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Related Concept Videos

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
COP Coated Vesicles00:59

COP Coated Vesicles

Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of different...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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Related Experiment Video

Updated: Jun 21, 2026

Biosensor-based High Throughput Biopanning and Bioinformatics Analysis Strategy for the Global Validation of Drug-protein Interactions
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Published on: December 1, 2020

The COPI system: molecular mechanisms and function.

R Beck1, M Rawet, M Ravet

  • 1Yale University School of Medicine, Department of Cell Biology, New Haven, CT 06520, USA.

FEBS Letters
|July 28, 2009
PubMed
Summary
This summary is machine-generated.

This review details the biogenesis and function of COPI vesicles in eukaryotic cells, focusing on coat recruitment, cargo uptake, and vesicle formation. It examines the roles of Arf1 GTPase, Arf1GAPs, and lipids in COPI vesicle dynamics.

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Capture Compound Mass Spectrometry - A Powerful Tool to Identify Novel c-di-GMP Effector Proteins
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Last Updated: Jun 21, 2026

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Published on: December 1, 2020

Genome-wide Mapping of Drug-DNA Interactions in Cells with COSMIC (Crosslinking of Small Molecules to Isolate Chromatin)
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Transport

Background:

  • Vesicular transport is crucial for membrane and protein trafficking in eukaryotic cells.
  • COPI vesicles are key carriers in the early secretory pathway, mediating intracellular transport.
  • Understanding COPI vesicle biogenesis and function is vital for comprehending cellular organization.

Purpose of the Study:

  • To review the biogenesis and functions of COPI vesicles.
  • To focus on the mechanisms of COPI vesicle formation, including coat recruitment, cargo uptake, budding, fission, and coat dissociation.
  • To discuss recent findings on the interplay between COPI machinery, auxiliary proteins, and lipids.

Main Methods:

  • Literature review of recent findings on COPI vesicle formation and function.
  • Analysis of the roles of small GTP binding protein Arf1, Arf1GTPase-activating proteins (Arf1GAPs), and lipids.
  • Evaluation of data concerning the interplay between COPI machinery and auxiliary proteins.

Main Results:

  • COPI vesicle formation involves complex mechanisms of coat recruitment, cargo selection, and membrane budding.
  • The small GTP binding protein Arf1 and its regulators (Arf1GAPs) play critical roles in COPI vesicle dynamics.
  • Lipids and auxiliary proteins significantly influence COPI vesicle formation and function.

Conclusions:

  • COPI vesicles are essential for the early secretory pathway, with intricate mechanisms governing their formation and function.
  • Recent research highlights the coordinated roles of Arf1, Arf1GAPs, and lipids in regulating COPI vesicle trafficking.
  • Further investigation into these interactions will elucidate fundamental aspects of intracellular transport.