty-eight surgeons used the Mental Imagery Questionnaire (MIQ) to assess the validity of the final script. RESULTS The process of developing the mental script is detailed. The assessment by the expert panel showed the mental script had good face and content validity. The mean overall MIQ score was 5.2±1.1 (standard deviation), demonstrating the validity of generating mental imagery from the mental script developed in this study for micro suturing in the rubber glove model. CONCLUSION The methodological approach described in this study is based on a design and development research framework to teach surgical skills. This model is inexpensive and easily accessible, addressing the challenges of reduced opportunities to practise surgical skills. However, although motor skills are important, the surgeon's other non-technical expertise is not addressed with this model. Thus, this model should act as one surgical training approach, but not replace it.
Collapse
Affiliation(s)
| | - Hjh Ng
- Khoo Teck Puat Hospital, Singapore
| | | | - C Dong
- Sengkang General Hospital, Singapore
| |
Collapse
|
4
|
Rajaratnam V, Rahman NA, Dong C. Integrating instructional design principles into surgical skills training models: an innovative approach. Ann R Coll Surg Engl 2021; 103:718-724. [PMID: 34719953 DOI: 10.1308/rcsann.2020.7132] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE Surgical training programmes are evolving from time-based to competency-based schedules, which define expected learning outcomes in surgical knowledge, clinical and technical skills according to training levels. This article aims to review current models in surgical skills acquisition and to propose an integrative process-driven, outcomes-based model for surgical skills acquisition and mastery. DESIGN A literature review was conducted on the theories of motor skills acquisition using PubMed, Web of Science and Google Scholar from 2010 to February 2020. The review was limited to theories and models on surgical skills acquisition and mastery. Four models of surgical skills acquisition were included: Fitts and Posner's three-stage model of motor skills acquisition, Bandura's social learning theory, Ericsson's deliberate practice model and Jeannerod's motor simulation theory. These models are deficient in that there is no universally accessible opportunity to practise the surgical procedure outside of the operating theatre and without access to physical simulators. RESULTS We propose an innovative model that allows deliberate practice of the procedure without the need for expensive physical simulators, and provides an on-demand, self-directed practice by the trainees to achieve the level of mastery. This new model, which incorporates motor imagery and mental practice, augmented by deliberate practice, will provide an alternative training path for expert performance in surgical procedures. CONCLUSIONS The innovative model provides a solution to the reduced opportunity for practice by surgical trainees to achieve mastery in surgical motor skills.
Collapse
Affiliation(s)
| | | | - C Dong
- Sengkang General Hospital, Singapore
| |
Collapse
|
5
|
Keng FSL, Phang SM, Abd Rahman N, Yeong HY, Malin G, Leedham Elvidge E, Sturges W. Halocarbon emissions by selected tropical seaweeds exposed to different temperatures. Phytochemistry 2021; 190:112869. [PMID: 34274551 DOI: 10.1016/j.phytochem.2021.112869] [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] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 06/30/2021] [Accepted: 07/02/2021] [Indexed: 06/13/2023]
Abstract
Four tropical seaweeds, Gracilaria manilaensis Yamamoto & Trono, Ulva reticulata Forsskål, Kappaphycus alvarezii (Doty) L.M.Liao and Turbinaria conoides (J.Agardh) Kützing, collected from various habitats throughout Malaysia, were subjected to temperatures of 40, 35, 30, 25 and 20 °C in the laboratory. An exposure range of 21-38 °C is reported for Malaysian waters. The effect of the temperature exposures on the halocarbon emissions of the seaweeds were determined 4 and 28 h after treatment. The emission rates for a suite of six halocarbons commonly emitted by seaweeds, bromoform (CHBr3), dibromomethane (CH2Br2), diiodomethane (CH2I2), iodomethane (CH3I), dibromochloromethane (CHBr2Cl) and dichlorobromomethane (CHBrCl2), were measured using a cryogenic purge-and-trap sample preparation system coupled to a gas chromatography-mass spectrometry. The emission rate of CHBr3 was the highest of the six halocarbons for all the seaweeds under all the temperatures tested, followed by CH2Br2, and CH2I2. The emission rates were affected by temperature change and exposure duration, but overall responses were unique to each seaweed species. Larger decreases in the emissions of CHBr3, CH2Br2, CH2I2 and CHBr2Cl were found for K. alvarezii and T. conoides after 4 h at 40 °C. In both cases there was a >90% (p < 0.05) reduction in the Fv/Fm value suggesting that photosynthetic actitivity was severely compromised. After a 28 h exposure period, strong negative correlations (r = -0.69 to -0.95; p < 0.01) were observed between temperature and the emission of CHBr3, CH2Br2 and CH2I2 for U. reticulata, K. alvarezii and T. conoides. This suggests a potential decrease in the halocarbon emissions from these tropical seaweeds, especially where the temperature increase is a prolonged event. Strong correlations were also seen between seaweed chlorophyll and carotenoid pigment contents and the emission rates for CHBr3, CH2Br2 and CH2I2 (r = 0.48 to 0.96 and -0.49 to -0.96; p < 0.05). These results suggest that the regulation of halocarbon production versus reactive oxygen species production in seaweeds is an area worthy of further exploration.
Collapse
Affiliation(s)
- Fiona Seh-Lin Keng
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603, Kuala Lumpur, Malaysia; Institute for Advanced Studies, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Siew-Moi Phang
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603, Kuala Lumpur, Malaysia; Faculty of Applied Sciences, UCSI University, Cheras, 56000, Kuala Lumpur, Malaysia.
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Hui-Yin Yeong
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Gill Malin
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, United Kingdom
| | - Emma Leedham Elvidge
- Faculty of Science, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, United Kingdom
| | - William Sturges
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, United Kingdom
| |
Collapse
|
6
|
Al-Thiabat MG, Gazzali AM, Mohtar N, Murugaiyah V, Kamarulzaman EE, Yap BK, Rahman NA, Othman R, Wahab HA. Conjugated β-Cyclodextrin Enhances the Affinity of Folic Acid towards FRα: Molecular Dynamics Study. Molecules 2021; 26:5304. [PMID: 34500740 PMCID: PMC8434473 DOI: 10.3390/molecules26175304] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 07/16/2021] [Revised: 08/13/2021] [Accepted: 08/16/2021] [Indexed: 12/02/2022] Open
Abstract
Drug targeting is a progressive area of research with folate receptor alpha (FRα) receiving significant attention as a biological marker in cancer drug delivery. The binding affinity of folic acid (FA) to the FRα active site provides a basis for recognition of FRα. In this study, FA was conjugated to beta-cyclodextrin (βCD) and subjected to in silico analysis (molecular docking and molecular dynamics (MD) simulation (100 ns)) to investigate the affinity and stability for the conjugated system compared to unconjugated and apo systems (ligand free). Docking studies revealed that the conjugated FA bound into the active site of FRα with a docking score (free binding energy < -15 kcal/mol), with a similar binding pose to that of unconjugated FA. Subsequent analyses from molecular dynamics (MD) simulations, root mean square deviation (RMSD), root mean square fluctuation (RMSF), and radius of gyration (Rg) demonstrated that FA and FA-βCDs created more dynamically stable systems with FRα than the apo-FRα system. All systems reached equilibrium with stable RMSD values ranging from 1.9-2.4 Å and the average residual fluctuation values of the FRα backbone atoms for all residues (except for terminal residues ARG8, THR9, THR214, and LEU215) were less than 2.1 Å with a consistent Rg value of around 16.8 Å throughout the MD simulation time (0-100 ns). The conjugation with βCD improved the stability and decreased the mobility of all the residues (except residues 149-151) compared to FA-FRα and apo-FRα systems. Further analysis of H-bonds, binding free energy (MM-PBSA), and per residue decomposition energy revealed that besides APS81, residues HIS20, TRP102, HIS135, TRP138, TRP140, and TRP171 were shown to have more favourable energy contributions in the holo systems than in the apo-FRα system, and these residues might have a direct role in increasing the stability of holo systems.
Collapse
Affiliation(s)
- Mohammad G. Al-Thiabat
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
- Pharmaceutical Design and Simulation (PHDS) Laboratory, School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia
| | - Amirah Mohd Gazzali
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
| | - Noratiqah Mohtar
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
| | - Vikneswaran Murugaiyah
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
| | - Ezatul Ezleen Kamarulzaman
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
| | - Beow Keat Yap
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia;
| | - Rozana Othman
- Center for Natural Products Research and Drug Discovery (CENAR), Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Habibah A. Wahab
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia; (M.G.A.-T.); (A.M.G.); (N.M.); (V.M.); (E.E.K.); (B.K.Y.)
