5VM7

Pseudo-atomic model of the MurA-A2 complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structures of Q beta virions, virus-like particles, and the Q beta-MurA complex reveal internal coat proteins and the mechanism of host lysis.

Cui, Z.Gorzelnik, K.V.Chang, J.Y.Langlais, C.Jakana, J.Young, R.Zhang, J.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: 11697-11702

  • DOI: 10.1073/pnas.1707102114
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In single-stranded RNA bacteriophages (ssRNA phages) a single copy of the maturation protein binds the genomic RNA (gRNA) and is required for attachment of the phage to the host pilus. For the canonical <i>Allolevivirus </i> Qβ the maturation protei ...

    In single-stranded RNA bacteriophages (ssRNA phages) a single copy of the maturation protein binds the genomic RNA (gRNA) and is required for attachment of the phage to the host pilus. For the canonical Allolevivirus Qβ the maturation protein, A 2 , has an additional role as the lysis protein, by its ability to bind and inhibit MurA, which is involved in peptidoglycan biosynthesis. Here, we determined structures of Qβ virions, virus-like particles, and the Qβ-MurA complex using single-particle cryoelectron microscopy, at 4.7-Å, 3.3-Å, and 6.1-Å resolutions, respectively. We identified the outer surface of the β-region in A 2 as the MurA-binding interface. Moreover, the pattern of MurA mutations that block Qβ lysis and the conformational changes of MurA that facilitate A 2 binding were found to be due to the intimate fit between A 2 and the region encompassing the closed catalytic cleft of substrate-liganded MurA. Additionally, by comparing the Qβ virion with Qβ virus-like particles that lack a maturation protein, we observed a structural rearrangement in the capsid coat proteins that is required to package the viral gRNA in its dominant conformation. Unexpectedly, we found a coat protein dimer sequestered in the interior of the virion. This coat protein dimer binds to the gRNA and interacts with the buried α-region of A 2 , suggesting that it is sequestered during the early stage of capsid formation to promote the gRNA condensation required for genome packaging. These internalized coat proteins are the most asymmetrically arranged major capsid proteins yet observed in virus structures.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Center for Phage Technology, Texas A&M University, College Station, TX 77843.,National Center for Macromolecular Imaging, Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030.,Department of Biochemistry and Biophysics, Center for Phage Technology, Texas A&M University, College Station, TX 77843; junjiez@tamu.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maturation protein A2
A
420Escherichia phage QbetaMutation(s): 0 
Find proteins for Q8LTE2 (Escherichia phage Qbeta)
Go to UniProtKB:  Q8LTE2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
UDP-N-acetylglucosamine 1-carboxyvinyltransferase
B
419Escherichia coli O139:H28 (strain E24377A / ETEC)Mutation(s): 0 
Gene Names: murA
EC: 2.5.1.7
Find proteins for A7ZS86 (Escherichia coli O139:H28 (strain E24377A / ETEC))
Go to UniProtKB:  A7ZS86
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-04-26 
  • Released Date: 2017-10-18 
  • Deposition Author(s): Cui, Z., Zhang, J.

Funding OrganizationLocationGrant Number
Welch FoundationUnited StatesA-1863
National Institutes of Health/National Institute of General Medical SciencesUnited StatesP41GM103832
National Institutes of Health/National Institute of General Medical SciencesUnited StatesU24GM116787
Public Health ServiceUnited StatesGM27099

Revision History 

  • Version 1.0: 2017-10-18
    Type: Initial release
  • Version 1.1: 2018-04-11
    Type: Author supporting evidence, Data collection, Structure summary
  • Version 1.2: 2018-04-18
    Type: Data collection, Database references
  • Version 1.3: 2018-07-18
    Type: Data collection, Experimental preparation