Page 40 - Academic Press Encyclopedia of Physical Science and Technology 3rd InOrganic Chemistry
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P1: ZBU Final Pages
Encyclopedia of Physical Science and Technology EN002F-55 May 22, 2001 21:6
128 Bioinorganic Chemistry
FIGURE 7 Schematic of (a) spinach photosynthesis and (b) aerobic respiration emphasizing the chemical transfor-
mations and inorganic cofactors involved.
an Fe–S cluster and transfers the electrons to cytochrome Electron transfer from the matrix to the inner membrane
c. Cytochrome c transfers the electrons to cytochrome c space is coupled to proton transfer across the membrane.
oxidase. Here, the electrons are transferred to oxygen, re- However, the return oscillation is not, resulting in a pro-
ducing it to water (discussed below). ton gradient. The energy stored in this gradient is used
Complexes I–IV lie within the inner mitochondrial in ATP synthesis to phosphorylate ADP to form ATP, the
membrane. The proteins of each complex have structures transporter of energy in a cell.
that force the electron transfer pathway to oscillate from Enzymes that catalyze the reduction of oxygen to water
the mitochondrial matrix to the intermembrane space. are called oxidases:
