1CH8

STRUCTURE OF ADENYLOSUCCINATE SYNTHETASE FROM E. COLI COMPLEXED WITH A STRINGENT EFFECTOR, PPG2':3'P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Effectors of the stringent response target the active site of Escherichia coli adenylosuccinate synthetase.

Hou, Z.Cashel, M.Fromm, H.J.Honzatko, R.B.

(1999) J Biol Chem 274: 17505-17510

  • DOI: 10.1074/jbc.274.25.17505
  • Primary Citation of Related Structures:  
    1CH8, 1CIB

  • PubMed Abstract: 
  • Guanosine 5'-diphosphate 3'-diphosphate (ppGpp), a pleiotropic effector of the stringent response, potently inhibits adenylosuccinate synthetase from Escherichia coli as an allosteric effector and/or as a competitive inhibitor with respect to GTP. Crystals of the synthetase grown in the presence of IMP, hadacidin, NO3-, and Mg2+, then soaked with ppGpp, reveal electron density at the GTP pocket which is consistent with guanosine 5'-diphosphate 2':3'-cyclic monophosphate ...

    Guanosine 5'-diphosphate 3'-diphosphate (ppGpp), a pleiotropic effector of the stringent response, potently inhibits adenylosuccinate synthetase from Escherichia coli as an allosteric effector and/or as a competitive inhibitor with respect to GTP. Crystals of the synthetase grown in the presence of IMP, hadacidin, NO3-, and Mg2+, then soaked with ppGpp, reveal electron density at the GTP pocket which is consistent with guanosine 5'-diphosphate 2':3'-cyclic monophosphate. Unlike ligand complexes of the synthetase involving IMP and GDP, the coordination of Mg2+ in this complex is octahedral with the side chain of Asp13 in the inner sphere of the cation. The cyclic phosphoryl group interacts directly with the side chain of Lys49 and indirectly through bridging water molecules with the side chains of Asn295 and Arg305. The synthetase either directly facilitates the formation of the cyclic nucleotide or scavenges trace amounts of the cyclic nucleotide from solution. Regardless of its mode of generation, the cyclic nucleotide binds far more tightly to the active site than does ppGpp. Conceivably, synthetase activity in vivo during the stringent response may be sensitive to the relative concentrations of several effectors, which together exercise precise control over the de novo synthesis of AMP.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Iowa State University, Ames, Iowa 50011, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (ADENYLOSUCCINATE SYNTHETASE)A431Escherichia coli K-12Mutation(s): 0 
Gene Names: purAadeKb4177JW4135
EC: 6.3.4.4
UniProt
Find proteins for P0A7D4 (Escherichia coli (strain K12))
Explore P0A7D4 
Go to UniProtKB:  P0A7D4
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GPX
Query on GPX

Download Ideal Coordinates CCD File 
D [auth A]GUANOSINE 5'-DIPHOSPHATE 2':3'-CYCLIC MONOPHOSPHATE
C10 H14 N5 O13 P3
NGYWTCOGOZELRS-UUOKFMHZSA-N
 Ligand Interaction
IMP
Query on IMP

Download Ideal Coordinates CCD File 
F [auth A]INOSINIC ACID
C10 H13 N4 O8 P
GRSZFWQUAKGDAV-KQYNXXCUSA-N
 Ligand Interaction
HDA
Query on HDA

Download Ideal Coordinates CCD File 
E [auth A]HADACIDIN
C3 H5 N O4
URJHVPKUWOUENU-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download Ideal Coordinates CCD File 
B [auth A]NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
GPXKi :  100   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.3α = 90
b = 80.3β = 90
c = 158.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-GENdata reduction
X-GENdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-29
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description