LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 389

Search options

  1. Article ; Online: Chemical targeting of G-quadruplexes in telomeres and beyond for molecular cancer therapeutics.

    Seimiya, Hiroyuki / Nagasawa, Kazuo / Shin-Ya, Kazuo

    The Journal of antibiotics

    2021  Volume 74, Issue 10, Page(s) 617–628

    Abstract: G-quadruplexes (G4s) are higher-order structures formed by guanine-rich sequences of nucleic acids, such as the telomeric 5'-TTAGGG-3'/5'-UUAGGG-3' repeats and those in gene regulatory regions. G4s regulate various biological events, including ... ...

    Abstract G-quadruplexes (G4s) are higher-order structures formed by guanine-rich sequences of nucleic acids, such as the telomeric 5'-TTAGGG-3'/5'-UUAGGG-3' repeats and those in gene regulatory regions. G4s regulate various biological events, including replication, transcription, and translation. Imbalanced G4 dynamics is associated with diseases, such as cancer and neurodegenerative diseases. Telomestatin is a natural macrocyclic compound derived from Streptomyces anulatus 3533-SV4. It interacts with the guanine quartet via π-π stacking and potently stabilizes G4. Because G4 stabilization at the telomeric repeat inhibits the telomere-synthesizing enzyme telomerase, telomestatin was originally identified as a telomerase inhibitor. Whereas non-toxic doses of telomestatin induce gradual shortening of telomeres and eventual crisis in human cancer cells, higher doses trigger prompt replication stress and DNA damage responses, resulting in acute cell death. Suppression of the transcription and translation of G4-containing genes is also implicated in the anticancer effects of telomestatin. Because telomestatin is rare, labile, and insoluble, synthetic oxazole telomestatin derivatives have been developed and verified for their therapeutic efficacies in preclinical cancer models. Furthermore, a variety of G4-stabilizing compounds have been reported as promising seeds for molecular cancer therapeutics. To improve the design of future clinical studies, it will be important to identify predictive biomarkers of drug efficacy.
    MeSH term(s) Animals ; Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Drug Delivery Systems ; G-Quadruplexes ; Humans ; Neoplasms/drug therapy ; Telomere
    Chemical Substances Antineoplastic Agents
    Language English
    Publishing date 2021-07-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 390800-8
    ISSN 1881-1469 ; 0021-8820 ; 0368-3532
    ISSN (online) 1881-1469
    ISSN 0021-8820 ; 0368-3532
    DOI 10.1038/s41429-021-00454-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: In Vitro Module Editing Of NRPS Enables Production Of Highly Potent G

    Hashimoto, Takuya / Suenaga, Hikaru / Amagai, Keita / Hashimoto, Junko / Kozone, Ikuko / Takahashi, Shunji / Shin-Ya, Kazuo

    Angewandte Chemie (International ed. in English)

    2024  Volume 63, Issue 10, Page(s) e202317805

    Abstract: Heterotrimeric G proteins are key mediators in the signaling of G protein-coupled receptors (GPCR) that are involved in a plethora of important physiological processes and thus major targets of pharmaceutical drugs. The cyclic depsipeptides YM-254890 and ...

    Abstract Heterotrimeric G proteins are key mediators in the signaling of G protein-coupled receptors (GPCR) that are involved in a plethora of important physiological processes and thus major targets of pharmaceutical drugs. The cyclic depsipeptides YM-254890 and FR900359 are strong and selective inhibitors of the G
    MeSH term(s) GTP-Binding Protein alpha Subunits, Gq-G11/metabolism ; Depsipeptides/chemistry ; Receptors, G-Protein-Coupled/metabolism ; Antineoplastic Agents
    Chemical Substances FR900359 ; GTP-Binding Protein alpha Subunits, Gq-G11 (EC 3.6.5.1) ; Depsipeptides ; Receptors, G-Protein-Coupled ; Antineoplastic Agents
    Language English
    Publishing date 2024-02-02
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202317805
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Carrier Protein Mediated Formation of the Dihydropyridazinone Ring in Actinopyridazinone Biosynthesis.

    Arima, Kuga / Akiyama, Satoko / Shin-Ya, Kazuo / Matsuda, Kenichi / Wakimoto, Toshiyuki

    Angewandte Chemie (International ed. in English)

    2023  Volume 62, Issue 29, Page(s) e202305155

    Abstract: Heterocycles with nitrogen-nitrogen (N-N) bonds are privileged building blocks of synthetic drugs. They are also found in natural products, although the biosynthetic logic behind them is poorly understood. Actinopyridazinones produced by Streptomyces sp. ...

