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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Complexes with Interchangeable Parts01:57

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 to...
Protein Complexes with Interchangeable Parts01:57

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 to...
Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

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Related Experiment Video

Updated: Jun 20, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
09:17

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion

Published on: March 1, 2022

Multiscale modeling of proteins.

Valentina Tozzini1

  • 1NEST CNR-INFM, and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy. tozzini@nest.sns.it

Accounts of Chemical Research
|September 30, 2009
PubMed
Summary
This summary is machine-generated.

Multiscale modeling combines various techniques to simulate complex cellular processes across different scales. This approach is crucial for accurately describing biomolecular interactions and is exemplified by studies on green fluorescent proteins and HIV replication proteins.

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Last Updated: Jun 20, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Area of Science:

  • Computational Biology
  • Biophysics
  • Biochemistry

Background:

  • Cellular activity involves complex biomolecular interactions across vast spatial and temporal scales.
  • Existing modeling techniques are often scale-specific, limiting comprehensive analysis.
  • Bridging these scales is essential for a complete understanding of bioprocesses.

Purpose of the Study:

  • To review diverse bio-system modeling methods, from quantum mechanics to coarse-grained and continuum approaches.
  • To explore the integration of these methods into multiscale modeling strategies.
  • To highlight the importance of coherent spatial and temporal matching in multiscale simulations.

Main Methods:

  • Review of quantum mechanics, atomistic force fields, and coarse-grained/continuum simulations.
  • Analysis of multiscale approaches combining different modeling techniques.
  • Examination of challenges in coherently matching models across scales.

Main Results:

  • Identified various modeling techniques suitable for different scales in biological systems.
  • Demonstrated the necessity and application of multiscale approaches for complex bioprocesses.
  • Illustrated the utility of multiscale modeling using green fluorescent proteins (GFPs) and HIV replication proteins (protease, integrase).

Conclusions:

  • Multiscale modeling is vital for accurately describing cellular functions.
  • Coherent integration of models across scales is critical for reliable bioprocess simulation.
  • Studies on GFPs and HIV proteins exemplify the power of multiscale approaches in understanding biological systems and developing therapeutics.