- Pharmaceutical Design and Simulation (PHDS) Laboratory, School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town 11800, Malaysia
| |
Collapse
|
7
|
Gautam V, Nimmanpipug P, Zain SM, Rahman NA, Lee VS. Molecular Dynamics Simulations in Designing DARPins as Phosphorylation-Specific Protein Binders of ERK2. Molecules 2021; 26:molecules26154540. [PMID: 34361694 PMCID: PMC8347146 DOI: 10.3390/molecules26154540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 07/20/2021] [Accepted: 07/23/2021] [Indexed: 11/16/2022] Open
Abstract
Extracellular signal-regulated kinases 1 and 2 (ERK1/2) play key roles in promoting cell survival and proliferation through the phosphorylation of various substrates. Remarkable antitumour activity is found in many inhibitors that act upstream of the ERK pathway. However, drug-resistant tumour cells invariably emerge after their use due to the reactivation of ERK1/2 signalling. ERK1/2 inhibitors have shown clinical efficacy as a therapeutic strategy for the treatment of tumours with mitogen-activated protein kinase (MAPK) upstream target mutations. These inhibitors may be used as a possible strategy to overcome acquired resistance to MAPK inhibitors. Here, we report a class of repeat proteins-designed ankyrin repeat protein (DARPin) macromolecules targeting ERK2 as inhibitors. The structural basis of ERK2-DARPin interactions based on molecular dynamics (MD) simulations was studied. The information was then used to predict stabilizing mutations employing a web-based algorithm, MAESTRO. To evaluate whether these design strategies were successfully deployed, we performed all-atom, explicit-solvent molecular dynamics (MD) simulations. Two mutations, Ala → Asp and Ser → Leu, were found to perform better than the original sequence (DARPin E40) based on the associated energy and key residues involved in protein-protein interaction. MD simulations and analysis of the data obtained on these mutations supported our predictions.
Collapse
Affiliation(s)
- Vertika Gautam
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; (V.G.); (S.M.Z.); (N.A.R.)
| | - Piyarat Nimmanpipug
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Center of Excellence for Innovation in Analytical Science and Technology (I-ANALY-S-T), Chiang Mai University, Chiang Mai 50200, Thailand
| | - Sharifuddin Md Zain
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; (V.G.); (S.M.Z.); (N.A.R.)
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; (V.G.); (S.M.Z.); (N.A.R.)
| | - Vannajan Sanghiran Lee
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; (V.G.); (S.M.Z.); (N.A.R.)
- Center of Excellence for Innovation in Analytical Science and Technology (I-ANALY-S-T), Chiang Mai University, Chiang Mai 50200, Thailand
- Correspondence:
| |
Collapse
|
8
|
Sukumaran SD, Nasir SB, Tee JT, Buckle MJC, Othman R, Rahman NA, Lee VS, Bukhari SNA, Chee CF. Analogues of 2'-hydroxychalcone with modified C4-substituents as the inhibitors against human acetylcholinesterase. J Enzyme Inhib Med Chem 2021; 36:130-137. [PMID: 33243025 PMCID: PMC7822063 DOI: 10.1080/14756366.2020.1847100] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A series of C4-substituted tertiary nitrogen-bearing 2′-hydroxychalcones were designed and synthesised based on a previous mixed type acetylcholinesterase inhibitor. Majority of the 2′-hydroxychalcone analogues displayed a better inhibition against acetylcholinesterase (AChE) than butyrylcholinesterase (BuChE). Among them, compound 4c was identified as the most potent AChE inhibitor (IC50: 3.3 µM) and showed the highest selectivity for AChE over BuChE (ratio >30:1). Molecular docking studies suggested that compound 4c interacts with both the peripheral anionic site (PAS) and catalytic anionic site (CAS) regions of AChE. ADMET analysis confirmed the therapeutic potential of compound 4c based on its blood–brain barrier penetrating. Overall, the results suggest that this 2′-hydroxychalcone deserves further investigation into the therapeutic lead for Alzheimer’s disease (AD).
Collapse
Affiliation(s)
- Sri Devi Sukumaran
- Faculty of Medicine, Department of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
| | - Shah Bakhtiar Nasir
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Jia Ti Tee
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Michael J C Buckle
- Faculty of Medicine, Department of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
| | - Rozana Othman
- Faculty of Medicine, Department of Pharmacy, University of Malaya, Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Vannajan Sanghiran Lee
- Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Chin Fei Chee
- Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
9
|
Lani R, Agharbaoui FE, Hassandarvish P, Teoh BT, Sam SS, Zandi K, Rahman NA, AbuBakar S. In silico studies of fisetin and silymarin as novel chikungunya virus nonstructural proteins inhibitors. Future Virol 2021. [DOI: 10.2217/fvl-2019-0090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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
Aim: Chikungunya virus (CHIKV) infection is often characterized by fever, rash and arthralgia. Until now, there is no vaccine or antiviral drug available for this disease. Two flavonoid compounds, silymarin and fisetin, were reported to be able to inhibit CHIKV replication. Materials & methods: The interaction between the flavonoid compounds and two CHIKV nonstructural proteins (nsP2 and nsP3) were investigated through molecular docking supported with other analysis such as molecular dynamics simulation and binding free energy calculation. Results: The compounds establish potent, stable and flexible interaction with the binding pocket of the two target proteins. Conclusion: The outcomes of this study support the previously published experimental data on anti-CHIKV activity of the compounds by highlighting the interactions with the proteins’ key residues.
Collapse
Affiliation(s)
- Rafidah Lani
- Department of Medical Microbiology, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | | | - Pouya Hassandarvish
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Boon Teong Teoh
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Sing Sin Sam
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Keivan Zandi
- Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University, Atlanta, GA 30322, USA
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Sazaly AbuBakar
- Tropical Infectious Diseases Research & Education Centre (TIDREC), Universiti Malaya, Kuala Lumpur 50603, Malaysia
| |
Collapse
|
10
|
Arumugam AC, Agharbaoui FE, Khazali AS, Yusof R, Abd Rahman N, Ahmad Fuaad AAH. Computational-aided design: minimal peptide sequence to block dengue virus transmission into cells. J Biomol Struct Dyn 2020; 40:5026-5035. [PMID: 33382015 DOI: 10.1080/07391102.2020.1866074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Dengue virus (DV) infection is one of the main public health concerns, affecting approximately 390 million people worldwide, as reported by the World Health Organization. Yet, there is no antiviral treatment for DV infection. Therefore, the development of potent and nontoxic anti-DV, as a complement for the existing treatment strategies, is urgently needed. Herein, we investigate a series of small peptides inhibitors of DV antiviral activity targeting the entry process as the promising strategy to block DV infection. The peptides were designed based on our previously reported peptide sequence, DN58opt (TWWCFYFCRRHHPFWFFYRHN), to identify minimal effective inhibitory sequence through molecular docking and dynamics studies. The in silico designed peptides were synthesized using conventional Fmoc solid-phase peptide synthesis chemistry, purified by RP-HPLC and characterized using LCMS. Later, they were screened for their antiviral activity. One of the peptides, AC 001, was able to reduce about 40% of DV plaque formation. This observation correlates well with the molecular mechanics-Poisson-Boltzmann surface area (MM-PBSA) analysis - AC 001 showed the most favorable binding affinity through 60 ns simulations. Pairwise residue decomposition analysis has revealed four key residues that contributed to the binding of these peptides into the DV2 E protein pocket. This work identifies the minimal peptide sequence required to inhibit DV replication and explains the behavior observed on an atomic level using computational study.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Aathe Cangaree Arumugam
- Faculty of Science, Department of Chemistry, DDDRG, Universiti Malaya, Kuala Lumpur, Malaysia
| | | | - Ahmad Suhail Khazali
- Faculty of Medicine, Department of Molecular Medicine, Universiti Malaya, Kuala Lumpur, Malaysia.,Faculty of Applied Sciences, Universiti Teknologi Mara, Arau, Perlis, Malaysia
| | - Rohana Yusof
- Faculty of Medicine, Department of Molecular Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Faculty of Science, Department of Chemistry, DDDRG, Universiti Malaya, Kuala Lumpur, Malaysia
| | | |
Collapse
|
11
|
Rasul RM, Tamilarasi Muniandy M, Zakaria Z, Shah K, Chee CF, Dabbagh A, Rahman NA, Wong TW. A review on chitosan and its development as pulmonary particulate anti-infective and anti-cancer drug carriers. Carbohydr Polym 2020; 250:116800. [PMID: 33049807 PMCID: PMC7434482 DOI: 10.1016/j.carbpol.2020.116800] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/17/2020] [Accepted: 07/19/2020] [Indexed: 12/24/2022]
Abstract
Chitosan, as a biodegradable and biocompatible polymer, is characterized by anti-microbial and anti-cancer properties. It lately has received a widespread interest for use as the pulmonary particulate backbone materials of drug carrier for the treatment of infectious disease and cancer. The success of chitosan as pulmonary particulate drug carrier is a critical interplay of their mucoadhesive, permeation enhancement and site/cell-specific attributes. In the case of nanocarriers, various microencapsulation and micro-nano blending systems have been devised to equip them with an appropriate aerodynamic character to enable efficient pulmonary aerosolization and inhalation. The late COVID-19 infection is met with acute respiratory distress syndrome and cancer. Chitosan and its derivatives are found useful in combating HCoV and cancer as a function of their molecular weight, substituent type and its degree of substitution. The interest in chitosan is expected to rise in the next decade from the perspectives of drug delivery in combination with its therapeutic performance.
