proton motor force
In mitochondria energy released by the electron transport chain is used to move protons from the mitochondrial matrix. Energy that is generated by the transfer of protons or electrons across an energy-transducing membrane and that can be used for chemical osmotic or mechanical work.
Cadeia Transportadora De Eletrons E Fosforilacao Oxidativa Esses Dois Processos Ocorrem Nas Cristas Fosforilacao Oxidativa Respiracao Celular Ciclo De Krebs
Energy coupling by a proton-motive force.
. The proton motive force occurs when the cell membrane becomes energized due to electron transport reactions by the electron carriers embedded in it. Basically this causes the cell to act like a tiny battery. Experiments with the aerotolerant anaerobe Streptococcus lactis provide the opportunity for determining the proton motive force Deltap in dividing cells.
Proton motive force is the force created by the transfer of protons or electrons across a membrane that can be used for chemical mechanical or osmotic processes. Schiebel Driessen Hartl. Its energy can either be used right away to do work like power flagella or be stored for later in ATP.
The proton motive force therefore does not contribute to the process of DNA binding and valinomycin and nigericin interact directly with the DNA binding sites at the cell envelope. The two components of Deltap DeltaPsi the transmembrane potential and DeltapH the chemical gradient of H were determined by the accumulation of radiolabeled tetraphenylphosphonium. Basically this causes the cell to act like a tiny battery.
Bacterial membranes can generate the proton-motive force PMF through the electron transport chain and it is known that SecYEG transduces the energy available in the PMF to stimulate protein translocation Brundage et al 1990. Effect of proton motive force. The effects of ionophores weak acids and tetraphenylphosphonium on the components of the proton motive force and on the entry of transforming DNA after binding.
Shiozuka Tani Mizushima Tokuda 1990. It has been suggested that proton motive force powers DNA transport. Geller Movva.
The proton-motive force created by the pumping out of protons by the respiratory chain complexes is in the mitochondria of most tissues mainly used to translocate protons through the ATP synthase complex leading to the formation of. Accumulation of neutral amino acids by Streptococcus faecalis. Experiments with bulk-competent cultures have shown that DNA transport is dependent on the proton gradient but it has not been resolved whether the inhibition was caused by proton motive force or by the secondary effect of inhibition of F 0 F 1 ATPase 12.
- one function of the respiratory chain is to regenerate NAD for glycolysis. Proton-motive force can be generated by a variety of phenomena including the operation of an electron transport chain illumination of a PURPLE MEMBRANE and the hydrolysis of ATP by a proton ATPase. The proton motive force occurs when the cell membrane becomes energized due to electron transport reactions by the electron carriers embedded in it.
The force of the proton gradient what does the rotation of the c ring power the rotation of the c ring powers the movement of the y gamma subunit which in. Asghar SS Levin E Harold FM. Proton-coupled accumulation of galactoside in Streptococcus lactis 7962.
Proton motive force PMF a source of energy resulting from the separation of protons from hydroxyl ions across the cytoplasmic membrane generating a membrane potential. Electrons from cytoplasmic NADH enter mitochondria by shuttles. It promotes the movement of electrons against the electrochemical potential.
In most cases the proton-motive force is generated by an electron transport chain which acts as a proton pump using the Gibbs free energy of redox reactions to pump protons hydrogen ions out across the membrane separating the charge across the membrane. Google Scholar Kashket ER Wilson TH.
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