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  1. Article ; Online: Potential of ADAM 17 Signal Peptide To Form Amyloid Aggregates

    Bhardwaj, Taniya / Giri, Rajanish

    ACS chemical neuroscience

    2023  Volume 14, Issue 20, Page(s) 3818–3825

    Abstract: ADAM 17, a disintegrin and metalloproteinase 17 belonging to the adamalysin protein family, is a ... ...

    Abstract ADAM 17, a disintegrin and metalloproteinase 17 belonging to the adamalysin protein family, is a Zn
    MeSH term(s) Amyloid beta-Peptides/metabolism ; Protein Sorting Signals ; ADAM17 Protein/metabolism ; Peptide Fragments/metabolism ; Amyloid/metabolism ; Amyloidogenic Proteins ; Membrane Proteins
    Chemical Substances Amyloid beta-Peptides ; Protein Sorting Signals ; ADAM17 Protein (EC 3.4.24.86) ; Peptide Fragments ; Amyloid ; Amyloidogenic Proteins ; Membrane Proteins
    Language English
    Publishing date 2023-10-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1948-7193
    ISSN (online) 1948-7193
    DOI 10.1021/acschemneuro.3c00424
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Advances in non-covalent based inhibitors targeting Myc: a promising approach for cancer treatment.

    Singh, Vipendra Kumar / Rajak, Naina / Giri, Rajanish / Garg, Neha

    Future medicinal chemistry

    2023  Volume 16, Issue 2, Page(s) 101–103

    MeSH term(s) Humans ; Antineoplastic Agents/pharmacology ; Antineoplastic Agents/therapeutic use ; Proto-Oncogene Proteins c-myc ; Neoplasms/drug therapy
    Chemical Substances Antineoplastic Agents ; Proto-Oncogene Proteins c-myc
    Language English
    Publishing date 2023-12-12
    Publishing country England
    Document type Editorial
    ISSN 1756-8927
    ISSN (online) 1756-8927
    DOI 10.4155/fmc-2023-0332
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Investigating the folding dynamics of NS2B protein of Zika virus.

    Kumar, Ankur / Kumar, Prateek / Mishra, Pushpendra Mani / Giri, Rajanish

    Virology

    2023  Volume 584, Page(s) 24–36

    Abstract: NS2B protein of the Zika virus acts as a co-factor for NS3 protease and also involves in remodeling NS3 protease structure. Therefore, we investigated the overall dynamics of NS2B protein. We find surprising similarities between selected flavivirus NS2B ... ...

    Abstract NS2B protein of the Zika virus acts as a co-factor for NS3 protease and also involves in remodeling NS3 protease structure. Therefore, we investigated the overall dynamics of NS2B protein. We find surprising similarities between selected flavivirus NS2B model structures predicted from Alphafold2. Further, the simulated ZIKV NS2B protein structure shows a disordered cytosolic domain (residues 45-95) as a part of a full-length protein. Since only the cytosolic domain of NS2B is sufficient for the protease activity, we also investigated the conformational dynamics of only ZIKV NS2B cytosolic domain (residues 49-95) in the presence of TFE, SDS, Ficoll, and PEG using simulation and spectroscopy. The presence of TFE induces α-helix in NS2B cytosolic domain (residues 49-95). On the other hand, the presence of SDS, ficoll, and PEG does not induce secondary structural change. This dynamics study could have implications for some unknown folds of the NS2B protein.
    MeSH term(s) Humans ; Zika Virus/metabolism ; Zika Virus Infection ; Viral Nonstructural Proteins/metabolism ; Ficoll/metabolism ; Peptide Hydrolases/metabolism
    Chemical Substances Viral Nonstructural Proteins ; Ficoll (25702-74-3) ; Peptide Hydrolases (EC 3.4.-)
    Language English
    Publishing date 2023-05-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2023.04.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Coronaviruses spike glycoprotein endodomains: The sequence and structure-based comprehensive study.

    Kumar, Prateek / Bhardwaj, Aparna / Mukherjee, Bodhidipra / Joshi, Richa / Giri, Rajanish

    Protein science : a publication of the Protein Society

    2023  Volume 32, Issue 11, Page(s) e4804

    Abstract: Any protein's flexibility or region makes it available to interact with many biomolecules in the cell. Specifically, such interactions in viruses help them to perform more functions despite having a smaller genome. Therefore, these flexible regions can ... ...

