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Related Concept Videos

The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
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Solute flux through a fluctuating membrane channel.

Alexander M Berezhkovskii1, Sergey M Bezrukov1

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Fluctuating side chains in protein channels unexpectedly enhance solute transport as fluctuations increase. This suggests that even "closed" channel states may remain permeable, impacting biological transport mechanisms.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Membrane Transport

Background:

  • Biological membrane protein channels exhibit dynamic thermal fluctuations.
  • Channel gating, a key fluctuation, regulates transport but doesn't encompass all dynamic effects.
  • Side chain fluctuations can significantly alter channel transport properties.

Purpose of the Study:

  • To investigate the impact of a fluctuating side chain on protein channel transport.
  • To analyze how side chain dynamics affect solute flux in a two-state channel model.
  • To determine if the blocking effect of side chains diminishes with increased fluctuation rates.

Main Methods:

  • Utilized a continuum diffusion model for a two-state, three-dimensional cylindrical channel.
  • Simulated random transitions between open and blocked channel states.
  • Analyzed solute dynamics and conformational fluctuation timescales.

Main Results:

  • The simple relationship between average flux and state-specific fluxes breaks down when fluctuation and solute dynamics timescales are comparable.
  • The blocking effect of a side chain decreases as the rate of conformational fluctuations increases.
  • This reduction in blocking is independent of blockage degree and probability.

Conclusions:

  • Increased side chain fluctuation rates enhance solute transport through protein channels.
  • The "closed" states observed in structural studies may still allow solute transport.
  • Dynamic fluctuations play a critical, often underestimated, role in channel permeability.