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  1. Article ; Online: Identification of potential neuroprotective compound from

    Ahmad, Faizan / Singh, Gagandeep / Soni, Hemant / Tandon, Smriti

    Aging medicine (Milton (N.S.W))

    2022  Volume 6, Issue 2, Page(s) 144–154

    Abstract: Objective: Alzheimer's disease (AD) is one of the most prevalent neurological ailments, affecting around 50 million individuals globally. The condition is characterized by nerve cell damage due to the formation of amyloid-beta plaques and ... ...

    Abstract Objective: Alzheimer's disease (AD) is one of the most prevalent neurological ailments, affecting around 50 million individuals globally. The condition is characterized by nerve cell damage due to the formation of amyloid-beta plaques and neurofibrillary tangles. Only a few US Food and Drug Administration (FDA)-approved medications are available in the market which are devoid of side effects, thus, making it imperative to investigate new alternatives for countering this disease. According to a recent study, microtubule affinity regulation kinase 4 (MARK4) is attributed as one of the most promising drug targets for AD, thus, being selected for this study. Compounds from
    Methods: In this study, the five most potent compounds from
    Results: The promising compounds were selected based on their ADMET profile and interactions with the active site residues of MARK4. Based on docking scores of -9.1 and -10.3 kcal/ mol, respectively, stability assessment by molecular dynamics simulation, and MMGBSA calculations, ganoderic acid A and ganoderenic acid B were found to be the most promising compounds against MARK4 which will require further in vitro and in vivo validations.
    Conclusion: Through this study, it is suggested that ganoderic acid A and ganoderenic acid B might be a class of promising compounds against AD, based on computational research, and can be further studied for preclinical and clinical studies.
    Language English
    Publishing date 2022-12-12
    Publishing country Australia
    Document type Journal Article
    ISSN 2475-0360
    ISSN (online) 2475-0360
    DOI 10.1002/agm2.12232
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Role of two aminoacyl-tRNA synthetase associated proteins (Endothelial Monocyte Activating Polypeptides 1 and 2) of Leishmania donovani in chemotaxis of human monocytes

    Tandon, Smriti / Muthuswami, Rohini / Madhubala, Rentala

    Acta tropica. 2021 Dec., v. 224

    2021  

    Abstract: Visceral leishmaniasis is caused by the protozoan parasite Leishmania donovani. It is a fatal form of leishmaniasis prevalent in Indian subcontinent. Since there are no human licensed vaccines available for leishmaniasis, chemotherapeutic drugs remain ... ...

    Abstract Visceral leishmaniasis is caused by the protozoan parasite Leishmania donovani. It is a fatal form of leishmaniasis prevalent in Indian subcontinent. Since there are no human licensed vaccines available for leishmaniasis, chemotherapeutic drugs remain the only means for combating parasitic infections. We have earlier identified a total of 26 amino-acyl tRNA synthetases (aaRS) along with five stand-alone editing domains and two aaRS-associated proteins in Leishmania donovani. In addition to their canonical role of tRNA aminoacylation, aaRS have been involved in novel functions by acquiring novel domains during evolution. The aaRS-associated proteins have been reported to be analogous to a human cytokine, EMAP II, as they possess a modified version of the heptapeptide motif responsible for the cytokine activity. In this manuscript, we report the characterization of two L. donovani aminoacyl-tRNA synthetase associated proteins which showed a human chemokine like activity. Both the proteins, L. donovani EMAP-1 and EMAP-2, possess a modified form of the heptapeptide motif, which is responsible for cytokine activity in human EMAP-2. LdEMAP-1 and LdEMAP-2 were cloned, expressed, and purified. Both LdEMAP-1 and LdEMAP-2 proteins in the promastigote stage were found to be localized in cytoplasm as confirmed by immunofluorescence. In case of L. donovani infected human THP-1 derived macrophages, secretion of LdEMAP-1 and LdEMAP-2 proteins in the cytosol of the macrophages was observed. The role of LdEMAP-1 and LdEMAP-2 in the aminoacylation of rLdTyrRS was also tested and LdEMAP-2 but not LdEMAP-1 increased the rate of aminoacylation of tyrosyl tRNA synthetase (rLdTyrRS). L. donovani EMAP-1 and EMAP-2 proteins managed to exhibit the capability of attracting human origin cells as determined by chemotaxis assay, and also were able to induce the secretion of cytokines from macrophages like their human counterpart (EMAP II). Our working hypothesis is that both of these proteins might be involved in helping the parasite to establish the infection within the host.
    Keywords Leishmania donovani ; aminoacylation ; chemokines ; chemotaxis ; cytosol ; drug therapy ; evolution ; fluorescent antibody technique ; humans ; macrophages ; monocytes ; parasites ; polypeptides ; secretion ; tyrosine-tRNA ligase ; visceral leishmaniasis ; India
    Language English
    Dates of publication 2021-12
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 210415-5
    ISSN 1873-6254 ; 0001-706X
    ISSN (online) 1873-6254
    ISSN 0001-706X
    DOI 10.1016/j.actatropica.2021.106128
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Athena: Speciality Certificate Examination case for general dermatology and dermatology in primary health care.

