Bis2A 5.5: Fermentation and regeneration of NAD+

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1 OpenStax-CNX module: m Bis2A 5.5: Fermentation and regeneration of NAD+ The BIS2A Team This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 4.0 Abstract This module will discuss the process of fermentation and the purpose of fermentation. Section Summary This section discusses the process of fermentation. Due to the heavy emphasis in this course on central carbon metabolism the discussion of fermentation understandably focuses on the fermentation of pyruvate. Nevertheless, some of the core the principles that we cover in this section apply equally well to the fermentation of many other small molecules. The Purpose of Fermentation The oxidation of a variety of small organic compounds is a process that is utilized by many organisms to garner energy for cellular maintenance and growth. The oxidation of glucose via glycolysis is one such pathway. Several key steps in the oxidation of glucose to pyruvate involve the reduction of the electron/energy shuttle NAD + to NADH. At the end of section 5.3 you were posed with the challenge of trying to gure out what options the cell might reasonably have to re-oxidize the NADH to NAD + in order to avoid consuming the available pools of NAD + and thus stopping glycolysis. Put dierently, during glycolysis cells can generate large amounts of NADH and slowly exhaust their supplies of NAD +. If glycolysis is to continue, the cell must nd a way to regenerate NAD +, either by synthesis or by some form of recycling. In the absence of any other process - that is, if we consider glycolysis alone - it is not immediately obvious what the cell might do. One choice is to try putting the electrons that were once stripped o of the glucose derivatives right back onto the downstream product, pyruvate or one of its derivatives. We can generalize the process by describing it as the returning of electrons to the molecule that they were once removed from, usually to restore pools of a oxidizing agent. This, in short, is fermentation. As we will discuss in a dierent section, the process of respiration can also regenerate the pools of NAD + from NADH. Cells lacking respiratory chains or in conditions where using the respiratory chain is unfavorable may choose fermentation as an alternative mechanism for garnering energy from small molecules. Helpful Videos Here is a chemwiki link on fermentation reactions 1. Version 1.1: Jan 21, :55 pm

2 OpenStax-CNX module: m An Example: Lactic Acid Fermentation An everyday example of a fermentation reaction is the reduction of pyruvate to lactate by the lactic acid fermentation reaction. This reaction should be familiar to you, it occurs in our muscles when we exert ourselves during exercise. When we exert ourselves our muscles require large amounts of ATP to perform the work we are demanding of them. As the ATP is consumed, the muscle cells are unable to keep up with the demand for respiration, O 2 becomes limiting and NADH accumulates. Cells need to get rid of the excess and regenerate NAD +, so pyruvate serves as an electron acceptor, generating lactate and reducing NADH to NAD +. Many bacteria use this pathway as a way to complete the NADH/NAD + cycle. You may be familiar with this process from in products like sauerkraut and yogurt. The chemical reaction of lactic acid fermentation is the following: Pyruvic acid + NADH lactic acid + NAD + (1) note: Figure 1: Lactic acid fermentation converts pyruvate (a slightly oxidized carbon compound) to lactic acid. In the process, NADH is oxidized to form NAD +. Source: modications of

3 OpenStax-CNX module: m Energy Story for Fermentation of Pyruvate to Lactate An example (if a bit lengthy) energy story for lactic acid fermentation: The reactants are pyruvate, NADH and a proton. The products are lactate and NAD +. The process of fermentation results in the reduction of pyruvate to form lactic acid and the oxidation of NADH to form NAD +. Electrons from NADH and a proton are used to reduce pyruvate into lactate. If we examine a table of standard reduction potential we see under standard conditions that a transfer of electrons from NADH to pyruvate to form lactate is exergonic and thus thermodynamically spontaneous. The reduction and oxidation steps of the reaction are coupled and catalyzed by the enzyme lactate dehydrogenase. 2 A second example: Alcohol Fermentation Another familiar fermentation process is alcohol fermentation, which produces ethanol, an alcohol. alcohol fermentation reaction is the following: The Figure 2: Ethanol fermentation is a two step process. Pyruvate (pyruvic acid) is rst converted into carbon dioxide and acetaldehyde. The second step, converts acetaldehyde to ethanol and oxidizes NADH to NAD +. In the rst reaction, a carboxyl group is removed from pyruvic acid, releasing carbon dioxide as a gas (some of you may be familiar with this as a key component of various beverages). The second reaction removes electrons from NADH, forming NAD + and producing ethanol (another familiar compound - usually in the same beverage) from the acetaldehyde, which accepts the electrons. note: Write a complete energy story for alcohol fermentation. Propose possible benets of this type of fermentation for the single celled yeast organism. 3 Fermentation pathways are numerous While the lactic acid fermentation and alcohol fermentation pathways described above are examples, there are many more reactions (too numerous to go over) that Nature has evolved to complete the NADH/NAD + cycle. It is important that you understand the general concepts behind these reactions. In general, cells try to maintain a balance or constant ratio between NADH and NAD + ; when this ratio becomes unbalanced,

