1JUK

INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS IN A TRIGONAL CRYSTAL FORM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of indole-3-glycerol phosphate synthase from the hyperthermophilic archaeon Sulfolobus solfataricus in three different crystal forms: effects of ionic strength.

Knochel, T.R.Hennig, M.Merz, A.Darimont, B.Kirschner, K.Jansonius, J.N.

(1996) J.Mol.Biol. 262: 502-515

  • DOI: 10.1006/jmbi.1996.0531
  • Primary Citation of Related Structures:  1JUL

  • PubMed Abstract: 
  • Indole-3-glycerol phosphate synthase from the hyperthermophilic archaeon Sulfolobus solfataricus is a monomeric enzyme with the common (beta/alpha)8-fold. Recently, its three-dimensional structure was solved in an orthorhombic crystal form, grown by ...

    Indole-3-glycerol phosphate synthase from the hyperthermophilic archaeon Sulfolobus solfataricus is a monomeric enzyme with the common (beta/alpha)8-fold. Recently, its three-dimensional structure was solved in an orthorhombic crystal form, grown by using 1.3 M ammonium sulfate as precipitating agent. Here we describe the X-ray structure analysis of two new crystal forms of this enzyme that were obtained at medium and low ionic strength, respectively. Hexagonal crystals with space group P3(1)21 and cell dimensions a = 62.4 A, b = 62.4 A, c = 122.9 A, gamma = 120 degrees grew in 0.1 M Mes buffer at pH 6.0 with 30% polyethylene glycol monomethylether as precipitant and 0.2 M ammonium sulfate as co-precipitant. A second crystal form with space group P2(1)2(1)2(1) and cell constants a = 62.6 A, b = 74.0 A, c = 74.2 A was obtained using polyethylene glycol and ethylene glycol as precipitants in 0.1 M Mes buffer at pH 6.5. Both structures were solved by molecular replacement and refined at 2.5 A and 2.0 A resolution, respectively. Although the global folds are almost identical, alternative conformations are observed in flexible loop regions, mostly stabilized by crystal contacts. In none of the three crystal forms is the so-called phosphate binding site empty, suggesting that this position has high affinity for anions with tetrahedrally arranged oxygen atoms. Differences in ionic strength of the crystallization buffer have only minor effects on number and specificity of intramolecular salt bridges. The crystal packing, on the other hand, seems to be influenced by the ionic strength of the solvent, since the number of intermolecular salt bridges in the low ionic strength crystal forms is significantly higher.


    Related Citations: 
    • 2.0 A Structure of Indole-3-Glycerol Phosphate Synthase from the Hyperthermophile Sulfolobus Solfataricus: Possible Determinants of Protein Stability
      Hennig, M.,Darimont, B.,Sterner, R.,Kirschner, K.,Jansonius, J.N.
      (1995) Structure 3: 1295


    Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE
A
248Sulfolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)Gene Names: trpC
EC: 4.1.1.48
Find proteins for Q06121 (Sulfolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Go to UniProtKB:  Q06121
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Work: 0.177 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 62.400α = 90.00
b = 62.400β = 90.00
c = 122.900γ = 120.00
Software Package:
Software NamePurpose
CCP4data scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-07-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance