Influence of protic ionic liquids on the structure and stability of succinylated Con A

Pankaj Attri, Pannuru Venkatesu

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38 Citations (Scopus)


We report the synthesis of a series of ionic liquids (ILs) from various ions having different kosmotropicity including dihydrogen phosphate (H2PO4-), hydrogen sulfate (HSO4-) and acetate (CH3COO-) as anions and chaotropic cation such as trialkylammonium cation. To characterize the biomolecular interactions of ILs with protein, we have explored the stability of succinylated Con A (S Con A) in the presence of these aqueous ILs, which are varied combinations of kosmotropic anion with chaotropic cation such as triethylammonium dihydrogen phosphate [(CH3CH2)3NH][H2PO4] (TEAP), trimethylammonium acetate [(CH3)3NH][CH3COO] (TMAA), trimethylammonium dihydrogen phosphate [(CH3)3NH][H2PO4] (TMAP) and trimethylammonium hydrogen sulfate [(CH3)3NH][HSO4] (TMAS). Circular dichroism (CD) and fluorescence experiments have been used to characterize the stability of S Con A by ILs. Our data distinctly demonstrate that the long alkyl chain IL TEAP is a strong stabilizer for S Con A. Further, our experimental results reveal that TEAP is an effective refolding enhancer for S Con A from a thermally denatured protein structure.

Original languageEnglish
Pages (from-to)119-128
Number of pages10
JournalInternational Journal of Biological Macromolecules
Issue number1-2
Publication statusPublished - Jul 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Economics and Econometrics
  • General Energy


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