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Solution Structure of a Circular-Permuted Variant of the Potent HIV-inactivating Protein Cyanovirin-N
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
1H-15N HSQC
6.0
300
2
1H-13C HMQC
6.0
300
3
HNHA
6.0
300
4
HCCH-TOCSY
6.0
300
5
(H)C(CCO)NH-TOCSY
6.0
300
6
NOESY
6.0
300
7
4D 13C/13C separated NOE HNHB
6.0
300
8
2D HN(CO)CG
6.0
300
9
HNCG
6.0
300
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DMX500
500
2
Bruker
DRX600
600
3
Bruker
DMX750
750
4
Bruker
DMX800
800
NMR Refinement
Method
Details
Software
for dyana, Standard target function-simulated annealing protocol. For CNS, Simulated-annealing in Cartesian space
DYANA
NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number
Conformers Submitted Total Number
26
Representative Model
1 (minimized average structure)
Additional NMR Experimental Information
Details
The minimized average structure is model 1. Models 2-26 are the the final 25 conformer ensemble. DYANA and CNS were used for refinement. VIRTUALLY COMPLETE RESONANCE ASSIGNMENTS WERE REPORTED I (2001) J.Biom.NMR, 19: 289-90; http://www.bmrb.wisc.edu. Stereo-specific assignments for all the methyl groups of of the eight Leu residues and for the alpha-methylene pr eight Gly, 46 beta-methylene protons and the gamma-methy of the seven Ile were available. In total, 1879 experim were employed, representing ~19 constraints per residue. structures was first calculated with DYANA, based on 114 92 hydrogen bond distances and 193 dihedral angles. Ref values yielded an esemble of 50 structures exhibiting at 0.26+/-0.06 A and 0.64+/-0.08A with respect to the mean backbone (N,CA,C') and all heavy atoms, respectively, an 0.81+/-0.10A^2. This initial ensemble of structures was residual dipolar couplings (80) and chemical shifts (291 programs CNS. Overall, excellent agreement with the exp good covalent geometry was maintained throughout. The f was selected and are presented here as MODELS2-26, and a mean structure of this ensemble is presented here as MOD.