Prophenoloxidase activating system in insect hemolymph.
نویسندگان
چکیده
منابع مشابه
The ascidian prophenoloxidase activating system
Phenoloxidases/tyrosinases initiate melanin synthesis in almost all organisms, and are involved in different biological activities such as the colour change of human hair and the browning or blackening of fruit skin etc. In many invertebrates, defence reactions are linked to phenoloxidase activity and/or melanization. Contacts with foreign molecules are able to trigger the prophenoloxidase (pro...
متن کاملManduca sexta hemolymph proteinase 21 activates prophenoloxidase-activating proteinase 3 in an insect innate immune response proteinase cascade.
Melanization, an insect immune response, requires a set of hemolymph proteins including pathogen recognition proteins that initiate the response, a cascade of mostly unknown serine proteinases, and phenoloxidase. Until now, only initial and final proteinases in the pathways have been conclusively identified. Four such proteinases have been purified from the larval hemolymph of Manduca sexta: he...
متن کاملStudy of prophenoloxidase activating system of freshwater crayfish (Pontastacus leptodactylus)
Phenoloxidase (Po) activity was measusred spectrophotometrically in serum, plasma and haemocytes (HLS) of the freshwater crayfish (Pontastacus leptodactylus). The highest activity was found in HLS suggesting that the haemocytes are the major source of the Po or its proform prophenoloxidase (proPO) in crayfish. Furthermore, the enzyme activity in serum samples was reduced after freezing the samp...
متن کاملStudy of prophenoloxidase activating system of freshwater crayfish (Pontastacus leptodactylus)
Phenoloxidase (Po) activity was measusred spectrophotometrically in serum, plasma and haemocytes (HLS) of the freshwater crayfish (Pontastacus leptodactylus). The highest activity was found in HLS suggesting that the haemocytes are the major source of the Po or its proform prophenoloxidase (proPO) in crayfish. Furthermore, the enzyme activity in serum samples was reduced after freezing the samp...
متن کاملA silkworm hemolymph protein is a prophenoloxidase activation blocker
Melanization in insect hemolymph is triggered by the recognition of pathogen-associated molecular patterns via pattern recognition receptors. The signal transduction leads to the activation of the prophenoloxidase and hence the generation of melanin. The proPO activation process must be tightly controlled to minimize the host damage caused by reactive intermediates during melanin synthesis. The...
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ژورنال
عنوان ژورنال: Kagaku To Seibutsu
سال: 1988
ISSN: 0453-073X,1883-6852
DOI: 10.1271/kagakutoseibutsu1962.26.425