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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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Conjugated Proteins02:50

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Noncovalent Attractions in Biomolecules02:35

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Assembly of Signaling Complexes01:30

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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.
Interaction domains in cell signaling
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Related Experiment Video

Updated: Apr 6, 2026

Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
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How Hydrophilic Proteins Form Nonspecific Complexes.

Ozlem Ulucan1, Volkhard Helms1

  • 1Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany.

The Journal of Physical Chemistry. B
|July 29, 2015
PubMed
Summary

Protein interactions can be specific or nonspecific. Nonspecific protein encounters utilize smaller interfaces and are driven by short-range forces, differing from specific protein-protein binding mechanisms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Proteins in cellular environments interact frequently, but most encounters are transient due to mismatched binding sites.
  • Achieving specific, correct protein-protein interactions requires precise site recognition and alignment, a process not fully understood.
  • The origins of interaction specificity, favoring native interactions over numerous alternatives, remain a key question in molecular biology.

Purpose of the Study:

  • To investigate the characteristics of spontaneously forming nonspecific protein complexes.
  • To understand the physical principles governing protein interaction specificity.
  • To compare the interfaces and interaction forces of nonspecific versus specific protein complexes.

Main Methods:

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  • Utilized molecular dynamics simulations to model protein interactions.
  • Studied three model systems: barnase-barstar, cytochrome c-cytochrome c peroxidase, and enzyme I N-terminal domain-histidine-containing phosphocarrier.
  • Analyzed the interfaces and interaction dynamics of both nonspecific and specific complexes.

    • Main Results:

    • Nonspecific protein encounters form smaller interaction interfaces compared to specific complexes.
    • Short-range direct interactions are the primary drivers for these transient, nonspecific encounters.
    • The study identified distinct features distinguishing specific from nonspecific protein binding events.

    Conclusions:

    • Nonspecific protein interactions are characterized by reduced interface size and dependence on short-range forces.
    • Understanding these nonspecific interactions provides insights into the mechanisms of specific protein recognition.
    • This research contributes to deciphering the rules of protein-protein binding specificity in cellular contexts.