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  1. Article ; Online: DNA-targeting short Argonautes complex with effector proteins for collateral nuclease activity and bacterial population immunity.

    Prostova, Maria / Kanevskaya, Anna / Panteleev, Vladimir / Lisitskaya, Lidia / Perfilova Tugaeva, Kristina V / Sluchanko, Nikolai N / Esyunina, Daria / Kulbachinskiy, Andrey

    Nature microbiology

    2024  

    Abstract: Two prokaryotic defence systems, prokaryotic Argonautes (pAgos) and CRISPR-Cas, detect and cleave invader nucleic acids using complementary guides and the nuclease activities of pAgo or Cas proteins. However, not all pAgos are active nucleases. A large ... ...

    Abstract Two prokaryotic defence systems, prokaryotic Argonautes (pAgos) and CRISPR-Cas, detect and cleave invader nucleic acids using complementary guides and the nuclease activities of pAgo or Cas proteins. However, not all pAgos are active nucleases. A large clade of short pAgos bind nucleic acid guides but lack nuclease activity, suggesting a different mechanism of action. Here we investigate short pAgos associated with a putative effector nuclease, NbaAgo from Novosphingopyxis baekryungensis and CmeAgo from Cupriavidus metallidurans. We show that these pAgos form a heterodimeric complex with co-encoded effector nucleases (short prokaryotic Argonaute, DNase and RNase associated (SPARDA)). RNA-guided target DNA recognition unleashes the nuclease activity of SPARDA leading to indiscriminate collateral cleavage of DNA and RNA. Activation of SPARDA by plasmids or phages results in degradation of cellular DNA and cell death or dormancy, conferring target-specific population protection and expanding the range of known prokaryotic immune systems.
    Language English
    Publishing date 2024-04-15
    Publishing country England
    Document type Journal Article
    ISSN 2058-5276
    ISSN (online) 2058-5276
    DOI 10.1038/s41564-024-01654-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effect of Betaine and Arginine on Interaction of αB-Crystallin with Glycogen Phosphorylase

    Eronina, Tatiana B / Mikhaylova, Valeriya V / Chebotareva, Natalia A / Tugaeva, Kristina V / Kurganov, Boris I

    International journal of molecular sciences

    2022  Volume 23, Issue 7

    Abstract: Protein-protein interactions (PPIs) play an important role in many biological processes in a living cell. Among them chaperone-client interactions are the most important. In this work PPIs of αB-crystallin and glycogen ... ...

    Abstract Protein-protein interactions (PPIs) play an important role in many biological processes in a living cell. Among them chaperone-client interactions are the most important. In this work PPIs of αB-crystallin and glycogen phosphorylase
    MeSH term(s) Arginine ; Betaine/pharmacology ; Crystallins ; Glycogen Phosphorylase ; Humans ; Molecular Chaperones/metabolism
    Chemical Substances Crystallins ; Molecular Chaperones ; Betaine (3SCV180C9W) ; Arginine (94ZLA3W45F) ; Glycogen Phosphorylase (EC 2.4.1.-)
    Language English
    Publishing date 2022-03-30
    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/ijms23073816
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Hierarchized phosphotarget binding by the seven human 14-3-3 isoforms.

    Gogl, Gergo / Tugaeva, Kristina V / Eberling, Pascal / Kostmann, Camille / Trave, Gilles / Sluchanko, Nikolai N

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 1677

    Abstract: The seven 14-3-3 isoforms are highly abundant human proteins encoded by similar yet distinct genes. 14-3-3 proteins recognize phosphorylated motifs within numerous human and viral proteins. Here, we analyze by X-ray crystallography, fluorescence ... ...

