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NMR processing:
MDD
NMR assignment:
Backbone:
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MARS
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PINE
Side-chains:
UNIO ATNOS-Ascan
NOEs:
UNIO ATNOS-Candid
UNIO Candid
ASDP
Structure from NMR restraints:
Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
BMRB CS-Rosetta
Rosetta-NMR (Robetta)
Template-based:
GeNMR
I-TASSER
Refinement:
Amber
Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
Simshift
Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
CSI (via RCI server)
TALOS
MICS caps, β-turns
d2D
PECAN
Flexibility from chemical shifts:
RCI
Interactions from chemical shifts:
HADDOCK
Chemical shifts re-referencing:
Shiftcor
UNIO Shiftinspector
LACS
CheckShift
RefDB
NMR model quality:
NOEs, other restraints:
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PSVS
RPF scores
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Chemical shifts:
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Vasco
iCing
RDCs:
DC
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Pseudocontact shifts:
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Protein geomtery:
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What-If
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PSVS
MolProbity
SAVES2 or SAVES4
Vadar
Prosa
ProQ
MetaMQAPII
PSQS
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STAN
Ramachandran Plot
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ERRAT
Verify_3D
Harmony
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NMR spectrum prediction:
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MestReS
V-NMR
Flexibility from structure:
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Methyl S2
B-factor
Molecular dynamics:
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Chemical shifts prediction:
From structure:
Shiftx2
Sparta+
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CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
Shifty
Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
UPLABEL
Solid-state NMR:
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Default Structure of the metal-free gamma-carboxyglutamic acid-rich membrane binding region o

Structure of the metal-free gamma-carboxyglutamic acid-rich membrane binding region of factor IX by two-dimensional NMR spectroscopy.

Related Articles Structure of the metal-free gamma-carboxyglutamic acid-rich membrane binding region of factor IX by two-dimensional NMR spectroscopy.

J Biol Chem. 1995 Apr 7;270(14):7980-7

Authors: Freedman SJ, Furie BC, Furie B, Baleja JD

The gamma-carboxyglutamic acid-rich domain of blood coagulation Factor IX is required for the binding of the protein to phospholipid membranes. To investigate the three-dimensional structure of this domain, a synthetic peptide corresponding to residues 1-47 of Factor IX was studied by 1H NMR spectroscopy. In the absence of metal ions, the proton chemical shift dispersion in the one-dimensional NMR spectrum indicated that the peptide contains regular structural elements. Upon the addition of Ca(II) or Mg(II), large chemical shift changes were observed in the amide proton and methyl proton regions of the spectrum, consistent with the conformational transitions that metal ions are known to induce in native Factor IX. The apopeptide was studied by two-dimensional NMR spectroscopy at 500 MHz to determine its solution structure. Protons were assigned using total correlation spectroscopy, nuclear Overhauser effect spectroscopy, and double quantum-filtered correlation spectroscopy experiments. Intensities of cross-peaks in the nuclear Overhauser effect spectrum were used to generate a set of interproton distance restraints. The structure of the apopeptide was then calculated using distance geometry methods. There are three structural elements in the apopeptide that are linked by a flexible polypeptide backbone. These elements include a short amino-terminal tetrapeptide loop (amino acids 6-9), the disulfide-containing hexapeptide loop (amino acids 18-23), and a carboxyl-terminal alpha helix (amino acids 37-46). Amide hydrogen exchange kinetics indicate that the majority of the peptide is solvent accessible, except in the carboxyl-terminal element. The structured regions in the apopeptide are insufficient to support phospholipid binding, indicating the importance of additional structural features in the Ca(II)-stabilized conformer.

PMID: 7713897 [PubMed - indexed for MEDLINE]



Source: PubMed
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