Myoglobin: Difference between revisions
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The globin consists mostly of [[Helices in Proteins|alpha helices]] shown in <scene name='23/238129/2ndary_structure/2'>pink</scene>; it has no beta sheets and its nonhelical segments mostly serve as links that connect the helices. Look down the barrel of some of the longer helices. Are they all straight? The eight structurally conserved alpha helices are labelled <scene name='23/238129/Helix_labels/1'>A through H</scene>. The protein is colored as a N-->C rainbow in this view; the N terminus is blue, while the C terminus is red. | The globin consists mostly of [[Helices in Proteins|alpha helices]] shown in <scene name='23/238129/2ndary_structure/2'>pink</scene>; it has no beta sheets and its nonhelical segments mostly serve as links that connect the helices. Look down the barrel of some of the longer helices. Are they all straight? The eight structurally conserved alpha helices are labelled <scene name='23/238129/Helix_labels/1'>A through H</scene>. The protein is colored as a N-->C rainbow in this view; the N terminus is blue, while the C terminus is red. | ||
The heme is shown in spacefilling form with its N, O, and Fe atoms displayed as blue, red, and orange balls. Note how the heme is almost completely enclosed by the globin. Which few chemical groups of the Heme are exposed to the solvent? (holding the mouse over the atoms reveals their identity.) Can you rationalize this exposure? | The heme ligand is what binds the oxygen is shown in spacefilling form with its N, O, and Fe atoms displayed as blue, red, and orange balls. Note how the heme is almost completely enclosed by the globin. Which few chemical groups of the Heme are exposed to the solvent? (holding the mouse over the atoms reveals their identity.) Can you rationalize this exposure? | ||
The overall <scene name='23/238129/Surface/1'>shape</scene> of myoglobin is approximately disc-shaped with a diameter that is about twice its thickness. | The overall <scene name='23/238129/Surface/1'>shape</scene> of myoglobin is approximately disc-shaped with a diameter that is about twice its thickness. | ||