Melanin production by tyrosinase activity on a tyrosine-rich peptide fragment and pH-dependent self-assembly of its lipidated analogue

Jessica A. Hutchinson, Ian W. Hamley*, Charlotte J.C. Edwards-Gayle, Valeria Castelletto, Cristian Piras, Rainer Cramer, Radoslaw Kowalczyk, Jani Seitsonen, Janne Ruokolainen, Robert P. Rambo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

We investigate the self-assembly of a palmitoylated (C 16 -chain at the N terminus) peptide fragment in comparison to the unlipidated peptide EELNRYY, a fragment of the gut hormone peptide PYY 3-36 . The lipopeptide C 16 -EELNRYY shows remarkable pH-dependent self-assembly above measured critical aggregation concentrations, forming fibrils at pH 7, but micelles at pH 10. The parent peptide does not show self-assembly behaviour. The lipopeptide forms hydrogels at sufficiently high concentration at pH 7, the dynamic mechanical properties of which were measured. We also show that the tyrosine functionality at the C terminus of EELNRYY can be used to enzymatically produce the pigment melanin. The enzyme tyrosinase oxidises tyrosine into 3,4-dihydroxyphenylalanine (DOPA), DOPA-quinone and further products, eventually forming eumelanin. This is a mechanism of photo-protection in the skin, for this reason controlling tyrosinase activity is a major target for skin care applications and EELNRYY has potential to be developed for such uses.

Original languageEnglish
Pages (from-to)4543-4553
Number of pages11
JournalORGANIC AND BIOMOLECULAR CHEMISTRY
Volume17
Issue number18
DOIs
Publication statusPublished - 14 May 2019
MoE publication typeA1 Journal article-refereed

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    Hutchinson, J. A., Hamley, I. W., Edwards-Gayle, C. J. C., Castelletto, V., Piras, C., Cramer, R., ... Rambo, R. P. (2019). Melanin production by tyrosinase activity on a tyrosine-rich peptide fragment and pH-dependent self-assembly of its lipidated analogue. ORGANIC AND BIOMOLECULAR CHEMISTRY, 17(18), 4543-4553. https://doi.org/10.1039/c9ob00550a