ATP-Driven Proton Pumps F-Type ATPases The F-type ATPase active transporters play a central role in energy-conserving reactions in mitochondria, bacteria, and chloroplasts; .The F-type ATPases catalyze the uphill transmembrane passage of protons driven by ATP hydrolysis (“F-type” originated in the identification of these ATPases as energy-coupling f actors). The Fo integral membrane protein complex (subscript o denoting its inhibition by the drug oligomycin) provides a transmembrane pore for protons, and the peripheral protein F1 (subscript 1 indicating that it was the first of several factors isolated from mitochondria) is a molecular machine that uses the energy of ATP to drive protons uphill (into a region of higher H_ concentration). F-Type ATPases The FoF1 organization of proton pumping transporters must have developed very early in evolution. Eubacteria such as E. coli use an FoF1 ATPase complex in their plasma memb...
Flowers are the fascinating organ of plants but had you ever think that how flowers development occurs. And which environmental signals control flowering, and how are those signals perceived? In this blog we will tell this. • How are environmental signals transduced to bring about the developmental changes associated with flowering? Ultimately this process leads to the production of the floral organs—sepals, petals, stamens, and carpels . FLORAL MERISTEMS AND FLORAL ORGAN DEVELOPMENT Floral meristems usually can be distinguished from vegetative meristems, even in the early stages of reproductive development, by their larger size. The transition from vegetative to reproductive development is marked by an increase in the frequency of cell divisions within the central zone of the shoot apical meristem. In the vegetative meristem, the cells of the central zone complete their division cycles slowly. As reproductive development commences, the increase in the size o...
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