Thermodynamic prediction of structural determinants of the molten globule state of barnase

Research output: Contribution to journalArticle

Abstract

Recently, it has been demonstrated that the enthalpy and heat capacity changes for protein folding/unfolding can be predicted rather accurately from the crystallographic or NMR solution structure of a protein. (K.P. Murphy, V. Bhakuni, D. Xie and E. Freire, Mol. Biol. 227 (1992) 293-306.) Under some conditions proteins do not unfold completely, giving rise to states in which the molecule remains in a compact configuration after denaturation. These compact denatured or molten globule states retain a hydrophobic core, exhibit residual structure and a compactness close to that of the native state. This phenomenon is reflected in the thermodynamics of the process. By using the structural parametrization of the energetics, it is possible to develop an algorithm aimed at selecting partly folded states that conform to the experimental thermodynamic constraints of the molten globule. We have applied our molten globule search algorithm to the globular protein barnase. This approach has allowed a structure based selection of a unique family of structural states that satisfy the experimental criteria of the molten globule. The prediction of the molten globule search algorithm indicates that the first helix together with most of the β-sheet structure (β2,β3-5) and loop 5 constitute the main determinants of the molten globule intermediate, in agreement with the NMR data. These results open the prospect for an automated search of the structural determinants of the molten globule state of proteins and suggest that salvation parameters can be effectively used to probe structural states of proteins.

Original languageEnglish (US)
Pages (from-to)243-251
Number of pages9
JournalBiophysical Chemistry
Volume51
Issue number2-3
DOIs
StatePublished - 1994

Fingerprint

globules
Thermodynamics
determinants
Molten materials
thermodynamics
proteins
predictions
Proteins
Protein Unfolding
Protein Folding
Nuclear magnetic resonance
Protein folding
nuclear magnetic resonance
Denaturation
biopolymer denaturation
Hot Temperature
void ratio
Bacillus amyloliquefaciens ribonuclease
helices
folding

Keywords

  • Molten globule state
  • Proteins
  • Structural determinants

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Physical and Theoretical Chemistry

Cite this

Thermodynamic prediction of structural determinants of the molten globule state of barnase. / Freire, Ernesto I; Xie, Dong.

In: Biophysical Chemistry, Vol. 51, No. 2-3, 1994, p. 243-251.

Research output: Contribution to journalArticle

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