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Structure of complement receptor (CR) 2 and CR2-C3d complexes.

J Hannan¹, K Young, G Szakonyi

¹Department of Medicine, University of Colorado Health Sciences Center, Denver 80262, USA.

Biochemical Society Transactions

|November 21, 2002

Summary

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Researchers elucidated the structure of complement receptor 2 (CR2) interacting with C3d, revealing key binding sites and a V-shaped SCR1-SCR2 domain. This structural insight into CR2-C3d interactions advances understanding of immune responses.

Area of Science:

Structural Biology
Immunology
Biochemistry

Background:

Complement receptor 2 (CR2) plays a crucial role in the innate and adaptive immune systems by binding complement fragments like C3d.
Understanding the molecular interactions between CR2 and C3d is essential for deciphering complement-mediated immune regulation and developing targeted therapies.

Purpose of the Study:

To determine the high-resolution crystal structure of the N-terminal short consensus repeats (SCRs) of human CR2 in complex with C3d.
To identify the specific interaction sites and structural features governing CR2-C3d binding.
To investigate the functional implications of identified structural elements and polymorphisms on CR2-C3d interactions.

Main Methods:

X-ray crystallography was employed to obtain the co-crystal structure of CR2 SCR1-SCR2 with C3d.

Related Experiment Videos

Site-directed mutagenesis of C3d was performed to assess the impact of specific amino acid residues on CR2 binding.

Analysis of a naturally occurring polymorphism in a mouse model was conducted to evaluate its effects on binding and structure.

Main Results:

The crystal structure revealed a primary C3d interaction site within SCR2 of CR2 and a hydrophobic interaction stabilizing SCR1 and SCR2 in a V-shape.
CR2 molecules formed dimers through interactions involving SCR1, and C3d engaged CR2 via non-linear sequences.
Mutations at the co-crystal interface decreased C3d binding, and a mouse polymorphism affected C3d binding and disrupted the dimer interface.
Solution studies indicated an extended SCR1-SCR2 structure and differential ligand-receptor kinetics with longer CR2 forms, suggesting a more complex interaction.

Conclusions:

The determined structure provides atomic-level detail of the CR2-C3d interaction, highlighting key binding interfaces and structural motifs.
Findings suggest that CR2-C3d interactions are more complex than previously thought, involving dimer formation and potentially dynamic structural rearrangements.
Further studies are needed to fully characterize solution-phase interactions and the three-dimensional structure of CR2 alone and its mutants to elucidate the complete interaction mechanism.