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Crystal Structure of Fully Ligated Adenylosuccinate Synthetase from Plasmodium falciparum

Eaazhisai, K and Jayalakshmi, R and Gayathri, P and Anand, RP and Sumathy, K and Balaram, H and Murthy, MRN (2004) Crystal Structure of Fully Ligated Adenylosuccinate Synthetase from Plasmodium falciparum. In: Journal of Molecular Biology, 335 (5). pp. 1251-1264.

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In the absence of the de novo purine nucleotide biosynthetic pathway in parasitic protozoa, purine salvage is of primary importance for parasite survival. Enzymes of the salvage pathway are, therefore, good targets for anti-parasitic drugs. Adenylosuccinate synthetase (AdSS), catalysing the first committed step in the synthesis of AMP from IMP, is a potential target for anti-protozoal chemotherapy. We report here the crystal structure of adenylosuccinate synthetase from the malaria parasite, Plasmodium falciparum, complexed to 6-phosphoryl IMP, GDP, $Mg^{2+}$ and the aspartate analogue, hadacidin at 2 $\AA$ resolution. The overall architecture of P. falciparum AdSS (PfAdSS) is similar to the known structures from Escherichia coli, mouse and plants. Differences in substrate interactions seen in this structure provide a plausible explanation for the kinetic differences between PfAdSS and the enzyme from other species.Additional hydrogen bonding interactions of the protein with GDP may account for the ordered binding of substrates to the enzyme. The dimer interface of PfAdSS is also different, with a pronounced excess of positively charged residues. Differences highlighted here provide a basis for the design of species-specific inhibitors of the enzyme.

Item Type: Journal Article
Additional Information: The copyright belongs to Elsevier science.
Keywords: Purine salvage pathway;Plasmodium falciparum;Adenylosuccinate synthetase;Hadacidin;Dimer interface
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Depositing User: Anka Setty
Date Deposited: 31 May 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ac.in/id/eprint/7152

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