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  1. Article ; Online: Why Are Nucleosome Breathing Dynamics Asymmetric?

    Mondal, Anupam / Kolomeisky, Anatoly B

    The journal of physical chemistry letters

    2024  Volume 15, Issue 2, Page(s) 422–431

    Abstract: In eukaryotic cells, DNA is bound to nucleosomes, but DNA segments occasionally unbind in the process known as nucleosome breathing. Although DNA can unwrap simultaneously from both ends of the nucleosome (symmetric breathing), experiments indicate that ... ...

    Abstract In eukaryotic cells, DNA is bound to nucleosomes, but DNA segments occasionally unbind in the process known as nucleosome breathing. Although DNA can unwrap simultaneously from both ends of the nucleosome (symmetric breathing), experiments indicate that DNA prefers to dissociate from only one end (asymmetric breathing). However, the molecular origin of the asymmetry is not understood. We developed a new theoretical approach that gives microscopic explanations of asymmetric breathing. It is based on a stochastic description that leads to a comprehensive evaluation of dynamics by using effective free-energy landscapes. It is shown that asymmetric breathing follows the kinetically preferred pathways. In addition, it is also found that asymmetric breathing leads to a faster target search by transcription factors. Theoretical predictions, supported by computer simulations, agree with experiments. It is proposed that nature utilizes the symmetry of nucleosome breathing to achieve a better dynamic accessibility of chromatin for more efficient genetic regulation.
    MeSH term(s) Nucleosomes ; Chromatin ; DNA/metabolism ; Transcription Factors ; Computer Simulation
    Chemical Substances Nucleosomes ; Chromatin ; DNA (9007-49-2) ; Transcription Factors
    Language English
    Publishing date 2024-01-05
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c03339
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Role of Nucleosome Sliding in the Protein Target Search for Covered DNA Sites.

    Mondal, Anupam / Kolomeisky, Anatoly B

    The journal of physical chemistry letters

    2023  Volume 14, Issue 31, Page(s) 7073–7082

    Abstract: Associations of transcription factors (TFs) with specific sites on DNA initiate major cellular processes. But DNA in eukaryotic cells is covered by nucleosomes which prevent TFs from binding. However, nucleosome structures on DNA are not static and ... ...

    Abstract Associations of transcription factors (TFs) with specific sites on DNA initiate major cellular processes. But DNA in eukaryotic cells is covered by nucleosomes which prevent TFs from binding. However, nucleosome structures on DNA are not static and exhibit breathing and sliding. We develop a theoretical framework to investigate the effect of nucleosome sliding on a protein target search. By analysis of a discrete-state stochastic model of nucleosome sliding, search dynamics are explicitly evaluated. It is found that for long sliding lengths the target search dynamics are faster for normal TFs that cannot enter the nucleosomal DNA. But for more realistic short sliding lengths, the so-called pioneer TFs, which can invade nucleosomal DNA, locate specific sites faster. It is also suggested that nucleosome breathing, which is a faster process, has a stronger effect on protein search dynamics than that of nucleosome sliding. Theoretical arguments to explain these observations are presented.
    MeSH term(s) Nucleosomes ; Transcription Factors ; DNA/chemistry ; Binding Sites
    Chemical Substances Nucleosomes ; Transcription Factors ; DNA (9007-49-2)
    Language English
    Publishing date 2023-08-01
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c01704
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Network Biology and Medicine to Rescue: Applications for Retinal Disease Mechanisms and Therapy.

    Mondal, Anupam K / Swaroop, Anand

    Advances in experimental medicine and biology

    2023  Volume 1415, Page(s) 165–171

    Abstract: Inherited retinal degenerations (IRDs) are clinically and genetically heterogenous blinding diseases that manifest through dysfunction of target cells, photoreceptors, and retinal pigment epithelium (RPE) in the retina. Despite knowledge of numerous ... ...

