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Charge pair interactions stabilizing ferredoxin-ferredoxin reductase complexes. Identification by complementary

M E Brandt¹, L E Vickery

¹Department of Physiology and Biophysics, University of California, Irvine 92717.

The Journal of Biological Chemistry

|August 15, 1993

Summary

This summary is machine-generated.

Specific charged residues on ferredoxin reductase (Fd-reductase) are crucial for binding to ferredoxin. Mutating Arg-239 and Arg-243 significantly reduced binding affinity, indicating their direct role in complex stabilization.

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Area of Science:

Biochemistry
Molecular Biology
Enzymology

Background:

Ferredoxin reductase (Fd-reductase) is essential for electron transfer to mitochondrial P450 enzymes.
Previous studies implicated Lys-243 in bovine Fd-reductase binding to ferredoxin.
The specific interactions governing this protein-protein complex remain incompletely understood.

Purpose of the Study:

To investigate the role of charged residues in human Fd-reductase for ferredoxin binding using site-directed mutagenesis.
To elucidate the electrostatic interactions critical for the ferredoxin-Fd-reductase complex formation.

Main Methods:

Site-directed mutagenesis of human Fd-reductase.
Expression of mutant proteins in Escherichia coli.
Assay of ferredoxin-mediated electron transfer activity and determination of Michaelis constants (Km).

Main Results:

Mutations R239S and R243Q in Fd-reductase drastically increased Km, indicating significantly lower affinity for ferredoxin.
Mutations at Lys-242 and Arg-241 showed minimal impact on ferredoxin binding.
Analysis of ferredoxin mutants (D76N, D79N) binding to Fd-reductase mutants suggests direct electrostatic interactions between Arg-239/Arg-243 of Fd-reductase and Asp-76/Asp-79 of ferredoxin.

Conclusions:

Arg-239 and Arg-243 of human Fd-reductase are critical for high-affinity binding to ferredoxin.
Specific electrostatic interactions between these arginine residues and aspartate residues on ferredoxin stabilize the complex.
These findings highlight the importance of charge-charge interactions in mediating protein-protein recognition in biological systems.