BIOCHEM 523 Lecture Notes - Lecture 18: Reduction Potential, Cytochrome C1, Electron Transport Chain
1 Jan 2018
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Document Summary
The exceptions are coenzyme q, a lipid-soluble electron carrier that moves freely in the membrane, and cytochrome c, soluble protein electron carrier that is mobile within the intermembrane space. The respiratory chain catalyzes the transport of electrons from low-potential carriers to. Coenzyme q is not an enzyme, it is a highly lipophilic molecule high-potential carriers. Iron-sulfur proteins consist of nonheme iron complexed with the thiol sulfurs of cysteine. Another common form (fe4s4) contains a cluster of four irons, four sulfides tetrahedrally with four sulfur atoms from cysteine residues (inorganic sulfur) and four cysteine residues. The standard reduction potential of the iron in these iron-sulfur clusters varies dramatically depending on the type of cluster and the microenvironment provided by the protein to which it is attached. Complexes i, ii, iii all contain iron-sulfur clusters. Cytochromes: a group of red or brown heme proteins having distinctive visible-light spectra.
