3DF9

Crystal structure of E. coli MTA/SAH nucleosidase in complex with BnT-DADMeImmA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of Staphylococcus aureus 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase

Siu, K.K.Lee, J.E.Smith, G.D.Horvatin-Mrakovcic, C.Howell, P.L.

(2008) Acta Crystallogr.,Sect.F 64: 343-350

  • DOI: 10.1107/S1744309108009275
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 5'-Methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) catalyzes the irreversible cleavage of the glycosidic bond in 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH) and plays a key role in four metabolic processes: biological ...

    5'-Methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) catalyzes the irreversible cleavage of the glycosidic bond in 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH) and plays a key role in four metabolic processes: biological methylation, polyamine biosynthesis, methionine recycling and bacterial quorum sensing. The absence of the nucleosidase in mammalian species has implicated this enzyme as a target for antimicrobial drug design. MTAN from the pathogenic bacterium Staphylococcus aureus (SaMTAN) has been kinetically characterized and its structure has been determined in complex with the transition-state analogue formycin A (FMA) at 1.7 A resolution. A comparison of the SaMTAN-FMA complex with available Escherichia coli MTAN structures shows strong conservation of the overall structure and in particular of the active site. The presence of an extra water molecule, which forms a hydrogen bond to the O4' atom of formycin A in the active site of SaMTAN, produces electron withdrawal from the ribosyl group and may explain the lower catalytic efficiency that SaMTAN exhibits when metabolizing MTA and SAH relative to the E. coli enzyme. The implications of this structure for broad-based antibiotic design are discussed.


    Organizational Affiliation

    Program in Molecular Structure and Function, Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MTA/SAH nucleosidase
A, B
242Escherichia coli O157:H7Mutation(s): 0 
Gene Names: mtnN
EC: 3.2.2.9
Find proteins for P0AF14 (Escherichia coli O157:H7)
Go to UniProtKB:  P0AF14
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DF9
Query on DF9

Download SDF File 
Download CCD File 
A, B
(3R,4S)-1-[(4-amino-5H-pyrrolo[3,2-d]pyrimidin-7-yl)methyl]-4-[(benzylsulfanyl)methyl]pyrrolidin-3-ol
C19 H23 N5 O S
DIGGNILBPCEZIV-CVEARBPZSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DF9Kd: 0 - 1.9 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.611α = 90.00
b = 69.748β = 90.00
c = 127.868γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
REFMACrefinement
CrystalCleardata collection
REFMACphasing
d*TREKdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance