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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

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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...
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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.
Sec61 protein conducting channel
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 into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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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Post-translational Translocation of Proteins to the RER01:27

Post-translational Translocation of Proteins to the RER

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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
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SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
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Co-Translational Insertion of Membrane Proteins into Preformed Nanodiscs
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Co-Translational Insertion of Membrane Proteins into Preformed Nanodiscs

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Stitching proteins into membranes, not sew simple.

Paul Whitley, Ismael Mingarro

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    Summary
    This summary is machine-generated.

    Integral membrane protein assembly in the endoplasmic reticulum (ER) is complex. A simple threading model doesn't explain how multi-transmembrane domain proteins insert into membranes, requiring further investigation.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Integral membrane proteins are synthesized co-translationally in the endoplasmic reticulum (ER).
    • The ER translocon facilitates protein insertion and domain passage during membrane protein assembly.
    • Current models of multi-transmembrane domain protein assembly face challenges.

    Purpose of the Study:

    • To review the complexities of membrane protein assembly.
    • To highlight poorly understood aspects of membrane protein insertion.
    • To challenge the simplistic threading model of membrane protein biogenesis.

    Main Methods:

    • Literature review of membrane protein assembly mechanisms.
    • Analysis of existing models for multi-transmembrane domain protein insertion.
    • Discussion of complex cases and unresolved questions in membrane protein biogenesis.

    Main Results:

    • The sequential threading model for membrane protein assembly is insufficient.
    • Multi-transmembrane domain proteins exhibit complex insertion patterns.
    • Several aspects of membrane protein integration into the ER membrane remain poorly understood.

    Conclusions:

    • Membrane protein assembly is more intricate than simple threading.
    • Further research is needed to fully elucidate the mechanisms of membrane protein insertion.
    • Understanding these complexities is crucial for cell biology and disease research.