Biosynthesis of an amphiphilic silk-like polymer

M.W.T. Werten, A.P.H.A. Moers, Tu Ha Vong, H. Zuilhof, J.C.M. Hest, van, F.A. de Wolf

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

34 Citaten (Scopus)

Samenvatting

An amphiphilic silk-like protein polymer was efficiently produced in the yeast Pichia pastoris. The secreted product was fully intact and was purified by solubilization in formic acid and subsequent precipitation of denatured host proteins upon dilution with water. In aqueous alkaline solution, the negatively charged acidic polymer assumed extended helical (silk III-like) and unordered conformations. Upon subsequent drying, it assumed a conformation rich in β-turns. In water at low pH, the uncharged polymer aggregated and the solution became turbid. Concentrated solutions in 70% (v/v) formic acid slowly formed gels. Replacement of the formic acid-water mixture with methanol and subsequent drying resulted in β-sheets, which stacked into fibril-like structures. The novel polymer instantaneously lowered the air-water interfacial tension under neutral to alkaline conditions and reversed the polarity of hydrophobic and hydrophilic solid surfaces upon adsorption.

Originele taal-2Engels
Pagina's (van-tot)1705-1711
Aantal pagina's7
TijdschriftBiomacromolecules
Volume9
Nummer van het tijdschrift7
DOI's
StatusGepubliceerd - jul 2008
Extern gepubliceerdJa

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