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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


secretory granule localization / negative regulation of triglyceride catabolic process / natural killer cell chemotaxis / neutrophil extravasation / phosphatidylinositol-4-phosphate 3-kinase / regulation of calcium ion transmembrane transport / positive regulation of acute inflammatory response / respiratory burst involved in defense response / negative regulation of cardiac muscle contraction / T cell chemotaxis ...secretory granule localization / negative regulation of triglyceride catabolic process / natural killer cell chemotaxis / neutrophil extravasation / phosphatidylinositol-4-phosphate 3-kinase / regulation of calcium ion transmembrane transport / positive regulation of acute inflammatory response / respiratory burst involved in defense response / negative regulation of cardiac muscle contraction / T cell chemotaxis / negative regulation of fibroblast apoptotic process / phosphatidylinositol 3-kinase complex, class IB / sphingosine-1-phosphate receptor signaling pathway / dendritic cell chemotaxis / 1-phosphatidylinositol-4-phosphate 3-kinase activity / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / phosphatidylinositol-4,5-bisphosphate 3-kinase / phosphatidylinositol 3-kinase / phosphatidylinositol 3-kinase complex, class IA / phosphatidylinositol-3-phosphate biosynthetic process / 1-phosphatidylinositol-3-kinase activity / mast cell degranulation / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / hepatocyte apoptotic process / positive regulation of Rac protein signal transduction / regulation of cell adhesion mediated by integrin / Synthesis of PIPs at the plasma membrane / phosphatidylinositol phosphate biosynthetic process / regulation of angiogenesis / T cell proliferation / cellular response to cAMP / GPVI-mediated activation cascade / T cell activation / ephrin receptor binding / neutrophil chemotaxis / positive regulation of endothelial cell migration / phosphatidylinositol 3-kinase/protein kinase B signal transduction / positive regulation of cytokine production / positive regulation of MAP kinase activity / platelet aggregation / endocytosis / G beta:gamma signalling through PI3Kgamma / Signaling by CSF1 (M-CSF) in myeloid cells / kinase activity / positive regulation of cytosolic calcium ion concentration / angiogenesis / adaptive immune response / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / non-specific serine/threonine protein kinase / protein kinase activity / immune response / inflammatory response / G protein-coupled receptor signaling pathway / phosphorylation / protein serine kinase activity / innate immune response / protein serine/threonine kinase activity / ATP binding / membrane / identical protein binding / 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. / Phosphoinositide 3-kinase C2 / Phosphoinositide 3-kinase, region postulated to contain C2 domain ...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. / Phosphoinositide 3-kinase C2 / Phosphoinositide 3-kinase, region postulated to contain C2 domain / C2 phosphatidylinositol 3-kinase-type domain / C2 phosphatidylinositol 3-kinase (PI3K)-type domain profile. / Phosphoinositide 3-kinase, accessory (PIK) domain superfamily / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / 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 / Protein kinase-like domain superfamily
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

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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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
Water0
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)

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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 ChlorideNaClSodium chloride1
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 FIELDBright-field microscopy / 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
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 / Pdb chain residue range: 1-1102
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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