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Structure of equine corticotropin releasing factor
J H Livesey1, A Carne, C H Irvine
1Department of Endocrinology, Princess Margaret Hospital, Christchurch, New Zealand.
Peptides
|November 1, 1991
Summary
Researchers isolated and sequenced equine corticotropin-releasing factor (CRF), a peptide hormone. This equine CRF is structurally similar to human CRF and exhibits equipotent biological activity.
Area of Science:
- Endocrinology
- Neuroscience
- Biochemistry
Background:
- Corticotropin-releasing factor (CRF) is a key regulator of the stress response.
- Understanding CRF structure and function across species provides insights into conserved biological mechanisms.
Purpose of the Study:
- To isolate and characterize the equine corticotropin-releasing factor (CRF).
- To determine the amino acid sequence and confirm the structure of equine CRF.
- To compare the biological activity of equine CRF with human CRF.
Main Methods:
- Peptide isolation from equine hypothalami using methanol extraction and immunoaffinity chromatography.
- Purification via reverse-phase high-performance liquid chromatography (HPLC).
- Amino acid sequencing using gas-phase sequence analysis and confirmation of C-terminal amidation via HPLC retention times.
Main Results:
- A 41-amino acid peptide, likely equine CRF, was successfully isolated and purified.
- The complete amino acid sequence was determined, revealing high similarity to human CRF.
- Equine CRF demonstrated equipotent activity compared to human CRF in both in vitro bioassays and plasma protein binding assays.
Conclusions:
- The structure of equine CRF has been elucidated, showing probable carboxyl-terminal amidation.
- Equine CRF is functionally conserved and biologically equivalent to human CRF.
- This finding contributes to comparative endocrinology and the understanding of stress-axis regulation across mammals.