NMR paper NMR solution structure of a cytoplasmic surface loop of the human red cell anion tran

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[NMR paper] NMR solution structure of a cytoplasmic surface loop of the human red cell anion tran

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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:

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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

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HADDOCK

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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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Amber

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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

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CCPN

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Protein disorder:

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11-17-2010, 11:15 PM

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NMR solution structure of a cytoplasmic surface loop of the human red cell anion tran

NMR solution structure of a cytoplasmic surface loop of the human red cell anion transporter, band 3.

Related Articles NMR solution structure of a cytoplasmic surface loop of the human red cell anion transporter, band 3.

Biochemistry. 1998 Aug 18;37(33):11670-8

Authors: Askin D, Bloomberg GB, Chambers EJ, Tanner MJ

The membrane domain of the human red cell anion transport protein, band 3, is too large to be studied by solution nuclear magnetic resonance spectroscopy (NMR), and its amphiphilic nature requires the use of detergents for solubilization. An alternative approach is to divide the protein into smaller (trans-membrane or surface loop) domains for NMR study. We report the structure of a 46-residue synthetic peptide that corresponds to the cytoplasmic surface loop connecting the putative 12th and 13th trans-membrane spans (residues 796-841) in the 14 span model of band 3. This peptide was shown by circular dichroism (CD) to be 38% helical in 30% trifluoroacetic acid. Two regions of helix (one close to the N-terminus of the peptide and one close to the C-terminus of the peptide) were identified by NMR. Long-range nuclear Overhauser effect (NOE) cross-peaks showed the two helices to be in near proximity. The helices were separated by a proline-rich loop that exhibited local order but was mobile with respect to the rest of the peptide. We discuss how the NMR structure of this loop fits the current models of band 3 structure and topology and the results of recent mutagenesis experiments. A cyclic version of this peptide was synthesized and studied by CD, but NMR studies were not possible due to the low solubility of this peptide.

PMID: 9709005 [PubMed - indexed for MEDLINE]

Source: PubMed

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