2c3p

CRYSTAL STRUCTURE OF THE FREE RADICAL INTERMEDIATE OF PYRUVATE:FERREDOXIN OXIDOREDUCTASE FROM Desulfovibrio africanusCRYSTAL STRUCTURE OF THE FREE RADICAL INTERMEDIATE OF PYRUVATE:FERREDOXIN OXIDOREDUCTASE FROM Desulfovibrio africanus

Structural highlights

2c3p is a 2 chain structure with sequence from Desulfocurvibacter africanus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.33Å
Ligands:	, , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PFOR_DESAF Catalyzes the ferredoxin-dependent oxidative decarboxylation of pyruvate. Required for the transfer of electrons from pyruvate to ferredoxin (PubMed:9294422, PubMed:7612653). Ferredoxin I and ferredoxin II, which are single 4Fe-4S cluster ferredoxins are the most effective electron carriers of POR (PubMed:7612653).^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Pyruvate-ferredoxin oxidoreductases (PFOR) are unique among thiamine pyrophosphate (ThDP)-containing enzymes in giving rise to a rather stable cofactor-based free-radical species upon the decarboxylation of their first substrate, pyruvate. We have obtained snapshots of unreacted and partially reacted (probably as a tetrahedral intermediate) pyruvate-PFOR complexes at different time intervals. We conclude that pyruvate decarboxylation involves very limited substrate-to-product movements but a significant displacement of the thiazolium moiety of ThDP. In this respect, PFOR seems to differ substantially from other ThDP-containing enzymes, such as transketolase and pyruvate decarboxylase. In addition, exposure of PFOR to oxygen in the presence of pyruvate results in significant inhibition of catalytic activity, both in solution and in the crystals. Examination of the crystal structure of inhibited PFOR suggests that the loss of activity results from oxime formation at the 4' amino substituent of the pyrimidine moiety of ThDP.

Flexibility of thiamine diphosphate revealed by kinetic crystallographic studies of the reaction of pyruvate-ferredoxin oxidoreductase with pyruvate.,Cavazza C, Contreras-Martel C, Pieulle L, Chabriere E, Hatchikian EC, Fontecilla-Camps JC Structure. 2006 Feb;14(2):217-24. PMID:16472741^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Pieulle L, Guigliarelli B, Asso M, Dole F, Bernadac A, Hatchikian EC. Isolation and characterization of the pyruvate-ferredoxin oxidoreductase from the sulfate-reducing bacterium Desulfovibrio africanus. Biochim Biophys Acta. 1995 Jul 3;1250(1):49-59. doi:, 10.1016/0167-4838(95)00029-t. PMID:7612653 doi:http://dx.doi.org/10.1016/0167-4838(95)00029-t
↑ Cavazza C, Contreras-Martel C, Pieulle L, Chabriere E, Hatchikian EC, Fontecilla-Camps JC. Flexibility of thiamine diphosphate revealed by kinetic crystallographic studies of the reaction of pyruvate-ferredoxin oxidoreductase with pyruvate. Structure. 2006 Feb;14(2):217-24. PMID:16472741 doi:10.1016/j.str.2005.10.013

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OCA

[1] Pieulle L, Guigliarelli B, Asso M, Dole F, Bernadac A, Hatchikian EC. Isolation and characterization of the pyruvate-ferredoxin oxidoreductase from the sulfate-reducing bacterium Desulfovibrio africanus. Biochim Biophys Acta. 1995 Jul 3;1250(1):49-59. doi:, 10.1016/0167-4838(95)00029-t. PMID:7612653 doi:http://dx.doi.org/10.1016/0167-4838(95)00029-t

[2] Cavazza C, Contreras-Martel C, Pieulle L, Chabriere E, Hatchikian EC, Fontecilla-Camps JC. Flexibility of thiamine diphosphate revealed by kinetic crystallographic studies of the reaction of pyruvate-ferredoxin oxidoreductase with pyruvate. Structure. 2006 Feb;14(2):217-24. PMID:16472741 doi:10.1016/j.str.2005.10.013

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