Abstract
The prophenoloxidase cascade represents one of the most important defense mechanisms in many invertebrates. Following the recognition of microbial saccharides by pattern recognition molecules, proteinases cleave inactive prophenoloxidase to its active form, phenoloxidase. Phenoloxidase is a key enzyme responsible for the catalysis of the melanization reaction. Final product melanin is involved in wound healing and immune responses. Prophenoloxidase cascade has been widely described in arthropods; data in other invertebrate groups are less frequent. Here we show detectable phenoloxidase activity in 90-kDa fraction of the coelomic fluid of earthworms Eisenia fetida. Amino acid sequencing of peptides from the active fraction revealed a partial homology with invertebrate phenoloxidases and hemocyanins. Moreover, the level of phenoloxidase activity is lower and the activation slower as compared to other invertebrates.
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Abbreviations
- CF:
-
Coelomic fluid
- LBSS:
-
Lumbricus balanced salt solution
- PBS:
-
Phosphate buffered solution
- proPO:
-
Prophenoloxidase
- PO:
-
Phenoloxidase
- l-DOPA:
-
l-β-3,4-Dihydroxyphenylalanine
- ppA:
-
Prophenoloxidase-activating enzyme
- CPC:
-
Cetylpyridium chloride
- Hc:
-
Hemocyanin
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Acknowledgements
This work was supported by the Czech Science Foundation (310/04/0806; B500200613), Institutional Research Concept (AVOZ50200510) and a bilateral international scientific and technological cooperation grant of the Ministry of the Flemish Community (BOF-BWS 03/06) and was performed within the frames of an Interuniversity Attraction Pole Program. Authors are grateful to Prof. Söderhäll, Uppsala, for providing probe containing the gene coding for PO in crayfish P. leniusculus. All experiments comply with the current laws of the Czech Republic and Belgium.
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Procházková, P., Šilerová, M., Stijlemans, B. et al. Evidence for proteins involved in prophenoloxidase cascade Eisenia fetida earthworms. J Comp Physiol B 176, 581–587 (2006). https://doi.org/10.1007/s00360-006-0081-z
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DOI: https://doi.org/10.1007/s00360-006-0081-z