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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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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.
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Complementary hydropathy identifies a cellular prion protein receptor

V R Martins1, E Graner, J Garcia-Abreu

  • 1Fundação Antônio Prudente, São Paulo, Brazil.

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Researchers identified a cell surface receptor involved in prion diseases. A synthetic peptide mimicking this receptor site and antibodies against it show potential for therapeutic applications against prion toxicity.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Prions cause infectious degenerative encephalopathies by altering normal cell membrane proteins (PrPC).
  • A specific cell-surface receptor is hypothesized to mediate prion entry into cells.
  • Understanding this interaction is crucial for developing treatments for prion diseases.

Purpose of the Study:

  • To identify and characterize the cell-surface receptor for prion binding.
  • To generate reagents that can interfere with prion-receptor interactions.
  • To explore potential therapeutic strategies for prion-induced neurotoxicity.

Main Methods:

  • Utilizing complementary hydropathy to design a peptide mimicking the prion receptor binding site.
  • Raising antibodies against the designed peptide.
  • Testing the binding of the 66-kDa membrane protein to PrPC in vitro and in vivo.
  • Assessing the inhibitory effect of the peptide and antiserum on prion peptide toxicity in neuronal cultures.

Main Results:

  • A hypothetical peptide mimicking the receptor binding site was generated.
  • Antibodies against this peptide identified a 66-kDa membrane protein on mouse neurons.
  • This protein binds PrPC both in vitro and in vivo.
  • The peptide and its antiserum inhibited prion peptide toxicity in cultured neuronal cells.

Conclusions:

  • A potential cell-surface receptor mediating prion endocytosis has been identified.
  • The developed peptide and antibodies show promise in blocking prion toxicity.
  • These findings suggest novel therapeutic avenues for prion-related neurodegenerative diseases.