    Abstract Heterocycles with nitrogen-nitrogen (N-N) bonds are privileged building blocks of synthetic drugs. They are also found in natural products, although the biosynthetic logic behind them is poorly understood. Actinopyridazinones produced by Streptomyces sp. MSD090630SC-05 possess unique dihydropyridazinone rings that have been studied as core nuclei in several approved synthetic therapeutics. Herein, we performed gene knockouts and in vitro biochemical experiments to elucidate the major steps in actinopyridazinone biosynthesis, including the unprecedented carrier protein mediated machinery for dihydropyridazinone formation.
    MeSH term(s) Carrier Proteins/metabolism ; Streptomyces/metabolism ; Biological Products/chemistry ; Nitrogen/metabolism ; Multigene Family
    Chemical Substances Carrier Proteins ; Biological Products ; Nitrogen (N762921K75)
    Language English
    Publishing date 2023-06-06
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202305155
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Identification of the Cirratiomycin Biosynthesis Gene Cluster in Streptomyces Cirratus: Elucidation of the Biosynthetic Pathways for 2,3-Diaminobutyric Acid and Hydroxymethylserine.

    Sakata, Shunki / Li, Jiafeng / Yasuno, Yoko / Shinada, Tetsuro / Shin-Ya, Kazuo / Katsuyama, Yohei / Ohnishi, Yasuo

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2024  , Page(s) e202400271

    Abstract: Cirratiomycin, a heptapeptide with antibacterial activity, was isolated and characterized in 1981; however, its biosynthetic pathway has not been elucidated. It contains several interesting nonproteinogenic amino acids, such as (2S,3S)-2,3-diaminobutyric ...

    Abstract Cirratiomycin, a heptapeptide with antibacterial activity, was isolated and characterized in 1981; however, its biosynthetic pathway has not been elucidated. It contains several interesting nonproteinogenic amino acids, such as (2S,3S)-2,3-diaminobutyric acid ((2S,3S)-DABA) and α-(hydroxymethyl)serine, as building blocks. Here, we report the identification of a cirratiomycin biosynthetic gene cluster in Streptomyces cirratus. Bioinformatic analysis revealed that several Streptomyces viridifaciens and Kitasatospora aureofaciens strains also have this cluster. One S. viridifaciens strain was confirmed to produce cirratiomycin. The biosynthetic gene cluster was shown to be responsible for cirratiomycin biosynthesis in S. cirratus in a gene inactivation experiment using CRISPR-cBEST. Interestingly, this cluster encodes a nonribosomal peptide synthetase (NRPS) composed of 12 proteins, including those with an unusual domain organization: a stand-alone adenylation domain, two stand-alone condensation domains, two type II thioesterases, and two NRPS modules that have no adenylation domain. Using heterologous expression and in vitro analysis of recombinant enzymes, we revealed the biosynthetic pathway of (2S,3S)-DABA: (2S,3S)-DABA is synthesized from l-threonine by four enzymes, CirR, CirS, CirQ, and CirB. In addition, CirH, a glycine/serine hydroxymethyltransferase homolog, was shown to synthesize α-(hydroxymethyl)serine from d-serine in vitro. These findings broaden our knowledge of nonproteinogenic amino acid biosynthesis.
    Language English
    Publishing date 2024-03-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202400271
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: $$\textrm{O}^+$$ O + density distribution in the nightside ionosphere reconstructed from ISS-IMAP/EUVI data

    Shin’ya Nakano / Yuta Hozumi / Akinori Saito / Ichiro Yoshikawa / Atsushi Yamazaki / Kazuo Yoshioka / Go Murakami

    Earth, Planets and Space, Vol 76, Iss 1, Pp 1-

    2024  Volume 18

    Abstract: Abstract The $$\textrm{O}^+$$ O + density distribution in the nightside ionosphere has been reconstructed from extreme ultraviolet (EUV) images taken by the EUVI-B imager of the International Space Station Ionosphere, Mesosphere, upper Atmosphere, and ... ...

