Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 33, Pages 13740-13745Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1108376108
Keywords
intramembrane proteolysis; signal sequence
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Funding
- National Bioresource Project E. coli for the Keio strains [JW0940, JW2203, JW2556]
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [20247020, 22770125, 22370070, 23657128, 19058007] Funding Source: KAKEN
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A signal peptide (SP) is cleaved off from presecretory proteins by signal peptidase during or immediately after insertion into the membrane. In metazoan cells, the cleaved SP then receives proteolysis by signal peptide peptidase, an intramembrane-cleaving protease (I-CLiP). However, bacteria lack any signal peptide peptidase member I-CLiP, and little is known about the metabolic fate of bacterial SPs. Here we show that Escherichia coli RseP, an site-2 protease (S2P) family I-CLiP, introduces a cleavage into SPs after their signal peptidase-mediated liberation from preproteins. A Bacillus subtilis S2P protease, RasP, is also shown to be involved in SP cleavage. These results uncover a physiological role of bacterial S2P proteases and update the basic knowledge about the fate of signal peptides in bacterial cells.
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