Probing the folding-unfolding transition of a thermophilic protein, MTH1880

Heeyoun Kim, Sangyeol Kim, Youngjin Jung, Jeongmin Han, Ji Hye Yun, Iksoo Chang, Weon Tae Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The folding mechanism of typical proteins has been studied widely, while our understanding of the origin of the high stability of thermophilic proteins is still elusive. Of particular interest is how an atypical thermophilic protein with a novel fold maintains its structure and stability under extreme conditions. Folding-unfolding transitions of MTH1880, a thermophilic protein from Methanobacterium thermoautotrophicum, induced by heat, urea, and GdnHCl, were investigated using spectroscopic techniques including circular dichorism, fluorescence, NMR combined with molecular dynamics (MD) simulations. Our results suggest that MTH1880 undergoes a two-state N to D transition and it is extremely stable against temperature and denaturants. The reversibility of refolding was confirmed by spectroscopic methods and size exclusion chromatography. We found that the hyper-stability of the thermophilic MTH1880 protein originates from an extensive network of both electrostatic and hydrophobic interactions coordinated by the central β-sheet. Spectroscopic measurements, in combination with computational simulations, have helped to clarify the thermodynamic and structural basis for hyper-stability of the novel thermophilic protein MTH1880.

Original languageEnglish
Article numbere0145853
JournalPLoS One
Volume11
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Proteins
proteins
Methanobacterium
Protein Stability
Molecular Dynamics Simulation
Static Electricity
Hydrophobic and Hydrophilic Interactions
Thermodynamics
electrostatic interactions
Size exclusion chromatography
molecular dynamics
hydrophobic bonding
Gel Chromatography
Urea
thermodynamics
Hot Temperature
Fluorescence
Molecular dynamics
Electrostatics
urea

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Kim, Heeyoun ; Kim, Sangyeol ; Jung, Youngjin ; Han, Jeongmin ; Yun, Ji Hye ; Chang, Iksoo ; Lee, Weon Tae. / Probing the folding-unfolding transition of a thermophilic protein, MTH1880. In: PLoS One. 2016 ; Vol. 11, No. 1.
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Probing the folding-unfolding transition of a thermophilic protein, MTH1880. / Kim, Heeyoun; Kim, Sangyeol; Jung, Youngjin; Han, Jeongmin; Yun, Ji Hye; Chang, Iksoo; Lee, Weon Tae.

In: PLoS One, Vol. 11, No. 1, e0145853, 01.01.2016.

Research output: Contribution to journalArticle

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