6P5B

Crystal Structure of MavC in Complex with Ub-UbE2N

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report



Literature

Legionella effector MavC targets the Ube2N~Ub conjugate for noncanonical ubiquitination.

Puvar, K., Iyer, S., Fu, J., Kenny, S., Negron Teron, K.I., Luo, Z.Q., Brzovic, P.S., Klevit, R.E., Das, C.

(2020) Nat Commun 11: 2365-2365

  • DOI: 10.1038/s41467-020-16211-x
  • Primary Citation of Related Structures:  
    6P5H, 6P5B, 6ULH, 6UMP, 6UMS

  • PubMed Abstract: 

    • The bacterial effector MavC modulates the host immune response by blocking Ube2N activity employing an E1-independent ubiquitin ligation, catalyzing formation of a γ-glutamyl-ε-Lys (Gln40 Ub -Lys92 Ube2N ) isopeptide crosslink using ...

    The bacterial effector MavC modulates the host immune response by blocking Ube2N activity employing an E1-independent ubiquitin ligation, catalyzing formation of a γ-glutamyl-ε-Lys (Gln40 Ub -Lys92 Ube2N ) isopeptide crosslink using a transglutaminase mechanism. Here we provide biochemical evidence in support of MavC targeting the activated, thioester-linked Ube2N~ubiquitin conjugate, catalyzing an intramolecular transglutamination reaction, covalently crosslinking the Ube2N and Ub subunits effectively inactivating the E2~Ub conjugate. Ubiquitin exhibits weak binding to MavC alone, but shows an increase in affinity when tethered to Ube2N in a disulfide-linked substrate that mimics the charged E2~Ub conjugate. Crystal structures of MavC in complex with the substrate mimic and crosslinked product provide insights into the reaction mechanism and underlying protein dynamics that favor transamidation over deamidation, while revealing a crucial role for the structurally unique insertion domain in substrate recognition. This work provides a structural basis of ubiquitination by transglutamination and identifies this enzyme's true physiological substrate.

    Organizational Affiliation: 

    Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA. cdas@purdue.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MavC A389Legionella pneumophilaMutation(s): 1 
Gene Names: C3927_10720
Find proteins for Q5ZTL4 (Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513))
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Go to UniProtKB:  Q5ZTL4
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-conjugating enzyme E2 N C152Homo sapiensMutation(s): 0 
Gene Names: UBE2N, BLU
EC: 2.3.2.23
Find proteins for P61088 (Homo sapiens)
Explore P61088 
Go to UniProtKB:  P61088
NIH Common Fund Data Resources
PHAROS:  P61088
GTEx:  ENSG00000177889
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin E76Homo sapiensMutation(s): 0 
Gene Names: UBC
Find proteins for P0CG48 (Homo sapiens)
Explore P0CG48 
Go to UniProtKB:  P0CG48
NIH Common Fund Data Resources
PHAROS:  P0CG48
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 147.844α = 90
b = 147.844β = 90
c = 53.228γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R01GM126296-02

Revision History 

  • Version 1.0: 2020-05-27
    Type: Initial release