NMR paper Characterizing the Diastereoisomeric Distribution of Phosphorothioate Oligonucleotides by Metal Ion Complexation Chromatography, In-Series Reversed Phase-Strong Anion Exchange Chromatography, and (31)P NMR

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[NMR paper] Characterizing the Diastereoisomeric Distribution of Phosphorothioate Oligonucleotides by Metal Ion Complexation Chromatography, In-Series Reversed Phase-Strong Anion Exchange Chromatography, and (31)P NMR

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NMR processing:

MDD

NMR assignment:

Backbone:

Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

Template-based:

GeNMR

I-TASSER

Refinement:

Amber

Structure from chemical shifts:

Fragment-based:

Homology-based:

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:

NMR model quality:

NOEs, other restraints:

Chemical shifts:

RDCs:

Pseudocontact shifts:

Protein geomtery:

SAVES2 or SAVES4

Quality Control Check

NMR spectrum prediction:

FANDAS

MestReS

V-NMR

Flexibility from structure:

Backbone S2

Methyl S2

B-factor

Molecular dynamics:

Gromacs

Amber

Antechamber

Chemical shifts prediction:

From structure:

Shiftx2

Sparta+

Camshift

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:

Isotope labeling:

Solid-state NMR:

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11-24-2021, 06:01 AM

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Characterizing the Diastereoisomeric Distribution of Phosphorothioate Oligonucleotides by Metal Ion Complexation Chromatography, In-Series Reversed Phase-Strong Anion Exchange Chromatography, and (31)P NMR

Replacement of a non-bridging oxygen atom of the phosphate diester linkage of an oligonucleotide by sulfur conveys pharmacokinetic benefits, such as increased nuclease resistance and enhanced protein binding. Substitution renders the internucleotide linkages chiral, and so phosphorothioate diester (PS) oligonucleotides comprise complex mixtures of diastereoisomers. Currently, chromatographic separation of individual diastereoisomers is limited to oligonucleotides that contain no more than about...

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