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Crystal Structure of double mutant Y115E Y117E human Glutaminyl CyclaseCrystal Structure of double mutant Y115E Y117E human Glutaminyl Cyclase
Structural highlights
FunctionQPCT_HUMAN Responsible for the biosynthesis of pyroglutamyl peptides. Has a bias against acidic and tryptophan residues adjacent to the N-terminal glutaminyl residue and a lack of importance of chain length after the second residue. Also catalyzes N-terminal pyroglutamate formation. In vitro, catalyzes pyroglutamate formation of N-terminally truncated form of APP amyloid-beta peptides [Glu-3]-beta-amyloid. May be involved in the N-terminal pyroglutamate formation of several amyloid-related plaque-forming peptides.[1] [2] [3] Publication Abstract from PubMedRecent developments in molecular pathology and genetics have allowed the identification of human glutaminyl cyclase (hQC) among the abnormal proteins involved in many neurodegenerative disorders. Difficulties in obtaining large quantities of pure protein may limit the use of crystallographic screening for drug development on this target. Site-directed mutagenesis experiments have led to the identification of some solvent-exposed residues that are absolutely critical to achieve increased solubility and to avoid precipitation of the enzyme in inclusion bodies when expressed in Escherichia coli. The designed variant Y115E-Y117E has been found to be able to provide large amounts of monodisperse, pure hQC from an E. coli expression system. To validate the use of the artificial construct as a target for large-scale X-ray and NMR screening campaigns in the search for new inhibitors of hQC, the X-ray crystal structures of the hQC Y115E-Y117E variant and of its adduct with the inhibitor PBD-150 were determined. The soluble Y115E-Y117E variant of human glutaminyl cyclase is a valid target for X-ray and NMR screening of inhibitors against Alzheimer disease.,DiPisa F, Pozzi C, Benvenuti M, Andreini M, Marconi G, Mangani S Acta Crystallogr F Struct Biol Commun. 2015 Aug 1;71(Pt 8):986-92. doi:, 10.1107/S2053230X15010389. Epub 2015 Jul 28. PMID:26249687[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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