Collapse
Affiliation(s)
- Ruhisy Mohd Rasul
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, 42300, Puncak Alam, Selangor, Malaysia; Faculty of Applied Sciences, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - M Tamilarasi Muniandy
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, 42300, Puncak Alam, Selangor, Malaysia; Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Zabliza Zakaria
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, 42300, Puncak Alam, Selangor, Malaysia; Particle Design Research Group, Faculty of Pharmacy, Universiti Teknologi MARA Selangor, Puncak Alam, Selangor, Malaysia
| | - Kifayatullah Shah
- Department of Pharmaceutics, Faculty of Pharmacy, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa, Pakistan
| | - Chin Fei Chee
- Nanotechnology & Catalysis Research Centre, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Ali Dabbagh
- School of Medicine, Faculty of Health and Medical Sciences, Taylor's University, Subang Jaya, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Tin Wui Wong
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, 42300, Puncak Alam, Selangor, Malaysia; Particle Design Research Group, Faculty of Pharmacy, Universiti Teknologi MARA Selangor, Puncak Alam, Selangor, Malaysia; Sino-Malaysia Molecular Oncology and Traditional Chinese Medicine Delivery Joint Research Centre, Medical College, Yangzhou University. China.
| |
Collapse
|
12
|
Meesala R, Lee YK, Arshad ASM, Abdullah I, Mordi MN, Abd Rahman N. CuBr-Catalyzed One-Pot Three-Component Synthesis of Novel 2-(Carbazolyl)benzothiazoles. Synlett 2020. [DOI: 10.1055/s-0040-1706477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractA facile synthesis of various 2-(carbazolyl)benzothiazoles has been developed by one-pot CuBr-catalyzed three-component reactions of 2-iodoanilines, arylaldehydes, and elemental sulfur. Unlike traditional approach, this reaction exhibited a good functional group tolerance to produce the corresponding 2-(carbazolyl)benzothiazoles in good yields in the absence of any additive.
Collapse
Affiliation(s)
- Ramu Meesala
- Drug Design and Development Research Group, Department of Chemistry, Faculty of Science, Universiti Malaya
| | - Yean Kee Lee
- Drug Design and Development Research Group, Department of Chemistry, Faculty of Science, Universiti Malaya
| | | | - Iskandar Abdullah
- Drug Design and Development Research Group, Department of Chemistry, Faculty of Science, Universiti Malaya
| | | | - Noorsaadah Abd Rahman
- Drug Design and Development Research Group, Department of Chemistry, Faculty of Science, Universiti Malaya
| |
Collapse
|
13
|
Sampath U. Gunathilake TM, Ching YC, Chuah CH, Rahman NA, Nai-Shang L. pH-responsive poly(lactic acid)/sodium carboxymethyl cellulose film for enhanced delivery of curcumin in vitro. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101787] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
14
|
Sampath Udeni Gunathilake TM, Ching YC, Chuah CH, Rahman NA, Liou NS. Recent advances in celluloses and their hybrids for stimuli-responsive drug delivery. Int J Biol Macromol 2020; 158:670-688. [PMID: 32389655 DOI: 10.1016/j.ijbiomac.2020.05.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 12/24/2019] [Revised: 04/28/2020] [Accepted: 05/01/2020] [Indexed: 02/07/2023]
Abstract
The limitations of existing drug delivery systems (DDS) such as non-specific bio-distribution and poor selectivity have led to the exploration of a variety of carrier platforms to facilitate highly desirable and efficient drug delivery. Stimuli-responsive DDS are one of the most versatile and innovative approach to steer the compounds to the intended sites by exploiting their responsiveness to a range of various triggers. Preparation of stimuli-responsive DDS using celluloses and their derivatives offer a remarkable advantage over conventional polymer materials. In this review, we highlight on state-of-art progress in developing cellulose/cellulose hybrid stimuli-responsive DDS, which covers the preparation techniques, physicochemical properties, basic principles and, mechanisms of stimuli effect on drug release from various types of cellulose based carriers, through recent innovative investigations. Attention has been paid to endogenous stimuli (pH, temperature, redox gradient and ionic-strength) responsive DDS and exogenous stimuli (light, magnetic field and electric field) responsive DDS, where the cellulose-based materials have been extensively employed. Furthermore, the current challenges and future prospects of these DDS are also discussed at the end.
Collapse
Affiliation(s)
- Thennakoon M Sampath Udeni Gunathilake
- Advanced Materials Center, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Yern Chee Ching
- Advanced Materials Center, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Cheng Hock Chuah
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Biochemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Nai-Shang Liou
- Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, 710 Tainan City, Taiwan, ROC
| |
Collapse
|
15
|
Liew YJM, Lee YK, Khalid N, Rahman NA, Tan BC. Enhancing flavonoid production by promiscuous activity of prenyltransferase, BrPT2 from Boesenbergia rotunda. PeerJ 2020; 8:e9094. [PMID: 32391211 PMCID: PMC7197402 DOI: 10.7717/peerj.9094] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 12/26/2019] [Accepted: 04/09/2020] [Indexed: 11/20/2022] Open
Abstract
Flavonoids and prenylated flavonoids are active components in medicinal plant extracts which exhibit beneficial effects on human health. Prenylated flavonoids consist of a flavonoid core with a prenyl group attached to it. This prenylation process is catalyzed by prenyltranferases (PTs). At present, only a few flavonoid-related PT genes have been identified. In this study, we aimed to investigate the roles of PT in flavonoid production. We isolated a putative PT gene (designated as BrPT2) from a medicinal ginger, Boesenbergia rotunda. The deduced protein sequence shared highest gene sequence homology (81%) with the predicted homogentisate phytyltransferase 2 chloroplastic isoform X1 from Musa acuminata subsp. Malaccensis. We then cloned the BrPT2 into pRI vector and expressed in B. rotunda cell suspension cultures via Agrobacterium-mediated transformation. The BrPT2-expressing cells were fed with substrate, pinostrobin chalcone, and their products were analyzed by liquid chromatography mass spectrometry. We found that the amount of flavonoids, namely alpinetin, pinostrobin, naringenin and pinocembrin, in BrPT2-expressing cells was higher than those obtained from the wild type cells. However, we were unable to detect any targeted prenylated flavonoids. Further in-vitro assay revealed that the reaction containing the BrPT2 protein produced the highest accumulation of pinostrobin from the substrate pinostrobin chalcone compared to the reaction without BrPT2 protein, suggesting that BrPT2 was able to accelerate the enzymatic reaction. The finding of this study implied that the isolated BrPT2 may not be involved in the prenylation of pinostrobin chalcone but resulted in high yield and production of other flavonoids, which is likely related to enzyme promiscuous activities.
Collapse
Affiliation(s)
- Yvonne Jing Mei Liew
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Yean Kee Lee
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Norzulaani Khalid
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.,Center for Research in Biotechnology for Agriculture, University of Malaya, Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Boon Chin Tan
- Center for Research in Biotechnology for Agriculture, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
16
|
Zdainal Abidin SN, Lee HV, Asikin-Mijan N, Juan JC, Rahman NA, Mastuli MS, Taufiq-Yap YH, Kong PS. Ni, Zn and Fe hydrotalcite-like catalysts for catalytic biomass compound into green biofuel. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-0820] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractIn this study, the deoxygenation pathway was proposed to eliminate oxygen species from biomass-derived oil, thereby producing a high quality of hydrocarbon chains (green fuel). The catalytic deoxygenation reaction of bio-oil model compound (oleic acid) successfully produced green gasoline (C8–C12) and diesel (C13–C20) via activated hydrotalcite-derived catalysts (i.e. CMgAl, CFeAl, CZnAl and CNiAl). The reaction was performed under inert N2 condition at 300 °C for 3 h, and the liquid products were analysed by GC–MS and GC–FID analyses to determine the hydrocarbon yield and product selectivity. The activity of the catalysts towards the deoxygenation reaction presented the following increasing order: CNiAl > CMgAl > CZnAl > CFeAl. CNiAl produced a hydrocarbon yield of up to 89 %. CNiAl demonstrated the highest selectivity with 83 % diesel production, whereas CMgAl showed the highest gasoline selectivity with 30 %. These results indicated that catalysts with a high acidic profile facilitate C–O cleavage via deoxygenation, producing hydrocarbons (mainly diesel-range hydrocarbons). Meanwhile, highly basic catalysts exhibit significant selectivity towards gasoline-range hydrocarbons via cracking and lead to the occurrence of C–C cleavage. The large surface area of CNiAl (117 m2 g−1) offered high approachability of the reactant with the catalyst’s active sites, thereby promoting high hydrocarbon yield. Consequently, the hydrocarbon yield and selectivity of the deoxygenation products were predominantly influenced by the acid–base properties and structural behaviour (porosity and surface area) of the catalyst.
