2nr1

From Proteopedia

Revision as of 15:49, 20 March 2008

TRANSMEMBRANE SEGMENT 2 OF NMDA RECEPTOR NR1, NMR, 10 STRUCTURES

Overview

The structures of functional peptides corresponding to the predicted channel-lining M2 segments of the nicotinic acetylcholine receptor (AChR) and of a glutamate receptor of the NMDA subtype (NMDAR) were determined using solution NMR experiments on micelle samples, and solid-state NMR experiments on bilayer samples. Both M2 segments form straight transmembrane alpha-helices with no kinks. The AChR M2 peptide inserts in the lipid bilayer at an angle of 12 degrees relative to the bilayer normal, with a rotation about the helix long axis such that the polar residues face the N-terminal side of the membrane, which is assigned to be intracellular. A model built from these solid-state NMR data, and assuming a symmetric pentameric arrangement of M2 helices, results in a funnel-like architecture for the channel, with the wide opening on the N-terminal intracellular side.

About this Structure

2NR1 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structures of the M2 channel-lining segments from nicotinic acetylcholine and NMDA receptors by NMR spectroscopy., Opella SJ, Marassi FM, Gesell JJ, Valente AP, Kim Y, Oblatt-Montal M, Montal M, Nat Struct Biol. 1999 Apr;6(4):374-9. PMID:10201407

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