Isolation and partial structural characterization of chicken pancreatic colipase

Area of Science:

• Biochemistry
• Enzymology
• Comparative protein analysis

Background:

• Colipase is a crucial pancreatic cofactor that enhances lipase activity.
• Mammalian lipases are often inhibited by bile salts, requiring colipase for optimal function.
• Avian pancreatic lipases and their cofactors have been less extensively studied.

Purpose of the Study:

• To isolate and characterize chicken colipase.
• To determine the amino terminal sequence of avian colipase.
• To compare the avian colipase sequence with homologous mammalian proteins.

Main Methods:

• Isolation of colipase from chicken pancreatic tissue using acidic extraction and Triton X-100 homogenization.
• Determination of the amino terminal amino acid sequence up to position 39.
• Comparative sequence analysis with known mammalian colipases (pig, horse, human).

Main Results:

• Chicken colipase was successfully isolated.
• The amino terminal sequence of chicken colipase was elucidated.
• A high degree of sequence homology was observed between avian and mammalian colipases.

Conclusions:

• Chicken colipase functions as a cofactor for bile salt-inhibited lipases.
• The high homology suggests conserved structural and functional roles for colipase across species.
• This finding contributes to understanding the evolution of digestive enzymes.