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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.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
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Primary Active Transport01:29

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Membrane Transporters01:31

Membrane Transporters

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Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
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Cellular Membranes and Drug Transport01:24

Cellular Membranes and Drug Transport

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Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
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Dissecting Large-Scale Structural Transitions in Membrane Transporters Using Advanced Simulation Technologies.

Shashank Pant1, Sepehr Dehghani-Ghahnaviyeh1, Noah Trebesch1

  • 1Theoretical and Computational Biophysics Group, NIH Resource for Macromolecular Modeling and Visualization, Beckman Institute for Advanced Science and Technology, Department of Biochemistry, and Center for Biophysics and Quantitative Biology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801-3028, United States.

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Summary

Membrane transporters control cell functions by alternating access. This review covers simulation techniques to study their large structural changes, crucial for understanding transport mechanisms.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Computational Biophysics

Background:

  • Membrane transporters are essential integral membrane proteins regulating nutrient uptake and waste removal.
  • They function via an alternating access model, involving significant conformational changes.
  • Conventional molecular simulations often struggle to capture these large-scale dynamic transitions.

Purpose of the Study:

  • To provide an overview of major simulation techniques for characterizing membrane transporter dynamics.
  • To discuss the advantages and limitations of these simulation methods.
  • To highlight recent applications of these techniques to membrane transporters.

Main Methods:

  • Review of advanced molecular simulation techniques.
  • Analysis of methods capable of capturing large-scale conformational changes.
  • Discussion of techniques for studying transporter energetics and functional state transitions.

Main Results:

  • Identification and overview of key simulation methodologies applicable to membrane transporters.
  • Comparative analysis of the strengths and weaknesses of different simulation approaches.
  • Illustrative examples of recent successful applications in the field.

Conclusions:

  • Advanced simulation techniques are vital for understanding the dynamic mechanisms of membrane transporters.
  • These methods enable the characterization of large conformational changes and energetics.
  • Future research can leverage these techniques to further elucidate transporter function.