    Abstract Abstract The $$\textrm{O}^+$$ O + density distribution in the nightside ionosphere has been reconstructed from extreme ultraviolet (EUV) images taken by the EUVI-B imager of the International Space Station Ionosphere, Mesosphere, upper Atmosphere, and Plasmasphere mapping (ISS-IMAP) cameras. The EUVI-B imager covers the wavelength range from about 70 nm to 110 nm and mainly observes the 91.1 nm emission from the recombination of $$\textrm{O}^+$$ O + ions and electrons. Assuming that the electron density is equal to the $$\textrm{O}^+$$ O + density in the F-region where the imager observes, the EUV intensity observed by EUVI-B is approximately proportional to the line-of-sight integral of the square of the $$\textrm{O}^+$$ O + density. This enables us to estimate the $$\textrm{O}^+$$ O + density distribution in the F-region from a sequence of EUVI-B data in each International Space Station (ISS) orbit with a Bayesian method. We demonstrate the reconstruction of the $$\textrm{O}^+$$ O + distribution. In particular, the $$\textrm{O}^+$$ O + density structure of the equatorial ionization anomaly (EIA) in the vicinity of an ISS orbit is obtained. Graphical Abstract
    Keywords $$\textrm{O}^+$$ O + ion distribution ; Ionosphere ; Extreme ultraviolet measurement ; Geography. Anthropology. Recreation ; G ; Geodesy ; QB275-343 ; Geology ; QE1-996.5
    Subject code 541
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher SpringerOpen
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  6. Article ; Online: Notch activator cyclopiazonic acid induces apoptosis in HL-60 cells through calcineurin activation.

    Suzuki, Shiina / Saito, Shun / Narushima, Yuki / Kodani, Shunta / Kagaya, Noritaka / Suenaga, Hikaru / Shin-Ya, Kazuo / Arai, Midori A

    The Journal of antibiotics

    2023  Volume 77, Issue 1, Page(s) 30–38

    Abstract: We screened a library of microbial extracts and compounds library using our constructed assay cells and found pulicatins F (1) and G (2), and cyclopiazonic acid (CPA) (3) as Notch activators. Pulicatin F (1) and (±)-pulicatin G were synthesized and their ...

    Abstract We screened a library of microbial extracts and compounds library using our constructed assay cells and found pulicatins F (1) and G (2), and cyclopiazonic acid (CPA) (3) as Notch activators. Pulicatin F (1) and (±)-pulicatin G were synthesized and their activities were evaluated. Notch activation of CPA (3) was investigated using Western blot and RT-PCR. CPA (3) increased protein level of HES1 and mRNA expression of HES1. Also, the expression of FMS-like tyrosine kinase 3 (FLT3), which was known to inhibit apoptosis, was also inhibited by CPA (3) addition. The Notch activation by CPA (3) and cytotoxicity against HL-60 were clearly canceled by addition of FK506, which is an inhibitor of calcineurin (CaN). In addition, it was revealed that CPA (3) induced apoptosis in HL-60 cells.
    MeSH term(s) Humans ; HL-60 Cells ; Calcineurin ; Apoptosis ; Indoles/pharmacology
    Chemical Substances Calcineurin (EC 3.1.3.16) ; cyclopiazonic acid (X9TLY4580Z) ; Indoles
    Language English
    Publishing date 2023-11-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 390800-8
    ISSN 1881-1469 ; 0021-8820 ; 0368-3532
    ISSN (online) 1881-1469
    ISSN 0021-8820 ; 0368-3532
    DOI 10.1038/s41429-023-00673-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Bacterial Avenalumic Acid Biosynthesis Includes Substitution of an Aromatic Amino Group for Hydride by Nitrous Acid Dependent Diazotization.

    Kawai, Seiji / Hagihara, Ryota / Shin-Ya, Kazuo / Katsuyama, Yohei / Ohnishi, Yasuo

    Angewandte Chemie (International ed. in English)

    2022  Volume 61, Issue 45, Page(s) e202211728

    Abstract: The diazo group is an important functional group that can confer biological activity to natural products owing to its high reactivity. Recent studies have revealed that diazo groups are synthesized from amino groups using nitrous acid in secondary ... ...