    Abstract The seven 14-3-3 isoforms are highly abundant human proteins encoded by similar yet distinct genes. 14-3-3 proteins recognize phosphorylated motifs within numerous human and viral proteins. Here, we analyze by X-ray crystallography, fluorescence polarization, mutagenesis and fusicoccin-mediated modulation the structural basis and druggability of 14-3-3 binding to four E6 oncoproteins of tumorigenic human papillomaviruses. 14-3-3 isoforms bind variant and mutated phospho-motifs of E6 and unrelated protein RSK1 with different affinities, albeit following an ordered affinity ranking with conserved relative K
    MeSH term(s) 14-3-3 Proteins/chemistry ; 14-3-3 Proteins/metabolism ; Amino Acid Sequence ; Crystallography, X-Ray ; Humans ; Papillomaviridae ; Phosphoproteins ; Phosphorylation ; Protein Binding ; Protein Isoforms/metabolism
    Chemical Substances 14-3-3 Proteins ; Phosphoproteins ; Protein Isoforms
    Language English
    Publishing date 2021-03-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-21908-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Crystal structure of human 14-3-3ζ complexed with the noncanonical phosphopeptide from proapoptotic BAD.

    Sluchanko, Nikolai N / Tugaeva, Kristina V / Gushchin, Ivan / Remeeva, Alina / Kovalev, Kirill / Cooley, Richard B

    Biochemical and biophysical research communications

    2021  Volume 583, Page(s) 100–105

    Abstract: Several signaling pathways control phosphorylation of the proapoptotic protein BAD and its phosphorylation-dependent association with 14-3-3 proteins in the cytoplasm. The stability of the 14-3-3/BAD complex determines the cell fate: unphosphorylated BAD ...

    Abstract Several signaling pathways control phosphorylation of the proapoptotic protein BAD and its phosphorylation-dependent association with 14-3-3 proteins in the cytoplasm. The stability of the 14-3-3/BAD complex determines the cell fate: unphosphorylated BAD escapes from 14-3-3, migrates to the mitochondria and initiates apoptosis. While the 14-3-3/BAD interaction represents a promising drug target, it lacks structural characterization. Among several phosphosites identified in vivo, Ser75 and Ser99 of human BAD match the consensus sequence RXXpSXP recognized by 14-3-3 and, therefore, represent canonical 14-3-3-binding sites. Yet, BAD contains other serines phosphorylatable in vivo, whose role is less understood. Here, we report a 2.36 Å crystal structure of 14-3-3ζ complexed with a BAD fragment which includes residues Ser74 and Ser75, both being substrates for protein kinases. While the BAD peptide is anchored to 14-3-3 by phosphoserine as expected, the BAD peptide was unexpectedly phosphorylated at Ser74 instead of Ser75, revealing noncanonical binding within the amphipathic groove and leading to a one-step positional shift and reorganization of the interface. This observation exemplifies plasticity of the amphipathic 14-3-3 groove in accommodating various peptides and suggests the redundancy of Ser74 and Ser75 phosphosites with respect to binding of BAD to 14-3-3.
    Language English
    Publishing date 2021-10-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2021.10.053
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Effect of Trehalose on Oligomeric State and Anti-Aggregation Activity of αB-Crystallin.

    Chebotareva, Natalia A / Eronina, Tatiana B / Mikhaylova, Valeriya V / Roman, Svetlana G / Tugaeva, Kristina V / Kurganov, Boris I

    Biochemistry. Biokhimiia

    2022  Volume 87, Issue 2, Page(s) 121–130

    Abstract: αB-Crystallin (αB-Cr), one of the main crystalline lens proteins, along with other crystallins maintains lens transparency suppressing protein aggregation and thus preventing cataractogenesis. αB-Cr belongs to the class of molecular chaperones; being ... ...

