N-acetyl-ß-d-glucosaminidase activity in Palaemon serratus - Methodological optimisation and intrinsic variability.
Comp Biochem Physiol A Mol Integr Physiol
; 256: 110932, 2021 06.
Article
in En
| MEDLINE
| ID: mdl-33677047
ABSTRACT
Chitinolytic enzymes fulfil a key role in the moulting process of crustaceans, in degrading the endocuticle during apolysis. Measuring the enzyme activity is an interesting manner to monitor the moult process at sub-individual level, complementary to the classical observation of the integument morphogenesis, ecdysis success, or moult cycle duration. The present study aimed to optimise the methodology of using N-acetyl-ß-D-glucosaminidase (NAGase) activity to monitor moulting in the marine prawn Palaemon serratus, and to compare NAGase activity levels along the moult cycle of both male and female specimens. First, to optimise protocols for five different organs, different reaction medium compositions were tested, considering the type buffer, concentration of the substrate, and the load in enzymatic extract. Second, levels of NAGase activity were closely monitored during eight moulting stages in male prawns. Variations in NAGase activity were observed during the moult cycle, with an increase in activity in the late premoult phase of approximately 2.4-fold the level of the intermoult phase. This response profile was observed for each tested organ. The levels of NAGase activity of male and female specimens were compared during three stages of the premoult phase. The patterns observed for both sexes were similar for all the tested organs.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Acetylglucosaminidase
/
Palaemonidae
Limits:
Animals
Language:
En
Journal:
Comp Biochem Physiol A Mol Integr Physiol
Journal subject:
BIOLOGIA MOLECULAR
/
FISIOLOGIA
Year:
2021
Document type:
Article
Affiliation country:
France