    Abstract Any protein's flexibility or region makes it available to interact with many biomolecules in the cell. Specifically, such interactions in viruses help them to perform more functions despite having a smaller genome. Therefore, these flexible regions can be exciting and essential targets to be explored for their role in pathogenicity and therapeutic developments as they achieve essential interactions. In the continuation with our previous study on disordered analysis of SARS-CoV-2 spike protein's cytoplasmic tail (CTR), or endodomain, here we have explored the endodomain's disordered potential of six other coronaviruses using multiple bioinformatics approaches and molecular dynamics simulations. Based on the comprehensive analysis of its sequence and structural composition, we report the varying disorder propensity in endodomains of spike proteins of coronaviruses. The observations of this study may help to understand the importance of spike glycoprotein endodomain and creating therapeutic interventions against them.
    MeSH term(s) Humans ; Spike Glycoprotein, Coronavirus/chemistry ; SARS-CoV-2/genetics ; SARS-CoV-2/metabolism ; Molecular Dynamics Simulation ; Glycoproteins
    Chemical Substances spike protein, SARS-CoV-2 ; Spike Glycoprotein, Coronavirus ; Glycoproteins
    Language English
    Publishing date 2023-10-13
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1106283-6
    ISSN 1469-896X ; 0961-8368
    ISSN (online) 1469-896X
    ISSN 0961-8368
    DOI 10.1002/pro.4804
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Investigating the aggregation perspective of Dengue virus proteome.

    Kapuganti, Shivani Krishna / Saumya, Kumar Udit / Verma, Deepanshu / Giri, Rajanish

    Virology

    2023  Volume 586, Page(s) 12–22

    Abstract: Dengue viruses are human pathogens that are transmitted through mosquitoes. Apart from the typical symptoms associated with viral fevers, DENV infections are known to cause several neurological complications such as meningitis, encephalitis, intracranial ...

    Abstract Dengue viruses are human pathogens that are transmitted through mosquitoes. Apart from the typical symptoms associated with viral fevers, DENV infections are known to cause several neurological complications such as meningitis, encephalitis, intracranial haemorrhage, retinopathies along with the more severe, and sometimes fatal, vascular leakage and dengue shock syndrome. This study was designed to investigate, in detail, the predicted viral protein aggregation prone regions among all serotypes. Further, in order to understand the cross-talk between viral protein aggregation and aggregation of cellular proteins, cross-seeding experiments between the DENV NS1 (1-30), corresponding to the β-roll domain and the diabetes hallmark protein, amylin, were performed. Various techniques such as fluorescence spectroscopy, circular dichroism, atomic force microscopy and immunoblotting have been employed for this. We observe that the DENV proteomes have many predicted APRs and the NS1 (1-30) of DENV1-3, 2K and capsid anchor of DENV2 and DENV4 are capable of forming amyloids, in vitro. Further, the DENV NS1 (1-30), aggregates are also able to cross-seed and enhance amylin aggregation and vice-versa. This knowledge may lead to an opportunity for designing suitable inhibitors of protein aggregation that may be beneficial for viral infections and comorbidities.
    MeSH term(s) Dengue Virus/chemistry ; Dengue Virus/classification ; Proteome ; Viral Proteins/chemistry ; Viral Proteins/metabolism ; Islet Amyloid Polypeptide/metabolism ; Protein Aggregates ; Humans ; Dengue/metabolism ; Dengue/pathology ; Dengue/virology ; Diabetes Mellitus, Type 2/metabolism ; Diabetes Mellitus, Type 2/pathology
    Chemical Substances Proteome ; Viral Proteins ; NS1 protein, Flavivirus ; Islet Amyloid Polypeptide ; Protein Aggregates
    Language English
    Publishing date 2023-07-13
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2023.07.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Mitoxantrone dihydrochloride, an FDA approved drug, binds with SARS-CoV-2 NSP1 C-terminal.

    Kumar, Prateek / Bhardwaj, Taniya / Giri, Rajanish

    RSC advances

    2022  Volume 12, Issue 9, Page(s) 5648–5655

    Abstract: One of the major virulence factors of SARS-CoV-2, NSP1, is a vital drug target due to its role in host immune evasion through multiple pathways. NSP1 protein is associated with inhibiting host mRNA translation by binding to the small subunit of ribosome ... ...

