4S28

Crystal structure of Arabidopsis thaliana ThiC with bound aminoimidazole ribonucleotide, S-adenosylhomocysteine, Fe4S4 cluster and Fe

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.137 
  • R-Value Work: 0.116 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history. 

Literature

Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase.

Fenwick, M.K., Mehta, A.P., Zhang, Y., Abdelwahed, S.H., Begley, T.P., Ealick, S.E.

(--) Nat Commun 6: 6480-6480

  • DOI: 10.1038/ncomms7480
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Radical S-adenosylmethionine (SAM) enzymes use a [4Fe-4S] cluster to generate a 5'-deoxyadenosyl radical. Canonical radical SAM enzymes are characterized by a β-barrel-like fold and SAM anchors to the differentiated iron of the cluster, which is loca ...

    Radical S-adenosylmethionine (SAM) enzymes use a [4Fe-4S] cluster to generate a 5'-deoxyadenosyl radical. Canonical radical SAM enzymes are characterized by a β-barrel-like fold and SAM anchors to the differentiated iron of the cluster, which is located near the amino terminus and within the β-barrel, through its amino and carboxylate groups. Here we show that ThiC, the thiamin pyrimidine synthase in plants and bacteria, contains a tethered cluster-binding domain at its carboxy terminus that moves in and out of the active site during catalysis. In contrast to canonical radical SAM enzymes, we predict that SAM anchors to an additional active site metal through its amino and carboxylate groups. Superimposition of the catalytic domains of ThiC and glutamate mutase shows that these two enzymes share similar active site architectures, thus providing strong evidence for an evolutionary link between the radical SAM and adenosylcobalamin-dependent enzyme superfamilies.

    Organizational Affiliation: 

    Department of Chemistry and Chemical Biology, Cornell University, 120 Baker Lab, Ithaca, New York 14853, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phosphomethylpyrimidine synthase, chloroplastic
A
576Arabidopsis thalianaMutation(s): 0 
Gene Names: THIC (PY)
EC: 4.1.99.17
Find proteins for O82392 (Arabidopsis thaliana)
Go to UniProtKB:  O82392
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4
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A
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC
 Ligand Interaction
AIR
Query on AIR
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A
5-AMINOIMIDAZOLE RIBONUCLEOTIDE
C8 H14 N3 O7 P
PDACUKOKVHBVHJ-XVFCMESISA-N
 Ligand Interaction
BU1
Query on BU1
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Download CCD File 
A
1,4-BUTANEDIOL
C4 H10 O2
WERYXYBDKMZEQL-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL
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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
SAH
Query on SAH
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A
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
FE2
Query on FE2
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A
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.137 
  • R-Value Work: 0.116 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 107.071α = 90.00
b = 107.071β = 90.00
c = 87.677γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
PHENIXphasing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-08
    Type: Initial release