Primary Citation PubMed: 17051150
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The structure of OMCI, a novel lipocalin inhibitor of the complement system.
(2007) J Mol Biol 369
PubMed: 17445829 | PubMedCentral: PMC2724154 | DOI: 10.1016/j.jmb.2007.03.064
This is supported by a number of observations based on the structures of the C5 homologues C3 and C3b: (i) the contact area of the C3 C345C domain with the rest of the molecule in the C3 structure is ... nly 960 Å 2 , with an estimated energy for the interaction of less than 5 kcal/mol; 45 (ii) the relative orientation of the C3 C345C domain with respect to the main body of the molecule shows a large degree of flexibility when comparing the structure of C3 with those of C3b (PDB ID 2I07) and C3b:CRIg complex (PDB ID 2ICF): in the C3b structure the C3 C345C domain is swung out by 22° and moves by about 20 Å away from the position it occupies in C3; in the C3b:CRIg complex, the rotation is about 35° and the shift about 37 Å away from the C3 position; (iii) the anchor region (residues 1475–1495) securing the C3 C345C domain to the main body of C3 undergoes large conformational changes upon going from C3 to C3b.
Publication Year: 2007
Zinc-induced self-association of complement C3b and Factor H: implications for inflammation and age-related macular degeneration.
(2013) J Biol Chem 288
PubMed: 23661701 | PubMedCentral: PMC3696691 | DOI: 10.1074/jbc.M113.476143
Name PDB code Number of C3 domains Number of residues in the PDB file Unique zinc binding residues predicted METSITE >0.7 Number of unique zinc binding residues per 100 residues C3 2A73 13 161... 38 2.4 C3b 2ICF 12 1545 45 2.9 C3b 2I07 12 1531 27 1.8 C3u 3MMQ 13 1531 28 1.8 C3c 2A74 10 1109 17 1.5 C3d 1C3D 1 294 3 1.0 C3d 1GHQ 1 307 4 1.3 The front and back surfaces of the five C3 proteins showed that the partial zinc binding site predictions were broadly distributed ( Fig. 8 ).
The predictions used crystal structures for C3 (PDB code 2A73 ) ( 4 ), C3b (PDB codes 2I07 and 2ICF ) ( 51 , 52 ), C3c (PDB code 2A74 ) ( 4 ), and C3d (PDB codes 1C3D and 1GHQ ( 53 , 54 ), and a solution structure for C3u (PDB code 3MMQ ) ( 43 ).
Publication Year: 2013
A revised mechanism for the activation of complement C3 to C3b: a molecular explanation of a disease-associated polymorphism.
(2015) J Biol Chem 290
PubMed: 25488663 | PubMedCentral: PMC4303685 | DOI: 10.1074/jbc.M114.605691
The four C3b crystal structures used here have Protein Data Bank codes of 2I07 , 2WIN , 2WII , and 2ICF .
Publication Year: 2015
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