    Abstract The diazo group is an important functional group that can confer biological activity to natural products owing to its high reactivity. Recent studies have revealed that diazo groups are synthesized from amino groups using nitrous acid in secondary metabolites of actinomycetes. However, genome database analysis indicated that there are still many diazo group-biosynthesizing enzymes for unknown biosynthetic pathways. Here, we discovered an avenalumic acid biosynthesis gene cluster in Streptomyces sp. RI-77 by genome mining of enzymes involved in diazo group formation. Through heterologous expression, the gene cluster was revealed to direct avenalumic acid (AVA) biosynthesis via 3-aminoavenalumic acid (3-AAA). In vitro enzyme assays showed that AvaA6 and AvaA7 catalyzed the diazotization of 3-AAA using nitrous acid and substitution of the diazo group for hydride to synthesize AVA, respectively. This study revealed an unprecedented pathway for amino group removal via diazotization.
    MeSH term(s) Nitrous Acid/metabolism ; Streptomyces/metabolism ; Biosynthetic Pathways/genetics ; Multigene Family ; Biological Products/metabolism ; Bacterial Proteins/metabolism
    Chemical Substances Nitrous Acid (T2I5UM75DN) ; Biological Products ; Bacterial Proteins
    Language English
    Publishing date 2022-10-07
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202211728
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Acyltransferase Domain Exchange between Two Independent Type I Polyketide Synthases in the Same Producer Strain of Macrolide Antibiotics.

    Kudo, Fumitaka / Kishikawa, Kosuke / Tsuboi, Kazuma / Kido, Takafusa / Usui, Takeo / Hashimoto, Junko / Shin-Ya, Kazuo / Miyanaga, Akimasa / Eguchi, Tadashi

    Chembiochem : a European journal of chemical biology

    2023  Volume 24, Issue 6, Page(s) e202200670

    Abstract: Streptomyces graminofaciens A-8890 produces two macrolide antibiotics, FD-891 and virustomycin A, both of which show significant biological activity. In this study, we identified the virustomycin A biosynthetic gene cluster, which encodes type I ... ...

    Abstract Streptomyces graminofaciens A-8890 produces two macrolide antibiotics, FD-891 and virustomycin A, both of which show significant biological activity. In this study, we identified the virustomycin A biosynthetic gene cluster, which encodes type I polyketide synthases (PKSs), ethylmalonyl-CoA biosynthetic enzymes, methoxymalony-acyl carrier protein biosynthetic enzymes, and post-PKS modification enzymes. Next, we demonstrated that the acyltransferase domain can be exchanged between the Vsm PKSs and the PKSs involved in FD-891 biosynthesis (Gfs PKSs), without any supply problems of the unique extender units. We exchanged the malonyltransferase domain in the loading module of Gfs PKS with the ethylmalonyltransferase domain and the methoxymalonyltransferase domain of Vsm PKSs. Consequently, the expected two-carbon-elongated analog 26-ethyl-FD-891 was successfully produced with a titer comparable to FD-891 production by the wild type; however, exchange with the methoxymalonyltransferase domain did not produce any FD-891 analogs. Furthermore, 26-ethyl-FD-891 showed potent cytotoxic activity against HeLa cells, like natural FD-891.
    MeSH term(s) Humans ; Polyketide Synthases/genetics ; Polyketide Synthases/metabolism ; Acyltransferases/genetics ; Acyltransferases/metabolism ; HeLa Cells ; Macrolides/pharmacology ; Macrolides/metabolism ; Anti-Bacterial Agents/pharmacology
    Chemical Substances Polyketide Synthases (79956-01-7) ; virustomycin A (84777-85-5) ; FD 891 (142383-53-7) ; Acyltransferases (EC 2.3.-) ; Macrolides ; Anti-Bacterial Agents
    Language English
    Publishing date 2023-02-09
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2020469-3
    ISSN 1439-7633 ; 1439-4227
    ISSN (online) 1439-7633
    ISSN 1439-4227
    DOI 10.1002/cbic.202200670
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Collagen Lattice Model, Populated with Heterogeneous Cancer-Associated Fibroblasts, Facilitates Advanced Reconstruction of Pancreatic Cancer Microenvironment.

    Song, Xiaoyu / Nihashi, Yuma / Imai, Yukiko / Mori, Nobuhito / Kagaya, Noritaka / Suenaga, Hikaru / Shin-Ya, Kazuo / Yamamoto, Masamichi / Setoyama, Daiki / Kunisaki, Yuya / Kida, Yasuyuki S

    International journal of molecular sciences

    2024  Volume 25, Issue 7

    Abstract: Pancreatic ductal adenocarcinoma (PDAC) is a solid-tumor malignancy. To enhance the treatment landscape of PDAC, a 3D model optimized for rigorous drug screening is essential. Within the PDAC tumor microenvironment, a dense stroma comprising a large ... ...

