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Related Concept Videos

Biosynthesis of Lipids01:29

Biosynthesis of Lipids

Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
What are Membranes?01:54

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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and Golgi...
What are Membranes?01:24

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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...
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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth
07:10

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Published on: June 28, 2019

Peptide membranes in chemical evolution.

W Seth Childers1, Rong Ni, Anil K Mehta

  • 1Center for Fundamental and Applied Molecular Evolution and Center for Chemical Evolution, Department of Chemistry and Biology, Emory University, Atlanta, GA, United States.

Current Opinion in Chemical Biology
|November 3, 2009
PubMed
Summary
This summary is machine-generated.

Simple peptides self-assemble into ordered scaffolds, mirroring biological membranes. These structures show potential for molecular order and catalytic activity, suggesting a pathway for the origin of life through chemical evolution.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Origin of Life Studies
  • Supramolecular Chemistry

Background:

  • Biological membranes, formed by phospholipid assemblies, demonstrate the power of self-organization in aqueous environments.
  • These membrane structures define cellular boundaries and act as scaffolds for biochemical reactions.
  • Understanding self-assembly in simple molecules is key to understanding early life.

Purpose of the Study:

  • To explore the self-assembly of simple peptides into ordered scaffolds.
  • To review evidence for the functional diversity and catalytic potential of these peptide scaffolds.
  • To propose peptide scaffolds as a plausible mechanism for the emergence of chemical evolution.

Main Methods:

  • Review of existing literature on peptide self-assembly.
  • Analysis of data on the structural order and functional capabilities of peptide assemblies.
  • Theoretical consideration of peptide scaffolds in the context of prebiotic chemistry.

Main Results:

  • Simple peptides spontaneously form exceptionally ordered supramolecular structures.
  • These peptide scaffolds exhibit properties analogous to biological membranes in terms of organization.
  • Early data suggests these structures can maintain the functional diversity observed in proteins.

Conclusions:

  • Ordered peptide scaffolds possess the molecular order necessary for complex chemistry.
  • The catalytic agility of these scaffolds supports their role in the emergence of chemical evolution.
  • Peptide self-assembly offers a viable model for prebiotic molecular organization and function.