Thermal-aggregation suppression of proteins by a structured PEG analogue: Importance of denaturation temperature for effective aggregation suppression

Takahiro Muraoka, Nabanita Sadhukhan, Mihoko Ui, Shunichi Kawasaki, Enrikko Hazemi, Kota Adachi, Kazushi Kinbara

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Development of protein stabilizing reagents, that suppress aggregation and assist refolding, is an important issue in biochemical technology related with the synthesis and preservation of therapeutic or other functional proteins. In the precedent research, we have developed a structured poly(ethylene glycol) (PEG) analogue with triangular geometry, which turns into a dehydrated state above ca. 60. °C. Focusing on this rather lower dehydration temperature than that of conventional linear PEGs, a capability of the triangle-PEG to stabilize proteins under thermal stimuli was studied for citrate synthase, carbonic anhydrase, lysozyme and phospholipase. Variable temperature high-tension voltage and circular dichroism spectroscopic studies on the mixtures of these proteins and the triangle-PEG showed that the triangle-PEG stabilizes carbonic anhydrase, lysozyme and phospholipase that exhibit denaturation temperatures higher than 60. °C, while substantially no stabilization was observed for citrate synthase that denatures below 60. °C. Hence, the dehydrated triangle-PEG likely interacts with partially unfolded proteins through the hydrophobic interaction to suppress protein aggregation.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalBiochemical Engineering Journal
Volume86
DOIs
Publication statusPublished - 2014 May 15

Keywords

  • Aggregation
  • Circular dichroism spectroscopy
  • High-tension voltage analysis
  • Poly(ethylene glycol)
  • Protein denaturation
  • Refolding

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Bioengineering
  • Biomedical Engineering

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