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  1. Artikel ; Online: Mechanism of Borrelia immune evasion by FhbA-related proteins.

    Konstantin Kogan / Karita Haapasalo / Tommi Kotila / Robin Moore / Pekka Lappalainen / Adrian Goldman / Taru Meri

    PLoS Pathogens, Vol 18, Iss 3, p e

    2022  Band 1010338

    Abstract: Immune evasion facilitates survival of Borrelia, leading to infections like relapsing fever and Lyme disease. Important mechanism for complement evasion is acquisition of the main host complement inhibitor, factor H (FH). By determining the 2.2 Å crystal ...

    Abstract Immune evasion facilitates survival of Borrelia, leading to infections like relapsing fever and Lyme disease. Important mechanism for complement evasion is acquisition of the main host complement inhibitor, factor H (FH). By determining the 2.2 Å crystal structure of Factor H binding protein A (FhbA) from Borrelia hermsii in complex with FH domains 19-20, combined with extensive mutagenesis, we identified the structural mechanism by which B. hermsii utilizes FhbA in immune evasion. Moreover, structure-guided sequence database analysis identified a new family of FhbA-related immune evasion molecules from Lyme disease and relapsing fever Borrelia. Conserved FH-binding mechanism within the FhbA-family was verified by analysis of a novel FH-binding protein from B. duttonii. By sequence analysis, we were able to group FH-binding proteins of Borrelia into four distinct phyletic types and identified novel putative FH-binding proteins. The conserved FH-binding mechanism of the FhbA-related proteins could aid in developing new approaches to inhibit virulence and complement resistance in Borrelia.
    Schlagwörter Immunologic diseases. Allergy ; RC581-607 ; Biology (General) ; QH301-705.5
    Sprache Englisch
    Erscheinungsdatum 2022-03-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Structural basis of rapid actin dynamics in the evolutionarily divergent Leishmania parasite

    Tommi Kotila / Hugo Wioland / Muniyandi Selvaraj / Konstantin Kogan / Lina Antenucci / Antoine Jégou / Juha T. Huiskonen / Guillaume Romet-Lemonne / Pekka Lappalainen

    Nature Communications, Vol 13, Iss 1, Pp 1-

    2022  Band 18

    Abstract: The authors report here the structure-function analysis of highly divergent actin from Leishmania parasite. The study reveals remarkably rapid dynamics of parasite actin as well as the underlying molecular basis, thus providing insight into evolution of ... ...

    Abstract The authors report here the structure-function analysis of highly divergent actin from Leishmania parasite. The study reveals remarkably rapid dynamics of parasite actin as well as the underlying molecular basis, thus providing insight into evolution of the actin cytoskeleton.
    Schlagwörter Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2022-06-01T00:00:00Z
    Verlag Nature Portfolio
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel ; Online: A functional family of fluorescent nucleotide analogues to investigate actin dynamics and energetics

    Jessica Colombo / Adrien Antkowiak / Konstantin Kogan / Tommi Kotila / Jenna Elliott / Audrey Guillotin / Pekka Lappalainen / Alphée Michelot

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

    2021  Band 13

    Abstract: Actin polymerization provides force for vital processes of the eukaryotic cell, but our understanding of actin dynamics and energetics remains limited due to the lack of high-quality probes. Here authors identify a family of highly sensitive fluorescent ... ...

    Abstract Actin polymerization provides force for vital processes of the eukaryotic cell, but our understanding of actin dynamics and energetics remains limited due to the lack of high-quality probes. Here authors identify a family of highly sensitive fluorescent nucleotide analogues which bind to actin and provide energy to power actin-based processes.
    Schlagwörter Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2021-01-01T00:00:00Z
    Verlag Nature Portfolio
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel ; Online: Mechanism of synergistic actin filament pointed end depolymerization by cyclase-associated protein and cofilin

    Tommi Kotila / Hugo Wioland / Giray Enkavi / Konstantin Kogan / Ilpo Vattulainen / Antoine Jégou / Guillaume Romet-Lemonne / Pekka Lappalainen

    Nature Communications, Vol 10, Iss 1, Pp 1-

    2019  Band 14

    Abstract: The cofilin family proteins are actin disassembly factors but the disassembly mechanism is poorly understood. Here authors show that cyclase-associated-protein (CAP) works in synergy with cofilin to accelerate actin filament depolymerization by nearly ... ...

