3IIX

X-ray structure of the FeFe-hydrogenase maturase HydE from T. maritima in complex with methionine and 5'deoxyadenosine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.140 

Starting Model: experimental
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This is version 2.2 of the entry. See complete history


Literature

Unexpected electron transfer mechanism upon AdoMet cleavage in radical SAM proteins

Nicolet, Y.Amara, P.Mouesca, J.-M.Fontecilla-Camps, J.C.

(2009) Proc Natl Acad Sci U S A 

  • DOI: https://doi.org/10.1073/pnas.0904385106
  • Primary Citation of Related Structures:  
    3IIX, 3IIZ

  • PubMed Abstract: 

    Radical S-adenosine-L-methionine (SAM or AdoMet) proteins are involved in chemically difficult reactions including the synthesis of cofactors, the generation of protein radicals, and the maturation of complex organometallic catalytic sites. In the first and common step of the reaction, a conserved [Fe4S4] cluster donates an electron to perform the reductive cleavage of AdoMet into methionine and a reactive radical 5'-dA. species. The latter extracts a hydrogen atom from substrate eliciting one of the about 40 reactions so far characterized for this family of proteins. It has been suggested that the radical-generating mechanism differs depending on whether AdoMet is a cofactor or a substrate. It has also been speculated that electron transfer from the [Fe4S4] cluster to AdoMet is sulfur-based. Here we have used protein crystallography and theoretical calculations to show that regardless whether AdoMet serves as a cofactor or a substrate, the 5'-dA. generating mechanism should be common to the radical SAM proteins studied so far, and that electron transfer is mediated by a unique Fe from the conserved [Fe4S4] cluster. This unusual electron transfer is determined by the sulfonium ion in AdoMet.


  • Organizational Affiliation

    Laboratoire de Cristallographie et Cristallogenèse des Protéines, Institut de Biologie Structurale J.P. Ebel, Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
[FeFe] hydrogenase maturase subunit HydE348Thermotoga maritima MSB8Mutation(s): 1 
Gene Names: TM_1269THEMA_07990Tmari_1274
EC: 1.8
UniProt
Find proteins for Q9X0Z6 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0Z6 
Go to UniProtKB:  Q9X0Z6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0Z6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CPS
Query on CPS

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A]
3-[(3-CHOLAMIDOPROPYL)DIMETHYLAMMONIO]-1-PROPANESULFONATE
C32 H58 N2 O7 S
UMCMPZBLKLEWAF-BCTGSCMUSA-N
SF4
Query on SF4

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B [auth A]IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
5AD
Query on 5AD

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D [auth A]5'-DEOXYADENOSINE
C10 H13 N5 O3
XGYIMTFOTBMPFP-KQYNXXCUSA-N
MET
Query on MET

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C [auth A]METHIONINE
C5 H11 N O2 S
FFEARJCKVFRZRR-BYPYZUCNSA-N
S3H
Query on S3H

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J [auth A]trisulfane
H2 S3
KBMBVTRWEAAZEY-UHFFFAOYSA-N
CO3
Query on CO3

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N [auth A]CARBONATE ION
C O3
BVKZGUZCCUSVTD-UHFFFAOYSA-L
CL
Query on CL

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K [auth A],
L [auth A],
M [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Modified Residues  2 Unique
IDChains TypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
CSS
Query on CSS
A
L-PEPTIDE LINKINGC3 H7 N O2 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.140 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.054α = 90
b = 78.925β = 90
c = 86.192γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2023-04-12
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2023-11-08
    Changes: Data collection, Refinement description
  • Version 2.2: 2023-11-22
    Changes: Data collection