Journal
SCIENCE
Volume 328, Issue 5986, Pages 1698-1700Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1188950
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Funding
- European Research Council [ERC-2008-AdG 232648]
- Swedish Cancer Foundation
- Swedish Research Council
- Swedish Foundation for Strategic Research
- International Human Frontier Science Program Organization
- European Communities [TranSys PITN-2008-215524]
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The mechanism by which multispanning helix-bundle membrane proteins are inserted into their target membrane remains unclear. In both prokaryotic and eukaryotic cells, membrane proteins are inserted cotranslationally into the lipid bilayer. Positively charged residues flanking the transmembrane helices are important topological determinants, but it is not known whether they act strictly locally, affecting only the nearest transmembrane helices, or can act globally, affecting the topology of the entire protein. Here we found that the topology of an Escherichia coli inner membrane protein with four or five transmembrane helices could be controlled by a single positively charged residue placed in different locations throughout the protein, including the very C terminus. This observation points to an unanticipated plasticity in membrane protein insertion mechanisms.
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