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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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Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Structural Protein Function01:56

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Related Experiment Video

Updated: Feb 12, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
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Experimental Characterization of Protein Complex Structure, Dynamics, and Assembly.

Jonathan N Wells1, Joseph A Marsh2

  • 1MRC Human Genetics Unit, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, UK. jonathan.wells@igmm.ed.ac.uk.

Methods in Molecular Biology (Clifton, N.J.)
|April 2, 2018
PubMed
Summary

This chapter reviews key experimental methods for characterizing protein complexes, including X-ray crystallography, cryo-electron microscopy, NMR spectroscopy, and mass spectrometry. Advances enable near-atomic resolution studies of complex dynamics and assembly.

Keywords:
Cryo-electron microscopyMass spectrometryNMRQuaternary structureSuper-resolution microscopyX-ray crystallography

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Area of Science:

  • Biochemistry and structural biology.
  • Molecular and cellular biology.

Background:

  • Understanding protein complexes is crucial for deciphering cellular functions.
  • Experimental characterization methods have significantly advanced our knowledge of the proteome.

Purpose of the Study:

  • To review essential experimental techniques for protein complex characterization.
  • To highlight recent advancements in the field.

Main Methods:

  • X-ray crystallography.
  • Cryo-electron microscopy (cryo-EM).
  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Mass spectrometry (MS).

Main Results:

  • These techniques provide insights into protein complex structure and function.
  • Novel developments allow near-atomic resolution studies of large complexes.
  • Current methods facilitate the analysis of complex dynamics and assembly pathways.

Conclusions:

  • A comprehensive understanding of protein complexes relies on diverse experimental approaches.
  • Ongoing technological progress continues to expand the scope and resolution of protein complex analysis.