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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Membrane Domains01:18

Membrane Domains

The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Nuclear Protein Sorting01:34

Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...

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Related Experiment Video

Updated: Jun 20, 2026

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

Nuclear lipid microdomains regulate cell function.

Elisabetta Albi1, Maristella Villani

  • 1Department of Clinical and Experimental Medicine; Physiopathology Section; University School of Medicine; University of Perugia; Perugia, Italy.

Communicative & Integrative Biology
|August 26, 2009
PubMed
Summary
This summary is machine-generated.

Nuclear lipids, including phosphatidylcholine and sphingomyelin, form complexes with DNA and RNA. These intranuclear lipid complexes act as platforms for gene transcription, revealing their crucial role in cellular processes.

Keywords:
cholesterollipid microdomainsnucleusphosphatidylcholineproliferationsphingomyelin

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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
10:23

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis

Published on: April 17, 2017

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Last Updated: Jun 20, 2026

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
10:23

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis

Published on: April 17, 2017

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nuclear lipids play crucial roles, with high levels of phosphatidylcholine and sphingomyelin linked to cholesterol.
  • Nuclear lipid composition is dynamic, modified by enzymes like sphingomyelinase and phospholipase C during cell life.

Purpose of the Study:

  • To investigate the composition and function of intranuclear lipid complexes.
  • To demonstrate that these complexes represent lipid microdomains on the inner nuclear membrane and serve as transcription platforms.

Main Methods:

  • Analysis of nuclear lipid composition and associated molecules (DNA, RNA, proteins).
  • Characterization of intranuclear complexes resistant to standard purification techniques.

Main Results:

  • Identified an intranuclear complex of lipids, DNA, RNA, and proteins.
  • Demonstrated this complex is a section of the inner nuclear membrane bound to active chromatin.
  • Established these complexes as lipid microdomains functioning as transcription platforms.

Conclusions:

  • Intranuclear lipid complexes are integral components of the inner nuclear membrane.
  • These lipid microdomains are essential platforms facilitating the gene transcription process.