    Abstract One of the major virulence factors of SARS-CoV-2, NSP1, is a vital drug target due to its role in host immune evasion through multiple pathways. NSP1 protein is associated with inhibiting host mRNA translation by binding to the small subunit of ribosome through its C-terminal region. Previously, we have shown the structural dynamics of the NSP1 C-terminal region (NSP1-CTR) in different physiological environments. So, it would be very interesting to investigate the druggable compounds that could bind with NSP1-CTR. Here, in this article, we have performed different spectroscopic technique-based binding assays of an anticancer drug mitoxantrone dihydrochloride (MTX) against the NSP1-CTR. We have also performed molecular dynamics simulations of the docked complex with two different force fields up to one microsecond. Overall, our results have suggested good binding between NSP1-CTR and MTX and may have implications in developing therapeutic strategies targeting the NSP1 protein of SARS-CoV-2.
    Language English
    Publishing date 2022-02-16
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d1ra07434b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Structural dynamics of Zika virus NS1 via a reductionist approach reveal the disordered nature of its β-roll domain in isolation.

    Kapuganti, Shivani Krishna / Kumar, Prateek / Giri, Rajanish

    Virology

    2022  Volume 573, Page(s) 72–83

    Abstract: Flavivirus Non-structural 1 (NS1) protein performs multiple functions and it is highly plausible that significant structural and folding dynamics of NS1 might play a role in its multifunctionality. It is important to understand the structural ... ...

    Abstract Flavivirus Non-structural 1 (NS1) protein performs multiple functions and it is highly plausible that significant structural and folding dynamics of NS1 might play a role in its multifunctionality. It is important to understand the structural conformations of NS1 and its domains in isolation, possibly highlighting the implications on the overall NS1 protein dynamics. Therefore, we have employed extensively long molecular dynamic (MD) simulations in understanding the dynamics of the three structural domains (i.e., β-roll, wing, and β-ladder) in isolation, as a reductionist approach. We also found that the β-ladder domain is highly flexible, while the β-roll domain is disordered during long simulations. Further, we experimentally validated our findings using CD spectroscopy and confirmed the intrinsically disordered behavior of NS1 β-roll in isolation and lipid mimetic environments. Therefore, we believe this study may have implications for significant dynamics played by NS1 protein, specifically during oligomerization of NS1.
    MeSH term(s) Animals ; Flavivirus/metabolism ; Molecular Dynamics Simulation ; Viral Nonstructural Proteins/metabolism ; Zika Virus/metabolism ; Zika Virus Infection
    Chemical Substances Viral Nonstructural Proteins
    Language English
    Publishing date 2022-06-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2022.06.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Transactivation domain of Adenovirus Early Region 1A (E1A)

    Nitin Sharma / Kundlik Gadhave / Prateek Kumar / Rajanish Giri

    Current Research in Structural Biology, Vol 4, Iss , Pp 29-

    Investigating folding dynamics and aggregation

    2022  Volume 40

    Abstract: Transactivation domain of Adenovirus Early region 1A (E1A) oncoprotein is an intrinsically disordered molecular hub protein. It is involved in binding to different domains of human cell transcriptional co-activators such as retinoblastoma (pRb), CREB- ... ...

    Abstract Transactivation domain of Adenovirus Early region 1A (E1A) oncoprotein is an intrinsically disordered molecular hub protein. It is involved in binding to different domains of human cell transcriptional co-activators such as retinoblastoma (pRb), CREB-binding protein (CBP), and its paralogue p300. The conserved region 1 (TAD) of E1A is known to undergo structural transitions and folds upon interaction with transcriptional adaptor zinc finger 2 (TAZ2). Previous reports on Taz2-E1A studies have suggested the formation of helical conformations of E1A-TAD. However, the folding behavior of the TAD region in isolation has not been studied in detail. Here, we have elucidated the folding behavior of E1A peptide at varied temperatures and solution conditions. Further, we have studied the effects of macromolecular crowding on E1A-TAD peptide. Additionally, we have also predicted the molecular recognition features of E1A using MoRF predictors. The predicted MoRFs are consistent with its structural transitions observed during TAZ2 interactions for transcriptional regulation in literature. Also, as a general rule of MoRFs, E1A undergoes helical transitions in alcohol and osmolyte solution. Finally, we studied the aggregation behavior of E1A, where we observed that the E1A could form amyloid-like aggregates that are cytotoxic to mammalian cells.
    Keywords Intrinsically disordered proteins ; Molecular recognition elements ; E1A ; Protein folding ; Protein aggregation ; Biology (General) ; QH301-705.5
    Subject code 612
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Investigating the conformational dynamics of Zika virus NS4B protein.

