Self-assembly of class II hydrophobins on polar surfaces

Mathias S. Grunér, Geza Szilvay, Mattias Berglin, Michael Lienemann, Päivi Laaksonen, Markus Linder

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Hydrophobins are structural proteins produced by filamentous fungi that are amphiphilic and function through self-assembling into structures such as membranes. They have diverse roles in the growth and development of fungi, for example in adhesion to substrates, for reducing surface tension to allow aerial growth, in forming protective coatings on spores and other structures. Hydrophobin membranes at the air–water interface and on hydrophobic solids are well studied, but understanding how hydrophobins can bind to a polar surface to make it more hydrophobic has remained unresolved. Here we have studied different class II hydrophobins for their ability to bind to polar surfaces that were immersed in buffer solution. We show here that the binding under some conditions results in a significant increase of water contact angle (WCA) on some surfaces. The highest contact angles were obtained on cationic surfaces where the hydrophobin HFBI has an average WCA of 62.6° at pH 9.0, HFBII an average of 69.0° at pH 8.0, and HFBIII had an average WCA of 61.9° at pH 8.0. The binding of the hydrophobins to the positively charged surface was shown to depend on both pH and ionic strength. The results are significant for understanding the mechanism for formation of structures such as the surface of mycelia or fungal spore coatings as well as for possible technical applications.
Original languageEnglish
Pages (from-to)4293-4300
JournalLangmuir
Volume28
Issue number9
DOIs
Publication statusPublished - 9 Feb 2012
MoE publication typeA1 Journal article-refereed

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Self assembly
self assembly
Contact angle
spores
fungi
Fungi
Water
water
membranes
Membranes
protective coatings
Protective coatings
assembling
Ionic strength
Surface tension
Buffers
interfacial tension
adhesion
Adhesion
buffers

Cite this

Grunér, M. S., Szilvay, G., Berglin, M., Lienemann, M., Laaksonen, P., & Linder, M. (2012). Self-assembly of class II hydrophobins on polar surfaces. Langmuir, 28(9), 4293-4300. https://doi.org/10.1021/la300501u
Grunér, Mathias S. ; Szilvay, Geza ; Berglin, Mattias ; Lienemann, Michael ; Laaksonen, Päivi ; Linder, Markus. / Self-assembly of class II hydrophobins on polar surfaces. In: Langmuir. 2012 ; Vol. 28, No. 9. pp. 4293-4300.
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Grunér, MS, Szilvay, G, Berglin, M, Lienemann, M, Laaksonen, P & Linder, M 2012, 'Self-assembly of class II hydrophobins on polar surfaces', Langmuir, vol. 28, no. 9, pp. 4293-4300. https://doi.org/10.1021/la300501u

Self-assembly of class II hydrophobins on polar surfaces. / Grunér, Mathias S.; Szilvay, Geza; Berglin, Mattias; Lienemann, Michael; Laaksonen, Päivi; Linder, Markus.

In: Langmuir, Vol. 28, No. 9, 09.02.2012, p. 4293-4300.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Grunér, Mathias S.

AU - Szilvay, Geza

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AU - Linder, Markus

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AB - Hydrophobins are structural proteins produced by filamentous fungi that are amphiphilic and function through self-assembling into structures such as membranes. They have diverse roles in the growth and development of fungi, for example in adhesion to substrates, for reducing surface tension to allow aerial growth, in forming protective coatings on spores and other structures. Hydrophobin membranes at the air–water interface and on hydrophobic solids are well studied, but understanding how hydrophobins can bind to a polar surface to make it more hydrophobic has remained unresolved. Here we have studied different class II hydrophobins for their ability to bind to polar surfaces that were immersed in buffer solution. We show here that the binding under some conditions results in a significant increase of water contact angle (WCA) on some surfaces. The highest contact angles were obtained on cationic surfaces where the hydrophobin HFBI has an average WCA of 62.6° at pH 9.0, HFBII an average of 69.0° at pH 8.0, and HFBIII had an average WCA of 61.9° at pH 8.0. The binding of the hydrophobins to the positively charged surface was shown to depend on both pH and ionic strength. The results are significant for understanding the mechanism for formation of structures such as the surface of mycelia or fungal spore coatings as well as for possible technical applications.

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