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- PDB-8dp0: Structure of p110 gamma bound to the Ras inhibitory nanobody NB7 -

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Basic information

Entry
Database: PDB / ID: 8dp0
TitleStructure of p110 gamma bound to the Ras inhibitory nanobody NB7
Components
  • Nanobody NB7
  • Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit gamma isoform
KeywordsTRANSFERASE/IMMUNE SYSTEM / PI3K / p110 / PIK3CG / phosphoinositide 3-kinase / PIP3 / TRANSFERASE-IMMUNE SYSTEM complex
Function / homology
Function and homology information


negative regulation of cardiac muscle contraction / negative regulation of triglyceride catabolic process / secretory granule localization / natural killer cell chemotaxis / neutrophil extravasation / phosphatidylinositol-4-phosphate 3-kinase / positive regulation of acute inflammatory response / respiratory burst involved in defense response / T cell chemotaxis / negative regulation of fibroblast apoptotic process ...negative regulation of cardiac muscle contraction / negative regulation of triglyceride catabolic process / secretory granule localization / natural killer cell chemotaxis / neutrophil extravasation / phosphatidylinositol-4-phosphate 3-kinase / positive regulation of acute inflammatory response / respiratory burst involved in defense response / T cell chemotaxis / negative regulation of fibroblast apoptotic process / phosphatidylinositol 3-kinase complex, class IB / regulation of calcium ion transmembrane transport / 1-phosphatidylinositol-4-phosphate 3-kinase activity / Co-stimulation by ICOS / sphingosine-1-phosphate receptor signaling pathway / phosphatidylinositol 3-kinase complex, class IA / phosphatidylinositol-3-phosphate biosynthetic process / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / phosphatidylinositol-4,5-bisphosphate 3-kinase / dendritic cell chemotaxis / phosphatidylinositol 3-kinase / 1-phosphatidylinositol-3-kinase activity / mast cell degranulation / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / hepatocyte apoptotic process / phosphatidylinositol-mediated signaling / regulation of cell adhesion mediated by integrin / phosphatidylinositol phosphate biosynthetic process / Synthesis of PIPs at the plasma membrane / positive regulation of Rac protein signal transduction / CD28 dependent PI3K/Akt signaling / regulation of angiogenesis / positive regulation of MAP kinase activity / T cell proliferation / GPVI-mediated activation cascade / ephrin receptor binding / cellular response to cAMP / neutrophil chemotaxis / positive regulation of endothelial cell migration / T cell activation / positive regulation of cytokine production / histone H4S1 kinase activity / histone H2BS14 kinase activity / histone H2AS121 kinase activity / histone H3S57 kinase activity / histone H3S28 kinase activity / histone H2AS1 kinase activity / histone H3T6 kinase activity / ribosomal protein S6 kinase activity / histone H2AT120 kinase activity / eukaryotic translation initiation factor 2alpha kinase activity / histone H2BS36 kinase activity / Rho-dependent protein serine/threonine kinase activity / histone H3S10 kinase activity / AMP-activated protein kinase activity / histone H3T11 kinase activity / histone H3T3 kinase activity / 3-phosphoinositide-dependent protein kinase activity / histone H3T45 kinase activity / DNA-dependent protein kinase activity / histone H2AXS139 kinase activity / phosphatidylinositol 3-kinase/protein kinase B signal transduction / platelet aggregation / endocytosis / Constitutive Signaling by Aberrant PI3K in Cancer / G beta:gamma signalling through PI3Kgamma / cell migration / PIP3 activates AKT signaling / positive regulation of cytosolic calcium ion concentration / PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling / angiogenesis / phospholipase C-activating G protein-coupled receptor signaling pathway / adaptive immune response / non-specific serine/threonine protein kinase / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / protein kinase activity / immune response / G protein-coupled receptor signaling pathway / inflammatory response / innate immune response / protein serine kinase activity / ATP binding / identical protein binding / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
