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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The transmembrane domains of the nicotinic acetylcholine receptor contain alpha-helical and beta structures.

The transmembrane domain of the nicotinic acetylcholine receptor (nAChR) from Torpedo californica electric tissue contains both alpha-helical and beta structures. The secondary structure was investigated by Fourier transform infrared (FTIR) spectroscopy after the extramembrane moieties of the protein from the extracellular and intracellular sides of the membrane were removed by proteolysis using proteinase K. The secondary structure composition of this membrane structure was: alpha-helical 50%, beta structure and turns 40%, random 10%. The alpha-helices are shown to be oriented with respect to the membrane plane in a way allowing them to span the membrane, while no unidirectional structure for the beta structures was observed. These findings contradict previous secondary structure models based on hydropathy plots alone.[1]

References

  1. The transmembrane domains of the nicotinic acetylcholine receptor contain alpha-helical and beta structures. Görne-Tschelnokow, U., Strecker, A., Kaduk, C., Naumann, D., Hucho, F. EMBO J. (1994) [Pubmed]
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