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Related Concept Videos

The Replisome03:01

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The Replisome03:01

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
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Identifying key components of the PrPC-PrPSc replicative interface.

Gil C Abalos1, Justin T Cruite, Anne Bellon

  • 1Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA.

The Journal of Biological Chemistry
|October 2, 2008
PubMed
Summary
This summary is machine-generated.

Specific regions of the prion protein (PrP) are critical for prion disease propagation. Mutations in PrP sequences 98-110 and 136-140 block the conversion of cellular prion protein (PrP(C)) to its disease-associated form (PrP(Sc)).

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Prion diseases involve the misfolding of cellular prion protein (PrP(C)) into infectious PrP(Sc) conformers.
  • Direct interaction between PrP(C) and PrP(Sc) is essential for prion replication but remains poorly understood.

Purpose of the Study:

  • To investigate the role of specific PrP regions (23-33, 98-110, and 136-158) in the conversion of PrP(C) to PrP(Sc).
  • To identify key sequences involved in the prion replication interface.

Main Methods:

  • Epitope-tagged mouse PrP(C) molecules with modified sequences (23-33, 98-110, 136-158) were created.
  • Mutant PrP(C) was expressed in prion-infected ScN2a cells.
  • Conversion of mutated PrP(C) to PrP(Sc) was compared to wild-type PrP(C).

Main Results:

  • Mutations within the PrP 98-110 region (lysine to alanine substitutions) completely prevented PrP(Sc) conversion.
  • Modifications within the PrP 136-140 region (scrambling, alanine substitution) also halted PrP(Sc) conversion.
  • Mutations in regions 23-33 and 101-104 did not impede PrP(Sc) conversion.

Conclusions:

  • PrP sequences 98-110 and 136-140 are crucial for both PrP(C)-PrP(Sc) interaction and the conversion process.
  • These regions likely form a critical part of the prion replicative interface.
  • Targeting these regions may offer therapeutic strategies for prion diseases.