Abstract
The involvement of phosphatidylglycerol in the SecA-independent translocation of M13 procoat in Escherichia coli was demonstrated. Processing of procoat to mature coat protein was retarded when the level of phosphatidylglycerol was reduced. In vitro translocation experiments using inner membrane vesicles isolated from a strain with inducible synthesis of phosphatidylglycerol, showed that translocation of procoat and of a SecA- dependent procoat analog was proportional to the content of phosphatidylglycerol. Moreover, introduction of phosphatidylglycerol by means of a lipid transfer method into phosphatidylglycerol-depleted inner membrane vesicles, efficiently restored procoat translocation. The phosphatidylglycerol dependence in both the SecA-dependent and -independent translocation pathway indicates that phosphatidylglycerol plays a dual role in translocation. We suggest that besides membrane binding of SecA this lipid has a direct interaction with the M13 procoat in translocation across the inner membrane.
Original language | English |
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Pages (from-to) | 1560-1563 |
Number of pages | 4 |
Journal | Journal of Biological Chemistry |
Volume | 269 |
Issue number | 2 |
Publication status | Published - 14 Jan 1994 |
Keywords
- coat protein
- phosphatidylglycerol
- article
- cell membrane transport
- Escherichia coli
- membrane binding
- membrane vesicle
- nonhuman
- priority journal
- protein processing
- protein transport