2on5
From Proteopedia
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Structure of NaGST-2
Overview
BACKGROUND: Human hookworm infection is a major cause of anemia and, malnutrition of adults and children in the developing world. As part of, on-going efforts to control hookworm infection, The Human Hookworm Vaccine, Initiative has identified candidate vaccine antigens from the infective L3, larval stages and adult stages of the parasite. Adult stage antigens, include the cytosolic glutathione-S-transferases (GSTs). Nematode GSTs, facilitate the inactivation and degradation of a variety of electrophilic, substrates (drugs) via the nucleophilic addition of reduced glutathione., Parasite GSTs also play significant roles in multi-drug resistance and the, modulation of host-immune defense mechanisms. RESULTS: The crystal, structures of Na-GST-1 and Na-GST-2, two major GSTs from Necator, americanus the main human hookworm parasite, have been solved at the, resolution limits of 2.4 A and 1.9 A respectively. The structure of, Na-GST-1 was refined to R-factor 18.9% (R-free 28.3%) while that of, Na-GST-2 was refined to R-factor 17.1% (R-free 21.7%). Glutathione usurped, during the fermentation process in bound in the glutathione binding site, (G-site) of each monomer of Na-GST-2. Na-GST-1 is uncomplexed and its, G-site is abrogated by Gln 50. These first structures of human hookworm, parasite GSTs could aid the design of novel hookworm drugs. CONCLUSION:, The 3-dimensional structures of Na-GST-1 and Na-GST-2 show two views of, human hookworm GSTs. While the GST-complex structure of Na-GST-2 reveals a, typical GST G-site that of Na-GST-1 suggests that there is some, conformational flexibility required in order to bind the substrate GST. In, addition, the overall binding cavities for both are larger, more open, as, well as more accessible to diverse ligands than those of GSTs from, organisms that have other major detoxifying mechanisms. The results from, this study could aid in the design of novel drugs and vaccine antigens.
About this Structure
2ON5 is a Protein complex structure of sequences from Necator americanus with and as ligands. Full crystallographic information is available from OCA.
Reference
X-ray structures of Na-GST-1 and Na-GST-2 two glutathione s-transferase from the human hookworm Necator americanus., Asojo OA, Homma K, Sedlacek M, Ngamelue M, Goud GN, Zhan B, Deumic V, Asojo O, Hotez PJ, BMC Struct Biol. 2007 Jun 26;7:42. PMID:17594497
Page seeded by OCA on Wed Jan 23 14:16:58 2008
