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- W2035756612 abstract "To purify novel ligands for the corticotrophin-releasing factor binding protein (CRF-BP) from ovine brain, whole brain was homogenised in methanol and the supernatant extracted on Sep-pak C18 cartridges followed by a preliminary HPLC step. Three peaks of ovine CRF-BP ligand activity were detected in the HPLC fractions, the first two of which were also detected by a specific corticotrophin-releasing factor two-site immunoradiometric assay, the third peak being detected by a human CRF-BP ligand assay, which will not detect ovine CRF. Human CRF-BP ligand-containing fractions were further purified by affinity chromatography on a human recombinant CRF-BP column with two additional HPLC steps. The human CRF-BP ligand was found to: (a) possess a molecular mass of 4707 Daltons, (b) have an N-terminal amino acid sequence (5 residues) identical to rat urocortin, (c) be detected by a specific urocortin radioimmunoassay, (d) have high affinity for both the human and ovine CRF-BPs and (e) be present in many regions of the ovine brain. Additionally, a 300 bp cDNA fragment sharing 83% homology with the rat urocortin gene was cloned from ovine brain, the product of which was predicted to have an identical amino acid sequence to that of rat urocortin. These pieces of information confirmed the identity of the human CRF-BP ligand as an ovine urocortin. The specially developed CRF-BP ligand assays showed that the rank orders of affinity of the CRF family members for human CRF-BP were: carp urotensin-1>>human CRF=rat/ovine urocortin>human urocortin>>frog sauvagine>>ovine CRF, and those for the ovine CRF-BP were: carp urotensin-1> human CRF=rat/ovine urocortin>human urocortin> frog sauvagine>>ovine CRF. This study describes a successful technique for the purification and detection of peptide ligands for the CRF-BP. We conclude that urocortin is the principal ligand for the CRF-BP in ovine brain and we could find no evidence for a centrally located mammalian sauvagine-like peptide." @default.
- W2035756612 created "2016-06-24" @default.
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- W2035756612 date "2000-02-01" @default.
- W2035756612 modified "2023-09-25" @default.
- W2035756612 title "Urocortin is the principal ligand for the corticotrophin-releasing factor binding protein in the ovine brain with no evidence for a sauvagine-like peptide" @default.
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- W2035756612 doi "https://doi.org/10.1677/jme.0.0240053" @default.
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