ISDA

Entry Detail

PDB ID:

1AA6

Keywords:

OXIDOREDUCTASE

Title:

REDUCED FORM OF FORMATE DEHYDROGENASE H FROM E. COLI

Biological Source:

Source Organism:

Escherichia coli

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

1997-01-23

Release Date:

1997-08-20

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.30 Å

R-Value Free:

0.28

R-Value Work:

0.21

R-Value Observed:

0.21

Space Group:

P 41 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:FORMATE DEHYDROGENASE H
Chain IDs:A
Chain Length:715
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P07658 Pfam ID:PF04879, PF00384, PF01568 EC:1.17.1.9

Ligand Molecules

4MO

MGD

SF4

Primary Citation

Crystal structure of formate dehydrogenase H: catalysis involving Mo, molybdopterin, selenocysteine, and an Fe4S4 cluster.

Boyington, J.C, Gladyshev, V.N, Khangulov, S.V, Stadtman, T.C, Sun, P.D, Gladyshev, V.N, Boyington, J.C, Khangulov, S.V, Grahame, D.A, Stadtman, T.C, Sun, P.D.Show

Science 275 1305 1308 (1997)

PMID: 9036855 DOI: 10.1126/science.275.5304.1305

Abstact

Formate dehydrogenase H from Escherichia coli contains selenocysteine (SeCys), molybdenum, two molybdopterin guanine dinucleotide (MGD) cofactors, and an Fe4S4 cluster at the active site and catalyzes the two-electron oxidation of formate to carbon dioxide. The crystal structures of the oxidized [Mo(VI), Fe4S4(ox)] form of formate dehydrogenase H (with and without bound inhibitor) and the reduced [Mo(IV), Fe4S4(red)] form have been determined, revealing a four-domain alphabeta structure with the molybdenum directly coordinated to selenium and both MGD cofactors. These structures suggest a reaction mechanism that directly involves SeCys140 and His141 in proton abstraction and the molybdenum, molybdopterin, Lys44, and the Fe4S4 cluster in electron transfer.

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Primary Citation of related structures