    Bhardwaj, Taniya / Kumar, Prateek / Giri, Rajanish

    Virology

    2022  Volume 575, Page(s) 20–35

    Abstract: Zika virus (ZIKV) NS4B protein is a membranotropic multifunctional protein. Despite its versatile functioning, its topology and dynamics are not entirely understood. There is no X-ray or cryo-EM structure available for any flaviviral NS4B full-length ... ...

    Abstract Zika virus (ZIKV) NS4B protein is a membranotropic multifunctional protein. Despite its versatile functioning, its topology and dynamics are not entirely understood. There is no X-ray or cryo-EM structure available for any flaviviral NS4B full-length protein. In this study, we have investigated the structural dynamics of full-length ZIKV NS4B protein through 3D structure models using molecular dynamics simulations and experimental techniques. Also, we employed a reductionist approach to understand the dynamics of NS4B protein where we studied its N-terminal (residues 1-38), C-terminal (residues 194-251), and cytosolic (residues 131-169) regions in isolation in addition to the full-length protein. Further, using a series of circular dichroism spectroscopic experiments, we validate the cytosolic region as an intrinsically disordered protein region. The microsecond-long all atoms molecular dynamics and replica-exchange simulations complement the experimental observations. Furthermore, we have also studied the NS4B proteins C-terminal regions of four other flaviviruses viz. DENV2, JEV, WNV, and YFV through microsecond simulations to characterize their behaviour in presence and absence of lipid membranes. There are significant differences observed in the conformations of other flavivirus NS4B C-terminal regions in comparison to ZIKV NS4B. Lastly, we have proposed a ZIKV NS4B protein model illustrating its putative topology consisting of various membrane-spanning and non-membranous regions.
    MeSH term(s) Flavivirus/metabolism ; Humans ; Intrinsically Disordered Proteins/metabolism ; Lipids ; Viral Nonstructural Proteins/chemistry ; Zika Virus/chemistry ; Zika Virus Infection
    Chemical Substances Intrinsically Disordered Proteins ; Lipids ; NS4B protein, flavivirus ; Viral Nonstructural Proteins
    Language English
    Publishing date 2022-08-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 200425-2
    ISSN 1096-0341 ; 0042-6822
    ISSN (online) 1096-0341
    ISSN 0042-6822
    DOI 10.1016/j.virol.2022.08.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Transactivation domain of Adenovirus Early Region 1A (E1A): Investigating folding dynamics and aggregation.

    Sharma, Nitin / Gadhave, Kundlik / Kumar, Prateek / Giri, Rajanish

    Current research in structural biology

    2022  Volume 4, Page(s) 29–40

    Abstract: Transactivation domain of Adenovirus Early region 1A (E1A) oncoprotein is an intrinsically disordered molecular hub protein. It is involved in binding to different domains of human cell transcriptional co-activators such as retinoblastoma (pRb), CREB- ... ...

    Abstract Transactivation domain of Adenovirus Early region 1A (E1A) oncoprotein is an intrinsically disordered molecular hub protein. It is involved in binding to different domains of human cell transcriptional co-activators such as retinoblastoma (pRb), CREB-binding protein (CBP), and its paralogue p300. The conserved region 1 (TAD) of E1A is known to undergo structural transitions and folds upon interaction with transcriptional adaptor zinc finger 2 (TAZ2). Previous reports on Taz2-E1A studies have suggested the formation of helical conformations of E1A-TAD. However, the folding behavior of the TAD region in isolation has not been studied in detail. Here, we have elucidated the folding behavior of E1A peptide at varied temperatures and solution conditions. Further, we have studied the effects of macromolecular crowding on E1A-TAD peptide. Additionally, we have also predicted the molecular recognition features of E1A using MoRF predictors. The predicted MoRFs are consistent with its structural transitions observed during TAZ2 interactions for transcriptional regulation in literature. Also, as a general rule of MoRFs, E1A undergoes helical transitions in alcohol and osmolyte solution. Finally, we studied the aggregation behavior of E1A, where we observed that the E1A could form amyloid-like aggregates that are cytotoxic to mammalian cells.
    Language English
    Publishing date 2022-01-13
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2665-928X
    ISSN (online) 2665-928X
    DOI 10.1016/j.crstbi.2022.01.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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