Outsid nside A model of facilitated diffusion The membrane carrier can change conformation after binding an external molecule and subsequently release the molecule on the cell interior.It then returns to the outward oriented position and is ready to bind another solute molecule. Because there is no energy input,molecules will continue to enter only as long as their concentration is greater on the outside
The membrane carrier can change conformation after binding an external molecule and subsequently release the molecule on the cell interior. It then returns to the outward oriented position and is ready to bind another solute molecule. A model of facilitated diffusion Because there is no energy input, molecules will continue to enter only as long as their concentration is greater on the outside. T4007.gif
Active transport H+ H H H+ H OHOH.OH OH OH OH- Sulfate H symporter Phosphate OH- OH Potassium symporter H + unoporter OH OH Outside Inside Membrane Active transport is the transport of solute molecules to higher concentrations,or against a concentration gradient,with the use of metabolic energy input
Active transport is the transport of solute molecules to higher concentrations, or against a concentration gradient, with the use of metabolic energy input. Active transport T4008.gif
Group translocation Inside Outside Pyruvate Glucose Glucose 6-P Cytoplasmic membrane
Group translocation
Group translocation The best-known group translocation system is the phosphoenolpyruvate:sugar phosphotransferase system (PTS),which transports a variety of sugars into procaryotic cells while Simultaneously phosphorylating them using phosphoenolpyruvate (PEP)as the phosphate donor. PEP+sugar (outside) pyruvate sugar-P (inside
The best-known group translocation system is the phosphoenolpyruvate: sugar phosphotransferase system (PTS), which transports a variety of sugars into procaryotic cells while Simultaneously phosphorylating them using phosphoenolpyruvate (PEP) as the phosphate donor. Group translocation PEP + sugar (outside) pyruvate + sugar-P (inside)
The phosphoenolpyruvate:sugar phosphotransferase system of E.coli.The following components are involved in the system:phosphoenolpyruvate,PEP, enzyme 1,E I;the low molecular weight heat-stable protein,HPr;enzyme 11,E II,-and enzyme IIl,E III. Inside Outside Enz Pyruvate Glucose Glucose 6-P Cytoplasmic membrane
The phosphoenolpyruvate: sugar phosphotransferase system of E. coli. The following components are involved in the system: phosphoenolpyruvate, PEP; enzyme 1, E I; the low molecular weight heat-stable protein, HPr; enzyme 11, E II,- and enzyme III, E III