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3q2o is a 2 chain structure with sequence from Bacillus anthracis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
The apo structure of N5-carboxyaminoimidazole ribonucleotide synthase (PurK) from Bacillus anthracis (baPurK) with Mg2+ in the active site is reported at 1.96 A resolution. PurK is an enzyme in the purine-biosynthetic pathway, unique to prokaryotes, that converts 5-aminoimidazole ribonucleotide to N5-carboxyaminoimidazole ribonucleotide and has been suggested as a potential antimicrobial drug target. Two interesting features of baPurK are a flexible B-loop (residues 149/150-157) that is in close contact with the active site and the binding of Mg2+ to the active site without additional ligands.
Structure of N5-carboxyaminoimidazole ribonucleotide synthase (PurK) from Bacillus anthracis.,Tuntland ML, Johnson ME, Fung LW, Santarsiero BD Acta Crystallogr D Biol Crystallogr. 2011 Oct;67(Pt 10):870-4. Epub 2011, Sep 8. PMID:21931218[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑ Tuntland ML, Johnson ME, Fung LW, Santarsiero BD. Structure of N5-carboxyaminoimidazole ribonucleotide synthase (PurK) from Bacillus anthracis. Acta Crystallogr D Biol Crystallogr. 2011 Oct;67(Pt 10):870-4. Epub 2011, Sep 8. PMID:21931218 doi:10.1107/S0907444911029210
