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Related Concept Videos

Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
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In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
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Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
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Transport Across the Golgi01:26

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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Vesicular Tubular Clusters01:45

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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Protein Transport to the Stroma01:24

Protein Transport to the Stroma

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Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
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Related Experiment Video

Updated: Dec 12, 2025

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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SLC6 transporter oligomerization.

Kumaresan Jayaraman1, Anand K Das2, Dino Luethi1,2

  • 1Institute of Pharmacology, Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria.

Journal of Neurochemistry
|August 9, 2020
PubMed
Summary
This summary is machine-generated.

Solute carrier 6 (SLC6) transporters, crucial for neurotransmitter reuptake, form various oligomers. Plasma membrane interactions stabilize these assemblies, influencing transporter function and psychostimulant activity.

Keywords:
PIP2Quaternary structureneurotransmitter transporteroligomerizationpsychostimulanttransporter-mediated efflux

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Solute carrier 6 (SLC6) family transporters mediate neurotransmitter reuptake via sodium gradients.
  • These 12-transmembrane proteins exist as monomers or multi-subunit oligomers.
  • Oligomerization is crucial for endoplasmic reticulum to plasma membrane trafficking and stabilization.

Purpose of the Study:

  • To review the impact of plasma membrane components on SLC6 transporter oligomerization.
  • To describe protomer interfaces within SLC6 transporter oligomers.
  • To highlight open questions regarding SLC6 transporter quaternary structure and function.

Main Methods:

  • Literature review of studies on SLC6 transporter structure and function.
  • Analysis of single molecule microscopy data on transporter stoichiometry.
  • Examination of the role of phosphoinositides in stabilizing transporter oligomers.

Main Results:

  • SLC6 transporter oligomerization is essential for protein trafficking and plasma membrane stability.
  • Oligomerization interfaces between protomers are being elucidated.
  • Stoichiometry varies across different SLC6 family members, as revealed by single-molecule studies.

Conclusions:

  • Plasma membrane constituents significantly influence SLC6 transporter oligomerization.
  • Understanding oligomerization is key to comprehending transporter regulation and function.
  • Further research is needed to fully elucidate the functional consequences of SLC6 transporter quaternary arrangements.