2FB3

Structure of MoaA in complex with 5'-GTP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Binding of 5'-GTP to the C-terminal FeS cluster of the radical S-adenosylmethionine enzyme MoaA provides insights into its mechanism

Haenzelmann, P.Schindelin, H.

(2006) Proc Natl Acad Sci U S A 103: 6829-6834

  • DOI: 10.1073/pnas.0510711103
  • Primary Citation of Related Structures:  
    2FB3, 2FB2

  • PubMed Abstract: 
  • The first step in molybdenum cofactor biosynthesis, the conversion of 5'-GTP to precursor Z, an oxygen-sensitive tetrahydropyranopterin is catalyzed by the S-adenosylmethionine (SAM)-dependent enzyme MoaA and the accessory protein MoaC. This reaction ...

    The first step in molybdenum cofactor biosynthesis, the conversion of 5'-GTP to precursor Z, an oxygen-sensitive tetrahydropyranopterin is catalyzed by the S-adenosylmethionine (SAM)-dependent enzyme MoaA and the accessory protein MoaC. This reaction involves the radical-initiated intramolecular rearrangement of the guanine C8 atom. MoaA harbors an N-terminal [4Fe-4S] cluster, which is involved in the reductive cleavage of SAM and generates a 5'-deoxyadenosyl radical (5'-dA*), and a C-terminal [4Fe-4S] cluster presumably involved in substrate binding and/or activation. Biochemical studies identified residues involved in 5'-GTP binding and the determinants of nucleotide specificity. The crystal structure of MoaA in complex with 5'-GTP confirms the biochemical data and provides valuable insights into the subsequent radical reaction. MoaA binds 5'-GTP with high affinity and interacts through its C-terminal [4Fe-4S] cluster with the guanine N1 and N2 atoms, in a yet uncharacterized binding mode. The tightly anchored triphosphate moiety prevents the escape of radical intermediates. This structure also visualizes the L-Met and 5'-dA cleavage products of SAM. Rotation of the 5'-dA ribose and/or conformational changes of the guanosine are proposed to bring the 5'-deoxyadenosyl radical into close proximity of either the ribose C2' and C3' or the guanine C8 carbon atoms leading to hydrogen abstraction.


    Organizational Affiliation

    Department of Biochemistry and Center for Structural Biology, Stony Brook University, Stony Brook, NY 11794-5215, USA. petra@csb.sunysb.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Molybdenum cofactor biosynthesis protein AAB340Staphylococcus aureusMutation(s): 0 
Gene Names: moaA
EC: 4.1.99.22
Find proteins for P69848 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore P69848 
Go to UniProtKB:  P69848
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download CCD File 
A
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
SF4
Query on SF4

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A, B
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC
 Ligand Interaction
5AD
Query on 5AD

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A
5'-DEOXYADENOSINE
C10 H13 N5 O3
XGYIMTFOTBMPFP-KQYNXXCUSA-N
 Ligand Interaction
POP
Query on POP

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B
PYROPHOSPHATE 2-
H2 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-L
 Ligand Interaction
MET
Query on MET

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A, B
METHIONINE
C5 H11 N O2 S
FFEARJCKVFRZRR-BYPYZUCNSA-N
 Ligand Interaction
SO4
Query on SO4

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A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
GTPKd:  290   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.229 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.015α = 90
b = 103.449β = 90
c = 191.217γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
SCALEPACKdata scaling
FFTmodel building
REFMACrefinement
FFTphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-09
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance