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Protein Complex Assembly

Protein Complex Assembly

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.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

Protein Complex Assembly

Protein Complex Assembly

Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...

Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Social Exchange Theory

Social Exchange Theory

We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).

Gas Exchange and Transport

Gas Exchange and Transport

Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.

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Related Experiment Video

Updated: Feb 8, 2026

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies

Published on: November 28, 2017

Subunit Exchange in Protein Complexes.

Samuel E Tusk¹, Nicolas J Delalez², Richard M Berry¹

¹Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK.

Journal of Molecular Biology

|July 1, 2018

Summary

This summary is machine-generated.

Protein complexes, once thought stable, are now understood to dynamically exchange components. This protein exchange is widespread across life, varying in timescale and function, and may be the norm.

Keywords:

FRAP bacterial flagellar motor protein exchange stator type III secretion system

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Last Updated: Feb 8, 2026

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies

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Analyzing Large Protein Complexes by Structural Mass Spectrometry

Analyzing Large Protein Complexes by Structural Mass Spectrometry

Published on: June 19, 2010

Area of Science:

Molecular Biology
Biochemistry
Structural Biology

Background:

Traditional methods like X-ray crystallography and electron microscopy provide static views of protein complexes.
Recent studies reveal dynamic component exchange in many protein complexes, challenging previous assumptions of stability.

Purpose of the Study:

To explore the functional significance and prevalence of protein exchange in molecular complexes.
To review existing literature on protein exchange across diverse biological systems.

Main Methods:

Literature review of protein exchange dynamics.
Case study analysis of the bacterial flagella motor.
Survey of protein exchange reports across all domains of life.

Main Results:

Protein exchange occurs in complexes across bacteria, archaea, and eukaryotes.
Observed exchange mechanisms exhibit diverse timescales and functional roles.
The bacterial flagella motor serves as a key example of dynamic protein turnover.

Conclusions:

Protein exchange is a common and functionally important phenomenon in molecular biology.
High-throughput proteomic data suggest component exchange may be the rule, not the exception.
Understanding protein dynamics is crucial for a complete picture of cellular machinery.