Abstract
The crystal structure of the cytoplasmic domain (CTD) from the mechanosensitive channel of large conductance (MscL) in E. coli has been determined at 1.45 Å resolution. This domain forms a pentameric coiled coil similar to that observed in the structure of MscL from M. tuberculosis and also found in the cartilage oligomeric matrix protein (COMPcc). It contains canonical hydrophobic and atypical ionic interactions compared to previously characterized coiled coil structures. Thermodynamic analysis indicates that while the free EcMscL-CTD is less stable than other coiled coils, it is likely to remain folded in context of the full-length channel.
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