    Abstract αB-Crystallin (αB-Cr), one of the main crystalline lens proteins, along with other crystallins maintains lens transparency suppressing protein aggregation and thus preventing cataractogenesis. αB-Cr belongs to the class of molecular chaperones; being expressed in many tissues it has a dynamic quaternary structure, which is essential for its chaperone-like activity. Shift in the equilibrium between ensembles of oligomers of different size allows regulating the chaperone activity. Trehalose is known to inhibit protein aggregation in vivo and in vitro, and it is widely used in biotechnology. The results of studying the effect of trehalose on the chaperone-like activity of crystallins can serve as a basis for the design of drugs delaying cataractogenesis. We have studied the trehalose effect on the quaternary structure and anti-aggregation activity of αB-Cr using muscle glycogen phosphorylase b (Phb) as a target protein. According to the dynamic light scattering data, trehalose affects the nucleation stage of Phb thermal aggregation at 48°C, and an increase in the αB-Cr adsorption capacity (AC
    MeSH term(s) Crystallins/metabolism ; Molecular Chaperones/metabolism ; Protein Aggregates ; Protein Folding ; Trehalose/pharmacology ; alpha-Crystallin B Chain/metabolism
    Chemical Substances Crystallins ; Molecular Chaperones ; Protein Aggregates ; alpha-Crystallin B Chain ; Trehalose (B8WCK70T7I)
    Language English
    Publishing date 2022-05-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1109-5
    ISSN 1608-3040 ; 0006-2979 ; 0320-9717
    ISSN (online) 1608-3040
    ISSN 0006-2979 ; 0320-9717
    DOI 10.1134/S0006297922020043
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Human 14-3-3 Proteins Site-selectively Bind the Mutational Hotspot Region of SARS-CoV-2 Nucleoprotein Modulating its Phosphoregulation.

    Tugaeva, Kristina V / Sysoev, Andrey A / Kapitonova, Anna A / Smith, Jake L R / Zhu, Phillip / Cooley, Richard B / Antson, Alfred A / Sluchanko, Nikolai N

    Journal of molecular biology

    2022  Volume 435, Issue 2, Page(s) 167891

    Abstract: Phosphorylation of SARS-CoV-2 nucleoprotein recruits human cytosolic 14-3-3 proteins playing a well-recognized role in replication of many viruses. Here we use genetic code expansion to demonstrate that 14-3-3 binding is triggered by phosphorylation of ... ...

    Abstract Phosphorylation of SARS-CoV-2 nucleoprotein recruits human cytosolic 14-3-3 proteins playing a well-recognized role in replication of many viruses. Here we use genetic code expansion to demonstrate that 14-3-3 binding is triggered by phosphorylation of SARS-CoV-2 nucleoprotein at either of two pseudo-repeats centered at Ser197 and Thr205. According to fluorescence anisotropy measurements, the pT205-motif,presentin SARS-CoV-2 but not in SARS-CoV, is preferred over the pS197-motif by all seven human 14-3-3 isoforms, which collectively display an unforeseen pT205/pS197 peptide binding selectivity hierarchy. Crystal structures demonstrate that pS197 and pT205 are mutually exclusive 14-3-3-binding sites, whereas SAXS and biochemical data obtained on the full protein-protein complex indicate that 14-3-3 binding occludes the Ser/Arg-rich region of the nucleoprotein, inhibiting its dephosphorylation. This Ser/Arg-rich region is highly prone to mutations, as exemplified by the Omicron and Delta variants, with our data suggesting that the strength of 14-3-3/nucleoprotein interaction can be linked with the replicative fitness of the virus.
    MeSH term(s) Humans ; 14-3-3 Proteins/metabolism ; COVID-19/virology ; Mutation ; Nucleoproteins/genetics ; Nucleoproteins/metabolism ; SARS-CoV-2/genetics ; SARS-CoV-2/metabolism ; Scattering, Small Angle ; X-Ray Diffraction ; Coronavirus Nucleocapsid Proteins/genetics ; Coronavirus Nucleocapsid Proteins/metabolism
    Chemical Substances 14-3-3 Proteins ; Nucleoproteins ; nucleocapsid phosphoprotein, SARS-CoV-2 ; Coronavirus Nucleocapsid Proteins
    Language English
    Publishing date 2022-11-24
    Publishing country Netherlands
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2022.167891
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Structural basis for the recognition by 14-3-3 proteins of a conditional binding site within the oligomerization domain of human nucleophosmin.

