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Related Concept Videos

The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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...
Primary Active Transport01:29

Primary Active Transport

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 not...
Primary Active Transport01:29

Primary Active Transport

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 not...
Primary Active Transport01:47

Primary Active Transport

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 that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they...
Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...

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Related Experiment Video

Updated: Jun 10, 2026

Demonstration of Membrane Transport of Histidine using Goat Intestinal Inverted Sacs: An Experiential Pedagogical Tool for Undergraduates
04:40

Demonstration of Membrane Transport of Histidine using Goat Intestinal Inverted Sacs: An Experiential Pedagogical Tool for Undergraduates

Published on: October 4, 2024

Membrane transport in primitive cells.

Sheref S Mansy1

  • 1Armenise-Harvard Laboratory of Synthetic and Reconstructive Biology, Centre for Integrative Biology (CIBIO), University of Trento, Italy. mansy@science.unitn.it

Cold Spring Harbor Perspectives in Biology
|August 4, 2010
PubMed
Summary
This summary is machine-generated.

Model protocellular membranes made of monoacyl lipids allow polar molecules to pass through, potentially enabling early cell functions. This increased permeability, driven by lipid dynamics, supports life-like processes from simple molecules.

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Last Updated: Jun 10, 2026

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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles

Published on: December 31, 2019

Area of Science:

  • Biochemistry
  • Origin of Life Studies
  • Membrane Biophysics

Background:

  • Contemporary cell membranes utilize diacyl lipids.
  • Protocellular membranes are hypothesized to have different lipid compositions.
  • Understanding early membrane properties is crucial for origin of life research.

Purpose of the Study:

  • To investigate the properties of model protocellular membranes composed of monoacyl lipids.
  • To compare monoacyl lipid membranes with contemporary diacyl lipid membranes.
  • To explore the functional implications of monoacyl lipid membrane permeability.

Main Methods:

  • Construction of model protocellular membranes using monoacyl lipids.
  • Analysis of solute transport across these model membranes.
  • Investigation of lipid dynamics within the membrane structure.

Main Results:

  • Model protocellular membranes composed of monoacyl lipids permit the passage of polar solutes.
  • This permeability is attributed to increased lipid dynamics within the membrane.
  • These membranes exhibit selective permeability, facilitating life-like processes.

Conclusions:

  • Monoacyl lipid-based protocellular membranes offer a pathway for primitive transport without complex machinery.
  • Increased lipid dynamics are key to the functional properties of these early membrane models.
  • Such membranes provide a foundation for the emergence of cellular functions from simple molecular components.