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
crystal cell	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 Diffraction	resolution	3.30 Å
ligand	BMA, MAN, NAG	enzyme
Gene Ontology	Chain Function Process Component A B
Primary reference	Structures 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

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Visual 3D analysis of 2A73

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Structure-derived information

Electron Density related parameters from EDS Electron Density Server, at Upsala Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 2A73, from MSDmotif at EBI

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)

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