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Related Experiment Video

Updated: May 30, 2026

LabVIEW-operated Novel Nanoliter Osmometer for Ice Binding Protein Investigations

LabVIEW-operated Novel Nanoliter Osmometer for Ice Binding Protein Investigations

Published on: February 4, 2013

Aspartic proteinases in Antarctic fish.

Viviana De Luca¹, Giovanna Maria, Gaia De Mauro

¹CNR, Institute of Protein Biochemistry, Via P. Castellino 111-80131, Naples, Italy.

Marine Genomics

|July 30, 2011

Summary

Antarctic fish aspartic proteinases, called Nothepsins, show unique properties like high catalytic efficiency, differing significantly from mammalian counterparts. These adaptations help maintain fish metabolism in extreme cold.

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Area of Science:

Biochemistry
Molecular Biology
Fish Physiology

Background:

Antarctic Notothenioidei fish exhibit molecular adaptations for low-temperature survival.
Aspartic proteinases play crucial roles in fish physiology, especially in extreme environments.

Purpose of the Study:

To review and characterize aspartic proteinases from Antarctic fish.
To investigate adaptations of these enzymes to the unique Antarctic environment.
To compare Antarctic aspartic proteinases with their mammalian counterparts.

Main Methods:

Purification and biochemical analysis of cathepsin D from Chionodraco hamatus.
Heterologous expression and biochemical characterization of Trematomus bernacchii pepsin variants.
Identification and classification of novel aspartic proteinases from Antarctic fish livers.

Main Results:

Biochemical properties of cathepsin D from icefish were determined.
Antarctic pepsin variants showed distinct characteristics upon heterologous expression.
Two novel aspartic proteinases, named 'Nothepsins', were identified and classified.
Nothepsins exhibit significantly different properties compared to mammalian aspartic proteinases, including higher catalytic efficiency.

Conclusions:

Antarctic aspartic proteinases (Nothepsins) possess unique biochemical features.
These enzymes are adapted for function at low temperatures, aiding metabolic processes in Antarctic fish.
Studying Nothepsins provides insights into enzyme adaptation and fish physiology in extreme cold environments.