[ppt]presentación de powerpoint - bioquímica grupo 4 fq … · web viewtitle presentación de...
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6H2O + 6CO2 ----------> C6H12O6+ 6O2
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10% fosfolípidos80% mono- o digalactosil Diacilgliceroles10% sulfoquinovosil diacilglicerolAlta insaturación: fluidez
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Reacciones luminosas: NADPH y ATPTilacoide
Reacciones obscuras:Independientes de la luz:Síntesis CHOestroma
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Fotoreceptor:tetrapirrol cíclico
Mg2+ Altamente comjugada: absorbe Luz visible
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Disipación energía molécula excitada:Transferencia de energía de resonancia (exciton transfer
Fotooxidación: molécula excitada c/ Luz se oxida y dona electrón a un aceptor (se reduce)
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Transferencia de energía de resonancia
Fotooxidación
Clorofilas Antenas:Complejos Cosechadores de luzPigmentos accesorios
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Diagrama Z: fotosíntesis que genera O2 : 2 centros de reacción en serie
2NADP+ + 2H2O 2NADPH + O2 + 2 H+
Cytb6f
mov
mov
P680
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OEC:Oxygen evolving complexFotólisis del agua
DCMU
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Estroma
Lumen tilacoidal
H+
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Lumen tilacoidal
H+
Ferredoxina Soluble reducida
2NADP++ 2H+
2NADPH
Fd-NADP+ reductasa
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CF0CF1
CF0
CF1
8
4
NC:1 ATP / 3 H+ = 4 ATP / O2
NADPH: 3 ATP= 6ATP
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fosforibulocinasa
Ribulosa bifosfatocarboxilasa
fosfogliceratocinasa
gliceraldh3P DH
aldolasa
Fosfopentosa isomerasa
transcetolasa
aldolasa
transcetolasa
ribosaP isomerasa Fosfopentosa
isomerasa
C3 + C3 C6 C3 + C6 C5 + C4 C3 + C4 C7 C3 + C7 C5 + C5
Overall: 5C3 3C5
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fosforibulocinasa
Ribulosa bifosfatocarboxilasa
fosfogliceratocinasa
gliceraldh3P DH
aldolasa
Fosfopentosa isomerasa
transcetolasa
aldolasa
transcetolasa
ribosaP isomerasa Fosfopentosa
isomerasa
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Ribulosa bifosfato
carboxilasa
G0’= -35.1 kJ mol-1
G0’= +18 kJ mol-1 Fru6P: Glu1P: sacarosa,Almidón, celulosa ac. Grasos, aa
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Regulación : obscuridad: consumo NADPH y ATP de fase luminosa
Ribulosa bifosfato carboxilasa:
Actividad varía con pH: ilumunación
Estimulada por Mg2+
Estimulada alostéricamente por NADPH
Inh. Por 2-carboxiarabinitol (oscuridad)
Fructosa bifosfatasa y sedoheptulosa bifosfatasa idem
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PSIred
PSI*red PSI ox
Fdox Fdred
Fd-tiored Fd-tioredReductasa red reductasa ox
Trx ox Trx redS-S SH SH
Bifosfatasa activa Bifosfatasa inactivaSH SH S-S
+Calvin
PFK actS-S
PFK inactSH SH
-Glucólisis
Trx
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C3 + C3 C6 C3 + C6 C5 + C4 C3 + C4 C7 C3 + C7 C5 + C5
Overall: 5C3 3C5
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A
BC
Ener
gía
Libr
e
O2 + 4H+
H2O D
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A
B
DEn
ergí
a Li
bre
e-
C
H+