1B0K

S642A:FLUOROCITRATE COMPLEX OF ACONITASE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history. 


Literature

The mechanism of aconitase: 1.8 A resolution crystal structure of the S642a:citrate complex.

Lloyd, S.J., Lauble, H., Prasad, G.S., Stout, C.D.

(1999) Protein Sci 8: 2655-2662

  • DOI: 10.1110/ps.8.12.2655
  • Primary Citation of Related Structures:  
    1C97, 1C96, 1B0M, 1B0K, 1B0J

  • PubMed Abstract: 

    • The crystal structure of the S642A mutant of mitochondrial aconitase (mAc) with citrate bound has been determined at 1.8 A resolution and 100 K to capture this binding mode of substrates to the native enzyme. The 2.0 A resolution, 100 K crystal structure of the S642A mutant with isocitrate binding provides a control, showing that the Ser --> Ala replacement does not alter the binding of substrates in the active site ...

    The crystal structure of the S642A mutant of mitochondrial aconitase (mAc) with citrate bound has been determined at 1.8 A resolution and 100 K to capture this binding mode of substrates to the native enzyme. The 2.0 A resolution, 100 K crystal structure of the S642A mutant with isocitrate binding provides a control, showing that the Ser --> Ala replacement does not alter the binding of substrates in the active site. The aconitase mechanism requires that the intermediate product, cis-aconitate, flip over by 180 degrees about the C alpha-C beta double bond. Only one of these two alternative modes of binding, that of the isocitrate mode, has been previously visualized. Now, however, the structure revealing the citrate mode of binding provides direct support for the proposed enzyme mechanism.

    Organizational Affiliation: 

    Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (ACONITASE)A753Sus scrofaMutation(s): 1 
Gene Names: ACO2
EC: 4.2.1.3
UniProt
Find proteins for P16276 (Sus scrofa)
Explore P16276 
Go to UniProtKB:  P16276
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4
Download Ideal Coordinates CCD File 
 C [auth A]IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC		 Ligand Interaction
FLC
Query on FLC
Download Ideal Coordinates CCD File 
 B [auth A]CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K		 Ligand Interaction
O
Query on O
Download Ideal Coordinates CCD File 
 D [auth A]OXYGEN ATOM
O
XLYOFNOQVPJJNP-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 
  • Space Group: B 1 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 187.8α = 90
b = 72.3β = 90
c = 74.1γ = 77.6
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data reduction
X-PLORmodel building
X-PLORrefinement
CCP4data scaling
X-PLORphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-11-18
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2018-04-04
    Changes: Data collection