The changing face of SDS denaturation: Complexes of Thermomyces lanuginosus lipase with SDS at pH 4.0, 6.0 and 8.0
| Autor: | Helena Østergaard Rasmussen, Daniel T. Weltz Wollenberg, Huabing Wang, Kell K. Andersen, Cristiano L.P. Oliveira, Christian Isak Jørgensen, Thomas J.D. Jørgensen, Daniel E. Otzen, Jan Skov Pedersen |
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| Rok vydání: | 2022 |
| Předmět: |
Lipase/chemistry
Eurotiales Lipase SAXS Hydrogen-Ion Concentration PROTEÍNAS DA MEMBRANA Eurotiales/enzymology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Denaturation Colloid and Surface Chemistry Ascomycota X-Ray Diffraction Scattering Small Angle Ascomycota/chemistry HDX-MS SDS |
| Zdroj: | Rasmussen, H Ø, Wollenberg, D T W, Wang, H, Andersen, K K, Oliveira, C L P, Jørgensen, C I, Jørgensen, T J D, Otzen, D E & Pedersen, J S 2022, ' The changing face of SDS denaturation : Complexes of Thermomyces lanuginosus lipase with SDS at pH 4.0, 6.0 and 8.0 ', Journal of Colloid and Interface Science, vol. 614, pp. 214-232 . https://doi.org/10.1016/j.jcis.2021.12.188 Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0021-9797 |
| Popis: | HYPOTHESIS: Lipases are widely used in the detergent industry and must withstand harsh conditions involving both anionic and zwitterionic surfactants at alkaline pH. Thermomyces lanuginosus lipase (TlL) is often used and stays active at high concentrations of the anionic surfactant sodium dodecyl sulfate (SDS) at pH 8.0, but is sensitive to SDS at pH 6.0 and below. We propose that enhanced stability at pH 8.0 results from a structurally distinct complex formation with SDS.EXPERIMENTS: We use small-angle X-ray scattering (SAXS) to elucidate structures of TlL:SDS at pH 4.0, 6.0, and 8.0 and further investigate the complexes at pH 8.0 using hydrogen/deuterium exchange mass spectrometry (HDX-MS).FINDINGS: At pH 4.0, large dense aggregates are formed at low [SDS], which become gradually less dense at higher [SDS], resulting in a core-shell structure. At pH 6.0, SDS induces a TlL dimer and forms a hemi-micelle along the side of the dimer. At higher [SDS], TlL adopts a core-shell structure. At pH 8.0, TlL forms a dimer with a SDS hemi-micelle but avoids a core-shell structure and maintains activity. Three helices are identified as SDS anchor points. This study provides important structural insight into the stability of TlL towards SDS under alkaline conditions. |
| Databáze: | OpenAIRE |
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