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Related Concept Videos

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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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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.
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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Receptor-mediated Endocytosis01:20

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Related Experiment Video

Updated: Mar 8, 2026

A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2
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A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2

Published on: September 26, 2025

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Hanatoxin inserts into phospholipid membranes without pore formation.

Kuo-Long Lou1, Meng-Hsuan Hsieh2, Wei-Jung Chen3

  • 1Membrane Protein Research Core, Center for Biotechnology, National Taiwan University, Taipei 10672, Taiwan; Institute of Biotechnology, National Taiwan University, Taipei 10672, Taiwan.

Biochimica Et Biophysica Acta. Biomembranes
|February 2, 2017
PubMed
Summary

Hanatoxin (HaTx) directly binds to phospholipid bilayers, inserting into the membrane

Keywords:
HanatoxinLiposomal vesicle membranesMembrane partitioningPeptide-lipid interactionsTransition temperature for phospholipids

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Hanatoxin (HaTx) is a spider venom polypeptide that inhibits Kv2.1 channels.
  • The precise mechanism by which HaTx interacts with cell membranes and modulates channel gating is not fully understood.

Purpose of the Study:

  • To elucidate the interaction pattern of HaTx with phospholipid bilayers.
  • To define the mechanism of HaTx binding to membranes.

Main Methods:

  • High-performance liquid chromatography (HPLC) to assess toxin binding to liposomes.
  • Dynamic light scattering (DLS) and leakage assays to evaluate membrane integrity.
  • Langmuir trough experiments to study HaTx interaction with phospholipid monolayers.

Main Results:

  • HPLC confirmed direct binding of HaTx to liposomal membranes.
  • DLS and leakage assays showed no evidence of pore formation or membrane fragmentation.
  • Langmuir trough experiments indicated HaTx interaction with phospholipid acyl chains.

Conclusions:

  • HaTx interacts with vesicle membranes through a partitioning mechanism.
  • The peptide inserts into the membrane's hydrocarbon core without forming pores.
  • This interaction pattern provides insight into how HaTx modulates Kv2.1 channel activity.