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Related Concept Videos

Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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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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Insertion of Multi-pass Transmembrane Proteins in the RER01:29

Insertion of Multi-pass Transmembrane Proteins in the RER

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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...
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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Related Experiment Video

Updated: Aug 19, 2025

A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics

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Cracking outer membrane biogenesis.

Randi L Guest1, Thomas J Silhavy1

  • 1Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Washington Road, Princeton, NJ, 08544, United States of America.

Biochimica Et Biophysica Acta. Molecular Cell Research
|December 1, 2022
PubMed
Summary
This summary is machine-generated.

The Gram-negative bacteria outer membrane is a key barrier to antibiotics. Understanding its biogenesis reveals potential new targets for developing effective Gram-negative antibacterial therapies.

Keywords:
General secretion systemLipopolysaccharide transportLipoprotein transportOuter membranePhospholipid transportbeta-barrel protein assembly machine

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Studying Membrane Biogenesis with a Luciferase-Based Reporter Gene Assay
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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • The outer membrane is a critical component of the Gram-negative bacterial envelope.
  • It functions as a permeability barrier, protecting the cell from environmental threats.
  • This barrier poses a significant challenge for developing effective antibiotics against Gram-negative pathogens.

Purpose of the Study:

  • To summarize foundational knowledge on the Gram-negative outer membrane.
  • To highlight key discoveries regarding its composition and biogenesis pathways.
  • To underscore the potential of outer membrane biogenesis proteins as novel antibiotic targets.

Main Methods:

  • Review of foundational studies on outer membrane discovery and composition.
  • Analysis of established pathways involved in outer membrane construction.
  • Synthesis of current understanding of outer membrane biogenesis.

Main Results:

  • The outer membrane's structure and protective role are well-established.
  • Key pathways governing the assembly of the outer membrane have been elucidated.
  • Proteins integral to outer membrane biogenesis are identified as promising targets.

Conclusions:

  • A comprehensive understanding of the outer membrane is crucial for antibiotic development.
  • Targeting outer membrane biogenesis offers a viable strategy against Gram-negative bacteria.
  • Further research into these pathways can lead to novel antibacterial agents.