Identification of Folding Intermediates of Streblin, The Most Stable Serine Protease: Biophysical Analysis

Streblin, a serine proteinase from plant Streblus asper, has been used to investigate the conformational changes induced by pH, temperature, and chaotropes. The near/far UV circular dichroism activities under fluorescence emission spectroscopy and 8-aniline-1-naphthalene sulfonate (ANS) binding have...

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Veröffentlicht in:Applied biochemistry and biotechnology 2014-01, Vol.172 (2), p.658-671
Hauptverfasser: Kumar, Reetesh, Tripathi, Pinki, de Moraes, Fabio Rogerio, Caruso, Ícaro P, Jagannadham, Medicherla V
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container_issue 2
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container_title Applied biochemistry and biotechnology
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creator Kumar, Reetesh
Tripathi, Pinki
de Moraes, Fabio Rogerio
Caruso, Ícaro P
Jagannadham, Medicherla V
description Streblin, a serine proteinase from plant Streblus asper, has been used to investigate the conformational changes induced by pH, temperature, and chaotropes. The near/far UV circular dichroism activities under fluorescence emission spectroscopy and 8-aniline-1-naphthalene sulfonate (ANS) binding have been carried out to understand the unfolding of the protein in the presence of denaturants. Spectroscopic studies reveal that streblin belongs to the α+β class of proteins and exhibits stability towards chemical denaturants, guanidine hydrochloride (GuHCl). The pH-induced transition of this protein is noncooperative for transition phases between pH 0.5 and 2.5 (midpoint, 1.5) and pH 2.5 and 10.0 (midpoint, 6.5). At pH 1.0 or lower, the protein unfolds to form acid-unfolded state, and for pH 7.5 and above, protein turns into an alkaline denatured state characterized by the absence of ANS binding. At pH 2.0 (1 M GuHCl), streblin exists in a partially unfolded state with characteristics of a molten globule state. The protein is found to exhibit strong and predominant ANS binding. In total, six different intermediate states has been identified to show protein folding pathways.
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subjects Biochemistry
Biological and medical sciences
Biophysical Phenomena
Biophysical Phenomena - drug effects
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Circular Dichroism
drug effects
Emission spectroscopy
Enzyme Stability
Enzyme Stability - drug effects
Flowers & plants
fluorescence emission spectroscopy
Fundamental and applied biological sciences. Psychology
Guanidine
Guanidine - pharmacology
Hydrogen-Ion Concentration
metabolism
Naphthalene
pharmacology
Proteases
Protein Denaturation
Protein Denaturation - drug effects
Protein folding
Protein Folding - drug effects
proteins
Serine Proteases
Serine Proteases - chemistry
Serine Proteases - metabolism
serine proteinases
Spectrometry, Fluorescence
Spectrophotometry, Ultraviolet
Streblus
Streblus asper
temperature
Thermodynamics
title Identification of Folding Intermediates of Streblin, The Most Stable Serine Protease: Biophysical Analysis
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