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NMR processing:
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Side-chains:
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Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
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Fragment-based:
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Template-based:
GeNMR
I-TASSER
Refinement:
Amber
Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
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Torsion angles from chemical shifts:
Preditor
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Secondary structure from chemical shifts:
CSI (via RCI server)
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MICS caps, β-turns
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Flexibility from chemical shifts:
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Interactions from chemical shifts:
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Chemical shifts re-referencing:
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UNIO Shiftinspector
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RDCs:
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Protein geomtery:
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NMR spectrum prediction:
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Flexibility from structure:
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Methyl S2
B-factor
Molecular dynamics:
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Chemical shifts prediction:
From structure:
Shiftx2
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CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
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From sequence:
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Camcoil
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Disordered proteins:
MAXOCC
Format conversion & validation:
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From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
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Isotope labeling:
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Solid-state NMR:
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Default Structure determination of uniformly 13 C, 15 N labeled protein using qualitative distance restraints from MAS solid-state 13 C-NMR observed paramagnetic relaxation enhancement

Structure determination of uniformly 13 C, 15 N labeled protein using qualitative distance restraints from MAS solid-state 13 C-NMR observed paramagnetic relaxation enhancement

Abstract

Magic angle spinning (MAS) solid-state nuclear magnetic resonance (NMR) is a powerful method for structure determination of insoluble biomolecules. However, structure determination by MAS solid-state NMR remains challenging because it is difficult to obtain a sufficient amount of distance restraints owing to spectral complexity. Collection of distance restraints from paramagnetic relaxation enhancement (PRE) is a promising approach to alleviate this barrier. However, the precision of distance restraints provided by PRE is limited in solid-state NMR because of incomplete averaged interactions and intermolecular PREs. In this report, the backbone structure of the B1 domain of streptococcal protein G (GB1) has been successfully determined by combining the CS-Rosetta protocol and qualitative PRE restraints. The derived structure has a Cα RMSD of 1.49Â*Ã? relative to the X-ray structure. It is noteworthy that our protocol can determine the correct structure from only three cysteine-EDTA-Mn2+ mutants because this number of PRE sites is insufficient when using a conventional structure calculation method based on restrained molecular dynamics and simulated annealing. This study shows that qualitative PRE restraints can be employed effectively for protein structure determination from a limited conformational sampling space using a protein fragment library.



Source: Journal of Biomolecular NMR
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