Abstract
Site-2 proteases (S2Ps) form a large family of membrane-embedded metalloproteases that participate in cellular signaling pathways through sequential cleavage of membrane-tethered substrates. Using sequence similarity searches, we extend the S2P family to include remote homologs that help define a conserved structural core consisting of three predicted transmembrane helices with traditional metalloprotease functional motifs and a previously unrecognized motif (GxxxN/S/G). S2P relatives were identified in genomes from Bacteria, Archaea, and Eukaryota including protists, plants, fungi, and animals. The diverse S2P homologs divide into several groups that differ in various inserted domains and transmembrane helices. Mammalian S2P proteases belong to the major ubiquitous group and contain a PDZ domain. Sequence and structural analysis of the PDZ domain support its mediating the sequential cleavage of membrane-tethered substrates. Finally, conserved genomic neighborhoods of S2P homologs allow functional predictions for PDZ-containing transmembrane proteases in extracytoplasmic stress response and lipid metabolism. Published by Cold Spring Harbor Laboratory Press.
Original language | English (US) |
---|---|
Pages (from-to) | 84-93 |
Number of pages | 10 |
Journal | Protein Science |
Volume | 15 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2006 |
Keywords
- Domain organization
- Functional prediction
- Motif recognition
- Phylogenetic analysis
- Regulated intramembrane proteolysis
- Site-2 protease
ASJC Scopus subject areas
- Biochemistry
- Molecular Biology