1NC1

Crystal structure of E. coli MTA/AdoHcy nucleosidase complexed with 5'-methylthiotubercidin (MTH)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Escherichia coli 5'-methylthioadenosine/ S-adenosylhomocysteine nucleosidase inhibitor complexes provide insight into the conformational changes required for substrate binding and catalysis.

Lee, J.E.Cornell, K.A.Riscoe, M.K.Howell, P.L.

(2003) J.Biol.Chem. 278: 8761-8770

  • DOI: 10.1074/jbc.M210836200
  • Primary Citation of Related Structures:  1NC3

  • PubMed Abstract: 
  • 5'-Methylthioadenosine/S-adenosylhomocysteine (MTA/AdoHcy) nucleosidase is a key enzyme in a number of critical biological processes in many microbes. This nucleosidase catalyzes the irreversible hydrolysis of the N(9)-C(1') bond of MTA or AdoHcy to ...

    5'-Methylthioadenosine/S-adenosylhomocysteine (MTA/AdoHcy) nucleosidase is a key enzyme in a number of critical biological processes in many microbes. This nucleosidase catalyzes the irreversible hydrolysis of the N(9)-C(1') bond of MTA or AdoHcy to form adenine and the corresponding thioribose. The key role of the MTA/AdoHcy nucleosidase in biological methylation, polyamine biosynthesis, methionine recycling, and bacterial quorum sensing has made it an important antimicrobial drug target. The crystal structures of Escherichia coli MTA/AdoHcy nucleosidase complexed with the transition state analog, formycin A (FMA), and the nonhydrolyzable substrate analog, 5'-methylthiotubercidin (MTT) have been solved to 2.2- and 2.0-A resolution, respectively. These are the first MTA/AdoHcy nucleosidase structures to be solved in the presence of inhibitors. These structures clearly identify the residues involved in substrate binding and catalysis in the active site. Comparisons of the inhibitor complexes to the adenine-bound MTA/AdoHcy nucleosidase (Lee, J. E., Cornell, K. A., Riscoe, M. K., and Howell, P. L. (2001) Structure (Camb.) 9, 941-953) structure provide evidence for a ligand-induced conformational change in the active site and the substrate preference of the enzyme. The enzymatic mechanism has been re-examined.


    Organizational Affiliation

    Structural Biology and Biochemistry, Research Institute, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MTA/SAH nucleosidase
A, B
242Escherichia coli (strain K12)Gene Names: mtnN (mtn, pfs, yadA)
EC: 3.2.2.9
Find proteins for P0AF12 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AF12
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MTH
Query on MTH

Download SDF File 
Download CCD File 
A, B
2-(4-AMINO-PYRROLO[2,3-D]PYRIMIDIN-7-YL)-5-METHYLSULFANYLMETHYL-TETRAHYDRO-FURAN-3,4-DIOL
5'-DEOXY-5'-(METHYLTHIO)-TUBERCIDIN
C12 H16 N4 O3 S
WBPLMFVTQMIPLW-MFYTUXHUSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
MTHKi: 750 nM BINDINGMOAD
MTHKi: 750 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.300α = 90.00
b = 69.300β = 90.00
c = 127.200γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
d*TREKdata scaling
CCDSYSdata reduction
CCDSYSdata collection
CNSphasing
d*TREKdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance