2O2S

The structure of T. gondii enoyl acyl carrier protein reductase in complex with NAD and triclosan

Summary for 2O2S

• Entry DOI: 10.2210/pdb2o2s/pdb
• Related: 1D7O 1D8A 1JVF 1NHG 2O2Y 2O50
• Descriptor: Enoyl-acyl carrier reductase, NICOTINAMIDE-ADENINE-DINUCLEOTIDE, TRICLOSAN, ... (4 entities in total)
• Functional Keywords: enoyl reductase, triclosan, rossmann fold, oxidoreductase
• Biological source: Toxoplasma gondii
• Total number of polymer chains: 2
• Total formula weight: 68689.04

Authors

Muench, S.P.,Prigge, S.T.,McLeod, R.,Rafferty, J.B.,Kirisits, M.J.,Roberts, C.W.,Mui, E.J.,Rice, D.W. (deposition date: 2006-11-30, release date: 2006-12-26, Last modification date: 2023-10-25)

Primary citation

Muench, S.P.,Prigge, S.T.,McLeod, R.,Rafferty, J.B.,Kirisits, M.J.,Roberts, C.W.,Mui, E.J.,Rice, D.W.
Studies of Toxoplasma gondii and Plasmodium falciparum enoyl acyl carrier protein reductase and implications for the development of antiparasitic agents
ACTA CRYSTALLOGR.,SECT.D, 63:328-338, 2007

PubMed Abstract: Recent studies have demonstrated that submicromolar concentrations of the biocide triclosan arrest the growth of the apicomplexan parasites Plasmodium falciparum and Toxoplasma gondii and inhibit the activity of the apicomplexan enoyl acyl carrier protein reductase (ENR). The crystal structures of T. gondii and P. falciparum ENR in complex with NAD(+) and triclosan and of T. gondii ENR in an apo form have been solved to 2.6, 2.2 and 2.8 A, respectively. The structures of T. gondii ENR have revealed that, as in its bacterial and plant homologues, a loop region which flanks the active site becomes ordered upon inhibitor binding, resulting in the slow tight binding of triclosan. In addition, the T. gondii ENR-triclosan complex reveals the folding of a hydrophilic insert common to the apicomplexan family that flanks the substrate-binding domain and is disordered in all other reported apicomplexan ENR structures. Structural comparison of the apicomplexan ENR structures with their bacterial and plant counterparts has revealed that although the active sites of the parasite enzymes are broadly similar to those of their bacterial counterparts, there are a number of important differences within the drug-binding pocket that reduce the packing interactions formed with several inhibitors in the apicomplexan ENR enzymes. Together with other significant structural differences, this provides a possible explanation of the lower affinity of the parasite ENR enzyme family for aminopyridine-based inhibitors, suggesting that an effective antiparasitic agent may well be distinct from equivalent antimicrobials.

PubMed: 17327670
DOI: 10.1107/S0907444906053625

Experimental method

X-RAY DIFFRACTION (2.6 Å)