The chemiosmotic mechanism also operates in photophosphorylation.
At physiological pH, ADP exists as ADP3-, and ATP as ATP4-. The inner membrane contains a well-characterized transporter, known as the adenine nucleotide translocator (20). This transporter catalyzes the counterexchange translocation of ADP3- and ATP4-. The one-for-one exchange transport (antiport), with ATP4- exported from the mitochondrion and ADP3- imported, is electrogenic; there would be the net transfer of one negative charge out of the mitochondrion per transport event. The Dy across the mitochondrial inner membrane is outside positive. Thus,exchange transport would be promoted in the direction of ATP export and ADP import by the Dy generated by electron flow.
Photophosphorylation and the chemiosmotic perspective.
These results show that protons pass out of the thylakoids at the site ofATPsynthesis and that this leakage is inhibited by ADP, ATP or Dio-9, compounds that interact with ...These data are in support of the chemiosmotic theory of ...
Metabolic pathways carry out reactions that capture energy from these various sources (organic compounds, sunlight or chemicals) and couple them to synthesis of ATP from ADP.
that the synthesis of ATP generates a proton ..
Summary This chapter contains sections titled: Chemical aspects ofATP and the phosphoanhydride bonds Historical perspective on ATPsynthesis Quantitati...
Chemiosmotic phosphorylation is the third, ..
The earliest cells, prokaryotes living in an early Earth devoid of free oxygen, used various alternative electron acceptors to carry on anaerobic cellular respiration. After cyanobacteria invented oxygenic photosynthesis and pumped oxygen gas into the oceans and atmosphere, bacteria that adapted their electron transport chains to exploit oxygen as the terminal electron acceptor gained higher energy yield and thus a competitive advantage. One line of aerobic bacteria took up an endosymbiotic relationship within a larger host cell, providing ATP in exchange for organic molecules. The endosymbiont was the evolutionary ancestor of mitochondria. This endosymbiosis must have occurred in the ancestor of all eukaryotes, because all existing eukaryotes have mitochondria (Martin and Mentel, 2010). The evidence for the endosymbiont origin of mitochondria can be found in:
ATP synthesis (chemiosmotic theory) - YouTube
A mechano-chemiosmotic model for the coupling of electron and proton transfer to ATPsynthesis in energy-transforming membranes: a personal perspective....In the process ofATPsynthesis, energy is first, predominantly, used in the de...
May 03, 2013 · ATP synthesis (chemiosmotic theory ..
Chemiosmotic coupling in cyanobacteria: ATPsynthesis in a two-membrane system *The phosphorylation potential in cyanobacteria (blue-green algae) is linked to two different proton motive forces (proton electrochemical gradients), one ...
The energy for ATP synthesis comes from ..
In addition to ATP synthesis, prokaryotic cells can use the proton motive force to supply energy for active transport of molecules across the plasma membrane, and to power the motor complex that rotates the bacterial .