6NHJ

Atomic structures and deletion mutant reveal different capsid-binding patterns and functional significance of tegument protein pp150 in murine and human cytomegaloviruses with implications for therapeutic development


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Atomic structures and deletion mutant reveal different capsid-binding patterns and functional significance of tegument protein pp150 in murine and human cytomegaloviruses with implications for therapeutic development.

Liu, W.Dai, X.Jih, J.Chan, K.Trang, P.Yu, X.Balogun, R.Mei, Y.Liu, F.Zhou, Z.H.

(2019) PLoS Pathog 15: e1007615-e1007615

  • DOI: 10.1371/journal.ppat.1007615
  • Primary Citation of Related Structures:  
    6NHJ

  • PubMed Abstract: 
  • Cytomegalovirus (CMV) infection causes birth defects and life-threatening complications in immunosuppressed patients. Lack of vaccine and need for more effective drugs have driven widespread ongoing therapeutic development efforts against human CMV (HCMV), mostly using murine CMV (MCMV) as the model system for preclinical animal tests ...

    Cytomegalovirus (CMV) infection causes birth defects and life-threatening complications in immunosuppressed patients. Lack of vaccine and need for more effective drugs have driven widespread ongoing therapeutic development efforts against human CMV (HCMV), mostly using murine CMV (MCMV) as the model system for preclinical animal tests. The recent publication (Yu et al., 2017, DOI: 10.1126/science.aam6892) of an atomic model for HCMV capsid with associated tegument protein pp150 has infused impetus for rational design of novel vaccines and drugs, but the absence of high-resolution structural data on MCMV remains a significant knowledge gap in such development efforts. Here, by cryoEM with sub-particle reconstruction method, we have obtained the first atomic structure of MCMV capsid with associated pp150. Surprisingly, the capsid-binding patterns of pp150 differ between HCMV and MCMV despite their highly similar capsid structures. In MCMV, pp150 is absent on triplex Tc and exists as a "Λ"-shaped dimer on other triplexes, leading to only 260 groups of two pp150 subunits per capsid in contrast to 320 groups of three pp150 subunits each in a "Δ"-shaped fortifying configuration. Many more amino acids contribute to pp150-pp150 interactions in MCMV than in HCMV, making MCMV pp150 dimer inflexible thus incompatible to instigate triplex Tc-binding as observed in HCMV. While pp150 is essential in HCMV, our pp150-deletion mutant of MCMV remained viable though with attenuated infectivity and exhibiting defects in retaining viral genome. These results thus invalidate targeting pp150, but lend support to targeting capsid proteins, when using MCMV as a model for HCMV pathogenesis and therapeutic studies.


    Organizational Affiliation

    California NanoSystems Institute, UCLA, Los Angeles, California, United States of America.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Major capsid protein
A, B, C, D, E, F, G, H
1353Murine cytomegalovirus (strain Smith)Mutation(s): 0 
UniProt
Find proteins for A0A1S5YGR4 (Murid herpesvirus 1)
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tegument proteinQ [auth 2], R [auth 3], S [auth e], U [auth f], W [auth g], T [auth h], V [auth i], X [auth j]718Murine cytomegalovirus (strain Smith)Mutation(s): 0 
Gene Names: M32
UniProt
Find proteins for D3XDM2 (Murid herpesvirus 1 (strain Smith))
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Small capsomere-interacting protein98Murine cytomegalovirus (strain Smith)Mutation(s): 0 
Gene Names: m48.2SCP
UniProt
Find proteins for D3XDN6 (Murid herpesvirus 1 (strain Smith))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Minor capsid proteinPA [auth S], QA [auth T], RA [auth U], SA [auth V], OA [auth y]294Murine cytomegalovirus (strain Smith)Mutation(s): 0 
Gene Names: M46
UniProt
Find proteins for D3XDN4 (Murid herpesvirus 1 (strain Smith))
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Triplex capsid protein 2311Murine cytomegalovirus (strain Smith)Mutation(s): 0 
Gene Names: M85TRX2
UniProt
Find proteins for D3XDR2 (Murid herpesvirus 1 (strain Smith))
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR)United StatesDE025567, DE023935, and DE025462
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI069015
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM071940
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1S10RR23057
National Science Foundation (NSF, United States)United StatesDMR-1548924

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-06
    Type: Initial release
  • Version 1.1: 2019-11-27
    Changes: Author supporting evidence