Effect of detergents on the thermal behavior of elastin-like polypeptides.

Journal Article (Journal Article)

Elastin-like polypeptide (ELP) fusions have been designed to allow large-scale, nonchromatographic purification of many soluble proteins by using the inverse transition cycling (ITC) method; however, the sensitivity of the aqueous lower critical solubility phase transition temperature (T(t)) of ELPs to the addition of cosolutes, including detergents, may be a potential hindrance in purification of proteins with surface hydrophobicity in such a manner. To identify detergents that are known to solubilize such proteins (e.g., membrane proteins) and that have little effect on the T(t) of the ELP, we screened a number of detergents with respect to their effects on the T(t) and secondary structures of a model ELP (denoted here as ELP180). We found that mild detergents (e.g., n-dodecyl-β-D-maltoside, Triton-X100, and 3-[(3-cholamidopropyl) dimethylamino]-1-propanesulfonate) do not alter the phase transition behavior or structure (as probed by circular dichroism) of ELP180. This result is in contrast to previous studies that showed a strong effect of other detergents (e.g., sodium dodecylsulfate) on the T(t) of ELPs. Our results clearly indicate that mild detergents do not preclude ITC-based separation of ELPs, and thus that ELP fusions may prove to be useful in the purification of detergent-solubilized recombinant hydrophobic proteins, including membrane proteins, which are otherwise notoriously difficult to extract and purify by conventional separation methods (e.g., chromatography).

Full Text

Duke Authors

Cited Authors

  • Thapa, A; Han, W; Simons, RH; Chilkoti, A; Chi, EY; López, GP

Published Date

  • January 2013

Published In

Volume / Issue

  • 99 / 1

Start / End Page

  • 55 - 62

PubMed ID

  • 23097230

Pubmed Central ID

  • PMC3481190

Electronic International Standard Serial Number (EISSN)

  • 1097-0282

International Standard Serial Number (ISSN)

  • 0006-3525

Digital Object Identifier (DOI)

  • 10.1002/bip.22137


  • eng