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Residue determinants and sequence analysis of cold-adapted trypsins
H K Leiros1, N P Willassen, A O Smalås
1Department of Chemistry, Faculty of Science, University of Tromsø, Norway.
Extremophiles : Life Under Extreme Conditions
|September 14, 1999
Summary
Cold-adapted vertebrates have evolved unique digestive enzymes called trypsins. These cold-active trypsins exhibit reduced hydrophobicity and altered structural features for enhanced function at low temperatures.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Digestive enzyme trypsin is a well-studied protein with known structures across many organisms.
- Cold-adapted organisms often possess enzymes with altered properties to function efficiently at low temperatures.
Purpose of the Study:
- To identify unique structural attributes of cold-adapted vertebrate trypsins.
- To compare cold-active trypsins with their warm-active counterparts.
Main Methods:
- Analysis of 27 trypsin sequences from various vertebrate species.
- Comparative analysis focusing on cold-adapted (e.g., salmon, Antarctic fish, cod) and other vertebrate trypsins.
Main Results:
- Identified approximately 50 conserved unique amino acids in both cold- and warm-active trypsin classes.
- Cold-adapted trypsins show reduced core hydrophobicity and packing density.
- Observed reduced C-terminal stability, absence of a conserved proline residue, and altered loop conformations in cold-adapted trypsins.
Conclusions:
- Cold-adaptation in vertebrate trypsins involves specific structural modifications.
- These modifications, including reduced hydrophobicity and altered loop structures, facilitate enzyme activity at low temperatures.