Crystal structure of Helicobacter pylori 5'-methylthioadenosine/S-adenosyl homocysteine nucleosidase (MTAN) complexed with (3R,4S)-1-((4-amino-5H-pyrrolo[3,2-d]pyrimidin-7-yl)methyl)-4-(((3-(1-benzyl-1H-1,2,3-triazol-4-yl)propyl)thio)methyl)pyrrolidin-3-ol

Experimental Data Snapshot

  • Resolution: 1.45 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 

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This is version 1.3 of the entry. See complete history


Selective Inhibitors of Helicobacter pylori Methylthioadenosine Nucleosidase and Human Methylthioadenosine Phosphorylase.

Harijan, R.K.Hoff, O.Ducati, R.G.Firestone, R.S.Hirsch, B.M.Evans, G.B.Schramm, V.L.Tyler, P.C.

(2019) J Med Chem 62: 3286-3296

  • DOI: https://doi.org/10.1021/acs.jmedchem.8b01642
  • Primary Citation of Related Structures:  
    6DYU, 6DYV, 6DYW, 6DYY, 6DYZ, 6DZ0, 6DZ2, 6DZ3

  • PubMed Abstract: 

    Bacterial 5'-methylthioadenosine/ S-adenosylhomocysteine nucleosidase (MTAN) hydrolyzes adenine from its substrates to form S-methyl-5-thioribose and S-ribosyl-l-homocysteine. MTANs are involved in quorum sensing, menaquinone synthesis, and 5'-methylthioadenosine recycling to S-adenosylmethionine. Helicobacter pylori uses MTAN in its unusual menaquinone pathway, making H. pylori MTAN a target for antibiotic development. Human 5'-methylthioadenosine phosphorylase (MTAP), a reported anticancer target, catalyzes phosphorolysis of 5'-methylthioadenosine to salvage S-adenosylmethionine. Transition-state analogues designed for HpMTAN and MTAP show significant overlap in specificity. Fifteen unique transition-state analogues are described here and are used to explore inhibitor specificity. Several analogues of HpMTAN bind in the picomolar range while inhibiting human MTAP with orders of magnitude weaker affinity. Structural analysis of HpMTAN shows inhibitors extending through a hydrophobic channel to the protein surface. The more enclosed catalytic sites of human MTAP require the inhibitors to adopt a folded structure, displacing the phosphate nucleophile from the catalytic site.

  • Organizational Affiliation

    Department of Biochemistry , Albert Einstein College of Medicine , New York 10461 , New York , United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase
A, B
245Helicobacter pyloriMutation(s): 0 
Gene Names: BW246_00770BZL55_04980CEP79_03920
Find proteins for Q9ZMY2 (Helicobacter pylori (strain J99 / ATCC 700824))
Explore Q9ZMY2 
Go to UniProtKB:  Q9ZMY2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ZMY2
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on OS5

Download Ideal Coordinates CCD File 
J [auth A],
Q [auth B]
C24 H30 N8 O S
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
K [auth B],
L [auth B],
M [auth B],
N [auth B],
O [auth B]
C2 H6 O2
Query on NH4

Download Ideal Coordinates CCD File 
H4 N
Binding Affinity Annotations 
IDSourceBinding Affinity
OS5 Binding MOAD:  6DYW Kd: 0.04 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.45 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.178 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.346α = 90
b = 73.346β = 90
c = 176.378γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata 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: 2019-03-20
    Type: Initial release
  • Version 1.1: 2019-04-10
    Changes: Data collection, Database references
  • Version 1.2: 2019-04-24
    Changes: Data collection, Database references
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Refinement description