Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 37-45 |
| Number of pages | 9 |
| Journal | Journal of Inorganic Biochemistry |
| Volume | 121 |
| DOIs | |
| Publication status | Published - 2013 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- c-terminal domain
- fungal tyrosinase
- protein processing
- proteolytic activation
- sensitivity to proteolysis
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Experimental and bioinformatic investigation of the proteolytic degradation of the C-terminal domain of a fungal tyrosinase. / Faccio, G. (Corresponding Author); Arvas, Mikko; Thöny-Meyer, L.; Saloheimo, Markku.
In: Journal of Inorganic Biochemistry, Vol. 121, 2013, p. 37-45.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Experimental and bioinformatic investigation of the proteolytic degradation of the C-terminal domain of a fungal tyrosinase
AU - Faccio, G.
AU - Arvas, Mikko
AU - Thöny-Meyer, L.
AU - Saloheimo, Markku
PY - 2013
Y1 - 2013
N2 - Proteolytic processing is a key step in the production of polyphenol oxidases such as tyrosinases, converting the inactive proenzyme to an active form. In general, the fungal tyrosinase gene codes for a ~ 60 kDa protein that is, however, isolated as an active enzyme of ~ 40 kDa, lacking the C-terminal domain. Using the secreted tyrosinase 2 from Trichoderma reesei as a model protein, we performed a mutagenesis study of the residues in proximity of the experimentally determined cleavage site which are possibly involved in the proteolytic process. However, the mutant forms of tyrosinase 2 were not secreted in a full-length form retaining the C-terminal domain, but they were processed to give a ~ 45 kDa active form. Aiming at explaining this phenomenon, we analysed in silico the properties of the C-terminal domain of tyrosinase 2, of 23 previously retrieved homologous tyrosinase sequences from fungi (C. Gasparetti, G. Faccio, M. Arvas, J. Buchert, M. Saloheimo, K. Kruus, Appl. Microbiol. Biotechnol. 86 (2010) 213–226) and of nine well-characterised polyphenol oxidases. Based on the results of our study, we exclude the key role of specific amino acids at the cleavage site in the proteolytic process and report an overall higher sensitivity to proteolysis of the linker region and of the whole C-terminal domain of fungal tyrosinases.
AB - Proteolytic processing is a key step in the production of polyphenol oxidases such as tyrosinases, converting the inactive proenzyme to an active form. In general, the fungal tyrosinase gene codes for a ~ 60 kDa protein that is, however, isolated as an active enzyme of ~ 40 kDa, lacking the C-terminal domain. Using the secreted tyrosinase 2 from Trichoderma reesei as a model protein, we performed a mutagenesis study of the residues in proximity of the experimentally determined cleavage site which are possibly involved in the proteolytic process. However, the mutant forms of tyrosinase 2 were not secreted in a full-length form retaining the C-terminal domain, but they were processed to give a ~ 45 kDa active form. Aiming at explaining this phenomenon, we analysed in silico the properties of the C-terminal domain of tyrosinase 2, of 23 previously retrieved homologous tyrosinase sequences from fungi (C. Gasparetti, G. Faccio, M. Arvas, J. Buchert, M. Saloheimo, K. Kruus, Appl. Microbiol. Biotechnol. 86 (2010) 213–226) and of nine well-characterised polyphenol oxidases. Based on the results of our study, we exclude the key role of specific amino acids at the cleavage site in the proteolytic process and report an overall higher sensitivity to proteolysis of the linker region and of the whole C-terminal domain of fungal tyrosinases.
KW - c-terminal domain
KW - fungal tyrosinase
KW - protein processing
KW - proteolytic activation
KW - sensitivity to proteolysis
U2 - 10.1016/j.jinorgbio.2012.12.006
DO - 10.1016/j.jinorgbio.2012.12.006
M3 - Article
VL - 121
SP - 37
EP - 45
JO - Journal of Inorganic Biochemistry
JF - Journal of Inorganic Biochemistry
SN - 0162-0134
ER -