1IBI

QUAIL CYSTEINE AND GLYCINE-RICH PROTEIN, NMR, 15 MINIMIZED MODEL STRUCTURES

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	15N-HSQC	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
2	3D HNCA	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
3	3D HNCACB	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
4	3D HNCO	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
5	3D CBCA(CO)NH	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
6	3D HCCH-TOCSY	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
7	3D_CCH-TOCSY-NNH	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
8	3D_13C-NOESY-HSQC_(CA-centered)	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
9	3D_13C-NOESY-HSQC_(methyl-centered)	1-2mM qCRP2(LIM2) U-15N,13C; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299
10	3D_15N-NOESY-HSQC	1-2mM qCRP2(LIM2) U-15N; 20 mM potassium phosphate, 50mM KCl, 0.5mM dithiothreitol, 90% H2O, 10% D2O	90% H2O/10% D2O	20mM potassium phosphate; 50mM KCl	7.2	ambient	299

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITYPLUS 500	500

NMR Refinement
Method	Details	Software
simulated annealing	This entry represents the C-terminal LIM domain of the quail cysteine rich protein CRP2(LIM2) consisting of 15 minimized final structures. Residues MET 82 - ALA 117 and ASN 175 - GLN 194 were not observed and there is no information regarding the conformation that these residues may adopt in solution. The only stretch of residues for which there is structural information is GLU 118 - LYS 174 so the simulations were restricted to the central part ALA 117 - ASN 175, containing the two zinc knuckles. In an initial stage zinc was covalently attached to a linearized template structure, then tetrahedral coordination was enforced by distance constraints. Finally the zinc ions were covalently attached to the coordinating residues using standard force field parameters. 653 inter- and intra-residue NOE restraints were defined as strong, medium, weak and very weak and applied during the final refinement as well as 28 torsion angle restraints and 15 hydrogen bond restraints. Omega dihedral angles were restrained to trans (E). Average rmsd from exp. distance restraints(angstroms) 0.01, average rmsd from idealized covalent geometry: bonds(angstroms): 0.01; angles(deg) 1.98;	VNMR

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

Additional NMR Experimental Information

Details

Projection data related to the backbone dihedrals phi, psi from CaHa(i)-DD/C'(i)-CSA and CAHA(i)-DD/C'(i-1)-CSA relaxation and 15N(i)-1HN(i)-DD/13CO(i)-CSA and 1H(i)-15N(i)-13C'(i) DD-CSA cross correlation experiments. Side-chain dihedral angles chi1 from 2D quantitative J-spectroscopy experiments giving access to 3J(CO,Cgamma) and 3J(N,Cgamma). Differential relaxation of multiple-quantum coherences Gamma(i,j)=R(DQ)-R(ZQ), i,j denote 15N,1HN or 13C',15N, respectively.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	v6.1 Rev.B	Varian Associates, Inc.
2	processing	NMRPipe	v1.8 Rev 2001.030.21.27	Delaglio, F.
3	data analysis	ANSIG	v3.3	Kraulis, P.
4	structure solution	CNS	1.0	Brunger, A.
5	refinement	X-PLOR	3.851	Brunger, A.