2QKI	Immune System Hydrolase Inhibitor	date	Jul 11, 2007
title	Human C3c In Complex With The Inhibitor Compstatin
authors	B.J.C.Janssen, E.F.Halff, J.D.Lambris, P.Gros
compound		source
Molecule: Complement C3 Chain: A, D Fragment: Residues 23-665		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606
Molecule: Complement C3 Chain: B, E Fragment: Residues 749-936		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606
Molecule: Complement C3 Chain: C, F Fragment: Residues 1321-1663		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606
Molecule: Compstatin Chain: G, H Engineered: Yes		Synthetic: Yes Other_details: Synthetic Peptide
symmetry	Space Group: P 1 21 1	R_factor 0.213 R_Free 0.281
crystal cell	length a length b length c angle alpha angle beta angle gamma 85.809 124.754 127.367 90.00 95.08 90.00
method	X-Ray Diffraction	resolution	2.40 Å
ligand	ACE, BR, GOL, K, NAG, NH2	enzyme
note	2QKI is a representative structure
Gene Ontology	Chain Function Process Component A, D E, B F, C
Primary reference	Structure of compstatin in complex with complement component C3c reveals a new mechanism of complement inhibition., Janssen BJ, Halff EF, Lambris JD, Gros P, J Biol Chem. 2007 Oct 5;282(40):29241-7. Epub 2007 Aug 6. PMID:17684013

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (370 Kb) [Save to disk] Biological Unit Coordinates (2qki.pdb1.gz) 182 Kb Biological Unit Coordinates (2qki.pdb2.gz) 186 Kb LPC: Ligand-Protein Contacts for 2QKI CSU: Contacts of Structural Units for 2QKI Likely Quarternary Molecular Structure file(s) for 2QKI Structure Factors (5224 Kb) Retrieve 2QKI in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 2QKI from S2C, [Save to disk] Re-refined 2qki structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 2QKI 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 2QKI

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 2QKI, from MSDmotif at EBI

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [2qki_H] [2qki_A] [2qki_E] [2qki_B] [2qki_D] [2qki] [2qki_G] [2qki_F] [2qki_C] SWISS-PROT database: [P01024] Domain organization of [CO3_HUMAN] by SWISSPFAM Domains found in 2QKI: [A2M] [A2M_N_2] [A2M_recep] [C345C ] by SMART

Other resources with information on 2QKI

Community annotation for 2QKI at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

Movements, Movies and Images

Images from IMB Jena Image Library of Biological Macromolecules.

You may enter another PDB ID code

Go [Back], to the [PDB Lite page], to the [OCA Search page] or to the [PDB Home page]

---

OCA© by Jaime Prilusky, 1996-2014,2022 Bioinformatics Unit Weizmann Institute of Science

---