title: Humoral defence factors in Indian river prawn, Macrobrachium malcolmsonii.
abstract: A preliminary study on humoral defence factors of Indian river prawn, Macrobrachium malcolmsonii was carried out. The serum of animals collected from intermoult stage had an average total protein content of 9.65 g dl(-1) and lysozyme-like activity of 0.04 unit ml(-1). The phenoloxidase activity in haemocyte lysate supernatant was triggered significantly (P < 0.05) by chitosan, Gram-positive and Gram-negative bacterial cells in comparison to other elicitors viz., levamisole, trypsin and glucan. The serum contained an agglutinin against Gram-negative bacteria and a haemagglutinin against a wide range of vertebrate erythrocytes. The haemagglutinin was stable over a wide range of pH (3.0-7.0) and temperatures (-30 degrees C to 60 degrees C). A 413 kDa N-acetyl galactosamine-specific haemagglutinin was purified by single step affinity chromatography and the protein was found to be calcium ion-dependent in nature and made up of five different subunits of varied molecular weights on denaturing SDS-PAGE.
authors.affiliation: Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar 751 002, India.
authors.forename: S
authors.initials: S
authors.lastname: Acharya
authors.forename: J
authors.initials: J
authors.lastname: Mohanty
authors.forename: P K
authors.initials: PK
authors.lastname: Sahoo
mesh_terms: D000373:Agglutinins / Q000276:immunology; D000818:Animals; D001419:Bacteria / Q000276:immunology; D002686:Chitin / Q000031:analogs & derivatives* / Q000276:immunology; D048271:Chitosan; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D006388:Hemagglutinins / Q000276:immunology; D006434:Hemocytes / Q000276:immunology; D006863:Hydrogen-Ion Concentration; D007113:Immunity, Innate / Q000276:immunology*; D014442:Monophenol Monooxygenase / Q000276:immunology; D009113:Muramidase / Q000276:immunology; D033541:Palaemonidae / Q000276:immunology*; D034781:Receptors, N-Acetylglucosamine / Q000302:isolation & purification*; D044967:Serum / Q000276:immunology*; D013696:Temperature
chemical_list: D000373:Agglutinins; D006388:Hemagglutinins; D034781:Receptors, N-Acetylglucosamine; D002686:Chitin; D048271:Chitosan; D014442:Monophenol Monooxygenase; D009113:Muramidase