Explanation of terms of electron transfer chain

? Electron transfer chain generally refers to respiratory chain, which is a continuous reaction system consisting of a series of hydrogen transfer reactions and electron transfer reactions arranged in a certain order. It removes paired hydrogen atoms from metabolites to generate oxygen and water, and at the same time, ATP is generated.

Electron transfer chain, etc.) is an electron transfer system composed of a series of electron carriers in the order of increasing electron affinity.

Electron transporter:

1, nicotinamide nucleotide (NAD+) A variety of substrate dehydrogenases take NAD+ as a coenzyme and accept hydrogen removed from the substrate to become reduced NADH++H+, which is a hydrogen (H+ and eˉ) transporter.

2. flavoprotein yellow protein takes FAD and FMN as auxiliary groups, accepts protons and electrons from NADH ++ H+ or substrate (such as succinic acid), forms FADH 2 or FMNH 2, and transmits protons and electrons.

3. Iron-sulfur protein or iron-sulfur center? Also known as non-heme protein, it is a single electron transporter, and its oxidation state is Fe3 ++ and its reduction state is Fe 2+.

4. Coenzyme Q, also known as ubiquinone, is a fat-soluble compound. It can not only accept hydrogen from dehydrogenase, but also hydrogen from succinate dehydrogenase (H++E ˉ). It is the hydrogen carrier in the center of electron transfer chain.

5. cytochrome? It is an iron-containing single electron transfer carrier. The iron atom is in the center of porphyrin, which constitutes heme. It is an auxiliary group of cytochrome. Cytochrome is a specialized enzyme that transfers electrons from coenzyme Q to oxygen in the respiratory chain.