ISDA

Deposition Date 1989-12-28

Release Date 1991-01-15

Last Version Date 2024-02-21

Entry Detail

PDB ID:

3ICD

Keywords:

OXIDOREDUCTASE (NAD(A)-CHOH(D))

Title:

STRUCTURE OF A BACTERIAL ENZYME REGULATED BY PHOSPHORYLATION, ISOCITRATE DEHYDROGENASE

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Work:

0.18

Space Group:

P 43 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:ISOCITRATE DEHYDROGENASE
Gene (Uniprot):icd
Chain IDs:A
Chain Length:416
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P08200 Pfam ID:PF00180 EC:1.1.1.42

Primary Citation

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, Hurley, J.H, Dean, A.M, Thorsness, P.E, Koshlandjunior, D.E, Stroud, R.M, Hurley, J.H, Dean, A.M, Sohl, J.L, Koshlandjunior, D.E, Stroud, R.M.Show

Proc.Natl.Acad.Sci.USA 86 8635 8639 (1989)

PMID: 2682654 DOI: 10.1073/pnas.86.22.8635

Abstact

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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Primary Citation of related structures