3i4x
From Proteopedia
Crystal structure of the dimethylallyl tryptophan synthase FgaPT2 from Aspergillus fumigatus in complex with Trp and DMSPP
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedErgot alkaloids are toxins and important pharmaceuticals that are produced biotechnologically on an industrial scale. The first committed step of ergot alkaloid biosynthesis is catalyzed by dimethylallyl tryptophan synthase (DMATS; EC 2.5.1.34). Orthologs of DMATS are found in many fungal genomes. We report here the x-ray structure of DMATS, determined at a resolution of 1.76 A. A complex of DMATS from Aspergillus fumigatus with its aromatic substrate L-tryptophan and with an analogue of its isoprenoid substrate dimethylallyl diphosphate reveals the structural basis of this enzyme-catalyzed Friedel-Crafts reaction, which shows strict regiospecificity for position 4 of the indole nucleus of tryptophan as well as unusual independence of the presence of Mg(2+) ions. The 3D structure of DMATS belongs to a rare beta/alpha barrel fold, called prenyltransferase barrel, that was recently discovered in a small group of bacterial enzymes with no sequence similarity to DMATS. These bacterial enzymes catalyze the prenylation of aromatic substrates in the biosynthesis of secondary metabolites (i.e., a reaction similar to that of DMATS). The structure of dimethylallyl tryptophan synthase reveals a common architecture of aromatic prenyltransferases in fungi and bacteria.,Metzger U, Schall C, Zocher G, Unsold I, Stec E, Li SM, Heide L, Stehle T Proc Natl Acad Sci U S A. 2009 Aug 25;106(34):14309-14. Epub 2009 Aug 12. PMID:19706516[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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