    Abstract Inherited retinal degenerations (IRDs) are clinically and genetically heterogenous blinding diseases that manifest through dysfunction of target cells, photoreceptors, and retinal pigment epithelium (RPE) in the retina. Despite knowledge of numerous underlying genetic defects, current therapeutic approaches, including gene centric applications, have had limited success, thereby asserting the need of new directions for basic and translational research. Human diseases have commonalities that can be represented in a network form, called diseasome, which captures relationships among disease genes, proteins, metabolites, and patient meta-data. Clinical and genetic information of IRDs suggest shared relationships among pathobiological factors, making these a model case for network medicine. Characterization of the diseasome would considerably improve our understanding of retinal pathologies and permit better design of targeted therapies for disrupted regions within the integrated disease network. Network medicine in synergy with the ongoing artificial intelligence revolution can boost therapeutic developments, especially gene agnostic treatment opportunities.
    MeSH term(s) Humans ; Artificial Intelligence ; Retina/pathology ; Retinal Degeneration/genetics ; Retinal Degeneration/therapy ; Retinal Degeneration/pathology ; Retinal Pigment Epithelium/pathology ; Biology
    Language English
    Publishing date 2023-07-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 410187-X
    ISSN 0065-2598
    ISSN 0065-2598
    DOI 10.1007/978-3-031-27681-1_25
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Nucleosome Breathing Facilitates the Search for Hidden DNA Sites by Pioneer Transcription Factors.

    Mondal, Anupam / Felipe, Cayke / Kolomeisky, Anatoly B

    The journal of physical chemistry letters

    2023  Volume 14, Issue 17, Page(s) 4096–4103

    Abstract: Transfer of genetic information starts with transcription factors (TFs) binding to specific sites on DNA. But in living cells, DNA is mostly covered by nucleosomes. There are proteins, known as pioneer TFs, that can efficiently reach the DNA sites hidden ...

    Abstract Transfer of genetic information starts with transcription factors (TFs) binding to specific sites on DNA. But in living cells, DNA is mostly covered by nucleosomes. There are proteins, known as pioneer TFs, that can efficiently reach the DNA sites hidden by nucleosomes, although the underlying mechanisms are not understood. Using the recently proposed idea of interaction-compensation mechanism, we develop a stochastic model for the target search on DNA with nucleosome breathing. It is found that nucleosome breathing can significantly accelerate the search by pioneer TFs in comparison to situations without breathing. We argue that this is the result of the interaction-compensation mechanism that allows proteins to enter the inner nucleosome region through the outer DNA segment. It is suggested that nature optimized pioneer TFs to take advantage of nucleosome breathing. The presented theoretical picture provides a possible microscopic explanation for the successful invasion of nucleosome-buried genes.
    MeSH term(s) Nucleosomes ; Transcription Factors ; Protein Binding ; DNA/metabolism ; Binding Sites
    Chemical Substances Nucleosomes ; Transcription Factors ; DNA (9007-49-2)
    Language English
    Publishing date 2023-04-26
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c00529
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Tea and its phytochemicals: Hidden health benefits & modulation of signaling cascade by phytochemicals

    Bag, Sagar / Mondal, Anupam / Majumder, Anusha / Banik, Avishek

    Food chemistry. 2022 Mar. 01, v. 371

    2022  

    Abstract: Tea, one of the most widely consumed beverages, is prepared from the leaves of the Camellia sinensis. The promising health recompenses of tea have been linked to its different phenolic components, which have diverse biological characteristics. Tea also ... ...

    Abstract Tea, one of the most widely consumed beverages, is prepared from the leaves of the Camellia sinensis. The promising health recompenses of tea have been linked to its different phenolic components, which have diverse biological characteristics. Tea also contains several flavonoids, alkaloids, phenolic, theanine, etc., which are associated with anti-oxidant characteristics and a variety of health benefits. It can also lower the pervasiveness of neurological disorders as well as prevent different types of cancer, metabolic syndromes, cardiovascular diseases, urinary stone, obesity, type 2 diabetes. Keeping in mind that tea helps to improve health and prevents many diseases, its consumption has been regarded as a “health-promoting habit” and current medical investigators have established the scientific basis for this concept over time. The current review provides new updated information and perspectives on the tea phytochemicals and their overall health benefits based on molecular processes, experimental studies, and clinical trials.
    Keywords Camellia sinensis ; antioxidants ; flavonoids ; food chemistry ; noninsulin-dependent diabetes mellitus ; obesity ; tea ; theanine ; urinary calculi
    Language English
    Dates of publication 2022-0301
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 243123-3
    ISSN 1873-7072 ; 0308-8146
    ISSN (online) 1873-7072
    ISSN 0308-8146
    DOI 10.1016/j.foodchem.2021.131098
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Exploring tea (Camellia sinensis) microbiome: Insights into the functional characteristics and their impact on tea growth promotion

