| Structural highlights
Function
[FTSY_ECOLI] Involved in targeting and insertion of nascent membrane proteins into the cytoplasmic membrane. Acts as a receptor for the complex formed by the signal recognition particle (SRP) and the ribosome-nascent chain (RNC). Interaction with SRP-RNC leads to the transfer of the RNC complex to the Sec translocase for insertion into the membrane, the hydrolysis of GTP by both Ffh and FtsY, and the dissociation of the SRP-FtsY complex into the individual components.[1] [2] [3] [4] [5] [6]
Publication Abstract from PubMed
Co-translational protein targeting to the membrane is mediated by the signal recognition particle (SRP) and its receptor (FtsY). Their homologous GTPase domains interact at the membrane and form a heterodimer in which both GTPases are activated. The prerequisite for protein targeting is the interaction of FtsY with phospholipids. However, the mechanism of FtsY regulation by phospholipids remained unclear. Here we show that the N-terminus of FtsY (A domain) is natively unfolded in solution and define the complete membrane targeting sequence (MTS). We show that the MTS is highly dynamic in solution, independent of nucleotides and directly responds to the density of anionic phospholipids by a random coil-helix transition. This conformational switch is essential for tethering FtsY to membranes and activates the GTPase for its subsequent interaction with SRP. Our results underline the dynamics of lipid/protein interactions and their importance in the regulation of protein targeting and translocation across biological membranes.
Lipids trigger a conformational switch regulating signal recognition particle (SRP)-mediated protein targeting.,Stjepanovic G, Kapp K, Bange G, Graf C, Parlitz R, Wild K, Mayer MP, Sinning I J Biol Chem. 2011 May 3. PMID:21543314[7]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Luirink J, ten Hagen-Jongman CM, van der Weijden CC, Oudega B, High S, Dobberstein B, Kusters R. An alternative protein targeting pathway in Escherichia coli: studies on the role of FtsY. EMBO J. 1994 May 15;13(10):2289-96. PMID:8194520
- ↑ Powers T, Walter P. Co-translational protein targeting catalyzed by the Escherichia coli signal recognition particle and its receptor. EMBO J. 1997 Aug 15;16(16):4880-6. PMID:9305630 doi:10.1093/emboj/16.16.4880
- ↑ Peluso P, Shan SO, Nock S, Herschlag D, Walter P. Role of SRP RNA in the GTPase cycles of Ffh and FtsY. Biochemistry. 2001 Dec 18;40(50):15224-33. PMID:11735405
- ↑ Tian H, Beckwith J. Genetic screen yields mutations in genes encoding all known components of the Escherichia coli signal recognition particle pathway. J Bacteriol. 2002 Jan;184(1):111-8. PMID:11741850
- ↑ Buskiewicz I, Deuerling E, Gu SQ, Jockel J, Rodnina MV, Bukau B, Wintermeyer W. Trigger factor binds to ribosome-signal-recognition particle (SRP) complexes and is excluded by binding of the SRP receptor. Proc Natl Acad Sci U S A. 2004 May 25;101(21):7902-6. Epub 2004 May 17. PMID:15148364 doi:http://dx.doi.org/10.1073/pnas.0402231101
- ↑ Shan SO, Chandrasekar S, Walter P. Conformational changes in the GTPase modules of the signal reception particle and its receptor drive initiation of protein translocation. J Cell Biol. 2007 Aug 13;178(4):611-20. Epub 2007 Aug 6. PMID:17682051 doi:http://dx.doi.org/10.1083/jcb.200702018
- ↑ Stjepanovic G, Kapp K, Bange G, Graf C, Parlitz R, Wild K, Mayer MP, Sinning I. Lipids trigger a conformational switch regulating signal recognition particle (SRP)-mediated protein targeting. J Biol Chem. 2011 May 3. PMID:21543314 doi:10.1074/jbc.M110.212340
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