The Protein Journal

, Volume 29, Issue 7, pp 501–508 | Cite as

Heat, pH Induced Aggregation and Surface Hydrophobicity of S. cerevesiae Ssa1 Protein

  • Yusuf Tutar
  • Derya Arslan
  • Lütfi Tutar


Heat shock protein 70 is a conserved protein among organisms. Hsp70 helps substrate proteins to fold correctly. Unfolded substrate proteins increase the probability of the aggregate formation. High level recombinant protein expression in biotechnology often leads insoluble inclusion bodies. To prevent aggregation and to obtain high levels of soluble proteins, Hsp co-expression with desired recombinant protein in yeast becomes a popular method. For this purpose, S. cerevesiae cytosolic Hsp70 (Ssa1) biochemical properties were characterized. Alteration of Ssa1 structure between ATP- and ADP-bound states regulates its function. Therefore, conformation-dependent Ssa1 hydrophobicity and as a result aggregation may also play a key role in Ssa1 function. Therefore, a combination of FTIR, acrylamide quenching, and ANS was used to investigate the effect of nucleotide binding on the structure of Ssa1. Ssa1 secondary structure alterations and hydrophobic properties in aqueous solutions with differing ionic strengths and temperature were also studied.


Ssa1 Aggregation Spectroscopy 



Heat shock protein


Fourier transform infrared spectroscopy


8-Anilino-2-naphthyl sulfonic acid



This work was funded partly by the Turkish Planning Organization (Grant DPT-K.120220-2006) and through seed grants from the Turkish National Academy of Sciences (TUBA-GEBIP) and from Cumhuriyet University Graduate School for Derya Arslan.


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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of Biochemistry, Faculty of MedicineCumhuriyet UniversitySivasTurkey
  2. 2.Department of Chemistry, Faculty of ScienceCumhuriyet UniversitySivasTurkey
  3. 3.Department of Biology, Faculty of ScienceAnkara UniversityAnkaraTurkey

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