Biology Essay

403 WordsMay 21, 20152 Pages
The function of the protein, Ferredoxin, is regulating the cyclic and non-cyclic electron flow to meet the need of the plant for ATP and reducing power. A study was done that involved the co-expression of Cyanobacterial Flavodoxin and ferredoxin-NADP(+) reductase to see if this specific combination would increase tolerance of oxidative stress in plants. The researchers designed an in vivo system to optimize flavodoxin (electron transferring proteins) reduction and NADP(+) regeneration under stress using a version of cyanobacterial ferredoxin-NADP(+) reductase without the thylakoid binding domain. (They are the site of the light-dependent reactions of photosynthesis.) The co-expression of the two proteins in the chloroplast resulted in maximum tolerance to redox-cycling oxidants, lower damage and decreased reactive oxygen species accumulation. These factors help provide a tool to improve crop tolerance toward environmental hardships. The protein ferredoxin, has the ability to help keep plants alive in diverse and harsh climates, increasing plants quantities which in turn makes them cheaper to use as a biofuel. Another study was done to try an increase the rate of hydrogen photo-production by replacing hydrogenase with a ferredoxin-hydrogenase fusion. Photosynthetic water splitting, along with hydrogenase catalyzed hydrogen production is considered to be a promising clean and renewable source of energy. Restricting this from becoming a reality is oxygen’s sensitivity to hydrogen production and competition between hydrogenases and NADPH dependent carbon dioxide. The researchers determined that under the anaerobic conditions that support hydrogen production, there is a significant loss of photosynthetic electrons toward NADPH production. To limit the competition between hydrogenase and NADPH which is creating a decrease in efficiency of electron flow, the

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