Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.65 kDa 
• Atom Count: 331 
• Residue Count: 40 
• Unique protein chains: 1

6B3U

Solution Structure of HIV-1 GP41 Transmembrane Domain in Bicelles

• DOI: 10.2210/pdb6B3U/pdb
• BMRB: 30349

• Classification: MEMBRANE PROTEIN
• Organism(s): Human immunodeficiency virus 1
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2017-09-24 Released: 2018-01-24 
• Deposition Author(s): Chiliveri, S.C., Louis, J.M., Ghirlando, R., Baber, J.L., Bax, A.
• Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 60 
• Conformers Submitted: 15 
• Selection Criteria: structures with the lowest energy 

Literature

Tilted, Uninterrupted, Monomeric HIV-1 gp41 Transmembrane Helix from Residual Dipolar Couplings.

Chiliveri, S.C., Louis, J.M., Ghirlando, R., Baber, J.L., Bax, A.

(2018) J Am Chem Soc 140: 34-37

• PubMed: 29277995 
• DOI: 10.1021/jacs.7b10245
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Cryo-electron microscopy and X-ray crystallography have shown that the pre- and postfusion states of the HIV-1 gp41 viral coat protein, although very different from one another, each adopt C ₃ symmetric structures. A stable homotrimeric structure for the transmembrane domain (TM) also was modeled and supported by experimental data. For a C ₃ symmetric structure, alignment in an anisotropic medium must be axially symmetric, with the unique axis of the alignment tensor coinciding with the C ₃ axis. However, NMR residual dipolar couplings (RDCs) measured under three different alignment conditions were found to be incompatible with C ₃ symmetry. Subsequent measurements by paramagnetic relaxation enhancement, analytical ultracentrifugation, and DEER EPR, indicate that the transmembrane domain is monomeric. ¹⁵ N NMR relaxation data and RDCs show that TM is highly ordered and uninterrupted for a total length of 32 residues, extending well into the membrane proximal external region.

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Organizational Affiliation: 

Laboratory of Chemical Physics and ‡Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland 20892, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HIV-1 GP41 Transmembrane Domain	A	40	Human immunodeficiency virus 1	Mutation(s): 0  Gene Names: env
Find proteins for Q74849 (Human immunodeficiency virus 1) Go to UniProtKB:  Q74849

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 60 
• Conformers Submitted: 15 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 6B3U Olderado

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-09-24 
• Released Date: 2018-01-24 
Deposition Author(s): Chiliveri, S.C., Louis, J.M., Ghirlando, R., Baber, J.L., Bax, A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)	United States	DK075023-08

Revision History 

• Version 1.0: 2018-01-24
  Type: Initial release
  
• Version 1.1: 2019-12-25
  Changes: Author supporting evidence, Data collection