2ch1
From Proteopedia
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STRUCTURE OF ANOPHELES GAMBIAE 3-HYDROXYKYNURENINE TRANSAMINASE
Overview
In Anopheles gambiae, the vector for the most deadly malaria parasite, Plasmodium falciparum, xanthurenic acid (XA) plays a key role in parasite, gametogenesis and fertility. In mosquitoes, XA is produced by, transamination of 3-hydroxykynurenine (3-HK), a reaction that represents, the main route to prevent the accumulation of the potentially toxic 3-HK, excess. Interfering with XA metabolism in A. gambiae therefore appears an, attractive avenue for the development of malaria transmission-blocking, drugs and insecticides. We have determined the crystal structure of A., gambiae 3-HK transaminase in its pyridoxal 5'-phosphate form and in, complex with a newly synthesized competitive enzyme inhibitor. Structural, inspection of the enzyme active site reveals the key molecular, determinants for ligand recognition and catalysis. Major contributions, toward inhibitor binding are provided by a salt bridge between the, inhibitor carboxylate and Arg-356 and by a remarkable hydrogen bond, network involving the anthranilic moiety of the inhibitor and backbone, atoms of residues Gly-25 and Asn-44. This study may be useful for the, structure-based design of specific enzyme inhibitors of potential interest, as antimalarial agents.
About this Structure
2CH1 is a Single protein structure of sequence from Anopheles gambiae with and as ligands. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Crystal structure of the Anopheles gambiae 3-hydroxykynurenine transaminase., Rossi F, Garavaglia S, Giovenzana GB, Arca B, Li J, Rizzi M, Proc Natl Acad Sci U S A. 2006 Apr 11;103(15):5711-6. Epub 2006 Apr 3. PMID:16585514
Page seeded by OCA on Sun Feb 3 10:35:12 2008
