4MCR

A high resolution structure of human glutamate carboxypeptidase II (GCPII) in complex with folyltri-gamma-L-glutamic acid (pteroyltetra-gamma-L-glutamic acid)

4MCR の概要

• エントリーDOI: 10.2210/pdb4mcr/pdb
• 関連するPDBエントリー: 4MCP 4MCQ 4MCS
• 関連するBIRD辞書のPRD_ID: PRD_001163
• 分子名称: Glutamate carboxypeptidase 2, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (9 entities in total)
• 機能のキーワード: hydrolase, metallopeptidase, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cell membrane; Single-pass type II membrane protein. Isoform PSMA': Cytoplasm: Q04609
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 88693.51

構造登録者

Navratil, M.,Barinka, C.,Lubkowski, J. (登録日: 2013-08-21, 公開日: 2014-06-18, 最終更新日: 2024-11-20)

主引用文献

Navratil, M.,Ptacek, J.,Sacha, P.,Starkova, J.,Lubkowski, J.,Barinka, C.,Konvalinka, J.
Structural and biochemical characterization of the folyl-poly-gamma-l-glutamate hydrolyzing activity of human glutamate carboxypeptidase II.
Febs J., 281:3228-3242, 2014

PubMed Abstract: In addition to its well-characterized role in the central nervous system, human glutamate carboxypeptidase II (GCPII; Uniprot ID Q04609) acts as a folate hydrolase in the small intestine, participating in the absorption of dietary polyglutamylated folates (folyl-n-γ-l-glutamic acid), which are the provitamin form of folic acid (also known as vitamin B9 ). Despite the role of GCPII as a folate hydrolase, nothing is known about the processing of polyglutamylated folates by GCPII at the structural or enzymological level. Moreover, many epidemiologic studies on the relationship of the naturally occurring His475Tyr polymorphism to folic acid status suggest that this polymorphism may be associated with several pathologies linked to impaired folate metabolism. In the present study, we report: (a) a series X-ray structures of complexes between a catalytically inactive GCPII mutant (Glu424Ala) and a panel of naturally occurring polyglutamylated folates; (b) the X-ray structure of the His475Tyr variant at a resolution of 1.83 Å; (c) the study of the recently identified arene-binding site of GCPII through mutagenesis (Arg463Leu, Arg511Leu and Trp541Ala), inhibitor binding and enzyme kinetics with polyglutamylated folates as substrates; and (d) a comparison of the thermal stabilities and folate-hydrolyzing activities of GCPII wild-type and His475Tyr variants. As a result, the crystallographic data reveal considerable details about the binding mode of polyglutamylated folates to GCPII, especially the engagement of the arene binding site in recognizing the folic acid moiety. Additionally, the combined structural and kinetic data suggest that GCPII wild-type and His475Tyr variant are functionally identical.

PubMed: 24863754
DOI: 10.1111/febs.12857

実験手法

X-RAY DIFFRACTION (1.65 Å)