Collapse
Affiliation(s)
- Shajaratun Nur Zdainal Abidin
- Nanotechnology and Catalysis Research Centre (Nanocat), Institute of Advanced Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Hwei Voon Lee
- Nanotechnology and Catalysis Research Centre (Nanocat), Institute of Advanced Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Nurul Asikin-Mijan
- Nanotechnology and Catalysis Research Centre (Nanocat), Institute of Advanced Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Catalysis Science and Technology Research Centre (PutraCAT), Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Joon Ching Juan
- Nanotechnology and Catalysis Research Centre (Nanocat), Institute of Advanced Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Mohd Sufri Mastuli
- Centre for Nanomaterials Research, Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
- School of Chemistry and Environment, Faculty of Applied Science, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
| | - Yun Hin Taufiq-Yap
- Catalysis Science and Technology Research Centre (PutraCAT), Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
- Chancellery Office, Universiti Malaysia Sabah, 88400 Kota Kinabalu,Sabah, Malaysia
| | - Pei San Kong
- Sime Darby Research, R&D Centre – Carey Island, Lot 2664 Jalan Pulau Carey, 42960 Pulau Carey, Selangor, Malaysia
| |
Collapse
|
17
|
Lee VS, Chong WL, Sukumaran SD, Nimmanpipug P, Letchumanan V, Goh BH, Lee LH, Md. Zain S, Abd Rahman N. Computational screening and identifying binding interaction of anti-viral and anti-malarial drugs: Toward the potential cure for SARS-CoV-2. ACTA ACUST UNITED AC 2020. [DOI: 10.36877/pddbs.a0000065] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Since the emergence of 2019 novel coronavirus (also known as SARS-CoV-2) to date, effective treatment for the patients was reported to be some anti-viral for flu and HIV-1 or anti-malaria drugs. To understand the finer details of the molecular interactions and complexation between these proteinase inhibitors and the COVID-19, virus sequence analysis in comparison to SARS coronavirus and molecular docking were carried out. Results showedfavourable binding for the current treatment of drugs and 7 additional possible effective drugs, DB06290 (Simeprevir, Hepatitis C drug), DB09183 (Dasabuvir, Hepatitis C drug), DB01232 (Saquinavir, HIV-1 drug), DB00254 (Doxycycline, Malaria drug), DB01117 (Atovaquone, Malaria drug), DB04835(Maraviroc, HIV-1 drug), DB08930 (Dolutegravir, Hepatitis C drug) with good binding affinities towards COVID-19 in the range of -8.7 to -8.0 kcal/mol. Analysis of the interaction residues of the docked complex was mapped in a 2D diagram to explain the interaction with the proteinase binding pocket. Repurposed drugs from our recommendation may help battle the new coronavirus and subject for additional examination.
Collapse
|
18
|
Roslan NB, Huy TS, Kee LY, Abd Rahman N, Mohamed Z. ANALYSES OF BOESENBERGIA ROTUNDA CELL SUSPENSION CULTURES WITH OVEREXPRESSED CHALCONE SYNTHASE (CHS) MANIFESTING CHANGES ON THE EXPRESSION LEVEL OF FLAVONOID-RELATED GENES. MJS 2020; 39:15-29. [DOI: 10.22452/mjs.vol39no1.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
19
|
Niemelä E, Desai D, Niemi R, Doroszko M, Özliseli E, Kemppainen K, Rahman NA, Sahlgren C, Törnquist K, Eriksson JE, Rosenholm JM. Nanoparticles carrying fingolimod and methotrexate enables targeted induction of apoptosis and immobilization of invasive thyroid cancer. Eur J Pharm Biopharm 2020; 148:1-9. [PMID: 31917332 DOI: 10.1016/j.ejpb.2019.12.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [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: 08/02/2019] [Revised: 11/29/2019] [Accepted: 12/30/2019] [Indexed: 02/08/2023]
Abstract
Metastatic tumors are the main cause of cancer-related death, as the invading cancer cells disrupt normal functions of distant organs and are nearly impossible to eradicate by traditional cancer therapeutics. This is of special concern when the cancer has created multiple metastases and extensive surgery would be too dangerous to execute. Therefore, combination chemotherapy is often the selected treatment form. However, drug cocktails often have severe adverse effects on healthy cells, whereby the development of targeted drug delivery could minimize side-effects of drugs and increase the efficacy of the combination therapy. In this study, we utilized the folate antagonist methotrexate (MTX) as targeting ligand conjugated onto mesoporous silica nanoparticles (MSNs) for selective eradication of folate receptor-expressing invasive thyroid cancer cells. The MSNs was subsequently loaded with the drug fingolimod (FTY720), which has previously been shown to efficiently inhibit proliferation and invasion of aggressive thyroid cancer cells. To assess the efficiency of our carrier system, comprehensive in vitro methods were employed; including flow cytometry, confocal microscopy, viability assays, invasion assay, and label-free imaging techniques. The in vitro results show that MTX-conjugated and FTY720-loaded MSNs potently attenuated both the proliferation and invasion of the cancerous thyroid cells while keeping the off-target effects in normal thyroid cells reasonably low. For a more physiologically relevant in vivo approach we utilized the chick chorioallantoic membrane (CAM) assay, showing decreased invasive behavior of the thyroid derived xenografts and an increased necrotic phenotype compared to tumors that received the free drug cocktail. Thus, the developed multidrug-loaded MSNs effectively induced apoptosis and immobilization of invasive thyroid cancer cells, and could potentially be used as a carrier system for targeted drug delivery for the treatment of diverse forms of aggressive cancers that expresses folate receptors.
Collapse
Affiliation(s)
- E Niemelä
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland; Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland
| | - D Desai
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - R Niemi
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - M Doroszko
- Institute of Biomedicine, University of Turku, Finland; Department of Immunology, Genetics and Pathology, Section for Neuro-oncology, Uppsala University, Sweden
| | - E Özliseli
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - K Kemppainen
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - N A Rahman
- Institute of Biomedicine, University of Turku, Finland; Department of Reproduction and Gynecological Endocrinology, Medical University of Bialystok, Poland
| | - C Sahlgren
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland; Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland; Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - K Törnquist
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland; Minerva Foundation Institute for Medical Research, Biomedicum, Helsinki, Finland
| | - J E Eriksson
- Cell Biology, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland; Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland.
| | - J M Rosenholm
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland.
| |
Collapse
|
20
|
|
21
|
Ahmad MH, Rahman NA, Kadir FA, Al-Ani LA, Hashim NM, Yehye WA. Design and synthesis of sulfur-containing butylated hydroxytoluene: antioxidant potency and selective anticancer agent. J CHEM SCI 2019. [DOI: 10.1007/s12039-019-1682-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
22
|
Lim YK, Keng FSL, Phang SM, Sturges WT, Malin G, Abd Rahman N. Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae. PeerJ 2019; 7:e6758. [PMID: 31041152 PMCID: PMC6476285 DOI: 10.7717/peerj.6758] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 09/11/2018] [Accepted: 03/09/2019] [Indexed: 11/20/2022] Open
Abstract
Marine algae have been reported as important sources of biogenic volatile halocarbons that are emitted into the atmosphere. These compounds are linked to destruction of the ozone layer, thus contributing to climate change. There may be mutual interactions between the halocarbon emission and the environment. In this study, the effect of irradiance on the emission of halocarbons from selected microalgae was investigated. Using controlled laboratory experiments, three tropical marine microalgae cultures, Synechococcus sp. UMACC 371 (cyanophyte), Parachlorella sp. UMACC 245 (chlorophyte) and Amphora sp. UMACC 370 (diatom) were exposed to irradiance of 0, 40 and 120 µmol photons m-2s-1. Stress in the microalgal cultures was indicated by the photosynthetic performance (Fv/Fm, maximum quantum yield). An increase in halocarbon emissions was observed at 120 µmol photons m-2s-1, together with a decrease in Fv/Fm. This was most evident in the release of CH3I by Amphora sp. Synechococcus sp. was observed to be the most affected by irradiance as shown by the increase in emissions of most halocarbons except for CHBr3 and CHBr2Cl. High positive correlation between Fv/Fm and halocarbon emission rates was observed in Synechococcus sp. for CH2Br2. No clear trends in correlation could be observed for the other halocarbons in the other two microalgal species. This suggests that other mechanisms like mitochondria respiration may contribute to halocarbon production, in addition to photosynthetic performance.
