Prophenoloxidase - Misplaced Pages

Prophenoloxidase b hexamer, Marsupenaeus japonicus.

Prophenoloxidase (proPO) is a modified form of the complement response found in some invertebrates, including insects, crabs and worms. It is a copper-containing metalloprotein.

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). 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.

However, it still has many arguments in the innate immune function, especially in model invertebrate animal. The proPO homologous-protein in mammal also does not have any immune activity. Thus, it might be difficult to conclude its function in immunity.

References

Beck, Gregory; Habicht, Gail S. (November 1996). "Immunity and the Invertebrates" (PDF). Scientific American. 275 (5): 60–66. Bibcode:1996SciAm.275e..60B. doi:10.1038/scientificamerican1196-60. PMID 8875808.
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. doi:10.1021/acs.jcim.0c00827. hdl:10261/310255. ISSN 1549-9596. PMID 33337144.
Cerenius, L; Söderhäll, K (2004). "The prophenoloxidase-activating system in invertebrates". Immunological Reviews. 198: 116–26. doi:10.1111/j.0105-2896.2004.00116.x. PMID 15199959. S2CID 10614298.
Söderhäll, K; Cerenius, L (1998). "Role of the prophenoloxidase-activating system in invertebrate immunity". Current Opinion in Immunology. 10 (1): 23–8. doi:10.1016/S0952-7915(98)80026-5. PMID 9523106.
Leclerc, V; Reichhart, JM (2006). "Prophenoloxidase activation is not required for survival to microbial infections in Drosophila". EMBO Rep. 7 (2): 231–5. doi:10.1038/sj.embor.7400592. PMC 1369246. PMID 16322759.

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)

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