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Functions of Aquaporins in mammals

Functions of Aquaporins in mammals. Nephron. The role of Aquaporins in the kidney. Kidney. Cortex. proximal tubules. collecting duct. Aqp0. urine concentration reabsorption of water into blood. Aqp0. The role of Aquaporins in the kidney. monomers. tetramers.

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Functions of Aquaporins in mammals

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  1. Functions of Aquaporins in mammals

  2. Nephron The role of Aquaporins in the kidney Kidney Cortex proximal tubules collecting duct Aqp0 urine concentration reabsorption of water into blood Aqp0

  3. The role of Aquaporins in the kidney monomers tetramers

  4. Glycerol Channel and the Aquaporin Family water transport in cells: aquaporins water+glycerol transport: aquaglycoporins ions and charged solutes excluded from transport tetrameric architecture

  5. GlpF Simulation: Advanced and large scale full electrostatics (PME), periodic boundary conditions NpT ensemble at 310 K 1 ns equilibration protein ~ 15,000 atoms lipids ~ 40,000 atoms water ~ 51,000 atoms all ~ 106,000 atoms 2002: 12 days/ns – 64 T3E CPU

  6. Note the curved adjustment between lipids and protein

  7. Competition of water and glycerol for H-bonds

  8. Simulated System 2: GlpF with one glycerol per channel: initial state GlpF with one glycerol per channel: after 1ns entire conduction event needs to be enforced

  9. Steered MD simulation of glycerol passage through GlpF

  10. Challenge: Quantitative analysis of SMD potential of mean force (PMF) is reconstructed from time series of applied force and displacement non-equilibrium analysis based on Langevin equation: multiple trajectories can be combined to yield statistically significant results But: one needs to discount irreversible work!

  11. Constructing the potential of mean force

  12. Potential of mean force along channel axis attractive extra- cellular vestibule

  13. Simulated system 3: GlpF with only water

  14. GlpF crystallography without glycerol

  15. Water arrangement in GlpF from MD at 300K from x-ray diffract. at 100K

  16. Bipolar orientation and diffusion of water through GlpF orientation diffusion

  17. Filtering mechanism in GlpF

  18. water pair correlation Correlated water dynamics in the channel correlated displacement of waters in channel

  19. Aquaporin: seeing waters in motion

  20. Pressure-induced water conduction in GlpF p=0 p>0 p<0

  21. Pressure-induced water conduction in GlpF

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