Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 45.81 kDa 
• Atom Count: 3,254 
• Modelled Residue Count: 414 
• Deposited Residue Count: 416 
• Unique protein chains: 1

 3ICD

STRUCTURE OF A BACTERIAL ENZYME REGULATED BY PHOSPHORYLATION, ISOCITRATE DEHYDROGENASE

• PDB DOI: 10.2210/pdb3ICD/pdb

• Classification: OXIDOREDUCTASE (NAD(A)-CHOH(D))
• Organism(s): Escherichia coli
• Mutation(s): No 


• Deposited: 1989-12-28 Released: 1991-01-15 
• Deposition Author(s): Hurley, J.H., Thorsness, P.E., Ramalingam, V., Helmers, N.H., Koshlandjunior, D.E., Stroud, R.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Work: 0.180 

Literature

Structure of a bacterial enzyme regulated by phosphorylation, isocitrate dehydrogenase.

Hurley, J.H., Thorsness, P.E., Ramalingam, V., Helmers, N.H., Koshland Jr., D.E., Stroud, R.M.

(1989) Proc Natl Acad Sci U S A 86: 8635-8639

• PubMed: 2682654 
• DOI: 10.1073/pnas.86.22.8635
• Primary Citation of Related Structures:  
  3ICD


• PubMed Abstract: 
  

The structure of isocitrate dehydrogenase [threo-DS-isocitrate: NADP+ oxidoreductase (decarboxylating), EC 1.1.1.42] from Escherichia coli has been solved and refined at 2.5 A resolution and is topologically different from that of any other dehydrogenase. This enzyme, a dimer of identical 416-residue subunits, is inactivated by phosphorylation at Ser-113, which lies at the edge of an interdomain pocket that also contains many residues conserved between isocitrate dehydrogenase and isopropylmalate dehydrogenase. Isocitrate dehydrogenase contains an unusual clasp-like domain in which both polypeptide chains in the dimer interlock. Based on the structure of isocitrate dehydrogenase and conservation with isopropylmalate dehydrogenase, we suggest that the active site lies in an interdomain pocket close to the phosphorylation site.

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Related Citations: 

• Regulation of Isocitrate Dehydrogenase by Phosphorylation Involves No Long-Range Conformational Change in the Free Enzyme
  Hurley, J.H., Dean, A.M., Thorsness, P.E., Koshlandjunior, D.E., Stroud, R.M.
  (1990) J Biol Chem 265: 3599

• Regulation of an Enzyme by Phosphorylation at the Active Site
  Hurley, J.H., Dean, A.M., Sohl, J.L., Koshlandjunior, D.E., Stroud, R.M.
  (1990) Science 249: 1012

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ISOCITRATE DEHYDROGENASE	A	416	Escherichia coli	Mutation(s): 0  EC: 1.1.1.42
UniProt
Find proteins for P08200 (Escherichia coli (strain K12)) Explore P08200  Go to UniProtKB:  P08200

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Work: 0.180 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 105.1	α = 90
b = 105.1	β = 90
c = 150.3	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1991-01-15 
Deposition Author(s): Hurley, J.H., Thorsness, P.E., Ramalingam, V., Helmers, N.H., Koshlandjunior, D.E., Stroud, R.M.

Revision History  

• Version 1.0: 1991-01-15
  Type: Initial release
  
• Version 1.1: 2008-03-25
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other