    Abstract The cofilin family proteins are actin disassembly factors but the disassembly mechanism is poorly understood. Here authors show that cyclase-associated-protein (CAP) works in synergy with cofilin to accelerate actin filament depolymerization by nearly 100-fold and reveal how CAP destabilizes the interface between terminal actin subunits.
    Schlagwörter Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2019-11-01T00:00:00Z
    Verlag Nature Publishing Group
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel ; Online: Mechanism of synergistic actin filament pointed end depolymerization by cyclase-associated protein and cofilin

    Tommi Kotila / Hugo Wioland / Giray Enkavi / Konstantin Kogan / Ilpo Vattulainen / Antoine Jégou / Guillaume Romet-Lemonne / Pekka Lappalainen

    Nature Communications, Vol 10, Iss 1, Pp 1-

    2019  Band 14

    Abstract: The cofilin family proteins are actin disassembly factors but the disassembly mechanism is poorly understood. Here authors show that cyclase-associated-protein (CAP) works in synergy with cofilin to accelerate actin filament depolymerization by nearly ... ...

    Abstract The cofilin family proteins are actin disassembly factors but the disassembly mechanism is poorly understood. Here authors show that cyclase-associated-protein (CAP) works in synergy with cofilin to accelerate actin filament depolymerization by nearly 100-fold and reveal how CAP destabilizes the interface between terminal actin subunits.
    Schlagwörter Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2019-11-01T00:00:00Z
    Verlag Nature Portfolio
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel ; Online: Structural basis of actin monomer re-charging by cyclase-associated protein

    Tommi Kotila / Konstantin Kogan / Giray Enkavi / Siyang Guo / Ilpo Vattulainen / Bruce L. Goode / Pekka Lappalainen

    Nature Communications, Vol 9, Iss 1, Pp 1-

    2018  Band 12

    Abstract: Depolymerized ADP-actin monomers must be recharged with ATP for new rounds of filament assembly. Here the authors show that cyclase-associated protein (CAP) catalyzes actin nucleotide exchange in vivo and their CAP–actin complex structure reveals the ... ...

    Abstract Depolymerized ADP-actin monomers must be recharged with ATP for new rounds of filament assembly. Here the authors show that cyclase-associated protein (CAP) catalyzes actin nucleotide exchange in vivo and their CAP–actin complex structure reveals the molecular mechanism of CAP-mediated actin nucleotide exchange.
    Schlagwörter Science ; Q
    Sprache Englisch
    Erscheinungsdatum 2018-05-01T00:00:00Z
    Verlag Nature Portfolio
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel ; Online: Crystal structure of a tripartite complex between C3dg, C-terminal domains of factor H and OspE of Borrelia burgdorferi.

    Robert Kolodziejczyk / Kornelia M Mikula / Tommi Kotila / Vincent L G Postis / T Sakari Jokiranta / Adrian Goldman / Taru Meri

    PLoS ONE, Vol 12, Iss 11, p e

    2017  Band 0188127

    Abstract: Complement is an important part of innate immunity. The alternative pathway of complement is activated when the main opsonin, C3b coats non-protected surfaces leading to opsonisation, phagocytosis and cell lysis. The alternative pathway is tightly ... ...

    Abstract Complement is an important part of innate immunity. The alternative pathway of complement is activated when the main opsonin, C3b coats non-protected surfaces leading to opsonisation, phagocytosis and cell lysis. The alternative pathway is tightly controlled to prevent autoactivation towards host cells. The main regulator of the alternative pathway is factor H (FH), a soluble glycoprotein that terminates complement activation in multiple ways. FH recognizes host cell surfaces via domains 19-20 (FH19-20). All microbes including Borrelia burgdorferi, the causative agent of Lyme borreliosis, must evade complement activation to allow the infectious agent to survive in its host. One major mechanism that Borrelia uses is to recruit FH from host. Several outer surface proteins (Osp) have been described to bind FH via the C-terminus, and OspE is one of them. Here we report the structure of the tripartite complex formed by OspE, FH19-20 and C3dg at 3.18 Å, showing that OspE and C3dg can bind simultaneously to FH19-20. This verifies that FH19-20 interacts via the "common microbial binding site" on domain 20 with OspE and simultaneously and independently via domain 19 with C3dg. The spatial organization of the tripartite complex explains how OspE on the bacterial surface binds FH19-20, leaving FH fully available to protect the bacteria against complement. Additionally, formation of tripartite complex between FH, microbial protein and C3dg might enable enhanced protection, particularly on those regions on the bacteria where previous complement activation led to deposition of C3d. This might be especially important for slow-growing bacteria that cause chronic disease like Borrelia burgdorferi.
    Schlagwörter Medicine ; R ; Science ; Q
    Thema/Rubrik (Code) 572
    Sprache Englisch
    Erscheinungsdatum 2017-01-01T00:00:00Z
    Verlag Public Library of Science (PLoS)
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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