Rotational orientation of monomers within a designed homo-oligomer transmembrane helical bundle.
A peptide designed to form a homo-oligomeric transmembrane helical bundle was reconstituted into lipid bilayers and studied by using (2)H NMR (nuclear magnetic resonance) with magic angle spinning to confirm that the helical interface corresponds to the interface intended in the design. The peptide belongs to a family of model peptides derived from a membrane-solubilized version of the water-soluble coiled-coil GCN4-P1. The variant studied here contains two asparagines thought to engage in interhelical hydrogen bonding critical to the formation of a stable trimer. For the NMR studies, three different peptides were synthesized, each with one of three consecutive leucines in the transmembrane region deuterium labeled. Prior to NMR data collection, polarized infrared spectroscopy was used to establish that the peptides were reconstituted in lipid bilayers in a transmembrane helical conformation. The (2)H NMR line shapes of the three different peptides are consistent with a trimer structure formed by the designed peptide that is stabilized by inter-helical hydrogen bonding of asparagines at positions 7 and 14.
Howard
Kathleen P
KP
Department of Chemistry, Swarthmore College, Swarthmore, PA 19081, USA. khoward1@swarthmore.edu
Liu
Wei
W
Crocker
Evan
E
Nanda
Vikas
V
Lear
James
J
Degrado
William F
WF
Smith
Steven O
SO
D000595:Amino Acid Sequence; D019295:Computational Biology; D003903:Deuterium / Q000737:chemistry; D008565:Membrane Proteins / Q000737:chemistry*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010455:Peptides / Q000737:chemistry; D017433:Protein Structure, Secondary; D012399:Rotation; D017550:Spectroscopy, Fourier Transform Infrared
D008565:Membrane Proteins; D010455:Peptides; D003903:Deuterium
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