    Bag, Sagar / Mondal, Anupam / Banik, Avishek

    Microbiological research. 2022 Jan., v. 254

    2022  

    Abstract: Tea (Camellia sinensis) is perhaps the most popular and economic beverage in the globe due to its distinctive fragrance and flavour generated by the leaves of commercially farmed tea plants. The tea microbiome has now become a prominent topic of ... ...

    Abstract Tea (Camellia sinensis) is perhaps the most popular and economic beverage in the globe due to its distinctive fragrance and flavour generated by the leaves of commercially farmed tea plants. The tea microbiome has now become a prominent topic of attention for microbiologists in recent years as it can help the plant for soil nutrient acquisition as well as stress management. Tea roots are well known to be colonized by Arbuscular Mycorrhizal Fungi (AMF) and many other beneficial microorganisms that boost the growth of the tea which increases leaf amino acids, protein, caffeine, and polyphenols content. One of the primary goals of rhizosphere microbial biology is to aid in the establishment of agricultural systems that provide high quantities of the food supply while minimizing environmental effects and anthropogenic activities. The present review is aimed to highlight the importance of microbes (along with their phylogeny) derived from cultivated and natural tea rhizospheres to understand the role of AMF and rhizospheric bacterial population to improve plant growth, enhancement of tea quality, and protecting tea plants from pathogens. This review also summarizes recent advances in our understanding of the diversity and profile of tea-associated bacteria. The utilization of the tea microbiome as a “natural resource” could provide holistic development in tea cultivation to ensure sustainability, highlighting knowledge gaps and future microbiome research.
    Keywords Camellia sinensis ; beverages ; caffeine ; flavor ; food availability ; growth promotion ; leaves ; microbiome ; odors ; phylogeny ; plant growth ; polyphenols ; research ; rhizosphere ; soil nutrients ; stress management ; tea ; vesicular arbuscular mycorrhizae
    Language English
    Dates of publication 2022-01
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 1189614-0
    ISSN 1618-0623 ; 0944-5013
    ISSN (online) 1618-0623
    ISSN 0944-5013
    DOI 10.1016/j.micres.2021.126890
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Characterization of a biofilm-forming, amylase-producing, and heavy-metal-bioremediating strain Micrococcus sp. BirBP01 isolated from oligotrophic subsurface lateritic soil.

    Pandit, Baishali / Moin, Abdul / Mondal, Anupam / Banik, Avishek / Alam, Masrure

    Archives of microbiology

    2023  Volume 205, Issue 11, Page(s) 351

    Abstract: Lateritic soil is the reddish to brown-colored soil composed mainly of iron or aluminium oxides, hydroxides, or oxyhydroxides. Information on bacteria that inhabit this soil type, their ecological role, and metabolic potential are scarce. We have ... ...