    Kapitonova, Anna A / Tugaeva, Kristina V / Varfolomeeva, Larisa A / Boyko, Konstantin M / Cooley, Richard B / Sluchanko, Nikolai N

    Biochemical and biophysical research communications

    2022  Volume 627, Page(s) 176–183

    Abstract: Nucleophosmin 1 (NPM1) is a multifunctional protein regulating ribosome biogenesis, centrosome duplication and chromatin remodeling. Being a major nucleolar protein, NPM1 can migrate to the nucleus and the cytoplasm, which is controlled by changes of ... ...

    Abstract Nucleophosmin 1 (NPM1) is a multifunctional protein regulating ribosome biogenesis, centrosome duplication and chromatin remodeling. Being a major nucleolar protein, NPM1 can migrate to the nucleus and the cytoplasm, which is controlled by changes of NPM1 oligomerization and interaction with other cell factors. NPM1 forms a stable pentamer with its N-terminal structured domain, where two nuclear export signals and several phosphorylation sites reside. This domain undergoes dissociation and disordering upon Ser48 phosphorylation in the subunit interface. Recent studies indicated that Ser48 is important for NPM1 interaction with other proteins including 14-3-3, the well-known phosphoserine/phosphothreonine binders, but the structural basis for 14-3-3/NPM1 interaction remained unaddressed. By fusing human 14-3-3ζ with an NPM1 segment surrounding Ser48, which was phosphorylated inside Escherichia coli cells by co-expressed protein kinase A, here we obtained the desired protein/phosphopeptide complex and determined its crystal structure. While biochemical data indicated that the interaction is driven by Ser48 phosphorylation, the crystallographic 14-3-3/phosphopeptide interface reveals an NPM1 conformation distinctly different from that in the NPM1 pentamer. Given the canonical phosphopeptide-binding mode observed in our crystal structure, Ser48 emerges as a conditional binding site whose recognition by 14-3-3 proteins is enabled by NPM1 phosphorylation, disassembly and disordering under physiological circumstances.
    MeSH term(s) 14-3-3 Proteins/metabolism ; Binding Sites ; Humans ; Nuclear Proteins/metabolism ; Nucleophosmin ; Phosphopeptides
    Chemical Substances 14-3-3 Proteins ; Nuclear Proteins ; Phosphopeptides ; Nucleophosmin (117896-08-9)
    Language English
    Publishing date 2022-08-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2022.08.047
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Hierarchized phosphotarget binding by the seven human 14-3-3 isoforms

    Gergo Gogl / Kristina V. Tugaeva / Pascal Eberling / Camille Kostmann / Gilles Trave / Nikolai N. Sluchanko

    Nature Communications, Vol 12, Iss 1, Pp 1-

    2021  Volume 12

    Abstract: 14-3-3 proteins recognize phosphorylated motifs within numerous protein partners. Here, the authors characterize the binding of all human 14-3-3 isoforms to four E6 oncoproteins, and identify a fixed order of 14-3-3 binding affinities that is conserved ... ...

    Abstract 14-3-3 proteins recognize phosphorylated motifs within numerous protein partners. Here, the authors characterize the binding of all human 14-3-3 isoforms to four E6 oncoproteins, and identify a fixed order of 14-3-3 binding affinities that is conserved in 14-3-3:phosphoprotein interactions across the proteome.
    Keywords Science ; Q
    Language English
    Publishing date 2021-03-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Crystal structure reveals canonical recognition of the phosphorylated cytoplasmic loop of human alpha7 nicotinic acetylcholine receptor by 14-3-3 protein.

    Sluchanko, Nikolai N / Kapitonova, Anna A / Shulepko, Mikhail A / Kukushkin, Ilya D / Kulbatskii, Dmitrii S / Tugaeva, Kristina V / Varfolomeeva, Larisa A / Minyaev, Mikhail E / Boyko, Konstantin M / Popov, Vladimir O / Kirpichnikov, Mikhail P / Lyukmanova, Ekaterina N

    Biochemical and biophysical research communications

    2023  Volume 682, Page(s) 91–96

    Abstract: Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels composed of five homologous subunits. The homopentameric α7-nAChR, abundantly expressed in the brain, is involved in the regulation of the neuronal plasticity and memory and ... ...

