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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Protein Organization01:13

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Protein Translocation Machinery on the ER Membrane01:28

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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.
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Related Experiment Video

Updated: Jun 2, 2025

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Stepwise order in protein complex assembly: approaches and emerging themes.

Michael T Brown1, Michael A McMurray1

  • 1Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus School of Medicine , Aurora, CO 80045, USA.

Open Biology
|January 14, 2025
PubMed
Summary

Understanding the assembly order of protein nanomachines is crucial for cell function. This study reviews methods and examples like the 20S proteasome to explore how these essential cellular machines are built step-by-step.

Keywords:
assemblyoligomerizationorderprotein complexessubunits

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Cellular processes rely on complex protein nanomachines.
  • High-resolution structures reveal machine architecture but not assembly dynamics.
  • Co-translational assembly, where subunits interact during translation, is increasingly recognized.

Purpose of the Study:

  • To review methodologies for investigating protein complex assembly order.
  • To discuss assembly order in the context of specific examples: 20S proteasome, septins, and histone octamer.
  • To identify general principles governing multisubunit assembly.

Main Methods:

  • Literature review of established and emerging techniques for studying assembly order.
  • Analysis of case studies focusing on the 20S proteasome core particle, septin complexes, and histone octamer.
  • Comparative analysis of assembly properties across different protein complexes.

Main Results:

  • Assembly order is a critical, yet understudied, aspect of protein complex formation.
  • Co-translational assembly complicates traditional views of stepwise subunit association.
  • Specific examples illustrate diverse assembly pathways and highlight common themes.

Conclusions:

  • Understanding assembly order is key to deciphering how cells build complex protein machinery.
  • Methodological advancements are essential for further insights into in vivo assembly processes.
  • Generalizable principles of assembly order can be derived from studying diverse protein complexes.