Effect of Phenol on the Activity and Temperature Characteristics of Peptidases in Chironomid Larvae at Different рН Values

Autor: E. Yu. Chornaya, V. A. Sheptitskiy, V. V. Kuz’mina
Rok vydání: 2021
Předmět:
Zdroj: Inland Water Biology. 14:231-238
ISSN: 1995-0837
1995-0829
DOI: 10.1134/s1995082921020097
Popis: The effect of phenol (Ph, 0.25 mmol/L) on the activity and temperature dependence of casein- and hemoglobin-lytic peptidases functioning in the whole organism of chironomid larvae Chironomus sp. within the temperature range of 0−70°С at different рН values (3.0, 5.0, and 7.4) is studied. The temperature optimum of the studied peptidases of chironomid larvae corresponds to 40°С. Under the influence of phenol, the activity of casein-lytic peptidases increases more significantly at 20°С and рН 5.0 (by a factor of 3.3) and that of hemoglobin-lytic peptidases increases more significantly at рН 3.0 (by a factor of 3.5). The effect successively decreases from рН 3.0 up to рН 7.4. under both temperatures. In the presence of phenol, the shape of the curves of the temperature dependence and the Q10 values transform most significantly in the zone of high temperatures. The values of activation energy (Eact) of the process of hydrolysis of casein and hemoglobin-lytic peptidases in the zone of low and high temperatures are different. In the presence of phenol, Eact values of the process of hydrolysis of casein casein-lytic peptidases at рН 7.4 increase; at рН 5.0 they decreases in the zone of high temperatures. The values of Eact of the process of hydrolysis of hemoglobin-lytic peptidases decrease in most cases. The mechanisms of the influence of phenol on peptidase activity and digestive processes in benthivorous fish feeding on chironomid larvae are discussed.
Databáze: OpenAIRE
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