    Abstract Lateritic soil is the reddish to brown-colored soil composed mainly of iron or aluminium oxides, hydroxides, or oxyhydroxides. Information on bacteria that inhabit this soil type, their ecological role, and metabolic potential are scarce. We have isolated and partially characterized a bacterial strain BirBP01 from a lead, calcium, and magnesium-rich, oligotrophic subsurface lateritic soil-sample collected from 12-feet deep horizon of a laterite mining pit in Birbhum district, India. The isolate is a biofilm-forming, Gram-positive bacterium having a sarcinae arrangement, mesophilic, slightly alkaliphilic, able to produce amylase, and resistant against multiple heavy-metals. BirBP01 has the ability to bioremediate 51% of Pb, 30% of Zn, and 22% of Cu through biosorption, possibly into the biofilm matrix. The bioremediating ability of the bacterium alleviated the inhibitory effect of heavy-metals on the germination of chickpea (Cicer arietinum L.) seeds. 16S rRNA gene-based phylogenetic analysis revealed that BirBP01 is a member of the genus Micrococcus. It showed more than 99% identity of the 16S rRNA gene sequence, and clustered within the same branch of the phylogenetic tree, with strains of M. yunnanensis, M. endophyticus, and M. luteus. The ability to produce amylase, and bioremediate heavy-metals signify that Micrococcus sp. BirBP01 could be potentially a good candidate for industrial applications, and to clean up heavy-metal contaminated sites.
    MeSH term(s) Micrococcus/genetics ; Micrococcus/metabolism ; Soil ; RNA, Ribosomal, 16S/genetics ; Phylogeny ; Metals, Heavy/metabolism ; Bacteria/genetics ; Biofilms ; Soil Pollutants/metabolism ; Biodegradation, Environmental
    Chemical Substances Soil ; RNA, Ribosomal, 16S ; Metals, Heavy ; Soil Pollutants
    Language English
    Publishing date 2023-10-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 124824-8
    ISSN 1432-072X ; 0302-8933
    ISSN (online) 1432-072X
    ISSN 0302-8933
    DOI 10.1007/s00203-023-03690-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Antibacterial, antibiofilm and larvicidal activity of silver nanoparticles synthesized from spider silk protein.

    Mondal, Anupam / Maity, Suprity / Mondal, Arghadip / Mondal, Naba Kumar

    International journal of biological macromolecules

    2023  Volume 258, Issue Pt 1, Page(s) 128775

    Abstract: Green synthesis of silver nanoparticles has gained attention due to its simple process of synthesis and varied applications. Scientists have tried its synthesis from a wide range of materials, but there is lack of reports that can use the metabolites of ... ...

    Abstract Green synthesis of silver nanoparticles has gained attention due to its simple process of synthesis and varied applications. Scientists have tried its synthesis from a wide range of materials, but there is lack of reports that can use the metabolites of insects. Here in this study, we have used the spider silk protein which is considered as complete waste collected from household and field sources and processed to synthesize silver nanoparticles which were subsequently analyzed using different analytical tools like SEM, TEM, FTIR, and XRD. The spider silk protein-mediated synthesized nanoparticle (SP-AgNPs) showed a sharp peak at 420 nm when analyzed spectrophotometrically giving an indication of successful synthesis of AgNP. The synthesized nanoparticle ranges from 10 to 40 nm and were of varied shapes. The synthesized SP-AgNPs showed remarkable antibacterial activity. The MIC values against B. subtilis and E. coli were recorded 45 and 40 μg/mL respectively. Further to know the mechanisms of antibacterial activity protein leakage and conductivity measurement were conducted. The synthesized nanoparticle also showed excellent antibiofilm activity with inhibition percentages of 74 % and 68 % for E. coli and B. subtilis respectively at MIC concentration of the treatment. Finally, the synthesized nanoparticles was applied as mosquito larvicidal agent against Culex sp. and the difference between LC
    MeSH term(s) Animals ; Anti-Bacterial Agents/pharmacology ; Biofilms ; Escherichia coli ; Insecticides/pharmacology ; Larva ; Metal Nanoparticles ; Silk/chemistry ; Silver/pharmacology ; Culex
    Chemical Substances Anti-Bacterial Agents ; Insecticides ; Silk ; Silver (3M4G523W1G)
    Language English
    Publishing date 2023-12-13
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2023.128775
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Nucleosome breathing facilitates cooperative binding of pluripotency factors Sox2 and Oct4 to DNA.

    Mondal, Anupam / Mishra, Sujeet Kumar / Bhattacherjee, Arnab

    Biophysical journal

    2022  Volume 121, Issue 23, Page(s) 4526–4542

    Abstract: Critical lineage commitment events are staged by multiple transcription factors (TFs) binding to their cognate motifs, often positioned at nucleosome-enriched regions of chromatin. The underlying mechanism remains elusive due to difficulty in ... ...

