3B4R

Site-2 Protease from Methanocaldococcus jannaschii

Summary for 3B4R

• Entry DOI: 10.2210/pdb3b4r/pdb
• Descriptor: Putative zinc metalloprotease MJ0392, ZINC ION (2 entities in total)
• Functional Keywords: intramembrane protease, metalloprotease, cbs domain, hydrolase, metal-binding, transmembrane, zinc
• Biological source: Methanocaldococcus jannaschii
• Cellular location: Cell membrane; Multi-pass membrane protein (Potential): Q57837
• Total number of polymer chains: 2
• Total formula weight: 50019.55

Authors

Jeffrey, P.D.,Feng, L.,Yan, H.,Wu, Z.,Yan, N.,Wang, Z.,Shi, Y. (deposition date: 2007-10-24, release date: 2008-01-15, Last modification date: 2024-02-21)

Primary citation

Feng, L.,Yan, H.,Wu, Z.,Yan, N.,Wang, Z.,Jeffrey, P.D.,Shi, Y.
Structure of a site-2 protease family intramembrane metalloprotease.
Science, 318:1608-1612, 2007

PubMed Abstract: Regulated intramembrane proteolysis by members of the site-2 protease (S2P) family is an important signaling mechanism conserved from bacteria to humans. Here we report the crystal structure of the transmembrane core domain of an S2P metalloprotease from Methanocaldococcus jannaschii. The protease consists of six transmembrane segments, with the catalytic zinc atom coordinated by two histidine residues and one aspartate residue approximately 14 angstroms into the lipid membrane surface. The protease exhibits two distinct conformations in the crystals. In the closed conformation, the active site is surrounded by transmembrane helices and is impermeable to substrate peptide; water molecules gain access to zinc through a polar, central channel that opens to the cytosolic side. In the open conformation, transmembrane helices alpha1 and alpha6 separate from each other by 10 to 12 angstroms, exposing the active site to substrate entry. The structure reveals how zinc embedded in an integral membrane protein can catalyze peptide cleavage.

PubMed: 18063795
DOI: 10.1126/science.1150755

Experimental method

X-RAY DIFFRACTION (3.3 Å)