    Punchihewa, Nisal / Tandon, Smriti / Poon, Flora / Pawlowski, Rhonda / Chan, Yuen / Mar, Adrian

    Clinical and experimental dermatology

    2023  Volume 48, Issue 7, Page(s) 815–816

    MeSH term(s) Humans ; Dermatology/education ; Curriculum ; Primary Health Care
    Language English
    Publishing date 2023-03-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 195504-4
    ISSN 1365-2230 ; 0307-6938
    ISSN (online) 1365-2230
    ISSN 0307-6938
    DOI 10.1093/ced/llad121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Role of two aminoacyl-tRNA synthetase associated proteins (Endothelial Monocyte Activating Polypeptides 1 and 2) of Leishmania donovani in chemotaxis of human monocytes.

    Tandon, Smriti / Muthuswami, Rohini / Madhubala, Rentala

    Acta tropica

    2021  Volume 224, Page(s) 106128

    Abstract: Visceral leishmaniasis is caused by the protozoan parasite Leishmania donovani. It is a fatal form of leishmaniasis prevalent in Indian subcontinent. Since there are no human licensed vaccines available for leishmaniasis, chemotherapeutic drugs remain ... ...

    Abstract Visceral leishmaniasis is caused by the protozoan parasite Leishmania donovani. It is a fatal form of leishmaniasis prevalent in Indian subcontinent. Since there are no human licensed vaccines available for leishmaniasis, chemotherapeutic drugs remain the only means for combating parasitic infections. We have earlier identified a total of 26 amino-acyl tRNA synthetases (aaRS) along with five stand-alone editing domains and two aaRS-associated proteins in Leishmania donovani. In addition to their canonical role of tRNA aminoacylation, aaRS have been involved in novel functions by acquiring novel domains during evolution. The aaRS-associated proteins have been reported to be analogous to a human cytokine, EMAP II, as they possess a modified version of the heptapeptide motif responsible for the cytokine activity. In this manuscript, we report the characterization of two L. donovani aminoacyl-tRNA synthetase associated proteins which showed a human chemokine like activity. Both the proteins, L. donovani EMAP-1 and EMAP-2, possess a modified form of the heptapeptide motif, which is responsible for cytokine activity in human EMAP-2. LdEMAP-1 and LdEMAP-2 were cloned, expressed, and purified. Both LdEMAP-1 and LdEMAP-2 proteins in the promastigote stage were found to be localized in cytoplasm as confirmed by immunofluorescence. In case of L. donovani infected human THP-1 derived macrophages, secretion of LdEMAP-1 and LdEMAP-2 proteins in the cytosol of the macrophages was observed. The role of LdEMAP-1 and LdEMAP-2 in the aminoacylation of rLdTyrRS was also tested and LdEMAP-2 but not LdEMAP-1 increased the rate of aminoacylation of tyrosyl tRNA synthetase (rLdTyrRS). L. donovani EMAP-1 and EMAP-2 proteins managed to exhibit the capability of attracting human origin cells as determined by chemotaxis assay, and also were able to induce the secretion of cytokines from macrophages like their human counterpart (EMAP II). Our working hypothesis is that both of these proteins might be involved in helping the parasite to establish the infection within the host.
    MeSH term(s) Amino Acyl-tRNA Synthetases/genetics ; Chemotaxis ; Humans ; Leishmania donovani ; Monocytes ; Protozoan Proteins/genetics
    Chemical Substances Protozoan Proteins ; Amino Acyl-tRNA Synthetases (EC 6.1.1.-)
    Language English
    Publishing date 2021-09-09
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 210415-5
    ISSN 1873-6254 ; 0001-706X
    ISSN (online) 1873-6254
    ISSN 0001-706X
    DOI 10.1016/j.actatropica.2021.106128
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: In vitro screening of natural product-based compounds for leishmanicidal activity.

    Tandon, Smriti / Puri, Madhu / Bharath, Yada / Choudhury, Utkal Mani / Mohapatra, Debendra Kumar / Muthuswami, Rohini / Madhubala, Rentala

    Journal of parasitic diseases : official organ of the Indian Society for Parasitology

    2023  Volume 47, Issue 3, Page(s) 644–658

    Abstract: Leishmaniasis is one of the major parasitic diseases, caused by obligate intracellular ... ...

