2A73 Immune System date Jul 04, 2005
title Human Complement Component C3
authors B.J.C.Janssen, E.G.Huizinga, H.C.A.Raaijmakers, A.Roos, M.R.Daha K.Nilsson-Ekdahl, B.Nilsson, P.Gros
compound source
Molecule: Complement C3
Chain: A
Fragment: Residue 1-645
Other_details: Mature C3 Is Made Up Of Two Fragments A & B Linked By S-S Bond;
Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Other_details: Serum

Molecule: Complement C3
Chain: B
Fragment: Residue 650-1663

Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Other_details: Serum
symmetry Space Group: I 2 2 2
R_factor 0.230 R_Free 0.289
length a length b length c angle alpha angle beta angle gamma
116.980 156.260 271.200 90.00 90.00 90.00
method X-Ray Diffractionresolution 3.30 Å
ligand BMA, MAN, NAG enzyme


Primary referenceStructures of complement component C3 provide insights into the function and evolution of immunity., Janssen BJ, Huizinga EG, Raaijmakers HC, Roos A, Daha MR, Nilsson-Ekdahl K, Nilsson B, Gros P, Nature. 2005 Sep 22;437(7058):505-11. PMID:16177781
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (258 Kb) [Save to disk]
  • Biological Unit Coordinates (2a73.pdb1.gz) 251 Kb
  • LPC: Ligand-Protein Contacts for 2A73
  • CSU: Contacts of Structural Units for 2A73
  • Likely Quarternary Molecular Structure file(s) for 2A73
  • Structure Factors (315 Kb)
  • Retrieve 2A73 in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 2A73 from S2C, [Save to disk]
  • Re-refined 2a73 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 2A73 in 3D
  • Proteopedia, because life has more than 2D.
  • On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure.
  • On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz.
  • Visual 3D analysis of 2A73
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Electron Density related parameters from EDS Electron Density Server, at Upsala
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 2A73, from MSDmotif at EBI
  • Fold representative 2a73 from FSSP and Dali (Families of Structurally Similar Proteins)
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [2a73_B] [2a73_A] [2a73]
  • SWISS-PROT database: [P01024]
  • Domain organization of [CO3_HUMAN] by SWISSPFAM
  • Domains found in 2A73: [A2M] [A2M_N_2] [A2M_recep] [ANATO] [C345C] [Thiol-ester_cl ] by SMART
  • Other resources with information on 2A73
  • Community annotation for 2A73 at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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