NMR paper Breaking the limits in analyzing carbohydrate recognition by NMR: Resolving Branch-Selective Interaction of a Tetraantennary N-Glycan with lectins

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[NMR paper] Breaking the limits in analyzing carbohydrate recognition by NMR: Resolving Branch-Selective Interaction of a Tetraantennary N-Glycan with lectins

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NMR processing:

MDD

NMR assignment:

Backbone:

Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

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GeNMR

I-TASSER

Refinement:

Amber

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Fragment-based:

Homology-based:

Torsion angles from chemical shifts:

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TALOS

Promega- Proline

Secondary structure from chemical shifts:

CSI (via RCI server)

TALOS

MICS caps, β-turns

d2D

PECAN

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RCI

Interactions from chemical shifts:

HADDOCK

Chemical shifts re-referencing:

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NOEs, other restraints:

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SAVES2 or SAVES4

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FANDAS

MestReS

V-NMR

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Backbone S2

Methyl S2

B-factor

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Sparta+

Camshift

CH3shift- Methyl

ArShift- Aromatic

ShiftS

Proshift

PPM

CheShift-2- Cα

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Shifty

Camcoil

Poulsen_rc_CS

Disordered proteins:

MAXOCC

Format conversion & validation:

CCPN

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Protein disorder:

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Protein solubility:

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Solid-state NMR:

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Breaking the limits in analyzing carbohydrate recognition by NMR: Resolving Branch-Selective Interaction of a Tetraantennary N-Glycan with lectins

Breaking the limits in analyzing carbohydrate recognition by NMR: Resolving Branch-Selective Interaction of a Tetraantennary N-Glycan with lectins

Abstract: The biological recognition of complex-type N-glycans is part of many key physiological and pathological events. Despite their importance, the structural characterization of these events remains an unsolved task. The inherent flexibility of N-glycans hampers crystallization and the chemical equivalence of individual branches precludes their NMR characterization. By using a chemoenzymatically synthesized tetraantennary N-glycan conjugated to a lanthanide binding tag, the NMR signals under paramagnetic conditions discriminated all four N-acetyl lactosamine antennae with unprecedented resolution. The NMR data revealed the conformation of the N-glycan and permitted for the first time the direct identification of individual branches involved in the recognition by two N-acetyllactosamine-binding lectins, Datura stramonium seed lectin (DSL) and Ricinus Communis agglutinin (RCA120).

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