2CJA

Crystal structure of Methanosarcina barkeri seryl-tRNA synthetase complexed with ATP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Structure of the Unusual Seryl-tRNA Synthetase Reveals a Distinct Zinc-Dependent Mode of Substrate Recognition

Bilokapic, S., Maier, T., Ahel, D., Gruic-Sovulj, I., Soll, D., Weygand-Durasevic, I., Ban, N.

(2006) Embo J. 25: 2498

  • DOI: 10.1038/sj.emboj.7601129
  • Primary Citation of Related Structures:  
  • Also Cited By: 3MF2, 3MF1, 3MEY

  • PubMed Abstract: 

    • Methanogenic archaea possess unusual seryl-tRNA synthetase (SerRS), evolutionarily distinct from the SerRSs found in other archaea, eucaryotes and bacteria. The two types of SerRSs show only minimal sequence similarity, primarily within class II cons ...

    Methanogenic archaea possess unusual seryl-tRNA synthetase (SerRS), evolutionarily distinct from the SerRSs found in other archaea, eucaryotes and bacteria. The two types of SerRSs show only minimal sequence similarity, primarily within class II conserved motifs 1, 2 and 3. Here, we report a 2.5 A resolution crystal structure of the atypical methanogenic Methanosarcina barkeri SerRS and its complexes with ATP, serine and the nonhydrolysable seryl-adenylate analogue 5'-O-(N-serylsulfamoyl)adenosine. The structures reveal two idiosyncratic features of methanogenic SerRSs: a novel N-terminal tRNA-binding domain and an active site zinc ion. The tetra-coordinated Zn2+ ion is bound to three conserved protein ligands (Cys306, Glu355 and Cys461) and binds the amino group of the serine substrate. The absolute requirement of the metal ion for enzymatic activity was confirmed by mutational analysis of the direct zinc ion ligands. This zinc-dependent serine recognition mechanism differs fundamentally from the one employed by the bacterial-type SerRSs. Consequently, SerRS represents the only known aminoacyl-tRNA synthetase system that evolved two distinct mechanisms for the recognition of the same amino-acid substrate.

    Organizational Affiliation: 

    Department of Chemistry, University of Zagreb, Zagreb, Croatia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERYL-TRNA SYNTHETASE
A, B
522Methanosarcina barkeri (strain Fusaro / DSM 804)Mutation(s): 0 
Gene Names: serS2
EC: 6.1.1.11
Find proteins for Q46AN5 (Methanosarcina barkeri (strain Fusaro / DSM 804))
Go to UniProtKB:  Q46AN5
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP
Download SDF File 
Download CCD File 
A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
ZN
Query on ZN
Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL
Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG
Download SDF File 
Download CCD File 
B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.203 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 97.314α = 90.00
b = 97.314β = 90.00
c = 270.051γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance