1DL5

PROTEIN-L-ISOASPARTATE O-METHYLTRANSFERASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 
    0.203 (Depositor) 
  • R-Value Work: 
    0.182 (Depositor), 0.177 (DCC) 
  • R-Value Observed: 
    0.182 (Depositor) 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted SAHClick on this verticalbar to view details

This is version 1.4 of the entry. See complete history


Literature

Crystal structure of protein isoaspartyl methyltransferase: a catalyst for protein repair.

Skinner, M.M.Puvathingal, J.M.Walter, R.L.Friedman, A.M.

(2000) Structure 8: 1189-1201

  • DOI: https://doi.org/10.1016/s0969-2126(00)00522-0
  • Primary Citation of Related Structures:  
    1DL5

  • PubMed Abstract: 

    Formation of isoaspartyl residues is one of several processes that damage proteins as they age. Protein L-isoaspartate (D-aspartate) O-methyltransferase (PIMT) is a conserved and nearly ubiquitous enzyme that catalyzes the repair of proteins damaged by isoaspartyl formation. We have determined the first structure of a PIMT from crystals of the T. maritima enzyme complexed to S-adenosyl-L-homocysteine (AdoHcy) and refined it to 1.8 A resolution. Although PIMT forms one structural unit, the protein can be divided functionally into three subdomains. The central subdomain closely resembles other S-adenosyl-L-methionine-dependent methyltransferases but bears a striking alteration of topological connectivity, which is not shared by any other member of this family. Rather than arranged as a mixed beta sheet with topology 6 upward arrow7 downward arrow5 upward arrow4 upward arrow1 upward arrow2 upward arrow3 upward arrow, the central sheet of PIMT is reorganized to 7 upward arrow6 downward arrow5 upward arrow4 upward arrow1 upward arrow2 upward arrow3 upward arrow. AdoHcy is largely buried between the N-terminal and central subdomains by a conserved and largely hydrophobic loop on one rim of the binding cleft, and a conserved Ser/Thr-rich beta strand on the other. The Ser/Thr-rich strand may provide hydrogen bonds for specific interactions with isoaspartyl substrates. The side chain of Ile-206, a conserved residue, crosses the cleft, restricting access to the donor methyl group to a deep well, the putative isoaspartyl methyl acceptor site. The structure of PIMT reveals a unique modification of the methyltransferase fold along with a site for specific recognition of isoaspartyl substrates. The sequence conservation among PIMTs suggests that the current structure should prove a reliable model for understanding the repair of isoaspartyl damage in all organisms.


  • Organizational Affiliation

    Department of Biological Sciences, Purdue University , West Lafayette, IN 47907, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN-L-ISOASPARTATE O-METHYLTRANSFERASE
A, B
317Thermotoga maritimaMutation(s): 0 
EC: 2.1.1.77
UniProt
Find proteins for Q56308 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q56308 
Go to UniProtKB:  Q56308
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ56308
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SAH
Query on SAH

Download Ideal Coordinates CCD File 
L [auth A],
W [auth B]
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
CD
Query on CD

Download Ideal Coordinates CCD File 
C [auth A]
F [auth A]
I [auth A]
J [auth A]
K [auth A]
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
G [auth A]
H [auth A]
N [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free:  0.203 (Depositor) 
  • R-Value Work:  0.182 (Depositor), 0.177 (DCC) 
  • R-Value Observed: 0.182 (Depositor) 
Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.06α = 90
b = 98.91β = 105.66
c = 76.86γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MLPHAREphasing
CNSrefinement

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted SAHClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 1.4: 2024-11-20
    Changes: Data collection, Structure summary