4AL1 image
Entry Detail
PDB ID:
4AL1
Keywords:
Title:
Crystal structure of Human PS-1 GSH-analog complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-02-29
Release Date:
2013-02-06
Method Details:
Experimental Method:
Resolution:
1.95 Å
R-Value Free:
0.17
R-Value Work:
0.17
R-Value Observed:
0.16
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PROSTAGLANDIN E SYNTHASE
Chain IDs:A
Chain Length:152
Number of Molecules:1
Biological Source:HOMO SAPIENS
Primary Citation
Crystal Structure of Microsomal Prostaglandin E2 Synthase Provides Insight Into Diversity in the Mapeg Superfamily.
Proc.Natl.Acad.Sci.USA 110 3806 ? (2013)
PMID: 23431194 DOI: 10.1073/PNAS.1218504110

Abstact

Prostaglandin E2 (PGE2) is a key mediator in inflammatory response. The main source of inducible PGE2, microsomal PGE2 synthase-1 (mPGES-1), has emerged as an interesting drug target for treatment of pain. To support inhibitor design, we have determined the crystal structure of human mPGES-1 to 1.2 Å resolution. The structure reveals three well-defined active site cavities within the membrane-spanning region in each monomer interface of the trimeric structure. An important determinant of the active site cavity is a small cytosolic domain inserted between transmembrane helices I and II. This extra domain is not observed in other structures of proteins within the MAPEG (Membrane-Associated Proteins involved in Eicosanoid and Glutathione metabolism) superfamily but is likely to be present also in microsomal GST-1 based on sequence similarity. An unexpected feature of the structure is a 16-Å-deep cone-shaped cavity extending from the cytosolic side into the membrane-spanning region. We suggest a potential role for this cavity in substrate access. Based on the structure of the active site, we propose a catalytic mechanism in which serine 127 plays a key role. We have also determined the structure of mPGES-1 in complex with a glutathione-based analog, providing insight into mPGES-1 flexibility and potential for structure-based drug design.

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