Related Experiment Video

Updated: May 9, 2026

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
10:09

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

Published on: April 28, 2011

High temperature unfolding of a truncated hemoglobin by molecular dynamics simulation

Ravi Datta Sharma1, Rajnee Kanwal, Andrew M Lynn

  • 1Department of Microbiology, C.C.S. University, Meerut, UP, India. ravidattasharma@gmail.com

Journal of Molecular Modeling
|July 11, 2013
PubMed

Insights

Researchers studied the unfolding of Bacillus anthracis hemoglobin (Ba-Glb) using molecular dynamics and spectroscopy. The heme group influences Ba-Glb

Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Protein Dynamics

Background:

  • Heme proteins, including hemoglobin, myoglobin, and cytochrome c, exhibit peroxidase-like activity due to their heme moiety.
  • This activity is generally weak in non-peroxidase proteins, but understanding its structural basis is crucial.

Purpose of the Study:

  • To investigate the unfolding pathway of truncated hemoglobin from Bacillus anthracis (Ba-Glb).
  • To elucidate the specific role of the heme moiety in the unfolding process of Ba-Glb.
  • To explore potential drug discovery targets for anthrax disease management.

Main Methods:

  • Molecular Dynamics (MD) simulations were employed to model the unfolding of Ba-Glb.
  • UV/VIS spectroscopy was used for in vitro validation of the unfolding pathway.
  • Analysis included root-mean-square-deviation (RMSD), Dictionary of Protein Secondary Structure (DSSP), and free energy landscape calculations.

Main Results:

  • The unfolding of Ba-Glb follows a three-state process, featuring a meta-stable intermediate state.
  • Molecular dynamics studies successfully deciphered the unfolding path and the heme group's influence.
  • In vitro UV/VIS spectroscopy corroborated the observed unfolding pathway.

Conclusions:

  • The heme moiety plays a significant role in the unfolding pathway of Ba-Glb.
  • Understanding Ba-Glb structure offers insights into anthrax pathogenesis.
  • This research may lead to novel therapeutic strategies and improved anthrax disease management.

More Related Videos

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches05:56

Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches

Published on: October 13, 2022

Measuring Biomolecular DSC Profiles with Thermolabile Ligands to Rapidly Characterize Folding and Binding Interactions09:15

Measuring Biomolecular DSC Profiles with Thermolabile Ligands to Rapidly Characterize Folding and Binding Interactions

Published on: November 21, 2017

Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Protein Denaturation01:28

Protein Denaturation

The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
Protein and Protein Structure02:15

Protein and Protein Structure

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.
A protein's shape is critical to its function. For example, an enzyme can...
Globular and Fibrous Proteins02:21

Globular and Fibrous Proteins

Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...