4 OpenStax-CNX module: m the cell compensates by modulating other reactions to compensate. The only requirement for a fermentation reaction is that it uses a small organic compound as an electron acceptor for NADH and regenerates NAD +. Other familiar fermentation reactions include, ethanol fermentation (as in beer and bread) and propionic fermentation (it's what makes the holes in swiss cheese) and malolactic fermentation (it's what gives chardonnay is more mellow avor, more conversion of malate to lactate the softer the wine). In Figure 3 below you can see a large variety of fermentation reactions that various bacteria use to reoxidize NADH to NAD +. All of these reactions start with pyruvate or a derivative of pyruvate matabolism, such as oxaloacetate, or formate. Pyruvate is produced from the oxidation of sugars (glucose or ribose) or other small reduced organic molecules. It should also be noted that other compounds can be used as fermentation substrates besides pyruvate and its derivatives. These include: methane fermentation, sulde fermentation, or the fermentation of nitrogenous compounds such as amino acids. You are not expected to memorize all of these pathways. You are, however, expected to recognize a pathway that returns electrons to products of the compounds that were originally oxidized to recycle the NAD + /NADH pool and to associate that process with fermentation. Figure 3: Various fermentation pathways using pyruvate as the initial substrate. In the gure, glucose is oxidized to pyruvate and pyruvate is the starting material (substrate) for a variety of dierent fermentation reactions. A note on the link between substrate level phosphorylation and fermentation Fermentation occurs in the absence of molecular oxygen (O 2 ). It is an anaerobic process. Notice there is no O 2 in any of the fermentation reactions shown above. Many of these reactions are quite ancient, hypothesized to be some of the rst energy generating metabolic reactions to evolve. This makes sense if we consider the following: 1. The early atmosphere was highly reduced, with little molecular oxygen readily available.

5 OpenStax-CNX module: m Small, highly reduced organic molecules were relatively available, arising from a variety of chemical reactions. 3. These types of reactions, pathways and enzymes are found in many dierent types of organisms, including bacteria, archaea and eukaryotes, suggesting these are very ancient reactions. 4. The process evolved long before O 2 was found in the environment. 5. The substrates, highly reduced small organic molecules, like glucose, were readily available. 6. The end products of many fermentation reactions are small organic acids, produced by the oxidation of the initial substrate. 7. The process is coupled to substrate level phosphorylation reactions. That is, small reduced organic molecules are oxidized and ATP is generated by rst a red/ox reaction followed by the substrate level phosphorylation. 8. This suggests that substrate level phosphorylation and fermentation reactions co-evolved. note: If the hypothesis is correct, that substrate level phosphorylation and fermentation reactions co-evolved and were the rst forms of energy metabolism that cells used to generate ATP, then what would be the consequences of such reactions over time? What if these were the only forms of energy metabolism available over hundreds of thousands of years? What if cells were isolated in a small closed environment? What if the small reduced substrates were not being produced at the same rate of consumption during this time? Consequences of fermentation Imagine the world where fermentation is the primary mode for extracting energy from small molecules. As populations thrive, they reproduce and consume the abundance of small reduced organic molecules in the environment, producing acids. One consequence is the acidication (decrease of ph) of the environment, including the internal cellular environment. This is not so good, since changes in ph can have a profound inuence on the function and interactions among various biomolecules. Therefore mechanisms needed to evolved that could remove the various acids. Fortunately, in an environment rich in reduced compounds, substrate level phosphorylation and fermentation can produce large quantities of ATP. It is hypothesized that this scenario was the beginning of the evolution of the F 0 F 1 ATPase, a molecular machine that hydrolyzes ATP and translocates protons across the membrane (we'll see this again in the next section). With the F 0 F 1 ATPase, the ATP produced from fermentation could now allow for the cell to maintain ph homeostasis by coupling the free energy of hydrolysis of ATP to the transport of protons out of the cell. The down side is that now cells are pumping all of these protons into the environment, which will now start to acidify. note: If the hyposthesis is correct, that the F 0 F 1 ATPase also co-evolved with substrate level phosphorylation and fermentation reactions, then what would happen over time to the environment? While small reduced organic compounds may have been initially abundant, if fermentation "took o" at some point the reduced compounds would run out and ATP might then become scarce as well. That's a problem. Thinking with the design challenge rubric dene the problem(s) facing the cell in this hypothesized environment. What are other potential mechanism or ways Nature could overcome the problem(s)? Exercise 1 (Solution on p. 7.) What reactants are used up in glycolysis (need to be replaced)? a. NAD+ b. NADH c. ATP d. ADP e. glucose

6 OpenStax-CNX module: m f. glycolytic enzymes g. a, c and d h. a and e i. all of the above Exercise 2 (Solution on p. 7.) Which reactants that are used up in glycolysis are "replaced" by the act of fermenting? a. NAD+ b. NADH c. ATP d. ADP e. glucose f. glycolytic enzymes g. a, c and d h. a and e i. all of the above

7 OpenStax-CNX module: m Solutions to Exercises in this Module Solution to Exercise (p. 5) h Solution to Exercise (p. 6) a

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