Collapse
Affiliation(s)
- Yong-Kian Lim
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia.,Institute of Graduate Studies (IPS), University of Malaya, Kuala Lumpur, Malaysia.,The Swire Institute of Marine Science and School of Biological Sciences, University of Hong Kong, Hong Kong, SAR
| | - Fiona Seh-Lin Keng
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia.,Institute of Graduate Studies (IPS), University of Malaya, Kuala Lumpur, Malaysia
| | - Siew-Moi Phang
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia.,Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - William T Sturges
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
| | - Gill Malin
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
23
|
Karim HAA, Rungrotmongkol T, Zain SM, Rahman NA, Tayapiwattana C, Lee V. Designed antiviral ankyrin – A computational approach to combat HIV-1 via intracellular pathway by targeting the viral capsid of HIV-1. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
24
|
Hariono M, Choi SB, Roslim RF, Nawi MS, Tan ML, Kamarulzaman EE, Mohamed N, Yusof R, Othman S, Abd Rahman N, Othman R, Wahab HA. Thioguanine-based DENV-2 NS2B/NS3 protease inhibitors: Virtual screening, synthesis, biological evaluation and molecular modelling. PLoS One 2019; 14:e0210869. [PMID: 30677071 PMCID: PMC6345492 DOI: 10.1371/journal.pone.0210869] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 01/03/2019] [Indexed: 12/25/2022] Open
Abstract
Dengue virus Type 2 (DENV-2) is predominant serotype causing major dengue epidemics. There are a number of studies carried out to find its effective antiviral, however to date, there is still no molecule either from peptide or small molecules released as a drug. The present study aims to identify small molecules inhibitor from National Cancer Institute database through virtual screening. One of the hits, D0713 (IC50 = 62 μM) bearing thioguanine scaffold was derivatised into 21 compounds and evaluated for DENV-2 NS2B/NS3 protease inhibitory activity. Compounds 18 and 21 demonstrated the most potent activity with IC50 of 0.38 μM and 16 μM, respectively. Molecular dynamics and MM/PBSA free energy of binding calculation were conducted to study the interaction mechanism of these compounds with the protease. The free energy of binding of 18 calculated by MM/PBSA is -16.10 kcal/mol compared to the known inhibitor, panduratin A (-11.27 kcal/mol), which corroborates well with the experimental observation. Results from molecular dynamics simulations also showed that both 18 and 21 bind in the active site and stabilised by the formation of hydrogen bonds with Asn174.
Collapse
Affiliation(s)
- Maywan Hariono
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
- Faculty of Pharmacy, Sanata Dharma University, Maguwoharjo, Sleman, Yogyakarta, Indonesia
| | - Sy Bing Choi
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
- School of Data Sciences, Perdana University, Blok B and d1, MARDI Complex, Jalan MAEPS Perdana, Serdang, Selangor
| | - Ros Fatihah Roslim
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
| | - Mohamed Sufian Nawi
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
- Department of Pharmaceutical Chemistry, Kulliyah of Pharmacy, International Islamic University Malaysia, Kuantan, Pahang, Malaysia
| | - Mei Lan Tan
- Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Pulau Pinang, Malaysia
| | | | - Nornisah Mohamed
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
| | - Rohana Yusof
- Department of Molecular Medicine, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Shatrah Othman
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Rozana Othman
- Department of Pharmacy, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Habibah A. Wahab
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia
- Malaysian Institute of Pharmaceuticals and Nutraceuticals, Ministry of Science, Technology and Innovation, Halaman Bukit Gambir, Bayan Lepas, Pulau Pinang, Malaysia
- * E-mail: ,
| |
Collapse
|
25
|
Isa DM, Chin SP, Chong WL, Zain SM, Rahman NA, Lee VS. Dynamics and binding interactions of peptide inhibitors of dengue virus entry. J Biol Phys 2019; 45:63-76. [PMID: 30680580 DOI: 10.1007/s10867-018-9515-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 05/16/2018] [Accepted: 11/28/2018] [Indexed: 01/01/2023] Open
Abstract
In this study, we investigate the binding interactions of two synthetic antiviral peptides (DET2 and DET4) on type II dengue virus (DENV2) envelope protein domain III. These two antiviral peptides are designed based on the domain III of the DENV2 envelope protein, which has shown significant inhibition activity in previous studies and can be potentially modified further to be active against all dengue strains. Molecular docking was performed using AutoDock Vina and the best-ranked peptide-domain III complex was further explored using molecular dynamics simulations. Molecular mechanics-Poisson-Boltzmann surface area (MM-PBSA) was used to calculate the relative binding free energies and to locate the key residues of peptide-protein interactions. The predicted binding affinity correlated well with the previous experimental studies. DET4 outperformed DET2 and is oriented within the binding site through favorable vdW and electrostatic interactions. Pairwise residue decomposition analysis has revealed several key residues that contribute to the binding of these peptides. Residues in DET2 interact relatively lesser with the domain III compared to DET4. Dynamic cross-correlation analysis showed that both the DET2 and DET4 trigger different dynamic patterns on the domain III. Correlated motions were seen between the residue pairs of DET4 and the binding site while binding of DET2 results in anti-correlated motion on the binding site. This work showcases the use of computational study in elucidating and explaining the experiment observation on an atomic level.
Collapse
Affiliation(s)
- Diyana Mohd Isa
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Sek Peng Chin
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Wei Lim Chong
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Sharifuddin M Zain
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Vannajan Sanghiran Lee
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
| |
Collapse
|
26
|
Nath AR, Chee CF, Rahman NA. Application of Electrochemical Cross-Dehydrogenative Couplings in the Syntheses of Heterocycles. Heterocycles via Cross Dehydrogenative Coupling 2019:445-494. [DOI: 10.1007/978-981-13-9144-6_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
27
|
Zdainal Abidin SN, Lee HV, Juan JC, Rahman NA, Taufiq-Yap YH. Production of green biofuel by using a goat manure supported Ni–Al hydrotalcite catalysed deoxygenation process. RSC Adv 2019; 9:1642-1652. [PMID: 35518010 PMCID: PMC9059750 DOI: 10.1039/c8ra07818a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 09/20/2018] [Accepted: 12/16/2018] [Indexed: 11/22/2022] Open
Abstract
The high oxygen content in natural biomass resources, such as vegetable oil or biomass-pyrolysed bio oil, is the main constraint in their implementation as a full-scale biofuel for the automotive industry. In the present study, renewable fuel with petrodiesel-like properties was produced via catalytic deoxygenation of oleic acid in the absence of hydrogen (H2). The deoxygenation pathway of oleic acid to bio-hydrocarbon involves decarboxylation/decarbonylation of the oxygen content from the fatty acid structure in the form of carbon dioxide (CO2)/carbon monoxide (CO), with the presence of a goat manure supported Ni–Al hydrotalcite (Gm/Ni–Al) catalyst. Goat manure is an abundant bio-waste, containing a high mineral content, urea as well as cellulosic fiber of plants, which is potentially converted into activated carbon. Synthesis of Gm/Ni–Al was carried out by incorporation of pre-activated goat manure (GmA) during co-precipitation of Ni–Al catalyst with 1 : 3, 1 : 1 and 3 : 1 ratios. The physico-chemical properties of the catalysts were characterized by X-ray diffractometry (XRD), Brunauer–Emmet–Teller (BET) surface area, field emission surface electron microscopy (FESEM) and temperature program desorption ammonia (TPD-NH3) analysers. The catalytic deoxygenation reaction was performed in a batch reactor and the product obtained was characterized by using gas chromatography-mass spectroscopy (GCMS) for compound composition identification as well as gas chromatography-flame ionisation detector (GC-FID) for yield and selectivity determination. The optimization and evaluation were executed using response surface methodology (RSM) in conjunction with central composite design (CCD) with 5-level-3-factors. From the RSM reaction model, it was found that the Gm/Ni–Al 1 : 1 catalysed deoxygenation reaction gives the optimum product yield of 97.9% of hydrocarbon in the range of C8–C20, with diesel selectivity (C17: heptadecane and heptadecene compounds) of 63.7% at the optimal reaction conditions of: (1) reaction temperature: 327.14 °C, (2) reaction time: 1 h, and (3) catalyst amount: 5 wt%. Deoxygenation pathway of oleic acid to bio-hydrocarbon involves decarboxylation/decarbonylation of oxygen content from fatty acid structure in the form of carbon dioxide (CO2)/carbon monoxide (CO), respectively, with the presence of goat manure supported Ni–Al hydrotalcite (Gm/Ni–Al) catalyst.![]()
Collapse
Affiliation(s)
- Shajaratun Nur Zdainal Abidin
- Nanotechnology & Catalysis Research Centre (Nanocat)
- Institute of Advance Studies
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Hwei Voon Lee
- Nanotechnology & Catalysis Research Centre (Nanocat)
- Institute of Advance Studies
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Joon Ching Juan
- Nanotechnology & Catalysis Research Centre (Nanocat)
- Institute of Advance Studies
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Yun Hin Taufiq-Yap
- Catalysis Science & Technology Research Centre (PutraCAT)
- Faculty of Science
- Universiti Putra Malaysia
- Malaysia
| |
Collapse
|
28
|
Alhajj N, Chee CF, Wong TW, Rahman NA, Abu Kasim NH, Colombo P. Lung cancer: active therapeutic targeting and inhalational nanoproduct design. Expert Opin Drug Deliv 2018; 15:1223-1247. [DOI: 10.1080/17425247.2018.1547280] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Nasser Alhajj
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, Puncak Alam, Malaysia
| | - Chin Fei Chee
- Nanotechnology & Catalysis Research Centre, University of Malaya, Kuala Lumpur, Malaysia
| | - Tin Wui Wong
- Non-Destructive Biomedical and Pharmaceutical Research Centre, iPROMISE, Universiti Teknologi MARA Selangor, Puncak Alam, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Noor Hayaty Abu Kasim
- Wellness Research Cluster, Institute of Research Management & Monitoring, University of Malaya, Kuala Lumpur, Malaysia
| | - Paolo Colombo
- Dipartimento di Farmacia, Università degli Studi di Parma, Parma, Italy
| |
Collapse
|
29
|
Heng HL, Chee CF, Thy CK, Tee JT, Chin SP, Herr DR, Buckle MJC, Paterson IC, Doughty SW, Abd Rahman N, Chung LY. In vitro functional evaluation of isolaureline, dicentrine and glaucine enantiomers at 5-HT 2 and α 1 receptors. Chem Biol Drug Des 2018; 93:132-138. [PMID: 30216681 DOI: 10.1111/cbdd.13390] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 06/04/2018] [Revised: 08/26/2018] [Accepted: 09/02/2018] [Indexed: 10/28/2022]
Abstract
Compounds with activity at serotonin (5-hydroxytryptamine) 5-HT2 and α1 adrenergic receptors have potential for the treatment of central nervous system disorders, drug addiction or overdose. Isolaureline, dicentrine and glaucine enantiomers were synthesized, and their in vitro functional activities at human 5-HT2 and adrenergic α1 receptor subtypes were evaluated. The enantiomers of isolaureline and dicentrine acted as antagonists at 5-HT2 and α1 receptors with (R)-isolaureline showing the greatest potency (pKb = 8.14 at the 5-HT2C receptor). Both (R)- and (S)-glaucine also antagonized α1 receptors, but they behaved very differently to the other compounds at 5-HT2 receptors: (S)-glaucine acted as a partial agonist at all three 5-HT2 receptor subtypes, whereas (R)-glaucine appeared to act as a positive allosteric modulator at the 5-HT2A receptor.
