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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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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...
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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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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.
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Synthesis of Phosphatidylcholine in the ER Membrane01:27

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The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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Coupling lipid synthesis with nuclear envelope remodeling.

Sarah R Barger1, Lauren Penfield1, Shirin Bahmanyar1

  • 1Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT, USA.

Trends in Biochemical Sciences
|September 24, 2021
PubMed
Summary

Lipids produced in the endoplasmic reticulum (ER) and at the nuclear envelope (NE) dynamically remodel NE membranes. This lipid biosynthesis coordinates NE remodeling to ensure genome protection.

Keywords:
CTDNEP1ESCRTNem1diacylglycerolendoplasmic reticuluminner nuclear membranelipid synthesislipinnuclear envelopenuclear envelope remodelingphosphatidic acid

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The nuclear envelope (NE) protects the genome but undergoes dynamic remodeling essential for cell function.
  • While protein roles in NE remodeling are known, the lipid bilayer and lipid-protein interactions are less understood.
  • The NE is connected to the endoplasmic reticulum (ER), suggesting ER-synthesized lipids impact NE structure.

Purpose of the Study:

  • To review the roles of ER- and NE-synthesized lipids in nuclear membrane dynamics.
  • To explore how lipid biosynthesis coordinates NE remodeling for genome protection.

Main Methods:

  • Literature review of recent studies on nuclear envelope lipid dynamics.
  • Analysis of lipid species and their interactions with proteins at the NE.
  • Examination of lipid biosynthesis pathways in relation to NE remodeling.

Main Results:

  • Emerging evidence highlights specific lipid species synthesized in the ER and at the NE that regulate NE membrane remodeling.
  • Lipid-protein interactions are crucial for defining and sculpting nuclear membranes.
  • Lipid biosynthesis is coordinated with NE remodeling processes.

Conclusions:

  • Lipids play critical, yet underappreciated, roles in nuclear envelope dynamics and genome maintenance.
  • Understanding lipid regulation of the NE offers new insights into cell growth and protection.