3b4r

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spinqualitylabelsall models 3b4r, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Site-2 Protease from Methanocaldococcus jannaschii

Overview

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.

About this Structure

3B4R is a Single protein structure of sequence from Methanocaldococcus jannaschii with as ligand. Full crystallographic information is available from OCA.

Reference

Structure of a site-2 protease family intramembrane metalloprotease., Feng L, Yan H, Wu Z, Yan N, Wang Z, Jeffrey PD, Shi Y, Science. 2007 Dec 7;318(5856):1608-12. PMID:18063795

Page seeded by OCA on Wed Jan 23 11:11:04 2008