1kym | pdb_00001kym

Theoretical Model: The protein structure described on this page was determined Mechanosensitive channels: opening and closing, and hence should be interpreted with caution.

STRUCTURAL MODEL OF THE MECHANOSENSITIVE CHANNEL FROM ESCHERICHIA COLI: AN OPEN GATE STRUCTURE

spinqualitylabelsall models 1kym Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, PDBsum, ProSAT Publication Abstract from PubMed Mechanosensitive channels act as membrane-embedded mechano-electrical switches, opening a large water-filled pore in response to lipid bilayer deformations. This process is critical to the response of living organisms to direct physical stimulation, such as in touch, hearing and osmoregulation. Here, we have determined the structural rearrangements that underlie these events in the large prokaryotic mechanosensitive channel (MscL) using electron paramagnetic resonance spectroscopy and site-directed spin labelling. MscL was trapped in both the open and in an intermediate closed state by modulating bilayer morphology. Transition to the intermediate state is characterized by small movements in the first transmembrane helix (TM1). Subsequent transitions to the open state are accompanied by massive rearrangements in both TM1 and TM2, as shown by large increases in probe dynamics, solvent accessibility and the elimination of all intersubunit spin-spin interactions. The open state is highly dynamic, supporting a water-filled pore of at least 25 A, lined mostly by TM1. These structures suggest a plausible molecular mechanism of gating in mechanosensitive channels. Open channel structure of MscL and the gating mechanism of mechanosensitive channels.,Perozo E, Cortes DM, Sompornpisut P, Kloda A, Martinac B Nature. 2002 Aug 29;418(6901):942-8. PMID:12198539 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Mechanosensitive channels: opening and closing

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