1A59

COLD-ACTIVE CITRATE SYNTHASE

• PDB DOI: https://doi.org/10.2210/pdb1A59/pdb

• Classification: COLD-ACTIVITY
• Organism(s): Antarctic bacterium DS2-3R
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-02-20 Released: 1999-03-30 
• Deposition Author(s): Russell, R.J.M., Gerike, U., Danson, M.J., Hough, D.W., Taylor, G.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.09 Å
• R-Value Free: 0.236 
• R-Value Work: 0.184 
• R-Value Observed: 0.184 

Literature

Structural adaptations of the cold-active citrate synthase from an Antarctic bacterium.

Russell, R.J., Gerike, U., Danson, M.J., Hough, D.W., Taylor, G.L.

(1998) Structure 6: 351-361

• PubMed: 9551556 
• DOI: https://doi.org/10.1016/s0969-2126(98)00037-9
• Primary Citation of Related Structures:  
  1A59


• PubMed Abstract: 
  

  The structural basis of adaptation of enzymes to low temperature is poorly understood. Dimeric citrate synthase has been used as a model enzyme to study the structural basis of thermostability, the structure of the enzyme from organisms living in habitats at 55 degrees C and 100 degrees C having previously been determined. Here the study is extended to include a citrate synthase from an Antarctic bacterium, allowing us to explore the structural basis of cold activity and thermostability across the whole temperature range over which life is known to exit.

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Organizational Affiliation: 

Department of Biology and Biochemistry, University of Bath, UK.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 42.71 kDa 
• Atom Count: 2,951 
• Modelled Residue Count: 377 
• Deposited Residue Count: 378 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CITRATE SYNTHASE	A	378	Antarctic bacterium DS2-3R	Mutation(s): 0
UniProt
Find proteins for O34002 (Antarctic bacterium DS2-3R) Explore O34002  Go to UniProtKB:  O34002

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
COA	B [auth A]	COENZYME A C21 H36 N7 O16 P3 S RGJOEKWQDUBAIZ-IBOSZNHHSA-N
CIT	C [auth A]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.09 Å
• R-Value Free: 0.236 
• R-Value Work: 0.184 
• R-Value Observed: 0.184 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.8	α = 90
b = 70.8	β = 90
c = 307.8	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-03-30 
Deposition Author(s): Russell, R.J.M., Gerike, U., Danson, M.J., Hough, D.W., Taylor, G.L.

Revision History  

• Version 1.0: 1999-03-30
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references, Derived calculations, Other