21Electrontransport

d777 l h k6 antiport malate

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Unformatted text preview: 0%3)_+&&0#&[) ) ) *&+(,-'&%) Not really permeable *3-#,)'4)*&+(,-'&%! G'(1#20+%#2)*&+(,-'&%);.&++4>&$*?! /1FG!F1G!HF1! L#20+%#2)*&+(,-'&%)) N+,,0O#?1#20+%#2)*&+(,-'&%) ;+(8&5&)()#'!'&++4>&$*?! H$%0O#)*&+(,-'&%) J+$0"0%+%#2)R3)N&'%#0(,Q) .+&&0#&,T)*&+(,-'&%#&,T) *&+(,"'$+,#,T)'&)N#&1#+,#,U) K%'0$/0'1#%&3)'4)L#20+%#2)*&+(,-'&%) Energy associated with transport of A c oupled with B faciliates B's transport L0%'$/'(2&0+) ,$!,-./!D7(*>:$7)#7! L+"+%# H,-+&%+%#)K/6%%"#) Antiport-malate in and aketoglutarate out Aspartate out and glutamate in L+"+%# H,-+&%+%#)K/6%%"#) Net reaction is the net transport of NADH to NAD+ in the cytosol. We're not physically shuttling NADH though. We're physically s huttling malate and aspartate 5"3$#&'-/',-/+%#)K/6%%"#) NADH in cytosol --> FADH2 in matrix. We're losing ATP in this s huttle because NADH y ields more than FADH2. FASTER but LESS EFFICIENT *&+(,-'&%)'4)HINT)H*NT)+(2) Y('&P+(0$)N/',-/+%#)ZN0[) HIN?H*N)*&+(,"'$+%'&) -.@I-D@!J%8B(*A#7! N/',-/+%#)*&+(,-'&%) ! N/',-/+%#)*&+(,-'&%#&) Driven by the proton gradient =9Z'6%[) =9Z0([) =;N7E Z'6%[) =;N7E Z0([) !"#$%&'()*&+(,-'&%) !"#$%&'()*&+(,-'&%)0,)+() !8#&P'(0$)N&'$#,,) K%+(2+&2)D#26$%0'()N'%#(%0+",) K%+(2+&2)D#26$%0'()N'%#(%0+") I044#&#($#) $ !K!J$ ;# !(88#:)$7?! !J$ ;# !'$*$7?! ' )>) ' ! n = # eF = Faraday's constant 0$7!*#A()&E#! L!*##'!:$>&)&E#! J! J;(88#:)$7?!M!J;'$*$7?! ! ! ,$)#N!7#'48)&$*!:$)#*)&(5!&>!#%)7#9#5=!:/!>#*>&)&E#! J!K!J !O!PQPRST;U6:/?! `/+%)0,)%/#) $ (*'! ' 4'&)%/#)) 7802+%0'()'4)GHI=)R3)7;a!)) -----> The number of e- does not c hange the reduction potential. For example, for the reduction of O 2, if we had : 1O2 + 4H+ + 4e- ---> 2H...
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