NMR paper NMR study of a membrane protein in detergent-free aqueous solution.

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[NMR paper] NMR study of a membrane protein in detergent-free aqueous solution.

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NMR processing:

MDD

NMR assignment:

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Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

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I-TASSER

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Amber

Structure from chemical shifts:

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

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NOEs, other restraints:

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SAVES2 or SAVES4

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FANDAS

MestReS

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Backbone S2

Methyl S2

B-factor

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Proshift

PPM

CheShift-2- Cα

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Shifty

Camcoil

Poulsen_rc_CS

Disordered proteins:

MAXOCC

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Protein disorder:

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Protein solubility:

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11-25-2010, 08:21 PM

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NMR study of a membrane protein in detergent-free aqueous solution.

NMR study of a membrane protein in detergent-free aqueous solution.

Related Articles NMR study of a membrane protein in detergent-free aqueous solution.

Proc Natl Acad Sci U S A. 2005 Jun 21;102(25):8893-8

Authors: Zoonens M, Catoire LJ, Giusti F, Popot JL

One of the major obstacles to membrane protein (MP) structural studies is the destabilizing effect of detergents. Amphipols (APols) are short amphipathic polymers that can substitute for detergents to keep MPs water-soluble under mild conditions. In the present work, we have explored the feasibility of studying the structure of APol-complexed MPs by NMR. As a test MP, we chose the 171-residue transmembrane domain of outer MP A from Escherichia coli (tOmpA), whose x-ray and NMR structures in detergent are known. 2H,15N-labeled tOmpA was produced as inclusion bodies, refolded in detergent solution, trapped with APol A8-35, and the detergent removed by adsorption onto polystyrene beads. The resolution of transverse relaxation-optimized spectroscopy-heteronuclear single-quantum correlation spectra of tOmpA/A8-35 complexes was found to be close to that of the best spectra obtained in detergent solutions. The dispersion of chemical shifts indicated that the protein had regained its native fold and retained it during the exchange of surfactants. MP-APol interactions were mapped by substituting hydrogenated for deuterated A8-35. The resulting dipolar broadening of amide proton linewidths was found to be limited to the beta-barrel region of tOmpA, indicating that A8-35 binds specifically to the hydrophobic transmembrane surface of the protein. The potential of this approach to MP studies by solution NMR is discussed.

PMID: 15956183 [PubMed - indexed for MEDLINE]

Source: PubMed

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