Collapse
Affiliation(s)
- Hui Li Heng
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Chin Fei Chee
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.,Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Chun Keng Thy
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Jia Ti Tee
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.,Department of Oral Biology and Craniofacial Sciences and Oral Cancer Research and Coordinating Centre, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Sek Peng Chin
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.,Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Deron R Herr
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Michael J C Buckle
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Ian C Paterson
- Department of Oral Biology and Craniofacial Sciences and Oral Cancer Research and Coordinating Centre, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Lip Yong Chung
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
30
|
Paiman MES, Hamzah NS, Idris SS, Rahman NA, Ismail K. Synergistic Effect of Co-utilization of Coal and Biomass Char: An Overview. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/358/1/012003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
31
|
Abstract
Background:
The Diels-Alder reaction has been widely utilised in the syntheses of biologically important
natural products over the years and continues to greatly impact modern synthetic methodology. Recent
discovery of chiral organocatalysts, auxiliaries and ligands in organic synthesis has paved the way for their application
in Diels-Alder chemistry with the goal to improve efficiency as well as stereochemistry.
Objective:
The review focuses on asymmetric syntheses of flavonoid Diels-Alder natural products that utilize
chiral ligand-Lewis acid complexes through various illustrative examples.
Conclusion:
It is clear from the review that a significant amount of research has been done investigating
various types of catalysts and chiral ligand-Lewis acid complexes for the enantioselective synthesis of flavonoid
Diels-Alder natural products. The results have demonstrated improved yield and enantioselectivity. Much
emphasis has been placed on the synthesis but important mechanistic work aimed at understanding the
enantioselectivity has also been discussed.
Collapse
Affiliation(s)
- Shah Bakhtiar Nasir
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Chin Fei Chee
- Nanotechnology & Catalysis Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
32
|
Chan PQ, Lee YK, Rahman NA. Facile Intramolecular Cyclization of N-(2-Hydroxybenzoyl)hydrazones to N, N′-Diacetyl Benzo-1,3,4-oxadiazepine Derivatives. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pei Qie Chan
- Drug Design and Development Research Group; Department of Chemistry; Faculty of Science; University of Malaya; 50603 Kuala Lumpur Malaysia
| | - Yean Kee Lee
- Drug Design and Development Research Group; Department of Chemistry; Faculty of Science; University of Malaya; 50603 Kuala Lumpur Malaysia
| | - Noorsaadah Abd. Rahman
- Drug Design and Development Research Group; Department of Chemistry; Faculty of Science; University of Malaya; 50603 Kuala Lumpur Malaysia
| |
Collapse
|
33
|
Heng HL, Chee CF, Chin SP, Ouyang Y, Wang H, Buckle MJC, Herr DR, Paterson IC, Doughty SW, Abd Rahman N, Chung LY. Synthesis and evaluation of nuciferine and roemerine enantiomers as 5-HT 2 and α 1 receptor antagonists. Medchemcomm 2018; 9:576-582. [PMID: 30108948 PMCID: PMC6072365 DOI: 10.1039/c7md00629b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 02/09/2018] [Indexed: 11/21/2022]
Abstract
In this study, the (S)-enantiomers of the aporphine alkaloids, nuciferine and roemerine, were prepared via a synthetic route involving catalytic asymmetric hydrogenation and both stereoisomers were evaluated in vitro for functional activity at human 5-HT2 and adrenergic α1 receptor subtypes using a transforming growth factor-α shedding assay. Both enantiomers of each of the compounds were found to act as antagonists at 5-HT2 and α1 receptors. (R)-roemerine was the most potent compound at 5-HT2A and 5-HT2C receptors (pKb = 7.8-7.9) with good selectivity compared to (S)-roemerine at these two receptors and compared to its activity at 5-HT2B, α1A, α1B and α1D receptors.
Collapse
Affiliation(s)
- Hui Li Heng
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| | - Chin Fei Chee
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
- Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Sek Peng Chin
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
- Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Yifan Ouyang
- School of Pharmacy , Ningxia Medical University , Yinchuan , 750004 , P. R. China
| | - Hao Wang
- School of Pharmacy , Ningxia Medical University , Yinchuan , 750004 , P. R. China
| | - Michael J C Buckle
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| | - Deron R Herr
- Department of Pharmacology , Yong Loo Lin School of Medicine , National University of Singapore , 117597 Singapore
| | - Ian C Paterson
- Department of Oral Biology and Craniofacial Sciences and Oral Cancer Research and Coordinating Centre , Faculty of Dentistry , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Stephen W Doughty
- Penang Medical College , 4 Jalan Sepoy Lines , 10450 George Town , Pulau Pinang , Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Lip Yong Chung
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| |
Collapse
|
34
|
Heng HL, Chee CF, Chin SP, Ouyang Y, Wang H, Buckle MJC, Herr DR, Paterson IC, Doughty SW, Abd Rahman N, Chung LY. Correction: Synthesis and evaluation of nuciferine and roemerine enantiomers as 5-HT 2 and α 1 receptor antagonists. Medchemcomm 2018; 9:593-594. [PMID: 30288212 PMCID: PMC6144813 DOI: 10.1039/c8md90012d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 03/01/2018] [Indexed: 11/21/2022]
Abstract
[This corrects the article DOI: 10.1039/C7MD00629B.].
Collapse
Affiliation(s)
- Hui Li Heng
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| | - Chin Fei Chee
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959.,Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Sek Peng Chin
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959.,Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Yifan Ouyang
- School of Pharmacy , Ningxia Medical University , Yinchuan , 750004 , P. R. China
| | - Hao Wang
- School of Pharmacy , Ningxia Medical University , Yinchuan , 750004 , P. R. China
| | - Michael J C Buckle
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| | - Deron R Herr
- Department of Pharmacology , Yong Loo Lin School of Medicine , National University of Singapore , 117597 , Singapore
| | - Ian C Paterson
- Department of Oral Biology and Craniofacial Sciences and Oral Cancer Research and Coordinating Centre , Faculty of Dentistry , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Stephen W Doughty
- Penang Medical College , 4 Jalan Sepoy Lines , 10450 George Town , Pulau Pinang , Malaysia
| | - Noorsaadah Abd Rahman
- Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Lip Yong Chung
- Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . ; ; ; Tel: +60 3 79674959
| |
Collapse
|
35
|
Kong C, Chee CF, Richter K, Thomas N, Abd Rahman N, Nathan S. Suppression of Staphylococcus aureus biofilm formation and virulence by a benzimidazole derivative, UM-C162. Sci Rep 2018; 8:2758. [PMID: 29426873 PMCID: PMC5807447 DOI: 10.1038/s41598-018-21141-2] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [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: 11/17/2017] [Accepted: 01/30/2018] [Indexed: 12/11/2022] Open
Abstract
Staphylococcus aureus is a major cause of nosocomial infections and secretes a diverse spectrum of virulence determinants as well as forms biofilm. The emergence of antibiotic-resistant S. aureus highlights the need for alternative forms of therapeutics other than conventional antibiotics. One route to meet this need is screening small molecule derivatives for potential anti-infective activity. Using a previously optimized C. elegans – S. aureus small molecule screen, we identified a benzimidazole derivative, UM-C162, which rescued nematodes from a S. aureus infection. UM-C162 prevented the formation of biofilm in a dose-dependent manner without interfering with bacterial viability. To examine the effect of UM-C162 on the expression of S. aureus virulence genes, a genome-wide transcriptome analysis was performed on UM-C162-treated pathogen. Our data indicated that the genes associated with biofilm formation, particularly those involved in bacterial attachment, were suppressed in UM-C162-treated bacteria. Additionally, a set of genes encoding vital S. aureus virulence factors were also down-regulated in the presence of UM-C162. Further biochemical analysis validated that UM-C162-mediated disruption of S. aureus hemolysins, proteases and clumping factors production. Collectively, our findings propose that UM-C162 is a promising compound that can be further developed as an anti-virulence agent to control S. aureus infections.
