Related Experiment Videos
Isolation and characterization of two cDNAs from Atlantic cod encoding two distinct psychrophilic elastases
E Gudmundsdóttir1, R Spilliaert, Q Yang
1Science Institute, University of Iceland, Dunhaga, Reykjavik, Iceland.
Summary
Researchers isolated and sequenced two Atlantic cod elastases, revealing distinct enzymes with structural similarities to mammalian elastases and unique characteristics for cold-water fish.
Area of Science:
- Biochemistry
- Molecular Biology
- Fisheries Science
Background:
- Elastases are crucial serine proteases involved in various physiological processes.
- Understanding fish elastases provides insights into adaptation to cold environments.
Purpose of the Study:
- To isolate and characterize cDNAs encoding two Atlantic cod elastases.
- To compare the structural features and evolutionary relationships of cod elastases with other known elastases.
Main Methods:
- cDNA isolation and sequencing.
- Bioinformatic analysis of predicted amino acid sequences.
- Comparison of sequence identity with mammalian elastases.
Main Results:
- Two distinct Atlantic cod elastase cDNAs were isolated and sequenced.
- Predicted amino acid sequences revealed two preproelastases with signal peptides, activation peptides, and mature enzymes.
- Sequence identity between the two cod elastases was 60.1%, and identity with mammalian elastases ranged from 50-64%.
- Both cod elastases possess the catalytic triad (His57, Asp102, Ser195) characteristic of serine proteases.
- A high methionine content was observed in both cod elastases, consistent with psychrophilic fish enzymes.
Conclusions:
- Atlantic cod possess at least two distinct elastase enzymes.
- These enzymes share conserved structural features with mammalian serine proteases but exhibit adaptations for cold environments, indicated by high methionine content.