    Abstract Pancreatic ductal adenocarcinoma (PDAC) is a solid-tumor malignancy. To enhance the treatment landscape of PDAC, a 3D model optimized for rigorous drug screening is essential. Within the PDAC tumor microenvironment, a dense stroma comprising a large extracellular matrix and cancer-associated fibroblasts (CAFs) is well-known for its vital role in modulating tumor growth, cellular heterogeneity, bidirectional paracrine signaling, and chemoresistance. In this study, we employed a fibroblast-populated collagen lattice (FPCL) modeling approach that has the ability to replicate fibroblast contractility in the collagenous matrix to build dense stroma. This FPCL model allows CAF differentiation by facilitating multifaceted cell-cell interactions between cancer cells and CAFs, with the differentiation further influenced by mechanical forces and hypoxia carried within the 3D structure. Our FPCL models displayed hallmark features, including ductal gland structures and differentiated CAFs with spindle shapes. Through morphological explorations alongside in-depth transcriptomic and metabolomic profiling, we identified substantial molecular shifts from the nascent to mature model stages and potential metabolic biomarkers, such as proline. The initial pharmacological assays highlighted the effectiveness of our FPCL model in screening for improved therapeutic strategies. In conclusion, our PDAC modeling platform mirrors complex tumor microenvironmental dynamics and offers an unparalleled perspective for therapeutic exploration.
    MeSH term(s) Humans ; Tumor Microenvironment ; Cancer-Associated Fibroblasts ; Pancreas ; Pancreatic Hormones ; Collagen ; Pancreatic Neoplasms ; Carcinoma, Pancreatic Ductal
    Chemical Substances Pancreatic Hormones ; Collagen (9007-34-5)
    Language English
    Publishing date 2024-03-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms25073740
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Capability of a large bacterial artificial chromosome clone harboring multiple biosynthetic gene clusters for the production of diverse compounds.

    Kudo, Kei / Nishimura, Takehiro / Izumikawa, Miho / Kozone, Ikuko / Hashimoto, Junko / Fujie, Manabu / Suenaga, Hikaru / Ikeda, Haruo / Satoh, Nori / Shin-Ya, Kazuo

    The Journal of antibiotics

    2024  Volume 77, Issue 5, Page(s) 288–298

    Abstract: The biosynthetic gene clusters (BGCs) for the macrocyclic lactone-based polyketide compounds are extremely large-sized because the polyketide synthases that generate the polyketide chains of the basic backbone are of very high molecular weight. In ... ...

    Abstract The biosynthetic gene clusters (BGCs) for the macrocyclic lactone-based polyketide compounds are extremely large-sized because the polyketide synthases that generate the polyketide chains of the basic backbone are of very high molecular weight. In developing a heterologous expression system for the large BGCs amenable to the production of such natural products, we selected concanamycin as an appropriate target. We obtained a bacterial artificial chromosome (BAC) clone with a 211-kb insert harboring the entire BGC responsible for the biosynthesis of concanamycin. Heterologous expression of this clone in a host strain, Streptomyces avermitilis SUKA32, permitted the production of concanamycin, as well as that of two additional aromatic polyketides. Structural elucidation identified these additional products as ent-gephyromycin and a novel compound that was designated JBIR-157. We describe herein sequencing and expression studies performed on these BGCs, demonstrating the utility of large BAC clones for the heterologous expression of cryptic or near-silent loci.
    MeSH term(s) Streptomyces/genetics ; Streptomyces/metabolism ; Multigene Family ; Chromosomes, Artificial, Bacterial/genetics ; Cloning, Molecular ; Polyketide Synthases/genetics ; Polyketide Synthases/metabolism ; Polyketides/metabolism ; Biological Products/metabolism
    Chemical Substances Polyketide Synthases (79956-01-7) ; Polyketides ; Biological Products
    Language English
    Publishing date 2024-03-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 390800-8
    ISSN 1881-1469 ; 0021-8820 ; 0368-3532
    ISSN (online) 1881-1469
    ISSN 0021-8820 ; 0368-3532
    DOI 10.1038/s41429-024-00711-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top