Complex III of Electron Transport Chain: Difference between revisions
From Proteopedia
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 18: | Line 18: | ||
The UQ<sup><big> • -</big></sup>, the <scene name='Complex_III_of_Electron_Transport_Chain/Focus_semiuq/1'>conjugate base</scene> of the semiquinone, which was formed at Qp as described above and is shown here as <font color=red>stigmatellin</font> is oxidized to the full UQ when it <scene name='Complex_III_of_Electron_Transport_Chain/Electron_semi_to_hem_l/2'>passes an electron</scene> to heme b<sub>L</sub>. The <scene name='Complex_III_of_Electron_Transport_Chain/Electron_hem_l_to_hem_h/1'>electron</scene> is then passed from the Fe of heme b<sub>L</sub> to the Fe of Heme b<sub>H</sub>, and with Heme b<sub>H</sub> being next to UQ bound at the Q<sub>n</sub> site (Binding site is shown <scene name='Complex_III_of_Electron_Transport_Chain/Hem_h_next_to_surface/2'>here</scene> as a surface.), the <scene name='Complex_III_of_Electron_Transport_Chain/Electron_hem_h_to_uq/2'>electron</scene> is passed to UQ. With only one electron being passed in this series of reaction the UQ is reduced to UQ<sup><big> • -</big></sup>, and becomes UQH<big><sup> •</sup></big> when it accepts a <scene name='Complex_III_of_Electron_Transport_Chain/Proton_matrix_in/1'>proton</scene> which comes from the matrix. The end products of the first half of the Q cycle are an ubiquinol oxidized to ubiquinone at the Q<sub>p</sub> site, a reduced cyt c and a ubiquinone reduced to semi-ubiquinone at the Q<sub>n</sub> site. | The UQ<sup><big> • -</big></sup>, the <scene name='Complex_III_of_Electron_Transport_Chain/Focus_semiuq/1'>conjugate base</scene> of the semiquinone, which was formed at Qp as described above and is shown here as <font color=red>stigmatellin</font> is oxidized to the full UQ when it <scene name='Complex_III_of_Electron_Transport_Chain/Electron_semi_to_hem_l/2'>passes an electron</scene> to heme b<sub>L</sub>. The <scene name='Complex_III_of_Electron_Transport_Chain/Electron_hem_l_to_hem_h/1'>electron</scene> is then passed from the Fe of heme b<sub>L</sub> to the Fe of Heme b<sub>H</sub>, and with Heme b<sub>H</sub> being next to UQ bound at the Q<sub>n</sub> site (Binding site is shown <scene name='Complex_III_of_Electron_Transport_Chain/Hem_h_next_to_surface/2'>here</scene> as a surface.), the <scene name='Complex_III_of_Electron_Transport_Chain/Electron_hem_h_to_uq/2'>electron</scene> is passed to UQ. With only one electron being passed in this series of reaction the UQ is reduced to UQ<sup><big> • -</big></sup>, and becomes UQH<big><sup> •</sup></big> when it accepts a <scene name='Complex_III_of_Electron_Transport_Chain/Proton_matrix_in/1'>proton</scene> which comes from the matrix. The end products of the first half of the Q cycle are an ubiquinol oxidized to ubiquinone at the Q<sub>p</sub> site, a reduced cyt c and a ubiquinone reduced to semi-ubiquinone at the Q<sub>n</sub> site. | ||
The second half of the Q cycle is the same as the first half except at the end a semi-ubiquinone is reduced to ubiquinol so that during a complete cycle ubiquinone is reduced to ubiqinol. | The second half of the Q cycle is the same as the first half except at the end a semi-ubiquinone is reduced to ubiquinol so that during a complete cycle at the Q<sub>n</sub> site ubiquinone is reduced to ubiqinol. | ||
==Footnotes== | ==Footnotes== | ||
<references/> | <references/> | ||
