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Related Concept Videos

Protein Folding01:22

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Protein Folding01:25

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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.
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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...
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Protein Organization01:24

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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.

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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
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Sequence composition and environment effects on residue fluctuations in protein structures.

Anatoly M Ruvinsky1, Ilya A Vakser

  • 1Center for Bioinformatics, The University of Kansas, Lawrence, Kansas 66047, USA. ruvinsky@ku.edu

The Journal of Chemical Physics
|October 26, 2010
PubMed
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Protein structure fluctuations are influenced by residue type and location. Highly fluctuating residues like Glycine and Alanine are found in flexible regions, impacting protein stability and interactions.

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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

Published on: July 14, 2015

Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Protein structure fluctuations are critical for cellular processes like allostery and energy transfer.
  • Understanding the link between protein sequence and dynamic behavior is essential for predicting protein function and stability.

Purpose of the Study:

  • To analyze the relationship between amino acid sequence composition and residue fluctuation distribution in protein-protein complexes.
  • To develop a model that accounts for non-uniform mass distribution and interatomic interactions in predicting protein dynamics.

Main Methods:

  • Developed a statistical-thermodynamic analysis using a one-node-per-residue elastic network model.
  • Incorporated nonhomogeneous protein mass distribution and renormalized inter-residue potentials.
  • Analyzed residue fluctuations based on protein mass distribution and local residue environment.

Main Results:

  • Protein mass distribution and residue environment are key determinants of fluctuation scale.
  • Surface residues exhibit greater fluctuations than core residues.
  • Classified amino acids into highly (Gly, Ala, Ser, Pro, Asp), moderately (Thr, Asn, Gln, Lys, Glu, Arg, Val, Cys), and weakly fluctuating (Ile, Leu, Met, Phe, Tyr, Trp, His) groups.
  • Identified that protein interfaces are generally more rigid than other surface areas, with specific residues (Gly, Ala, Ser, Cys, Leu, Trp) favoring stable docking.

Conclusions:

  • Protein structural instability may correlate with high-fluctuation residues in disordered regions.
  • The sequence composition of protein loops strongly influences residue fluctuations.
  • Findings provide insights into protein association mechanisms and structural stability.