Joke Collection Website - Mood Talk - The Na+-K+ pump is taken as an example to illustrate the active transport process of cell membrane.
The Na+-K+ pump is taken as an example to illustrate the active transport process of cell membrane.
The energy required for active transportation mainly includes: ① ion gradient power in cooperative transportation; ② ATP-driven pump obtains energy by hydrolyzing ATP; (3) optically driven pump uses light energy to transport substances, which exist in bacteria.
Na+-K+ pump: A tetramer consisting of two large subunits and two small subunits, which is actually Na+-K+ATPase, is distributed in the plasma membrane of animal cells.
Working principle of sodium-potassium pump;
(1) Na+-K+ ATPase undergoes conformational changes through phosphorylation and dephosphorylation, resulting in changes in its affinity with na+and k+.
(2) Na+ binds to the enzyme inside the membrane, activates the activity of ATPase, decomposes ATP, phosphorylates the enzyme, changes the conformation, and the binding site of Na+ shifts to the outside of the membrane; This phosphorylase has low affinity for Na+ and high affinity for K+, so it releases Na+ outside the membrane and binds to K+.
(3) After K+ binds to phosphorylase, the enzyme is dephosphorylated, and the conformation of the enzyme returns to its original state, so the binding site of K+ turns into the membrane, and the affinity of K+ with the enzyme decreases, thus releasing the combination of K+and Na+ in the membrane.
(4) Each cycle consumes one ATP;; Three Na+ s are shipped out and two K+ s are shipped in.
The function of Na+-K+ pump: ① maintaining the permeability and volume of cells; ② Maintain the intracellular environment with low Na+ and high K+; ③ Maintain the resting potential of cells.
- Previous article:Let's talk about the taste of solid wood laminate first.
- Next article:Second grade animal composition
- Related articles
- Sentences describing the beauty of the desert
- Short sentences describing how time flies (32 selected sentences)
- Prose appreciation of old houses
- What does tree hole cp mean?
- Tell me about a person's state.
- Public Punishment: Conversation in QQ Space in Those Years —— Literary and Artistic Sao Year (First Bomb)
- Put down the photo of my sister and say it.
- My female colleague said I was her brother. What does she mean by telling everyone that the leader knows that I am her brother?
- Talk about the circle of friends.
- Interesting wedding greetings