    Abstract Leishmaniasis is one of the major parasitic diseases, caused by obligate intracellular protozoa
    Language English
    Publishing date 2023-06-23
    Publishing country India
    Document type Journal Article
    ZDB-ID 2548456-4
    ISSN 0975-0703 ; 0971-7196
    ISSN (online) 0975-0703
    ISSN 0971-7196
    DOI 10.1007/s12639-023-01605-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Identification of potential inhibitors of HER2 targeting breast cancer-a structure-based drug design approach.

    Singh, Gagandeep / Al-Fahad, Dhurgham / Al-Zrkani, Mrtatha K / Chaudhuri, Tapan K / Soni, Hemant / Tandon, Smriti / Narasimhaji, Cheemalapati Venkata / Azam, Faizul / Patil, Rajesh

    Journal of biomolecular structure & dynamics

    2023  , Page(s) 1–18

    Abstract: Breast cancer is one of the most prevalent and malignant cancers in women. Most breast cancer patients show overexpression of the HER2 protein. The current study focused on identifying potent inhibitors of HER2 using a structure-based drug design ... ...

    Abstract Breast cancer is one of the most prevalent and malignant cancers in women. Most breast cancer patients show overexpression of the HER2 protein. The current study focused on identifying potent inhibitors of HER2 using a structure-based drug design approach. Prefiltered compounds from the Drugbank and the ZINC database were docked on HER2 protein using the FlexX docking tool of LeadIT. The docking study identified the 12 best molecules that interacted strongly with the active site of HER2 and also fulfilled the ADMET parameters. The complexes of these compounds with HER2 were further subjected to molecular dynamics simulation using GROMACS 2021.4, followed by the end-state MMGBSA binding energy calculations. The RMSD analysis was conducted to study the conformational changes, which revealed stability throughout the 100 ns simulation period. The local flexibility and dynamics of the simulated ligand-protein complexes were studied using RMSF analysis. The values of the radius of gyration were computed to analyze the compactness of HER2. The MMGBSA analysis provided insights into the energetic aspects of the system. The compound DB15187 emerged as the most potent candidate, showing MMGBSA-computed binding energy of -63.60 ± 3.39 kcal/mol. The study could help develop targeted therapies for HER2-positive breast cancer.Communicated by Ramaswamy H. Sarma.
    Language English
    Publishing date 2023-08-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2023.2246576
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Deciphering the interaction of benzoxaborole inhibitor AN2690 with connective polypeptide 1 (CP1) editing domain of Leishmania donovani leucyl-tRNA synthetase

    Tandon, Smriti / Manhas, Reetika / Tiwari, Neha / Munde, Manoj / Vijayan, Ramachandran / Gourinath, Samudrala / Muthuswami, Rohini / Madhubala, Rentala

    Journal of biosciences. 2020 Dec., v. 45, no. 1

    2020  

    Abstract: Leucyl-tRNA synthetases (LRS) catalyze the linkage of leucine with tRNAᴸᵉᵘ. A large insertion CP1 domain (Connective Polypeptide 1) in LRS is responsible for post-transfer editing of mis-charged aminoacyl-tRNAs. Here, we characterized the CP1 domain of ... ...

    Abstract Leucyl-tRNA synthetases (LRS) catalyze the linkage of leucine with tRNAᴸᵉᵘ. A large insertion CP1 domain (Connective Polypeptide 1) in LRS is responsible for post-transfer editing of mis-charged aminoacyl-tRNAs. Here, we characterized the CP1 domain of Leishmania donovani, a protozoan parasite, and its role in editing activity and interaction with broad spectrum anti-fungal, AN2690. The deletion mutant of LRS, devoid of CP1 domain (LRS-CP1Δ) was constructed, followed by determination of its role in editing and aminoacylation. Binding of AN2690 and different amino acids with CP1 deletion mutant and full length LRS was evaluated using isothermal titration calorimetry (ITC) and molecular dynamics simulations. The recombinant LRS-CP1Δ protein did not catalyze the aminoacylation and the editing reaction when compared to full-length LRS. Thus, indicating that CP1 domain was imperative for both aminoacylation and editing activities of LRS. Binding studies with different amino acids indicated selectivity of isoleucine by CP1 domain over other amino acids. These studies also indicated high affinity of AN2690 with the editing domain. Molecular docking studies indicated that AN2690-CP1 domain complex was stabilized by hydrogen bonding and hydrophobic interactions resulting in high binding affinity between the two. Our data suggests CP1 is crucial for the function of L. donovani LRS.
    Keywords Leishmania donovani ; aminoacylation ; calorimetry ; hydrogen ; hydrophobicity ; isoleucine ; leucine ; leucine-tRNA ligase ; molecular dynamics ; mutants ; parasites ; polypeptides ; titration
    Language English
    Dates of publication 2020-12
    Size p. 63.
    Publishing place Springer India
    Document type Article
    ZDB-ID 756157-x
    ISSN 0973-7138 ; 0250-5991
    ISSN (online) 0973-7138
    ISSN 0250-5991
    DOI 10.1007/s12038-020-00031-8
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Chemoprofiling and medicinal potential of underutilized leaves of Cyperus scariosus.

