6DNZ

Trypanosoma brucei PRMT1 enzyme-prozyme heterotetrameric complex with AdoHcy


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 

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This is version 1.3 of the entry. See complete history


Literature

Structural Basis of Protein Arginine Methyltransferase Activation by a Catalytically Dead Homolog (Prozyme).

Hashimoto, H.Kafkova, L.Raczkowski, A.Jordan, K.D.Read, L.K.Debler, E.W.

(2020) J Mol Biol 432: 410-426

  • DOI: https://doi.org/10.1016/j.jmb.2019.11.002
  • Primary Citation of Related Structures:  
    6DNZ

  • PubMed Abstract: 

    Prozymes are pseudoenzymes that stimulate the function of weakly active enzymes through complex formation. The major Trypanosoma brucei protein arginine methyltransferase, TbPRMT1 enzyme (ENZ), requires TbPRMT1 prozyme (PRO) to form an active heterotetrameric complex. Here, we present the X-ray crystal structure of the TbPRMT1 ENZ-Δ52PRO tetrameric complex with the cofactor product S-adenosyl-l-homocysteine (AdoHcy) at 2.4 Å resolution. The individual ENZ and PRO units adopt the highly-conserved PRMT domain architecture and form an antiparallel heterodimer that corresponds to the canonical homodimer observed in all previously reported PRMTs. In turn, two such heterodimers assemble into a tetramer both in the crystal and in solution with twofold rotational symmetry. ENZ is unstable in absence of PRO and incapable of forming a homodimer due to a steric clash of an ENZ-specific tyrosine within the dimerization arm, rationalizing why PRO is required to complement ENZ to form a PRMT dimer that is necessary, but not sufficient for PRMT activity. The PRO structure deviates from other, active PRMTs in that it lacks the conserved η2 3 10 -helix within the Rossmann fold, abolishing cofactor binding. In addition to its chaperone function for ENZ, PRO substantially contributes to substrate binding. Heterotetramerization is required for catalysis, as heterodimeric ENZ-PRO mutants lack binding affinity and methyltransferase activity toward the substrate protein TbRGG1. Together, we provide a structural basis for TbPRMT1 ENZ activation by PRO heterotetramer formation, which is conserved across all kinetoplastids, and describe a chaperone function of the TbPRMT1 prozyme, which represents a novel mode of PRMT regulation.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arginine N-methyltransferase, putative
A, C
345Trypanosoma brucei brucei TREU927Mutation(s): 0 
Gene Names: TB927.1.4690
UniProt
Find proteins for Q4GYA9 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Explore Q4GYA9 
Go to UniProtKB:  Q4GYA9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4GYA9
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Arginine N-methyltransferase, putative
B, D
391Trypanosoma brucei brucei TREU927Mutation(s): 0 
Gene Names: Tb10.70.3860
UniProt
Find proteins for Q38BP3 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Explore Q38BP3 
Go to UniProtKB:  Q38BP3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ38BP3
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 196.582α = 90
b = 65.904β = 106.9
c = 141.028γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
AutoSolphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI060260

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-12
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.2: 2019-12-25
    Changes: Database references
  • Version 1.3: 2020-02-12
    Changes: Database references