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Related Concept Videos

Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal cells...
Eukaryotic Compartmentalizations01:46

Eukaryotic Compartmentalizations

One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
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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...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Assembly of Signaling Complexes

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Preparation and Maintenance of Dorsal Root Ganglia Neurons in Compartmented Cultures
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Published on: October 17, 2008

Compartmentation of NAD+-dependent signalling.

Friedrich Koch-Nolte1, Stefan Fischer, Friedrich Haag

  • 1Institute of Immunology, University Medical Center, Hamburg, Germany. nolte@uke.de

FEBS Letters
|March 30, 2011
PubMed
Summary

Nicotinamide adenine dinucleotide (NAD+) has crucial roles in energy and signaling. This review explores NAD+ compartmentation and the enzymes controlling its signaling pathways across cellular compartments.

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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Molecular Biology

Background:

  • Nicotinamide adenine dinucleotide (NAD+) is essential for cellular energy metabolism as a redox carrier.
  • Emerging research highlights NAD+'s critical signaling functions, often involving its consumption.
  • NAD+ is synthesized in the cytosol, nucleus, and mitochondria, but is also found in vesicular and extracellular spaces.

Purpose of the Study:

  • To review current knowledge on the compartmentation of NAD+.
  • To examine the biochemistry of NAD+-converting enzymes.
  • To elucidate how these enzymes control NAD+ signaling in various cellular locations.

Main Methods:

  • Literature review of existing research on NAD+ metabolism and signaling.
  • Analysis of molecular characterization of key enzyme families: ADP-ribosyltransferases (ARTs), Sirtuins (SIRTs), and NAD+ glycohydrolases (NADases).
  • Integration of findings on NAD+ localization and enzymatic activity across different cellular compartments.

Main Results:

  • Three major protein families (ARTs, SIRTs, NADases) consume NAD+ for signaling.
  • These enzymes regulate diverse cellular processes, including gene expression, mitochondrial nitrogen metabolism, and tissue damage sensing.
  • Evidence suggests distinct NAD+ pools are critical for specific signaling functions within different compartments.

Conclusions:

  • Cellular compartmentation of NAD+ and its associated enzymes is vital for regulating diverse biological processes.
  • Understanding the biochemistry and localization of NAD+-converting enzymes is key to deciphering NAD+ signaling.
  • Further research into distinct NAD+ pools may reveal novel therapeutic targets.