The complete structure determination of a polypeptide in a lipid bilayer environment is demonstrated built solely upon orientational constraints derived from solid-state NMR observations. Such constraints are obtained from isotopically labeled samples uniformly aligned with respect to the B(0) field ...
The complete structure determination of a polypeptide in a lipid bilayer environment is demonstrated built solely upon orientational constraints derived from solid-state NMR observations. Such constraints are obtained from isotopically labeled samples uniformly aligned with respect to the B(0) field. Each observation constrains the molecular frame with respect to B(0) and the bilayer normal, which are arranged to be parallel. These constraints are not only very precise ( a few tenths of a degree), but also very accurate. This is clearly demonstrated as the backbone structure is assembled sequentially and the i to i + 6 hydrogen bonds in this structure of the gramicidin channel are shown on average to be within 0.5 A of ideal geometry. Similarly, the side chains are assembled independently and in a radial direction from the backbone. The lack of considerable atomic overlap between side chains also demonstrates the accuracy of the constraints. Through this complete structure, solid-state NMR is demonstrated as an approach for determining three-dimensional macromolecular structure.
Related Citations:
Computational Refinement Through Solid State NMR and Energy Constraints of a Membrane Bound Polypeptide Ketchem, R.R., Roux, B., Cross, T.A. (1996) Biological Membranes: A Molecular Perspective From Computation And Experiment --: 299
Lipid-Peptide Interface: Valine Conformation and Dynamics in the Gramicidin Channel Lee, K.C., Huo, S., Cross, T.A. (1995) Biochemistry 34: 857
Tryptophan Dynamics and Structural Refinement in a Lipid Bilayer Environment: Solid State NMR of the Gramicidin Channel Hu, W., Lazo, N.D., Cross, T.A. (1995) Biochemistry 34: 14138
High-Resolution Conformation of Gramicidin a in a Lipid Bilayer by Solid-State NMR Ketchem, R.R., Hu, W., Cross, T.A. (1993) Science 261: 1457
Organizational Affiliation:
Center for Interdisciplinary Magnetic Resonance, Institute of Molecular Biophysics, Tallahassee, FL, USA.
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