    Abstract Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels composed of five homologous subunits. The homopentameric α7-nAChR, abundantly expressed in the brain, is involved in the regulation of the neuronal plasticity and memory and undergoes phosphorylation by protein kinase A (PKA). Here, we extracted native α7-nAChR from murine brain, validated its assembly by cryo-EM and showed that phosphorylation by PKA in vitro enables its interaction with the abundant human brain protein 14-3-3ζ. Bioinformatic analysis narrowed the putative 14-3-3-binding site down to the fragment of the intracellular loop (ICL) containing Ser365 (Q
    MeSH term(s) Animals ; Humans ; Mice ; 14-3-3 Proteins/metabolism ; alpha7 Nicotinic Acetylcholine Receptor/metabolism ; Binding Sites ; Cytoplasm/metabolism ; Receptors, Nicotinic/metabolism
    Chemical Substances 14-3-3 Proteins ; alpha7 Nicotinic Acetylcholine Receptor ; Receptors, Nicotinic ; Chrna7 protein, human
    Language English
    Publishing date 2023-09-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2023.09.086
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Design, expression, purification and crystallization of human 14-3-3ζ protein chimera with phosphopeptide from proapoptotic protein BAD.

    Tugaeva, Kristina V / Remeeva, Alina / Gushchin, Ivan / Cooley, Richard B / Sluchanko, Nikolai N

    Protein expression and purification

    2020  Volume 175, Page(s) 105707

    Abstract: 14-3-3 protein isoforms regulate multiple processes in eukaryotes, including apoptosis and cell division. 14-3-3 proteins preferentially recognize phosphorylated unstructured motifs, justifying the protein-peptide binding approach to study 14-3-3/ ... ...

    Abstract 14-3-3 protein isoforms regulate multiple processes in eukaryotes, including apoptosis and cell division. 14-3-3 proteins preferentially recognize phosphorylated unstructured motifs, justifying the protein-peptide binding approach to study 14-3-3/phosphotarget complexes. Tethering of human 14-3-3σ with partner phosphopeptides via a short linker has provided structural information equivalent to the use of synthetic phosphopeptides, simultaneously facilitating purification and crystallization. Nevertheless, the broader applicability to other 14-3-3 isoforms and phosphopeptides was unclear. Here, we designed a novel 14-3-3ζ chimera with a conserved phosphopeptide from BAD, whose complex with 14-3-3 is a gatekeeper of apoptosis regulation. The chimera could be bacterially expressed and purified without affinity tags. Co-expressed PKA efficiently phosphorylates BAD within the chimera and blocks its interaction with a known 14-3-3 phosphotarget, suggesting occupation of the 14-3-3 grooves by the tethered BAD phosphopeptide. Efficient crystallization of the engineered protein suggests suitability of the "chimeric" approach for studies of other relevant 14-3-3 complexes.
    MeSH term(s) 14-3-3 Proteins/biosynthesis ; 14-3-3 Proteins/chemistry ; 14-3-3 Proteins/genetics ; 14-3-3 Proteins/isolation & purification ; Crystallography, X-Ray ; Humans ; Protein Engineering ; Recombinant Fusion Proteins/biosynthesis ; Recombinant Fusion Proteins/chemistry ; Recombinant Fusion Proteins/genetics ; Recombinant Fusion Proteins/isolation & purification ; bcl-Associated Death Protein/biosynthesis ; bcl-Associated Death Protein/chemistry ; bcl-Associated Death Protein/genetics ; bcl-Associated Death Protein/isolation & purification
    Chemical Substances 14-3-3 Proteins ; BAD protein, human ; Recombinant Fusion Proteins ; YWHAZ protein, human ; bcl-Associated Death Protein
    Language English
    Publishing date 2020-07-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1055455-5
    ISSN 1096-0279 ; 1046-5928
    ISSN (online) 1096-0279
    ISSN 1046-5928
    DOI 10.1016/j.pep.2020.105707
    Database MEDical Literature Analysis and Retrieval System OnLINE

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