Electron transport chain in the thylakoids: Lumen getting more or less acidic?

510586

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Hey guys I have a question. So I understand that during the electron transport chain, H+ are brought into the lumen from cytochrome and photolysis (more H+ in there so should be more acidic). However, ATP synthase is also pumping H+ out of the lumen into the stroma. If they ask what is getting acidic during the electron transport chain, how would we interpret this?
 
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enamel88

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More acidic in the lumen Bc it accumulates more than it can pump out. Just a side note remember that it pumps out 3H/Atp
 

orgoman22

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Hey guys I have a question. So I understand that during the electron transport chain, H+ are brought into the lumen from cytochrome and photolysis (more H+ in there so should be more acidic). However, ATP synthase is also pumping H+ out of the lumen into the stroma. If they ask what is getting acidic during the electron transport chain, how would we interpret this?
Hey guys I have a question. So I understand that during the electron transport chain, H+ are brought into the lumen from cytochrome and photolysis (more H+ in there so should be more acidic). However, ATP synthase is also pumping H+ out of the lumen into the stroma. If they ask what is getting acidic during the electron transport chain, how would we interpret this?
Wherever the H+ ions are pumped will be the area with the lowest pH and most acidic.

Hope this helps

Dr. Romano
 

orgoman22

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So in this case it would be the stroma?
The concentration of protons can be nearly 1000 x higher inside the thylakoids than in the stroma during light reactions. There are many articles on this that you can google if you want more info.

Dr. Romano
 

510586

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The concentration of protons can be nearly 1000 x higher inside the thylakoids than in the stroma during light reactions. There are many articles on this that you can google if you want more info.

Dr. Romano
Oh ok I thought you said wherever H+ is pumped to is most acidic. So it's actually where they are pumped FROM which is lumen that gets more acidic during ETC.
 
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