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In-solution study of the lipid kinase PI4KB heteromeric protein complexes

Project goals

Large dynamic protein complexes cannot be studied by traditional protein crystallography due to their intrinsically disordered regions. Traditional NMR techniques are also not suitable due to their size. Phosphatidylinositol 4-kinase B (PI4KB), a kinase that generates phosphatidylinositol 4-phosphate (PI4P), a crucial molecule for the function of the Golgi forms several flexible protein heterocomplexes. It interacts with the small GTPase Rab11, with Golgi residing protein ACBD3 (Acyl-CoA binding domain containing 3) and with the scaffolding protein 14-3-3. Importantly, PI4KB is hijacked by viral protein 3A through the formation of a trimeric 3A:ACBD3:PI4KB protein complex. PI4KB is an essential enzyme regulated by various binding partners. The overarching goal of the proposal is to decipher the structural basis of PI4K regulation by their binding partners. We plan to employ small angle X-ray scattering (SAXS) and other biophysical methods to attain this goal.

Keywords

kinasestructural analysis lipidphosphatidylinositol 4-phosphatePI4KAPI4KBACBD314-3-3

Public support

  • Provider

    Czech Science Foundation

  • Programme

    Standard projects

  • Call for proposals

    Standardní projekty 21 (SGA0201700001)

  • Main participants

    Ústav organické chemie a biochemie AV ČR, v. v. i.

  • Contest type

    VS - Public tender

  • Contract ID

    17-05200S

Alternative language

  • Project name in Czech

    Studium hetoromerických komplexů lipid kinázy PI4KB v roztoku

  • Annotation in Czech

    Klasická krystalografická analýza není vhodnou metodou pro studium velkých dynamických proteinových komplexů, protože jsou flexibilní a obsahují vnitřně neuspořádané oblasti. Klasické NMR techniky se také nehodí kvůli jejich přílišné velikosti. Fosfatidylinositol 4-kináza B (PI4KB) je kináza, která syntetizuje fosfatidylinositol 4-fosfát (PI4P), minoritní, ale klíčový lipid pro funkci Golgiho systému. PI4KB tvoří několik flexibilních hetoromerických proteinových komplexů. Interaguje s malou GTPázou Rab11, s Golgi rezidenčním proteinem ACBD3 (Acyl-CoA binding domain containing 3) a s adaptorovým 14-3-3 proteinem. PI4KB je také “zneužívána“ mnoha viry. Ty kódují nestrukturní 3A protein, aby skrze vytvoření komplexu 3A:ACBD3:PI4KB použili PI4KB pro vlastní účely. PI4KB je esenciální enzym regulovaný různými vazebnými partnery. Hlavním cílem tohoto projektu je objasnění strukturních základů regulace PI4K kináz jejich vazebnými partnery. Pro dosažení tohoto cíle použijeme rozptyl paprsků X (SAXS), proteinovou krystalografii a další metody strukturní biologie.

Scientific branches

  • R&D category

    ZV - Basic research

  • CEP classification - main branch

    EB - Genetics and molecular biology

  • CEP - secondary branch

  • CEP - another secondary branch

  • 10603 - Genetics and heredity (medical genetics to be 3)
    10604 - Reproductive biology (medical aspects to be 3)
    10605 - Developmental biology
    10608 - Biochemistry and molecular biology
    10609 - Biochemical research methods
    30101 - Human genetics

Completed project evaluation

  • Provider evaluation

    U - Uspěl podle zadání (s publikovanými či patentovanými výsledky atd.)

  • Project results evaluation

    Overall goals and specific aims of the project were fulfilled. Assembly and structure of heterocomplexes of PI4KB with its regulatory partners and viral protein 3A were solved. Results were published in 4 high-quality journals.

Solution timeline

  • Realization period - beginning

    Jan 1, 2017

  • Realization period - end

    Dec 31, 2019

  • Project status

    U - Finished project

  • Latest support payment

    Apr 10, 2019

Data delivery to CEP

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

  • Data delivery code

    CEP20-GA0-GA-U/02:1

  • Data delivery date

    Jul 23, 2020

Finance

  • Total approved costs

    5,616 thou. CZK

  • Public financial support

    4,734 thou. CZK

  • Other public sources

    882 thou. CZK

  • Non public and foreign sources

    0 thou. CZK

Basic information

Recognised costs

5 616 CZK thou.

Public support

4 734 CZK thou.

84%


Provider

Czech Science Foundation

CEP

EB - Genetics and molecular biology

Solution period

01. 01. 2017 - 31. 12. 2019