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Science 318 (5856): 1608-1612

Copyright © 2007 by the American Association for the Advancement of Science

Structure of a Site-2 Protease Family Intramembrane Metalloprotease

Liang Feng,1* Hanchi Yan,1* Zhuoru Wu,1* Nieng Yan,1 Zhe Wang,2 Philip D. Jeffrey,1 Yigong Shi1{dagger}

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 ~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 {alpha}1 and {alpha}6 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.

1 Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, Princeton, NJ 08544, USA.
2 Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: ygshi{at}princeton.edu


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