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In this study we have used electrospray ionization mass spectrometry (ESI-MS) to investigate interactions between the bacterial K + channel KcsA and membrane phospholipids. KcsA was reconstituted into lipid vesicles of variable lipid composition. These vesicles were directly analyzed by ESI-MS or mixed with trifluoroethanol (TFE) before analysis. In the resulting mass spectra, non-covalent...
The molecular chaperone SecB is part of the protein translocation pathway in Escherichia coli. SecB was purified from an overproducing strain and crystallized, resulting in crystals diffracting to 2.3-Å resolution. The analysis of electrospray ionization mass spectra of dissolved crystals of SecB indicated that we have crystallized an acetylated form of SecB. Sequence analysis suggests that the protein...
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