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Related Concept Videos

What are Membranes?01:24

What are Membranes?

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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...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Asymmetric Lipid Bilayer01:35

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
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Plasma Membrane in Bacteria and Archaea01:27

Plasma Membrane in Bacteria and Archaea

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The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
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The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Related Experiment Video

Updated: Sep 12, 2025

Investigating the Phagocytosis of Leishmania using Confocal Microscopy
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Investigating the Phagocytosis of Leishmania using Confocal Microscopy

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Leishmania plasma membrane - general composition, structure and biological functions.

Laura Valeria Rios-Barros1, Rachel Magalhães Chiaradia1, Artur Metzker Serravite1

  • 1Departamento de Parasitologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.

Current Topics in Membranes
|August 7, 2025
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Summary

The Leishmania parasite

Keywords:
LeishmaniaMembrane compositionPlasma membrane

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Area of Science:

  • Parasitology
  • Molecular Biology
  • Cell Biology

Background:

  • The plasma membrane (PM) of Leishmania spp. is vital for parasite survival and host adaptation.
  • Its unique lipid, sterol, and protein composition is key to pathogenesis.
  • Distinct PM adaptations exist between promastigote and amastigote forms.

Purpose of the Study:

  • To provide an in-depth exploration of the Leishmania plasma membrane's molecular structure and functions.
  • To integrate current research on PM composition and biological roles.
  • To highlight differences between infective forms and their membrane adaptations.

Main Methods:

  • Literature review and synthesis of existing research on Leishmania plasma membrane.
  • Analysis of key molecules like ergosterol, lipophosphoglycan (LPG), and GP63.
  • Comparative study of promastigote and amastigote membrane characteristics.

Main Results:

  • Leishmania PM composition is crucial for survival in both invertebrate and vertebrate hosts.
  • Specific molecules (ergosterol, LPG, GP63) mediate immune evasion, host cell entry, and survival.
  • Promastigotes and amastigotes display distinct surface molecules and membrane strategies.

Conclusions:

  • Understanding Leishmania PM structure-function is essential for parasite survival and disease.
  • Targeting PM components offers potential for novel therapeutic and vaccine strategies.
  • Further research into PM adaptations can inform leishmaniasis treatment and prevention.