9RF3 | pdb_00009rf3

Structure of complement C3 in an extended conformation

PDB DOI: https://doi.org/10.2210/pdb9RF3/pdb
EM Map EMD-53939: EMDB EMDataResource

Classification: IMMUNE SYSTEM
Organism(s): Homo sapiens
Mutation(s): No

Deposited: 2025-06-04 Released: 2026-09-09
Deposition Author(s): Whittaker, J.J., Eikrem, D., Whittaker, J., Seisenbaeva, G., Nilsson-Ekdahl, K., Nilsson, B., Sandgren, M., Kessler, V.G.
Funding Organization(s): Swedish Research Council

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 4.00 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 9RF3

This is version 1.0 of the entry. See complete history.

Literature

Titanium Nanoparticles Strongly Bind to Complement C3 of the Alternative Pathway

Whittaker, J.J., Eikrem, D., Whittaker, J., Seisenbaeva, G., Nilsson-Ekdahl, K., Nilsson, B., Sandgren, M., Kessler, V.G.

To be published.

Macromolecule Content

Total Structure Weight: 187.37 kDa
Atom Count: 11,078
Modeled Residue Count: 1,392
Deposited Residue Count: 1,663
Unique protein chains: 1

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Complement C3	A	1,663	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P01024 (Homo sapiens) Explore P01024 Go to UniProtKB: P01024
PHAROS: P01024 GTEx: ENSG00000125730
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P01024
Sequence Annotations Expand
Reference Sequence

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 4.00 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21.2_5419
RECONSTRUCTION	cryoSPARC	4.7

Structure Validation

View Full Validation Report

View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-09-09

Deposition Author(s):

Whittaker, J.J.

Seisenbaeva, G.

Nilsson-Ekdahl, K.

Funding Organization	Location	Grant Number
Swedish Research Council	Sweden	2022-03971_VR

Revision History (Full details and data files)

Version 1.0: 2026-09-09
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.