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 

wwPDB Validation 3D Report Full Report


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: 10.1016/j.jmb.2019.11.002
  • Structures With Same Primary Citation

  • 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 heterot ...

    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. Electronic address: Erik.Debler@jefferson.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Arginine N-methyltransferase, putativeA, C345Trypanosoma brucei brucei TREU927Mutation(s): 0 
Gene Names: TB927.1.4690
EC: 2.1.1
Find proteins for Q4GYA9 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Explore Q4GYA9 
Go to UniProtKB:  Q4GYA9
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Arginine N-methyltransferase, putativeB, D391Trypanosoma brucei brucei TREU927Mutation(s): 0 
Gene Names: Tb10.70.3860
Find proteins for Q38BP3 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1))
Explore Q38BP3 
Go to UniProtKB:  Q38BP3
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAH
Query on SAH

Download CCD File 
A, C
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
TRS
Query on TRS

Download CCD File 
A, C
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
B, D
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,CL-PEPTIDE LINKINGC5 H11 N O2 SeMET
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

View Full Validation Report



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 

  • 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