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Dominant form of the low-affinity complex of yeast cytochrome c and cytochrome c peroxidase
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D 1H-15N HSQC
0.4 mM [U-2H; U-15N] CcP, 0.4 mM Cc, 0.4 mM Cc1, 20 mM sodium phosphate
93% H2O/7% D2O
15
6.0
ambient
298
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
Uniform NMR System
800
NMR Refinement
Method
Details
Software
simulated annealing
AUTHORS STATE THAT CCP (CHAIN A) HAS TWO BINDING SITES FOR CC (CHAINS B AND C). ONE OF THE SITES IS BLOCKED BY PREPARING A COVALENT CCP-CC CROSSLINK (CHAINS A-B), WHILE STUDYING THE BINDING OF THE SECOND CC MOLECULE (CHAIN C) TO ANOTHER SITE. THE CROSS-LINKING WAS DONE VIA AN ENGINEERED DISULFIDE BETWEEN CCP V197C AND CC A81C GROUPS (I.E. CHAIN A V197C - CHAIN B A81C). IN ADDITION, THE NATIVE CYS RESIDUES OF BOTH CCP AND CC WERE MUTATED OUT (I.E. CHAIN A C128A AND CHAIN B C102T MUTATIONS). THE CROSSLINK STRUCTURE (CHAINS A-B), TAKEN FROM THE PDB ENTRY 1S6V, WAS KEPT FIXED IN THE NMR RESTRAINT-DRIVEN RIGID-BODY DOCKING OF THE SECOND CC MOLECULE (CHAIN C). RIGID-BODY REFINEMENT PROTOCOL IS DESCRIBED IN DETAIL IN THE MAIN CITATION ASSOCIATED WITH THIS ENTRY.