NMR paper NMR Identification of the Binding Surfaces Involved in the Salmonella and Shigella Type III Secretion Tip-Translocon Protein-Protein Interactions.

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[NMR paper] NMR Identification of the Binding Surfaces Involved in the Salmonella and Shigella Type III Secretion Tip-Translocon Protein-Protein Interactions.

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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:

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:

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NOEs, other restraints:

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RDCs:

Pseudocontact shifts:

Protein geomtery:

SAVES2 or SAVES4

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FANDAS

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V-NMR

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Methyl S2

B-factor

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Shiftx2

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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04-20-2016, 05:09 PM

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NMR Identification of the Binding Surfaces Involved in the Salmonella and Shigella Type III Secretion Tip-Translocon Protein-Protein Interactions.

NMR Identification of the Binding Surfaces Involved in the Salmonella and Shigella Type III Secretion Tip-Translocon Protein-Protein Interactions.

Related Articles NMR Identification of the Binding Surfaces Involved in the Salmonella and Shigella Type III Secretion Tip-Translocon Protein-Protein Interactions.

Proteins. 2016 Apr 19;

Authors: McShan AC, Kaur K, Chatterjee S, Knight KM, De Guzman RN

Abstract
The type III secretion system (T3SS) is essential for the pathogenesis of many bacteria including Salmonella and Shigella, which together are responsible for millions of deaths worldwide each year. The structural component of the T3SS consists of the needle apparatus, which is assembled in part by the protein-protein interaction between the tip and the translocon. The atomic detail of the interaction between the tip and the translocon proteins is currently unknown. Here, we used NMR methods to identify that the N-terminal domain of the Salmonella SipB translocon protein interacts with the SipD tip protein at a surface at the distal region of the tip formed by the mixed ?/? domain and a portion of its coiled-coil domain. Likewise, the Shigella IpaB translocon protein and the IpaD tip protein interact with each other using similar surfaces identified for the Salmonella homologs. Furthermore, removal of the extreme N-terminal residues of the translocon protein, previously thought to be important for the interaction, had little change on the binding surface. Finally, mutations at the binding surface of SipD reduced invasion of Salmonella into human intestinal epithelial cells. Together, these results reveal the binding surfaces involved in the tip-translocon protein-protein interaction and advance our understanding of the assembly of the T3SS needle apparatus. This article is protected by copyright. All rights reserved.

PMID: 27093649 [PubMed - as supplied by publisher]

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