منابع مشابه
Proton pumps in bacterial photosynthesis.
We have previously suggested that the cyclic electron-transport chain in Rhodopseudomonas sphaeroides and Rhodopseudomonas capsulata is arranged as two proton pumps operating in series, one pump being associated with the photochemical reaction centre and its immediate secondary donor (cytochrome c2) and acceptor (ubiquinone), and the other with the 'dark' electron transport through which the cy...
متن کامل(proton pumps/proton translocation/chemiosmosis/acid membranes/acid-anions)
Evidence has been gathering from several laboratories that protons in proton-pumping membranes move along or within the bilayer rather than exchange with the bulk phase. These experiments are typically conducted on the natural membrane in vivo or in vitro or on fragments of natural membrane. Anionic lipids are present in all proton-pumping membranes. Model studies on the protonation state of th...
متن کاملVacuolar-type proton pumps in insect epithelia.
Active transepithelial cation transport in insects was initially discovered in Malpighian tubules, and was subsequently also found in other epithelia such as salivary glands, labial glands, midgut and sensory sensilla. Today it appears to be established that the cation pump is a two-component system of a H(+)-transporting V-ATPase and a cation/nH(+) antiporter. After tracing the discovery of th...
متن کاملThe mechanochemistry of V-ATPase proton pumps.
The vacuolar H(+)-ATPases (V-ATPases) are a universal class of proton pumps that are structurally similar to the F-ATPases. Both protein families are characterized by a membrane-bound segment (V(o), F(o)) responsible for the translocation of protons, and a soluble portion, (V(1), F(1)), which supplies the energy for translocation by hydrolyzing ATP. Here we present a mechanochemical model for t...
متن کاملRedox-driven membrane-bound proton pumps.
In recent years, remarkable progress has been made in our understanding of the structure and function of membrane-bound proton transporters at the molecular level. Perhaps the most challenging and complex of these molecular machines are the haem–copper oxidases. These enzymes are designed to activate the kinetically stable O2 molecule, to prevent the release of potentially toxic oxygen intermed...
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ژورنال
عنوان ژورنال: FEBS Letters
سال: 2007
ISSN: 0014-5793
DOI: 10.1016/j.febslet.2007.03.050