Interaction between separated consecutive complement control modules of human C1r: implications for dimerization of the full-length protease.
Complement control protein modules (CCP) typically mediate protein:protein interaction during immune response in vertebrates. Using NMR chemical shift perturbation mapping, we present previously lacking experimental evidence for intermolecular interactions between the CCP1 and CCP2 modules of the human C1r serine protease (SP). The identified interface is clearly distinct from that observed in the covalently linked CCP1-CCP2 pair. Structural models of the CCP1-CCP2-SP segments of two C1r molecules built on the basis of shift perturbation data are fully consistent with an extended interaction interface and suggests the possibility of a structural rearrangement as a switch between functional states of human C1r.
Láng
András
A
Laboratory of Structural Chemistry and Biology, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary.
Major
Balázs
B
Szilágyi
Katalin
K
Gáspári
Zoltán
Z
Gál
Péter
P
Závodszky
Péter
P
Perczel
András
A
D001665:Binding Sites; D015923:Complement C1r / Q000737:chemistry* / Q000378:metabolism*; D006801:Humans; D008958:Models, Molecular; D019906:Nuclear Magnetic Resonance, Biomolecular; D010447:Peptide Hydrolases / Q000737:chemistry* / Q000378:metabolism*; D011485:Protein Binding; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D013379:Substrate Specificity
D010447:Peptide Hydrolases; D015923:Complement C1r