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Electrostatic contributions drive the interaction between Staphylococcus aureus protein Efb-C and its complement

Nurit Haspel¹, Daniel Ricklin, Brian V Geisbrecht

¹Department of Computer Science, Rice University, Houston, Texas 77005, USA.

Protein Science : a Publication of the Protein Society

|August 9, 2008

Summary

The Staphylococcus aureus extracellular fibrinogen-binding protein (Efb-C) inhibits complement activation by binding to human C3d. Key mutations disrupt binding thermodynamics and kinetics, revealing crucial interactions for this potent inhibition.

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Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes

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Published on: January 3, 2020

Area of Science:

Immunology
Structural Biology
Biochemistry

Background:

Staphylococcus aureus extracellular fibrinogen-binding protein (Efb-C) possesses a C3-inhibitory domain.
Efb-C features a novel three-helix bundle motif regulating complement activation.
Previous studies identified Arg-131 and Asn-138 of Efb-C as critical for C3d interaction.

Purpose of the Study:

To comprehensively analyze the physical and chemical forces governing the Efb-C/C3d interaction.
To investigate the impact of specific mutations (R131A, N138A) on Efb-C/C3d binding.
To characterize the network of interactions at the Efb-C/C3d binding interface.

Main Methods:

Structural analysis of Efb-C/C3d complexes.
Biophysical characterization of binding thermodynamics and kinetics.
Computational methods to probe interaction mechanisms.

Main Results:

Mutations R131A and N138A did not significantly alter the overall structure of the Efb-C/C3d complex.
These mutations markedly impaired the thermodynamic and kinetic profiles of the complexes.
An intricate network of salt bridges and hydrogen bonds was identified, anchoring Efb-C to C3d.

Conclusions:

The Efb-C/C3d interaction is stabilized by a complex network of non-covalent bonds.
Specific residues, including Arg-131 and Asn-138, are vital for the functional activity of Efb-C.
Understanding these interactions provides insights into Staphylococcus aureus evasion of the complement system.