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    Alpha Helix Calculations in Bacteriorhodopsin

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    Under some environmental conditions the halophile Halobacterium halobium synthesizes a membrane protein (MW 26,000) bacteriorhodopsin, which is purple because it contains retinal. Molecules of this protein aggregate into purple
    patches in the cell membrane. Bacteriorhodopsin acts as a light activated proton
    pump that provides energy for cell functions. X-ray analysis of this protein
    reveals that it consists of seven parallel alpha-helical segments, each of which transverses the bacterial cell membrane (thickness 4.5 nm=45Å).
    a. Calculate the minimum number of amino acids necessary for one segment of alpha-helix to traverse the membrane completely
    b. Estimate the fraction of the bacteriorhodopsin protein that occurs in alpha-helical form.

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    https://brainmass.com/biology/cell-and-molecular-biology/alpha-helix-calculations-bacteriorhodopsin-159041

    Solution Preview

    Under some environmental conditions the halophile Halobacterium halobium
    synthesizes a membrane protein (MW 26,000) bacteriorhodopsin, which is purple because it contains retinal. Molecules of this protein aggregate into purple
    patches in the cell membrane. Bacteriorhodopsin acts as a light activated proton
    pump that provides ...

    Solution Summary

    Alpha Helix Calculations in Bacteriorhodopsin are explained in detail.

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