PIK3 catalytic subunit gamma, adaptor-binding domain / PIK3 catalytic subunit gamma adaptor-binding domain / Phosphatidylinositol 3-kinase, adaptor-binding domain / Phosphatidylinositol 3-kinase adaptor-binding (PI3K ABD) domain profile. / PI3-kinase family, Ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain / PI3-kinase family, ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain profile. / C2 phosphatidylinositol 3-kinase-type domain / Phosphoinositide 3-kinase C2 ...PIK3 catalytic subunit gamma, adaptor-binding domain / PIK3 catalytic subunit gamma adaptor-binding domain / Phosphatidylinositol 3-kinase, adaptor-binding domain / Phosphatidylinositol 3-kinase adaptor-binding (PI3K ABD) domain profile. / PI3-kinase family, Ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain / PI3-kinase family, ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain profile. / C2 phosphatidylinositol 3-kinase-type domain / Phosphoinositide 3-kinase C2 / C2 phosphatidylinositol 3-kinase (PI3K)-type domain profile. / Phosphoinositide 3-kinase, region postulated to contain C2 domain / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / Phosphoinositide 3-kinase, accessory (PIK) domain superfamily / Phosphoinositide 3-kinase, accessory (PIK) domain / Phosphatidylinositol kinase / PIK helical domain profile. / Phosphatidylinositol 3- and 4-kinases signature 1. / Phosphatidylinositol 3/4-kinase, conserved site / Phosphatidylinositol 3- and 4-kinases signature 2. / Phosphatidylinositol 3-/4-kinase, catalytic domain superfamily / Phosphoinositide 3-kinase, catalytic domain / Phosphatidylinositol 3- and 4-kinase / Phosphatidylinositol 3- and 4-kinases catalytic domain profile. / Phosphatidylinositol 3-/4-kinase, catalytic domain / C2 domain superfamily / Armadillo-type fold / Ubiquitin-like domain superfamily / Immunoglobulins / Protein kinase-like domain superfamily / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit gamma isoform
Similarity search - Component
Biological speciesHomo sapiens (human)
Lama glama (llama)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.96 Å
AuthorsBurke, J.E. / Nam, S.E. / Rathinaswamy, M.K. / Yip, C.K.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)168998 Canada
CitationJournal: Elife / Year: 2023
Title: Allosteric activation or inhibition of PI3Kγ mediated through conformational changes in the p110γ helical domain.
Authors: Noah J Harris / Meredith L Jenkins / Sung-Eun Nam / Manoj K Rathinaswamy / Matthew A H Parson / Harish Ranga-Prasad / Udit Dalwadi / Brandon E Moeller / Eleanor Sheeky / Scott D Hansen / ...Authors: Noah J Harris / Meredith L Jenkins / Sung-Eun Nam / Manoj K Rathinaswamy / Matthew A H Parson / Harish Ranga-Prasad / Udit Dalwadi / Brandon E Moeller / Eleanor Sheeky / Scott D Hansen / Calvin K Yip / John E Burke /
Abstract: PI3Kγ is a critical immune signaling enzyme activated downstream of diverse cell surface molecules, including Ras, PKCβ activated by the IgE receptor, and Gβγ subunits released from activated ...PI3Kγ is a critical immune signaling enzyme activated downstream of diverse cell surface molecules, including Ras, PKCβ activated by the IgE receptor, and Gβγ subunits released from activated GPCRs. PI3Kγ can form two distinct complexes, with the p110γ catalytic subunit binding to either a p101 or p84 regulatory subunit, with these complexes being differentially activated by upstream stimuli. Here, using a combination of cryo electron microscopy, HDX-MS, and biochemical assays, we have identified novel roles of the helical domain of p110γ in regulating lipid kinase activity of distinct PI3Kγ complexes. We defined the molecular basis for how an allosteric inhibitory nanobody potently inhibits kinase activity through rigidifying the helical domain and regulatory motif of the kinase domain. The nanobody did not block either p110γ membrane recruitment or Ras/Gβγ binding, but instead decreased ATP turnover. We also identified that p110γ can be activated by dual PKCβ helical domain phosphorylation leading to partial unfolding of an N-terminal region of the helical domain. PKCβ phosphorylation is selective for p110γ-p84 compared to p110γ-p101, driven by differential dynamics of the helical domain of these different complexes. Nanobody binding prevented PKCβ-mediated phosphorylation. Overall, this work shows an unexpected allosteric regulatory role of the helical domain of p110γ that is distinct between p110γ-p84 and p110γ-p101 and reveals how this can be modulated by either phosphorylation or allosteric inhibitory binding partners. This opens possibilities of future allosteric inhibitor development for therapeutic intervention.
History
DepositionJul 14, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 19, 2023Provider: repository / Type: Initial release
Revision 1.0Jul 19, 2023Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 19, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 19, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Jul 19, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 19, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jun 12, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / em_3d_fitting_list
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type
Revision 1.2Jun 4, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit gamma isoform
B: Nanobody NB7