Collapse
Affiliation(s)
- Cin Kong
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi Selangor, Malaysia.,Department of Biomedical Sciences, Faculty of Science, University of Nottingham Malaysia Campus, 43500, Semenyih, Selangor, Malaysia
| | - Chin-Fei Chee
- Nanotechnology & Catalysis Research Centre, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Katharina Richter
- Department of Surgery, Basil Hetzel Institute for Translational Health Research, The University of Adelaide, Adelaide, South Australia, Australia.,Adelaide Biofilm Test Facility, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia
| | - Nicky Thomas
- Adelaide Biofilm Test Facility, Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia.,School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
| | - Noorsaadah Abd Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Sheila Nathan
- School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi Selangor, Malaysia.
| |
Collapse
|
36
|
Sakirolla R, Tadiparthi K, Yaeghoobi M, Rahman NA. Di-cationic Ionic Liquid Catalyzed Synthesis of 1,5-Benzothiazepines. Asian J Chem 2018; 30:107-115. [DOI: 10.14233/ajchem.2018.20920] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
37
|
Shamsul NS, Kamarudin SK, Rahman NA. Study on the physical and chemical composition of agro wastes for the production of 5-hydroxymethylfurfural. Bioresour Technol 2018; 247:821-828. [PMID: 30060418 DOI: 10.1016/j.biortech.2017.09.140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 09/19/2017] [Accepted: 09/20/2017] [Indexed: 06/08/2023]
Abstract
Treated sludge, goat manure, sugarcane bagasse, empty fruit bunches of oil palm (EFBP) and dry leaves are agro wastes that have high potential for use as feedstocks for the production of 5-hydroxymethylfurfural (5-HMF). The focus of this study is to investigate the production of 5-HMF from agro wastes via co-hydrothermal (CHT) treatment and extraction. Present study include examine on agro waste's physical and chemical properties and also their thermal degradation behaviour. The analysis of the bio-oil products is conducted by FTIR and GC-MS. Co-hydrothermal experiments were conducted at a temperature of 300°C with an experimental time of 15min, followed by alcohol extraction. Highest carbon and hydrogen content are 45.94% and 6.49% (dry leaves) with maximum high heating value 18.39MJ/kg (dry leaves) and fix carbon value 6.60 (goat manure). Through CHT about 39% 5-HMF, 22.97% carboxylic acids, 0.97% of aromatic and 0.73% aldehyde obtained.
Collapse
Affiliation(s)
- N S Shamsul
- Department of Chemical and Process, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
| | - S K Kamarudin
- Department of Chemical and Process, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia; Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia.
| | - N A Rahman
- Department of Chemical and Process, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
| |
Collapse
|
38
|
Othman R, Othman R, Baharuddin A, Ramakrishnan NR, Abd Rahman N, Yusof R, Karsani SA. Molecular Docking Studies of Selected Medicinal Drugs as Dengue Virus-2 Protease Inhibitors. SAINS MALAYS 2017. [DOI: 10.17576/jsm-2017-4610-25] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
39
|
Nasir SB, Tee JT, Rahman NA, Chee CF. Biosynthesis and Biomimetic Synthesis of Flavonoid Diels-Alder Natural Products. Flavonoids - From Biosynthesis to Human Health 2017. [DOI: 10.5772/intechopen.68781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
40
|
Bujang NB, Chee CF, Heh CH, Rahman NA, Buckle MJC. Phosphodiesterase-5 inhibitors and their analogues as adulterants of herbal and food products: analysis of the Malaysian market, 2014-16. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017; 34:1101-1109. [PMID: 28580889 DOI: 10.1080/19440049.2017.1336674] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Adulteration of herbal health supplements with phosphodiesterase-5 (PDE-5) inhibitors and their analogues is becoming a worldwide problem. The aim of this study was to investigate herbal and food products sold in the Malaysian market for the presence of these adulterants. Sixty-two products that claim to enhance men's sexual health were sampled between April 2014 and April 2016. These products included unregistered products seized by the Pharmacy Enforcement Division of the Ministry of Health (n = 39), products sent to the National Pharmaceutical Regulatory Agency for pre-registration testing (n = 9) and products investigated under the post-registration market surveillance programme (n = 14). The products were tested against an in-house spectral library consisting of 61 PDE-5 inhibitors and analogues using a validated liquid chromatography-mass spectrometry ion-trap-time-of-flight (LC-MS IT-TOF) method. Thirty-two (82%) of the unregistered products and two (14%) of the registered products were found to be adulterated with at least one PDE-5 inhibitor or analogue, while none of the pre-registration products contained adulterants. A total of 16 different adulterants were detected and 36% of the adulterated products contained a mixture of two or more adulterants. This study has demonstrated that the adulteration of unregistered herbal products in the Malaysian market is an alarming issue that needs to be urgently addressed by the relevant authorities.
Collapse
Affiliation(s)
- Nur Baizura Bujang
- a Department of Pharmacy, Faculty of Medicine , University of Malaya , Kuala Lumpur , Malaysia.,b National Pharmaceutical Regulatory Agency , Lot 36 Jalan Universiti , Petaling Jaya , Malaysia
| | - Chin Fei Chee
- a Department of Pharmacy, Faculty of Medicine , University of Malaya , Kuala Lumpur , Malaysia.,c Department of Chemistry, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia
| | - Choon Han Heh
- a Department of Pharmacy, Faculty of Medicine , University of Malaya , Kuala Lumpur , Malaysia
| | - Noorsaadah Abd Rahman
- c Department of Chemistry, Faculty of Science , University of Malaya , Kuala Lumpur , Malaysia
| | - Michael J C Buckle
- a Department of Pharmacy, Faculty of Medicine , University of Malaya , Kuala Lumpur , Malaysia
| |
Collapse
|
41
|
Gan CS, Lee YK, Heh CH, Rahman NA, Yusof R, Othman S. The synthetic molecules YK51 and YK73 attenuate replication of dengue virus serotype 2. Trop Biomed 2017; 34:270-283. [PMID: 33593007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Dengue virus infection has been posing alarming economic and social burden on affected nations. It is estimated that 50-100 million dengue infections occur annually with over 2.5 billion people at risk for endemic transmission. In the effort to develop effective antiviral agents, we previously reported potential antiviral activities from selected array of natural products and compounds against dengue virus serotype 2 (DV2). In this study, we report the synthesis of two efficacious novel compounds, YK51 and YK73, and their activities against DV2 replication. Both compounds were chemically synthesised from nicotinic acid using a modified method for the synthesis of dihydropyridine. The products were tested with cell-based assays against DV2 followed by a serine protease assay. As a result, both YK51 and YK73 exhibited intriguing antiviral properties with EC50 of 3.2 and 2.4 µM, respectively. In addition, YK51 and YK73 were found to attenuate the synthesis of intracellular viral RNA and protect the switching of non-classic mechanism of protein translation. These compounds demonstrated inhibitory properties toward the activity of DV2 serine protease in a dose dependent manner. These findings demonstrate that both YK51 and YK73 serve as DV2 serine protease inhibitors that abrogate viral RNA synthesis and translation. Further investigation on these compounds to corroborate its therapeutic properties towards dengue is warranted.
Collapse
Affiliation(s)
- C S Gan
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Y K Lee
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - C H Heh
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Department of Pharmacy, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - N A Rahman
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - R Yusof
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - S Othman
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Drug Design and Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
42
|
Amir-Hassan A, Lee VS, Baharuddin A, Othman S, Xu Y, Huang M, Yusof R, Rahman NA, Othman R. Conformational and energy evaluations of novel peptides binding to dengue virus envelope protein. J Mol Graph Model 2017; 74:273-287. [PMID: 28458006 DOI: 10.1016/j.jmgm.2017.03.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 03/15/2017] [Accepted: 03/16/2017] [Indexed: 12/13/2022]
Abstract
Effective novel peptide inhibitors which targeted the domain III of the dengue envelope (E) protein by blocking dengue virus (DENV) entry into target cells, were identified. The binding affinities of these peptides towards E-protein were evaluated by using a combination of docking and explicit solvent molecular dynamics (MD) simulation methods. The interactions of these complexes were further investigated by using the Molecular Mechanics-Poisson Boltzmann Surface Area (MMPBSA) and Molecular Mechanics Generalized Born Surface Area (MMGBSA) methods. Free energy calculations of the peptides interacting with the E-protein demonstrated that van der Waals (vdW) and electrostatic interactions were the main driving forces stabilizing the complexes. Interestingly, calculated binding free energies showed good agreement with the experimental dissociation constant (Kd) values. Our results also demonstrated that specific residues might play a crucial role in the effective binding interactions. Thus, this study has demonstrated that a combination of docking and molecular dynamics simulations can accelerate the identification process of peptides as potential inhibitors of dengue virus entry into host cells.
