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Related Concept Videos

Proteomics01:33

Proteomics

10.0K
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Single-pass Transmembrane Proteins01:25

Single-pass Transmembrane Proteins

6.9K
Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Membrane Proteins01:30

Membrane Proteins

31.0K
Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
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Insertion of Multi-pass Transmembrane Proteins in the RER01:29

Insertion of Multi-pass Transmembrane Proteins in the RER

19.0K
The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...
19.0K
Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

18.5K
Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
18.5K
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

13.5K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Related Experiment Video

Updated: Feb 26, 2026

Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry

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Integral membrane proteins: bottom-up, top-down and structural proteomics.

Upendra K Kar1, Margaret Simonian2, Julian P Whitelegge2

  • 1a Department of Pharmaceutical Sciences, College of Pharmacy , University of Arkansas for Medical Sciences , Little Rock , AR , USA.

Expert Review of Proteomics
|July 25, 2017
PubMed
Summary

Advanced mass spectrometry techniques now provide comprehensive analysis of integral membrane proteins, crucial for understanding cellular functions and developing new drugs. These methods improve coverage of transmembrane domains, aiding in drug target identification.

Keywords:
CyTOFFASPFPOPFT-ICRHDXLILBIDProteomebilayermicellenanodisc

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Area of Science:

  • Proteomics
  • Biochemistry
  • Cell Biology

Background:

  • Integral membrane proteins are vital for cellular functions and represent significant drug targets.
  • Current proteomic strategies often struggle with analyzing transmembrane domains.

Purpose of the Study:

  • To review recent technical advancements in integral membrane protein analysis.
  • To highlight the impact of these advancements on drug discovery and clinical applications.

Main Methods:

  • Survey of publicly available resources (e.g., PubMed).
  • Analysis of bottom-up and top-down mass spectrometry techniques.
  • Integration of native mass spectrometry and cross-linking strategies.

Main Results:

  • Bottom-up proteomics offers near-complete coverage but limited transmembrane domain analysis.
  • Top-down mass spectrometry provides excellent coverage of transmembrane regions.
  • Native mass spectrometry and cross-linking yield insights into protein complexes, stoichiometry, and lipid binding.

Conclusions:

  • Integral membrane proteins are increasingly amenable to advanced proteomic and mass spectrometry techniques.
  • These technological leaps are paving the way for novel therapeutic strategies and clinical applications.