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PfaH2: A novel hydrophobin from the ascomycete Paecilomyces farinosus
Author(s) -
Zelena Katerina,
Takenberg Meike,
Lunkenbein Stefan,
Woche Susanne K.,
Nimtz Manfred,
Berger Ralf G.
Publication year - 2013
Publication title -
biotechnology and applied biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 70
eISSN - 1470-8744
pISSN - 0885-4513
DOI - 10.1002/bab.1077
Subject(s) - hydrophobin , paecilomyces , complementary dna , amino acid , peptide sequence , biology , chemistry , chromatography , biochemistry , gene , botany
Abstract The pfah2 gene coding for a novel hydrophobin PfaH2 from the ascomycete Paecilomyces farinosus was identified during sequencing of random clones from a cDNA library. The corresponding protein sequence of PfaH2 deduced from the cDNA comprised 134 amino acids (aa). A 16 aa signal sequence preceded the N‐terminus of the mature protein. PfaH2 belonged to the class Ia hydrophobins. The protein was isolated using trifluoroacetic acid extraction and purified via SDS‐PAGE and high‐performance liquid chromatography. The surface activity of the recently described PfaH1 and of PfaH2 was compared by the determination of contact angles (CAs) on glass slides and Teflon tape, and the CA of distilled water droplets was measured on glass slides coated with hydrophobin PfaH1 or PfaH2. Surprisingly, both hydrophobins adsorbed to hydrophilic surfaces and changed their physicochemical properties to a similar quantitative extent, although little aa sequence homology was found.