    Abstract Critical lineage commitment events are staged by multiple transcription factors (TFs) binding to their cognate motifs, often positioned at nucleosome-enriched regions of chromatin. The underlying mechanism remains elusive due to difficulty in disentangling the heterogeneity in chromatin states. Using a novel coarse-grained model and molecular dynamics simulations, here we probe the association of Sox2 and Oct4 proteins that show clustered binding at the entry-exit region of a nucleosome. The model captures the conformational heterogeneity of nucleosome breathing dynamics that features repeated wrap-unwrap transitions of a DNA segment from one end of the nucleosome. During the dynamics, DNA forms bulges that diffuse stochastically and may regulate the target search dynamics of a protein by nonspecifically interacting with it. The overall search kinetics of the TF pair follows a "dissociation-compensated-association" mechanism, where Oct4 binding is facilitated by the association of Sox2. The cooperativity stems from a change in entropy caused by an alteration in the nucleosome dynamics upon TF binding. The binding pattern is consistent with a live-cell single-particle tracking experiment, suggesting the mechanism observed for clustered binding of a TF pair, which is a hallmark of cis-regulatory elements, has broader implications in understanding gene regulation in a complex chromatin environment.
    MeSH term(s) Nucleosomes ; DNA
    Chemical Substances Nucleosomes ; DNA (9007-49-2)
    Language English
    Publishing date 2022-11-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 218078-9
    ISSN 1542-0086 ; 0006-3495
    ISSN (online) 1542-0086
    ISSN 0006-3495
    DOI 10.1016/j.bpj.2022.10.039
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Mechanism of Dynamic Binding of Replication Protein A to ssDNA.

    Mondal, Anupam / Bhattacherjee, Arnab

    Journal of chemical information and modeling

    2020  Volume 60, Issue 10, Page(s) 5057–5069

    Abstract: Replication protein A (RPA) serves as a hub protein inside eukaryotic cells, where it coordinates crucial DNA metabolic processes and activates the DNA-damage response system. A characteristic feature of its action is to associate with single-stranded ... ...

    Abstract Replication protein A (RPA) serves as a hub protein inside eukaryotic cells, where it coordinates crucial DNA metabolic processes and activates the DNA-damage response system. A characteristic feature of its action is to associate with single-stranded DNA (ssDNA) intermediates before handing them over to downstream proteins. The length of ssDNA intermediates differs for different pathways. This means that RPA must have mechanisms for selective processing of ssDNA intermediates based on their length, the knowledge of which is fundamental to elucidate when and how DNA repair and replication processes are symphonized. By employing extensive molecular dynamics simulations, we investigated the mechanism of binding of RPA to ssDNA of different lengths. We show that the binding involves dynamic equilibrium with a stable intermediate, the population of which increases with the length of ssDNA. The vital underlying factors are decoded through collective variable principal component analysis. It suggests a differently orchestrated set of interactions that define the action of RPA based on the length of ssDNA intermediates. We further estimated the association kinetics that matches excellently well with previous experimental studies and probed the diffusion mechanism of RPA to ssDNA. RPA diffuses on short ssDNA through progressive "bulge" formation. With long ssDNA, we observed a conformational change in ssDNA coupled with its binding to RPA in a cooperative fashion. This unanticipated binding mechanism successfully explains how the "short-lived", long ssDNA intermediates are processed quickly in vivo. This study thus reveals the molecular basis of several recent experimental observations related to RPA binding to ssDNA and provides novel insights into the RPA functioning in DNA repair and replication.
    MeSH term(s) DNA Repair ; DNA Replication ; DNA, Single-Stranded ; Protein Binding ; Replication Protein A/genetics ; Replication Protein A/metabolism
    Chemical Substances DNA, Single-Stranded ; Replication Protein A
    Language English
    Publishing date 2020-10-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 190019-5
    ISSN 1549-960X ; 0095-2338
    ISSN (online) 1549-960X
    ISSN 0095-2338
    DOI 10.1021/acs.jcim.0c00564
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