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- PDB-9u4e: Cryo-EM structure of the human CRP-CPS23F complex -

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Basic information

Entry
Database: PDB / ID: 9u4e
TitleCryo-EM structure of the human CRP-CPS23F complex
ComponentsC-reactive protein
KeywordsIMMUNE SYSTEM / complex / pentamer / anti-bacterial immunity
Function / homology
Function and homology information


regulation of interleukin-8 production / opsonization / complement component C1q complex binding / low-density lipoprotein particle binding / vasoconstriction / choline binding / negative regulation of mononuclear cell proliferation / Classical antibody-mediated complement activation / low-density lipoprotein particle receptor binding / negative regulation of macrophage derived foam cell differentiation ...regulation of interleukin-8 production / opsonization / complement component C1q complex binding / low-density lipoprotein particle binding / vasoconstriction / choline binding / negative regulation of mononuclear cell proliferation / Classical antibody-mediated complement activation / low-density lipoprotein particle receptor binding / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / positive regulation of superoxide anion generation / acute-phase response / defense response to Gram-positive bacterium / inflammatory response / innate immune response / calcium ion binding / positive regulation of gene expression / extracellular space / extracellular region / identical protein binding
Similarity search - Function
: / Pentaxin, conserved site / Pentraxin domain signature. / Pentaxin family / Pentraxin / C-reactive protein / pentaxin family / Pentraxin-related / Pentraxin (PTX) domain profile. / Concanavalin A-like lectin/glucanase domain superfamily
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.78 Å
AuthorsChen, D.Y. / Xie, Y.F. / Gao, F. / Qi, J.X. / Zhang, J.R.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: To Be Published
Title: Cryo-EM structure of the human CRP-CPS23F complex
Authors: Chen, D.Y. / Xie, Y.F. / Gao, F. / Qi, J.X. / Zhang, J.R.
History
DepositionMar 19, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Sep 24, 2025Provider: repository / Type: Initial release
Revision 1.0Sep 24, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Sep 24, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Sep 24, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Sep 24, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Sep 24, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: C-reactive protein
B: C-reactive protein
C: C-reactive protein
D: C-reactive protein
E: C-reactive protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)129,65120
Polymers125,3075
Non-polymers4,34415
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
C-reactive protein


Mass: 25061.477 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CRP, PTX1 / Production host: Homo sapiens (human) / References: UniProt: P02741
#2: Polysaccharide
alpha-L-rhamnopyranose-(1-2)-1,3-bis(oxidanyl)propan-2-yl [(2~{R},3~{S},4~{S},5~{R})-2- ...alpha-L-rhamnopyranose-(1-2)-1,3-bis(oxidanyl)propan-2-yl [(2~{R},3~{S},4~{S},5~{R})-2-(hydroxymethyl)-3,5,6-tris(oxidanyl)oxan-4-yl] hydrogen phosphate-(1-4)-beta-L-rhamnopyranose-(1-4)-beta-D-glucopyranose


Type: oligosaccharide / Mass: 788.636 Da / Num. of mol.: 5 / Source method: obtained synthetically
DescriptorTypeProgram
[][b-D-Glcp]{[(4+1)][b-L-Rhap]{[(4+1)][b-D-Galp]{[(2+1)][a-L-Rhap]{}[(3+0)][P]{[(0+1)][<C3O2>]{}}}}}LINUCSPDB-CARE
#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 10 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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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 C-reactive protein and CPS23F / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.78 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 207101 / Symmetry type: POINT
RefinementHighest resolution: 2.78 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)

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