2N18

Dominant form of the low-affinity complex of yeast cytochrome c and cytochrome c peroxidase

SOLUTION NMR

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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.	VNMRJ

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	15
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMRJ		Varian
2	processing	NMRPipe		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
3	peak picking	CcpNMR		CCPN
4	chemical shift assignment	CcpNMR		CCPN
5	data analysis	CcpNMR		CCPN
6	structure solution	X-PLOR_NIH		Schwieters, Kuszewski, Tjandra and Clore
7	refinement	X-PLOR_NIH		Schwieters, Kuszewski, Tjandra and Clore