4OJT

Helicobacter pylori MTAN complexed with S-ribosylhomocysteine and adenine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


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Literature

Crystal structures of the Helicobacter pylori MTAN enzyme reveal specific interactions between S-adenosylhomocysteine and the 5'-alkylthio binding subsite.

Mishra, V.Ronning, D.R.

(2012) Biochemistry 51: 9763-9772

  • DOI: 10.1021/bi301221k
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The bacterial 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) enzyme is a multifunctional enzyme that catalyzes the hydrolysis of the N-ribosidic bond of at least four different adenosine-based metabolites: S-adenosylhomocysteine (S ...

    The bacterial 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) enzyme is a multifunctional enzyme that catalyzes the hydrolysis of the N-ribosidic bond of at least four different adenosine-based metabolites: S-adenosylhomocysteine (SAH), 5'-methylthioadenosine (MTA), 5'-deoxyadenosine (5'-DOA), and 6-amino-6-deoxyfutalosine. These activities place the enzyme at the hub of seven fundamental bacterial metabolic pathways: S-adenosylmethionine (SAM) utilization, polyamine biosynthesis, the purine salvage pathway, the methionine salvage pathway, the SAM radical pathways, autoinducer-2 biosynthesis, and menaquinone biosynthesis. The last pathway makes MTAN essential for Helicobacter pylori viability. Although structures of various bacterial and plant MTANs have been described, the interactions between the homocysteine moiety of SAH and the 5'-alkylthiol binding site of MTAN have never been resolved. We have determined crystal structures of an inactive mutant form of H. pylori MTAN bound to MTA and SAH to 1.63 and 1.20 Å, respectively. The active form of MTAN was also crystallized in the presence of SAH, allowing the determination of the structure of a ternary enzyme-product complex resolved at 1.50 Å. These structures identify interactions between the homocysteine moiety and the 5'-alkylthiol binding site of the enzyme. This information can be leveraged for the development of species-specific MTAN inhibitors that prevent the growth of H. pylori.


    Organizational Affiliation

    Department of Chemistry, University of Toledo, Toledo, OH 43606, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MTA/SAH nucleosidase
A
231Helicobacter pylori (strain J99 / ATCC 700824)Mutation(s): 0 
Gene Names: mtnN (mtn)
EC: 3.2.2.30
Find proteins for Q9ZMY2 (Helicobacter pylori (strain J99 / ATCC 700824))
Go to UniProtKB:  Q9ZMY2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2WP
Query on 2WP

Download SDF File 
Download CCD File 
A
(2S)-2-amino-4-({[(2S,3S,4R,5S)-3,4,5-trihydroxytetrahydrofuran-2-yl]methyl}sulfanyl)butanoic acid
C9 H17 N O6 S
IQFWYNFDWRYSRA-LYNCRYNASA-N
 Ligand Interaction
ADE
Query on ADE

Download SDF File 
Download CCD File 
A
ADENINE
C5 H5 N5
GFFGJBXGBJISGV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 81.241α = 90.00
b = 81.241β = 90.00
c = 67.456γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
HKL-2000data reduction
EPMRphasing
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-26
    Type: Initial release