a
+ 0,5
0
- 0,5
-1
E
‘
o ( Volts )
P870
P870*
Bph
Q
pQ
bc 1
NAD
+
NADH, H
+
Reverse
electron
flow
H 2 S, S 2 O 3
2,
S o , etc.
C 2
E
‘
o ( Volts )
P840
P840*
pQ
bc 1
NAD
+
NADH, H
+
H 2 S, S 2 O 3
2,
S o , etc.,
BChl 663
Fe/S
Fd
c 555
b
P 870
2H
+
Photons
LH LH
LH LH
LH LH
LH LH
Q
C 2
RC
ee
-
Bph
Fe/S
bc 1
ADP+Pi
3H
+
Periplasmic
space
Cytoplasmic membrane
Cytoplasm
2H
+
c
pQ
ATP
Fig. 3.29 Photosynthetic system of anoxygenic phototrophic bacteria.
(a) Purple phototrophic bacteria. (b) Green sulfur phototrophic bacteria. (c) Membrane localization of the photosynthetic apparatus of
purple bacteria, proton transfer, and photophosphorylation. P840 and
P870 bacteriochlorophylls of reaction centers (RC), P870* and P840*
excited bacteriochlorophylls, Bph bacteriopheophytin, BChl 663
amended bacteriochlorophyll a, Q quinone, pQ quinone pool, Fe/S
iron–sulfur protein, Fd ferredoxin, bc1 complex of cytochromes b
and c1, c2 cytochrome c2, and c555 cytochrome c555. LH right
harvesting pigments. RC reaction center (Drawing: M.-J. Bodiou)
3 Structure and Functions of Microorganisms: Production and Use of Material and Energy
59