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Structure elements can be predicted using the contact volume among protein residues.

Yasumichi Takase1, Yoichi Yamazaki1, Yugo Hayashi1

  • 1Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan.

Biophysics and Physicobiology
|May 6, 2021
PubMed
Summary

Predicting protein structure elements is crucial. A new computational method using contact volume (CV) accurately identifies these "building blocks" in dihydrofolate reductase (DHFR), offering a faster alternative to experimental analysis.

Keywords:
contact mapfolding elementprecipitate ratio profileprotein foldingresidue–residue contact

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Dihydrofolate reductase (DHFR) structure elements, considered protein "building blocks," are key to understanding protein folding.
  • Experimental Ala-insertion mutation analysis, while informative, is time- and cost-intensive, limiting comprehensive studies.
  • A need exists for efficient computational methods to predict protein structure elements.

Purpose of the Study:

  • To develop and validate a computational method for predicting protein structure elements.
  • To investigate the role of intramolecular residue-residue contacts in protein tertiary structure.
  • To establish structure elements as fundamental units in protein folding and stability.

Main Methods:

  • Utilized crystal structure data of DHFR.
  • Introduced and calculated the overlapped contact volume (CV) parameter for residues along the DHFR sequence.
  • Correlated the CV profile with the precipitate ratio profile used in experimental analysis.

Main Results:

  • The CV profile effectively recapitulated the precipitate ratio profile, enabling prediction of DHFR structure elements.
  • A strong correlation was observed between CV and precipitate ratio, highlighting the significance of residue contacts.
  • Higher CVs were found between structure elements compared to linkers, indicating their role in intramolecular adhesion.

Conclusions:

  • The contact volume (CV) method provides an efficient computational approach to predict protein structure elements.
  • Intramolecular residue-residue contacts are critical for maintaining protein tertiary structure.
  • Protein structure elements function as essential "building blocks" that dictate and stabilize protein structures.