Theoretical massNumber of molelcules
Total (without water)141,2022
Polymers141,2022
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit gamma isoform / PI3-kinase subunit gamma / PI3K-gamma / PI3Kgamma / PtdIns-3-kinase subunit gamma / ...PI3-kinase subunit gamma / PI3K-gamma / PI3Kgamma / PtdIns-3-kinase subunit gamma / Phosphatidylinositol 4 / 5-bisphosphate 3-kinase 110 kDa catalytic subunit gamma / PtdIns-3-kinase subunit p110-gamma / p110gamma / Phosphoinositide-3-kinase catalytic gamma polypeptide / Serine/threonine protein kinase PIK3CG / p120-PI3K


Mass: 126627.406 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PIK3CG / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P48736, phosphatidylinositol 3-kinase, phosphatidylinositol-4,5-bisphosphate 3-kinase, phosphatidylinositol-4-phosphate 3-kinase, non-specific serine/threonine protein kinase
#2: Antibody Nanobody NB7


Mass: 14574.995 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Lama glama (llama) / Production host: Escherichia coli (E. coli)
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Complex of p110 gamma with NB7 / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Molecular weightValue: 0.126454 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 8.5
Details: Freshly prepared gel filtration buffer, filtered through 0.22 um filter and degassed
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMtris(hydroxymethyl)aminomethane1
2100 mMSodium ChlorideNaCl1
350 mMAmmonium Sulfate(NH4)2SO41
40.5 mMtris(2-carboxyethyl)phosphine1
SpecimenConc.: 0.45 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Specimen was p110 gamma purified with stabilizing nanobody, NB7, to homogeneity by gel filtration.
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: C-flat-2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K
Details: 3 uL of specimen was loaded onto grid and immediately blotted for 1.5 seconds with -5 force before plunging into liquid ethane.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 7344

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Processing

SoftwareName: PHENIX / Version: 1.19.1_4122: / Classification: refinement
EM software
IDNameVersionCategory
1cryoSPARC3.3.1particle selection
4cryoSPARC3.3.1CTF correction
9cryoSPARC3.3.1initial Euler assignment
10cryoSPARC3.3.1final Euler assignment
11cryoSPARC3.3.1classification
12cryoSPARC3.3.13D reconstruction
19PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.96 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 149603 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingPDB-ID: 7MEZ

7mez


Pdb chain-ID: A / Accession code: 7MEZ / Pdb chain residue range: 1-1102 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0029105
ELECTRON MICROSCOPYf_angle_d0.45112341
ELECTRON MICROSCOPYf_dihedral_angle_d3.6111185
ELECTRON MICROSCOPYf_chiral_restr0.041366
ELECTRON MICROSCOPYf_plane_restr0.0041577

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