Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C6  (3D View)
Global Stoichiometry: Homo 18-mer - A18 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 81.50 kDa 
• Atom Count: 3492 
• Residue Count: 708 
• Unique protein chains: 1

6HWX

Mature MLV capsid hexamer structure in intact virus particles

• DOI: 10.2210/pdb6HWX/pdb
• EMDataResource: EMD-0292

• Classification: VIRAL PROTEIN
• Organism(s): Murine leukemia virus
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2018-10-15 Released: 2018-12-05 
• Deposition Author(s): Qu, K., Glass, B., Dolezal, M., Schur, F.K.M., Rein, A., Rumlova, M., Ruml, T., Kraeusslich, H.G., Briggs, J.A.G.
• Funding Organization(s): German Research Foundation, European Research Council, Medical Research Council (United Kingdom), Czech Science Foundation, Ministry of Education (Czech Republic)

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 7.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SUBTOMOGRAM AVERAGING 

Literature

Structure and architecture of immature and mature murine leukemia virus capsids.

Qu, K., Glass, B., Dolezal, M., Schur, F.K.M., Murciano, B., Rein, A., Rumlova, M., Ruml, T., Krausslich, H.G., Briggs, J.A.G.

(2018) Proc Natl Acad Sci U S A 115: E11751-E11760

• PubMed: 30478053 
• DOI: 10.1073/pnas.1811580115
• Primary Citation of Related Structures:  
  6HWX, 6HWW, 6HWY, 6HWI, 6GZA


• PubMed Abstract: 
  

Retroviruses assemble and bud from infected cells in an immature form and require proteolytic maturation for infectivity. The CA (capsid) domains of the Gag polyproteins assemble a protein lattice as a truncated sphere in the immature virion. Proteolytic cleavage of Gag induces dramatic structural rearrangements; a subset of cleaved CA subsequently assembles into the mature core, whose architecture varies among retroviruses. Murine leukemia virus (MLV) is the prototypical γ-retrovirus and serves as the basis of retroviral vectors, but the structure of the MLV CA layer is unknown. Here we have combined X-ray crystallography with cryoelectron tomography to determine the structures of immature and mature MLV CA layers within authentic viral particles. This reveals the structural changes associated with maturation, and, by comparison with HIV-1, uncovers conserved and variable features. In contrast to HIV-1, most MLV CA is used for assembly of the mature core, which adopts variable, multilayered morphologies and does not form a closed structure. Unlike in HIV-1, there is similarity between protein-protein interfaces in the immature MLV CA layer and those in the mature CA layer, and structural maturation of MLV could be achieved through domain rotations that largely maintain hexameric interactions. Nevertheless, the dramatic architectural change on maturation indicates that extensive disassembly and reassembly are required for mature core growth. The core morphology suggests that wrapping of the genome in CA sheets may be sufficient to protect the MLV ribonucleoprotein during cell entry.

---

Organizational Affiliation: 

Structural Studies Division, Medical Research Council Laboratory of Molecular Biology, CB2 0QH Cambridge, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Putative gag polyprotein	A, B, C	236	Murine leukemia virus	Mutation(s): 0  Gene Names: gag
Find proteins for P03336 (AKV murine leukemia virus) Explore P03336  Go to UniProtKB:  P03336

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 7.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-10-15 
• Released Date: 2018-12-05 
Deposition Author(s): Qu, K., Glass, B., Dolezal, M., Schur, F.K.M., Rein, A., Rumlova, M., Ruml, T., Kraeusslich, H.G., Briggs, J.A.G.

---

Funding Organization	Location	Grant Number
German Research Foundation	Germany	BR 3635/2-1
German Research Foundation	Germany	KR 906/7-1
German Research Foundation	Germany	KR 906/8-1
European Research Council	Germany	ERC-CoG-648432
Medical Research Council (United Kingdom)	United Kingdom	MC_UP_1201/16
Czech Science Foundation	Czech Republic	17-25602S
Ministry of Education (Czech Republic)	Czech Republic	LO1302
Ministry of Education (Czech Republic)	Czech Republic	LO1304
Ministry of Education (Czech Republic)	Czech Republic	LO1601

Revision History 

• Version 1.0: 2018-12-05
  Type: Initial release
  
• Version 1.1: 2018-12-19
  Changes: Data collection, Database references
• Version 1.2: 2019-04-03
  Changes: Data collection, Source and taxonomy