    Gandhi, Yashika / Kumar, Vijay / Singh, Gagandeep / Prasad, Shyam Baboo / Mishra, Sujeet K / Soni, Hemant / Rawat, Hemant / Singh, Simranjeet / Charde, Vaibhav / Gupta, Akhil / Dhanjal, Daljeet Singh / Jha, Sudhanshu Kumar / Tandon, Smriti / Bhagwat, Prateeksha / Arya, Jagdish C / Ramamurthy, Praveen C / Acharya, Rabinarayan / Narasimhaji, Ch Venkata / Singh, Arjun /
    Singh, Ravindra / Srikanth, Narayanam / Webster, Thomas J

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 7263

    Abstract: Agro-waste is the outcome of the under-utilization of bioresources and a lack of knowledge to re-use this waste in proper ways or a circular economy approach. In the Indian medicinal system, the root of Cyperus scariosus (CS) is used at a large scale due ...

    Abstract Agro-waste is the outcome of the under-utilization of bioresources and a lack of knowledge to re-use this waste in proper ways or a circular economy approach. In the Indian medicinal system, the root of Cyperus scariosus (CS) is used at a large scale due to their vital medicinal properties. Unfortunately, the aerial part of CS is treated as agro-waste and is an under-utilized bioresource. Due to a lack of knowledge, CS is treated as a weed. This present study is the first ever attempt to explore CS leaves as medicinally and a nutrient rich source. To determine the food and nutritional values of the neglected part of Cyperus scariosus R.Br. (CS), i.e. CS leaves, phytochemicals and metal ions of CS were quantified by newly developed HPLC and ICPOES-based methods. The content of the phytochemicals observed in HPLC analysis for caffeic acid, catechin, epicatechin, trans-p-coumaric acid, and trans-ferulic acid was 10.51, 276.15, 279.09, 70.53, and 36.83 µg/g, respectively. In GC-MS/MS analysis, fatty acids including linolenic acid, phytol, palmitic acid, etc. were identified. In ICPOES analysis, the significant content of Na, K, Ca, Cu, Fe, Mg, Mn, and Zn was observed. The TPC and TFC of the CS leaves was 17.933 mg GAE eq./g and 130.767 mg QCE eq./g along with an IC
    MeSH term(s) Cyperus ; Plant Extracts/chemistry ; Tandem Mass Spectrometry ; Antioxidants/analysis ; Phytochemicals/pharmacology ; Phytochemicals/analysis ; Plant Leaves/chemistry
    Chemical Substances Plant Extracts ; Antioxidants ; Phytochemicals
    Language English
    Publishing date 2024-03-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-58041-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Dioxinodehydroeckol: A Potential Neuroprotective Marine Compound Identified by In Silico Screening for the Treatment and Management of Multiple Brain Disorders.

    Ahmad, Faizan / Sachdeva, Punya / Sachdeva, Bhuvi / Singh, Gagandeep / Soni, Hemant / Tandon, Smriti / Rafeeq, Misbahuddin M / Alam, Mohammad Zubair / Baeissa, Hanadi M / Khalid, Mohammad

    Molecular biotechnology

    2022  Volume 66, Issue 4, Page(s) 663–686

    Abstract: Neurodegenerative disorders such as Alzheimer's disease (AD), Glioblastoma multiforme (GBM), Amyotrophic lateral sclerosis (ALS), and Parkinson's disease (PD) are some of the most prevalent neurodegenerative disorders in humans. Even after a variety of ... ...

    Abstract Neurodegenerative disorders such as Alzheimer's disease (AD), Glioblastoma multiforme (GBM), Amyotrophic lateral sclerosis (ALS), and Parkinson's disease (PD) are some of the most prevalent neurodegenerative disorders in humans. Even after a variety of advanced therapies, prognosis of all these disorders is not favorable, with survival rates of 14-20 months only. To further improve the prognosis of these disorders, it is imperative to discover new compounds which will target effector proteins involved in these disorders. In this study, we have focused on in silico screening of marine compounds against multiple target proteins involved in AD, GBM, ALS, and PD. Fifty marine-origin compounds were selected from literature, out of which, thirty compounds passed ADMET parameters. Ligand docking was performed after ADMET analysis for AD, GBM, ALS, and PD-associated proteins in which four protein targets Keap1, Ephrin A2, JAK3 Kinase domain, and METTL3-METTL14 N6-methyladenosine methyltransferase (MTA70) were found to be binding strongly with the screened compound Dioxinodehydroeckol (DHE). Molecular dynamics simulations were performed at 100 ns with triplicate runs to validate the docking score and assess the dynamics of DHE interactions with each target protein. The results indicated Dioxinodehydroeckol, a novel marine compound, to be a putative inhibitor among all the screened molecules, which might be effective against multiple target proteins involved in neurological disorders, requiring further in vitro and in vivo validations.
    MeSH term(s) Molecular Docking Simulation ; Humans ; Neuroprotective Agents/pharmacology ; Neuroprotective Agents/chemistry ; Molecular Dynamics Simulation ; Dioxins/pharmacology ; Dioxins/chemistry ; Computer Simulation ; Brain Diseases/drug therapy ; Brain Diseases/metabolism ; Aquatic Organisms/chemistry
    Chemical Substances Neuroprotective Agents ; Dioxins
    Language English
    Publishing date 2022-12-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1193057-3
    ISSN 1559-0305 ; 1073-6085
    ISSN (online) 1559-0305
    ISSN 1073-6085
    DOI 10.1007/s12033-022-00629-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Deciphering the interaction of benzoxaborole inhibitor AN2690 with connective polypeptide 1 (CP1) editing domain of

    Tandon, Smriti / Manhas, Reetika / Tiwari, Neha / Munde, Manoj / Vijayan, Ramachandran / Gourinath, Samudrala / Muthuswami, Rohini / Madhubala, Rentala

    Journal of biosciences

    2020  Volume 45

    Abstract: Leucyl-tRNA synthetases (LRS) catalyze the linkage of leucine with ... ...

    Abstract Leucyl-tRNA synthetases (LRS) catalyze the linkage of leucine with tRNA
    MeSH term(s) Amino Acid Sequence ; Antifungal Agents/chemistry ; Antifungal Agents/pharmacology ; Antiprotozoal Agents/chemistry ; Antiprotozoal Agents/pharmacology ; Binding Sites ; Boron Compounds/chemistry ; Boron Compounds/pharmacology ; Bridged Bicyclo Compounds, Heterocyclic/chemistry ; Bridged Bicyclo Compounds, Heterocyclic/pharmacology ; Drug Repositioning ; Gene Expression ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Leishmania donovani/chemistry ; Leishmania donovani/enzymology ; Leishmania donovani/genetics ; Leucine-tRNA Ligase/antagonists & inhibitors ; Leucine-tRNA Ligase/chemistry ; Leucine-tRNA Ligase/genetics ; Leucine-tRNA Ligase/metabolism ; Molecular Docking Simulation ; Molecular Dynamics Simulation ; Peptides/chemistry ; Peptides/metabolism ; Protein Binding ; Protein Conformation, alpha-Helical ; Protein Conformation, beta-Strand ; Protein Interaction Domains and Motifs ; Protein Processing, Post-Translational ; Protozoan Proteins/antagonists & inhibitors ; Protozoan Proteins/chemistry ; Protozoan Proteins/genetics ; Protozoan Proteins/metabolism ; RNA, Transfer, Leu/chemistry ; RNA, Transfer, Leu/metabolism ; Recombinant Proteins/chemistry ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; Sequence Alignment ; Sequence Deletion ; Sequence Homology, Amino Acid ; Transfer RNA Aminoacylation/genetics
    Chemical Substances Antifungal Agents ; Antiprotozoal Agents ; Boron Compounds ; Bridged Bicyclo Compounds, Heterocyclic ; Peptides ; Protozoan Proteins ; RNA, Transfer, Leu ; Recombinant Proteins ; Leucine-tRNA Ligase (EC 6.1.1.4) ; tavaborole (K124A4EUQ3)
    Language English
    Publishing date 2020-05-07
    Publishing country India
    Document type Journal Article
    ZDB-ID 756157-x
    ISSN 0973-7138 ; 0250-5991
    ISSN (online) 0973-7138
    ISSN 0250-5991
    Database MEDical Literature Analysis and Retrieval System OnLINE

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