Collapse
Affiliation(s)
- Asfarina Amir-Hassan
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Pharmacy, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Vannajan Sanghiran Lee
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Aida Baharuddin
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Shatrah Othman
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Yongtao Xu
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Northern Ireland, United Kingdom; School of Biomedical Engineering, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Meilan Huang
- School of Chemistry and Chemical Engineering, Queen's University Belfast, Northern Ireland, United Kingdom
| | - Rohana Yusof
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Noorsaadah Abd Rahman
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Rozana Othman
- Drug Design & Development Research Group, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Pharmacy, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia; Centre for Natural Product Research and Drug Discovery, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| |
Collapse
|
43
|
Muhamad M, Lee YK, Abd. Rahman N, Yusof R. Synthesized flavanoid-derived ligand reduced dengue virus type-2 replication in vitro. Asian Pac J Trop Biomed 2017. [DOI: 10.1016/j.apjtb.2016.10.013] [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] Open
|
44
|
Mithoo-Singh PK, Keng FSL, Phang SM, Leedham Elvidge EC, Sturges WT, Malin G, Abd Rahman N. Halocarbon emissions by selected tropical seaweeds: species-specific and compound-specific responses under changing pH. PeerJ 2017; 5:e2918. [PMID: 28149690 PMCID: PMC5270595 DOI: 10.7717/peerj.2918] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 08/23/2016] [Accepted: 12/17/2016] [Indexed: 11/21/2022] Open
Abstract
Five tropical seaweeds, Kappaphycus alvarezii (Doty) Doty ex P.C. Silva, Padina australis Hauck, Sargassum binderi Sonder ex J. Agardh (syn. S. aquifolium (Turner) C. Agardh), Sargassum siliquosum J. Agardh and Turbinaria conoides (J. Agardh) Kützing, were incubated in seawater of pH 8.0, 7.8 (ambient), 7.6, 7.4 and 7.2, to study the effects of changing seawater pH on halocarbon emissions. Eight halocarbon species known to be emitted by seaweeds were investigated: bromoform (CHBr3), dibro-momethane (CH2Br2), iodomethane (CH3I), diiodomethane (CH2I2), bromoiodomethane (CH2BrI), bromochlorometh-ane (CH2BrCl), bromodichloromethane (CHBrCl2), and dibro-mochloromethane (CHBr2Cl). These very short-lived halocarbon gases are believed to contribute to stratospheric halogen concentrations if released in the tropics. It was observed that the seaweeds emit all eight halocarbons assayed, with the exception of K. alvarezii and S. binderi for CH2I2 and CH3I respectively, which were not measurable at the achievable limit of detection. The effect of pH on halocarbon emission by the seaweeds was shown to be species-specific and compound specific. The highest percentage changes in emissions for the halocarbons of interest were observed at the lower pH levels of 7.2 and 7.4 especially in Padina australis and Sargassum spp., showing that lower seawater pH causes elevated emissions of some halocarbon compounds. In general the seaweed least affected by pH change in terms of types of halocarbon emission, was P. australis. The commercially farmed seaweed K. alvarezii was very sensitive to pH change as shown by the high increases in most of the compounds in all pH levels relative to ambient. In terms of percentage decrease in maximum quantum yield of photosynthesis (Fv∕Fm) prior to and after incubation, there were no significant correlations with the various pH levels tested for all seaweeds. The correlation between percentage decrease in the maximum quantum yield of photosynthesis (Fv∕Fm) and halocarbon emission rates, was significant only for CH2BrCl emission by P. australis (r = 0.47; p ≤ 0.04), implying that photosynthesis may not be closely linked to halocarbon emissions by the seaweeds studied. Bromine was the largest contributor to the total mass of halogen emitted for all the seaweeds at all pH. The highest total amount of bromine emitted by K. alvarezii (an average of 98% of total mass of halogens) and the increase in the total amount of chlorine with decreasing seawater pH fuels concern for the expanding seaweed farming activities in the ASEAN region.
Collapse
Affiliation(s)
- Paramjeet Kaur Mithoo-Singh
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Fiona S.-L. Keng
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia
- Institute of Graduate Studies (IGS), University of Malaya, Kuala Lumpur, Malaysia
| | - Siew-Moi Phang
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, Kuala Lumpur, Malaysia
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Emma C. Leedham Elvidge
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - William T. Sturges
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | - Gill Malin
- Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
| | | |
Collapse
|
45
|
Graubner FR, Reichler IM, Rahman NA, Payan-Carreira R, Boos A, Kowalewski MP. Decidualization of the canine uterus: From early until late gestational in vivo morphological observations, and functional characterization of immortalized canine uterine stromal cell lines. Reprod Domest Anim 2016; 52 Suppl 2:137-147. [PMID: 27862405 DOI: 10.1111/rda.12849] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The apparent lack of classical mechanisms for maternal recognition of pregnancy is one of the most intriguing features of canine reproduction. Consequently, similar levels of circulating luteal steroids are observed in pregnant and non-pregnant dogs. However, the early pre-implantation canine embryo locally modulates uterine responses to its presence, facilitating the successful onset of pregnancy. As a part of this interaction, the canine uterus undergoes a species-specific decidualization. Maternal stroma-derived decidual cells develop, the only cells of the canine placenta expressing progesterone receptor (PGR). There exists an acute need for an in vitro stable cell line model for canine decidualization. Therefore, herein our goal was to establish, immortalize and characterize such a cell line. We immortalized three monolayer dog uterine stromal (DUS) cell lines by stably transfecting them with SV40Tag oncogene. Cells retained their mesenchymal character for over 30 passages, as evidenced by VIMENTIN staining. Genomic incorporation of the SV40Tag protein was confirmed by immunofluorescence and Western blot analyses. Cells submitted to a classical in vitro decidualization protocol (N6,2'-O-dibutyryladenosine-3',5'-cyclic monophosphate) revealed upregulated gene levels of selected major decidualization markers (e.g. PRLR, PGR, IGF1, PTGES). Additionally, the basic decidualization capability of PGE2 was demonstrated, revealing increased levels of, for example, PGR and PRLR gene expression, thereby implying its involvement in the progesterone-dependent decidualization in the canine uterus. In summary, our in vitro model with immortalized DUS cell line could serve as an ideal and unique model to study the underlying molecular and endocrine mechanisms of canine decidualization.
Collapse
Affiliation(s)
- F R Graubner
- Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - I M Reichler
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - N A Rahman
- Department of Physiology, Institute of Biomedicine, University of Turku, Turku, Finland
| | - R Payan-Carreira
- Centro de Ciência Animal e Veterinária (CECAV), Zootecnia Department, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - A Boos
- Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - M P Kowalewski
- Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| |
Collapse
|
46
|
Tee JT, Keane T, Meijer AJHM, Khaledi H, Abd Rahman N, Chee CF. ChemInform Abstract: A Strategy Toward the Biomimetic Synthesis of (.+-.)-Morusalbanol A Pentamethyl Ether. ChemInform 2016; 47. [DOI: 10.1002/chin.201649188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
47
|
Yaeghoobi M, Frimayanti N, Chee CF, Ikram KK, Najjar BO, Zain SM, Abdullah Z, Wahab HA, Rahman NA. QSAR, in silico docking and in vitro evaluation of chalcone derivatives as potential inhibitors for H1N1 virus neuraminidase. Med Chem Res 2016. [DOI: 10.1007/s00044-016-1636-5] [Citation(s) in RCA: 13] [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] [Indexed: 12/01/2022]
|
48
|
Tee JT, Yaeghoobi M, Chee CF, Rahman NA. ChemInform Abstract: Efficient One-Pot Synthesis of 2,2-Dimethyl-2H-chromenes via Pd(II)-Catalyzed Coupling and SiO 2-Promoted Condensation of o-Halophenols with 2-Methyl-3-buten-2-ol. ChemInform 2015; 46:no-no. [DOI: 10.1002/chin.201549143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|
49
|
Tee JT, Yaeghoobi M, Chee CF, Rahman NA. Efficient One-Pot Synthesis of 2,2-Dimethyl-2 H-chromenes via Pd(II)-Catalyzed Coupling and SiO 2-Promoted Condensation of o-Halophenols with 2-Methyl-3-buten-2-ol. SYNTHETIC COMMUN 2015. [DOI: 10.1080/00397911.2015.1056371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jia Ti Tee
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Marzieh Yaeghoobi
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Chin Fei Chee
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | | |
Collapse
|
50
|
Lee YK, Tay KS, Lee VS, Rahman NA. A magnetically recyclable heterogeneous BINOL organocatalyst for the asymmetric aldol reaction. Applied Catalysis A: General 2015; 502:246-253. [DOI: 10.1016/j.apcata.2015.06.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
|