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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.
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Protein Complex Assembly

Protein Complex Assembly

Protein Complexes with Interchangeable Parts

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Protein Complexes with Interchangeable Parts

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Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Ligand Binding Sites

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

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Related Experiment Video

Updated: Jan 27, 2026

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

Published on: October 15, 2018

Protein-Ligand Complexes as Constrained Dynamical Systems.

Burak T Kaynak¹, Pemra Doruker^1,2

¹Department of Computational and Systems Biology, School of Medicine , University of Pittsburgh , Pittsburgh , Pennsylvania 15261 , United States.

Journal of Chemical Information and Modeling

|March 27, 2019

Summary

This summary is machine-generated.

Ligand binding to proteins typically stiffens their vibrational modes, as shown by a universal curve in frequency distributions. This suggests ligands constrain protein dynamics, potentially impacting function.

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Area of Science:

Biophysics
Computational Biology
Structural Biology

Background:

Protein dynamics are crucial for function.
Understanding how ligand binding affects protein vibrations is key.

Purpose of the Study:

To investigate changes in low-frequency protein vibrational spectra upon ligand binding.
To analyze the impact of ligands on protein collective motions using a novel model.

Main Methods:

Utilized a residue-specific (RESPEC) elastic network model with mixed coarse-graining.
Analyzed a large dataset of protein-ligand complexes.
Examined frequency distributions of collective modes.

Main Results:

Observed a universal curve in vibrational frequency distributions across protein-ligand complexes.
Predominantly found positive frequency shifts in protein collective modes after ligand binding.
Demonstrated that ligands impose a constraining effect on protein dynamics.

Conclusions:

Ligand binding generally increases the stiffness of protein vibrational modes.
The observed frequency shifts align with the Rayleigh-Courant-Fisher theorem.
Steeper harmonic potentials due to ligand interactions explain the positive frequency shifts.