Protein growth rate in rainbow trout (Oncorhynchus mykiss) is negatively correlated to liver 20S proteasome activity.
Comp Biochem Physiol A Mol Integr Physiol
; 137(1): 75-85, 2004 Jan.
Article
em En
| MEDLINE
| ID: mdl-14720593
ABSTRACT
The efficiency with which fish and other animals add and maintain body proteins is a balance between synthesis of proteins and their degradation. In fish that have similar food consumption and protein synthesis rates, a greater ratio of synthesis to degradation would be expected to produce more efficient conversion of food into growth. In addition, we hypothesised that high activities of the proteasome, a major pathway of protein degradation, would be negatively correlated with growth rate. In order to test this hypothesis we maintained rainbow trout for 62 days, during which repeat measurements of food consumption and growth were made. We selected fish for high and low growth efficiencies. Protein degradation was estimated from the difference between protein synthesis (determined by 15N flux) and protein growth. We found that protein synthesis rates were significantly higher in the low growth efficiency group, as were estimated protein degradation rates. In another group of fish that also did not differ in food consumption, the activity of the proteasome in the liver, but not in the muscle, was negatively correlated with growth rates. These two experiments showed that high proteasome activity is linked to decreased growth efficiency.
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Base de dados:
MEDLINE
Assunto principal:
Cisteína Endopeptidases
/
Oncorhynchus mykiss
/
Proteínas de Peixes
/
Fígado
/
Complexos Multienzimáticos
Limite:
Animals
Idioma:
En
Revista:
Comp Biochem Physiol A Mol Integr Physiol
Assunto da revista:
BIOLOGIA MOLECULAR
/
FISIOLOGIA
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Reino Unido