1LON

Crystal Structure of the Recombinant Mouse-Muscle Adenylosuccinate Synthetase Complexed with 6-phosphoryl-IMP, GDP and Hadacidin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

IMP, GTP, and 6-phosphoryl-IMP complexes of recombinant mouse muscle adenylosuccinate synthetase.

Iancu, C.V.Borza, T.Fromm, H.J.Honzatko, R.B.

(2002) J.Biol.Chem. 277: 26779-26787

  • DOI: 10.1074/jbc.M203730200
  • Primary Citation of Related Structures:  1IWE, 1LNY, 1LOO

  • PubMed Abstract: 
  • Prokaryotes have a single form of adenylosuccinate synthetase that controls the committed step of AMP biosynthesis, but vertebrates have two isozymes of the synthetase. The basic isozyme, which predominates in muscle, participates in the purine nucle ...

    Prokaryotes have a single form of adenylosuccinate synthetase that controls the committed step of AMP biosynthesis, but vertebrates have two isozymes of the synthetase. The basic isozyme, which predominates in muscle, participates in the purine nucleotide cycle, has an active site conformation different from that of the Escherichia coli enzyme, and exhibits significant differences in ligand recognition. Crystalline complexes presented here of the recombinant basic isozyme from mouse show the following. GTP alone binds to the active site without inducing a conformational change. IMP in combination with an acetate anion induces major conformational changes and organizes the active site for catalysis. IMP, in the absence of GTP, binds to the GTP pocket of the synthetase. The combination of GTP and IMP results in the formation of a stable complex of 6-phosphoryl-IMP and GDP in the presence or absence of hadacidin. The response of the basic isozyme to GTP alone differs from that of synthetases from plants, and yet the conformation of the mouse basic and E. coli synthetases in their complexes with GDP, 6-phosphoryl-IMP, and hadacidin are nearly identical. Hence, reported differences in ligand recognition among synthetases probably arise from conformational variations observed in partially ligated enzymes.


    Organizational Affiliation

    Department of Biochemistry, Biophysics, and Molecular Biology, Molecular Biology Building, Iowa State University, Ames, IA 50011, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
adenylosuccinate synthetase
A
457Mus musculusGene Names: Adssl1 (Adss1)
EC: 6.3.4.4
Find proteins for P28650 (Mus musculus)
Go to UniProtKB:  P28650
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

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Download CCD File 
A
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
IMO
Query on IMO

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Download CCD File 
A
6-O-PHOSPHORYL INOSINE MONOPHOSPHATE
C10 H14 N4 O11 P2
RXRZOKQPANIEDW-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
HDA
Query on HDA

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Download CCD File 
A
HADACIDIN
C3 H5 N O4
URJHVPKUWOUENU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.224 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 70.780α = 90.00
b = 70.780β = 90.00
c = 195.630γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance