Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.76 kDa 
• Atom Count: 272 
• Residue Count: 32 
• Unique protein chains: 1

1MAG

GRAMICIDIN A IN HYDRATED DMPC BILAYERS, SOLID STATE NMR

• DOI: 10.2210/pdb1MAG/pdb

• Classification: ANTIBIOTIC
• Organism(s): Brevibacillus brevis
• Mutation(s): No 


• Deposited: 1996-06-06 Released: 1997-01-11 
• Deposition Author(s): Ketchem, R.R., Roux, B., Cross, T.A.

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Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Submitted: 1 

Literature

Macromolecular Structural Elucidation with Solid-State NMR-Derived Orientational Constraints.

Ketchem, R.R., Lee, K.C., Huo, S., Cross, T.A.

(1996) J Biomol NMR 8: 1

• PubMed: 8810522 
• DOI: 10.1007/BF00198135
• Primary Citation of Related Structures:  
  1MAG


• PubMed Abstract: 
  

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.

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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

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Organizational Affiliation: 

Center for Interdisciplinary Magnetic Resonance, Institute of Molecular Biophysics, Tallahassee, FL, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GRAMICIDIN A	A, B	16	Brevibacillus brevis	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
FVA	A,B	L-PEPTIDE LINKING	C6 H11 N O3		VAL

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 1
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000150	A, B	GRAMICIDIN A	Polypeptide /  Antibiotic		--

Experimental Data & Validation

Experimental Data

• Method: SOLID-STATE NMR
• Conformers Submitted: 1 
• OLDERADO: 1MAG Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-06-06 
• Released Date: 1997-01-11 
Deposition Author(s): Ketchem, R.R., Roux, B., Cross, T.A.

Revision History 

• Version 1.0: 1997-01-11
  Type: Initial release
  
• Version 1.1: 2011-06-14
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2011-07-27
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
• Version 1.4: 2012-12-12
  Changes: Other
• Version 1.5: 2017-12-20
  Changes: Database references, Other
• Version 1.6: 2018-03-14
  Changes: Data collection, Derived calculations, Refinement description