Biological Assembly 1  

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Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 7879.75 
• Atom Count: 555 
• Residue Count: 68 
• Unique protein chains: 1

1SZT

ATOMIC STRUCTURE OF A THERMOSTABLE SUBDOMAIN OF HIV-1 GP41

• DOI: 10.2210/pdb1SZT/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Human immunodeficiency virus 1
• Expression System: Escherichia coli


• Deposited: 1997-07-28 Released: 1997-12-24 
• Deposition Author(s): Tan, K., Lu, M., Wang, J.-H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.269 
• R-Value Work: 0.208 

Literature

Atomic structure of a thermostable subdomain of HIV-1 gp41.

Tan, K., Liu, J., Wang, J., Shen, S., Lu, M.

(1997) Proc.Natl.Acad.Sci.USA 94: 12303-12308

• PubMed: 9356444 
• DOI: 10.1073/pnas.94.23.12303
• Also Cited By: 1CE0


• PubMed Abstract: 
  

Infection by HIV-1 involves the fusion of viral and cellular membranes with subsequent transfer of viral genetic material into the cell. The HIV-1 envelope glycoprotein that mediates fusion consists of the surface subunit gp120 and the transmembrane subunit gp41. gp120 directs virion attachment to the cell-surface receptors, and gp41 then promotes viral-cell membrane fusion. A soluble, alpha-helical, trimeric complex within gp41 composed of N-terminal and C-terminal extraviral segments has been proposed to represent the core of the fusion-active conformation of the HIV-1 envelope. A thermostable subdomain denoted N34(L6)C28 can be formed by the N-34 and C-28 peptides connected by a flexible linker in place of the disulfide-bonded loop region. Three-dimensional structure of N34(L6)C28 reveals that three molecules fold into a six-stranded helical bundle. Three N-terminal helices within the bundle form a central, parallel, trimeric coiled coil, whereas three C-terminal helices pack in the reverse direction into three hydrophobic grooves on the surface of the N-terminal trimer. This thermostable subdomain displays the salient features of the core structure of the isolated gp41 subunit and thus provides a possible target for therapeutics designed selectively to block HIV-1 entry.

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Related Citations: 

• Core Structure of Gp41 from the HIV Envelope Glycoprotein
  Chan, D.C.,Fass, D.,Berger, J.M.,Kim, P.S.
  (1997) Cell 89: 263
• Atomic Structure of the Ectodomain from HIV-1 Gp41
  Weissenhorn, W.,Dessen, A.,Harrison, S.C.,Skehel, J.J.,Wiley, D.C.
  (1997) Nature 387: 426
• A Trimeric Structural Domain of the HIV-1 Transmembrane Glycoprotein
  Lu, M.,Blacklow, S.C.,Kim, P.S.
  (1995) Nat.Struct.Mol.Biol. 2: 1075




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Organizational Affiliation: 

Laboratory of Immunobiology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HIV-1 ENVELOPE GLYCOPROTEIN GP41	A	68	Human immunodeficiency virus 1	Mutation(s): 0  Gene Names: env
Find proteins for Q3I1N2 (Human immunodeficiency virus 1) Go to UniProtKB:  Q3I1N2

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.269 
• R-Value Work: 0.208 
• Space Group: H 3

Unit Cell:

Length (Å)	Angle (°)
a = 53.070	α = 90.00
b = 53.070	β = 90.00
c = 60.580	γ = 120.00

Software Package:

Software Name	Purpose
DENZO	data reduction
X-PLOR	model building
X-PLOR	phasing
SCALEPACK	data scaling
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-07-28 
• Released Date: 1997-12-24 
• Deposition Author(s): Tan, K., Lu, M., Wang, J.-H.

Revision History 

• Version 1.0: 1997-12-24
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance