Reference : Caractères et évolution des enzymes chitinolytiques chez les vertébrés inférieurs
Scientific journals : Article
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/192847
Caractères et évolution des enzymes chitinolytiques chez les vertébrés inférieurs
French
Jeuniaux, Charles [Université de Liège - ULiège > Institut Van Beneden > Laboratoires de morphologie, systématique et écologie animales > >]
Dandrifosse, Guy mailto [Université de Liège > > Relations académiques et scientifiques (Médecine) >]
Micha, J.C. [Université de Liège - ULiège > Institut Van Beneden > Laboratoires de morphologie, systématique et écologie animales > >]
1982
Biochemical Systematics and Ecology
Pergamon Press - An Imprint of Elsevier Science
10
4
365-372
Yes (verified by ORBi)
International
0305-1978
[en] fish ; Amphibia ; Reptilia ; chitinases ; digestive systems ; evolution
[fr] poisson ; amphibie ; reptile ; chitine ; système digestif ; évolution
[en] The activity of chitinases extracted from various organs of different fish, amphibians and reptiles was estimated as a function of pH by using "native" chitin as substrate. Three types of chitinase activity were recorded, suggesting the existence of three different chitinase types : Type I : (optimum pH : 4.5, no activity at pH 1.0) was found in various organs, such as intestine, pyloric caeca, pancreas, liver, spleen, etc.) ; Type IIa : (optimum pH : 3.0, weak activity at pH 1.0) was obtained from the gastric mucosa of fish and one species of urodele ; Type IIb : (otimum pH : 3.0, strong activity at pH 1.0) was found in the gastric mucosa of reptiles and batrachian anura. Chitinase activity appears to be adapted to the pH of the digestive fluids. A tentative scheme is presented of chitinase evolution among lower vertebrates.
Researchers
http://hdl.handle.net/2268/192847

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