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2004:
Kishore Uday; Ghai Rohit; Greenhough Trevor J; Shrive Annette K; Bonifati Domenico M; Gadjeva Mihaela G; Waters Patrick; Kojouharova Mihaela S; Chakraborty Trinad; Agrawal Alok
Structural and functional anatomy of the globular domain of complement protein C1q.
Immunology letters 2004;
95(
2):.
C1q is the first subcomponent of the classical pathway of the complement system and a major connecting link between innate and acquired immunity. As a versatile charge pattern recognition molecule, C1q is capable of engaging a broad range of ligands via its heterotrimeric globular domain (gC1q) which is composed of the C-terminal regions of its A (ghA), B (ghB) and C (ghC) chains. Recent studies using recombinant forms of ghA, ghB and ghC have suggested that the gC1q domain has a modular organization and each chain can have differential ligand specificity. The crystal structure of the gC1q, molecular modeling and protein engineering studies have combined to illustrate how modular organization, charge distribution and the spatial orientation of the heterotrimeric assembly offer versatility of ligand recognition to C1q. Although the biochemical and structural studies have provided novel insights into the structure-function relationships within the gC1q domain, they have also raised many unexpected issues for debate.
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