3I4X: Crystal Structure Of The Dimethylallyl Tryptophan Synthase Fgapt2 From Aspergillus Fumigatus In Complex With Trp And Dmspp

Ergot 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 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).
PDB ID: 3I4XDownload
MMDB ID: 76478
PDB Deposition Date: 2009/7/3
Updated in MMDB: 2012/10
Experimental Method:
x-ray diffraction
Resolution: 2.1  Å
Source Organism:
Similar Structures:
Biological Unit for 3I4X: dimeric; determined by author
Molecular Components in 3I4X
Label Count Molecule
Proteins (2 molecules)
Tryptophan Dimethylallyltransferase(Gene symbol: AFUA_2G18040)
Molecule annotation
Chemicals (6 molecules)
* Click molecule labels to explore molecular sequence information.

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