Prophenoloxidase Explained
Prophenoloxidase (proPO) is a modified form of the complement response found in some invertebrates, including insects, crabs and worms.[1] It is a copper-containing metalloprotein.[2]
A major innate defense system in invertebrates is the melanization of pathogens and damaged tissues. This important process is controlled by the enzyme phenoloxidase (PO).[3] The conversion of prophenoloxidase to the active form of the enzyme can be brought about by minuscule amounts of molecules such as lipopolysaccharide, peptidoglycan and beta-1,3-glucans from microorganisms.[4]
However, it still has many arguments in the innate immune function, especially in model invertebrate animal.[5] The proPO homologous-protein in mammal also does not have any immune activity. Thus, it might be difficult to conclude its function in immunity.
Notes and References
- Immunity and the Invertebrates. Scientific American. November 1996. 60–66. 10.1038/scientificamerican1196-60. Habicht. 275. 5. Beck. Gregory. Gail S.. 8875808. 1996SciAm.275e..60B.
- Sánchez-Aparicio. José-Emilio. Tiessler-Sala. Laura. Velasco-Carneros. Lorea. Roldán-Martín. Lorena. Sciortino. Giuseppe. Maréchal. Jean-Didier. 2021-01-25. BioMetAll: Identifying Metal-Binding Sites in Proteins from Backbone Preorganization. Journal of Chemical Information and Modeling. 61. 1. 311–323. 10.1021/acs.jcim.0c00827. 33337144 . 1549-9596. 10261/310255. free.
- 15199959. 2004. Cerenius. L. Söderhäll. K. The prophenoloxidase-activating system in invertebrates. 198. 116–26. Immunological Reviews. 10.1111/j.0105-2896.2004.00116.x. 10614298.
- 9523106. 1998. Söderhäll. K. Cerenius. L. Role of the prophenoloxidase-activating system in invertebrate immunity. 10. 1. 23–8. Current Opinion in Immunology. 10.1016/S0952-7915(98)80026-5.
- 1369246. 2006. Leclerc. V. Reichhart. JM. Prophenoloxidase activation is not required for survival to microbial infections in Drosophila. 7. 2. 231–5. EMBO Rep. 10.1038/sj.embor.7400592. 16322759.