Mutation of residues in the C3dg region of human complement component C3 corresponding to a proposed binding site for complement receptor type 2 (CR2, CD21) does not abolish binding of iC3b or C3dg to CR2.

Abstract excerpt

Most evidence points toward there being a shared binding site in complement receptor type 2 (CR2, CD21) for the complement ligand C3dg and the EBV surface envelope glycoprotein gp350/220. Indeed, synthetic peptide studies have suggested that the CR2-binding sites in human C3dg and EBV gp350/220 share a similar sequence motif. The proposed CR2-binding sequence in C3dg is EDPGKQLYNVEA (residues 1199-1210 of mature...

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