title: Isolation of a novel peptide with a unique binding profile from human brain cortex: Tyr-K-MIF-1 (Tyr-Pro-Lys-Gly-NH2).
abstract: Tyr-MIF-1 (Tyr-Pro-Leu-Gly-NH2), Tyr-W-MIF-1 (Tyr-Pro-Trp-Gly-NH2), and MIF-1 (Pro-Leu-Gly-NH2) are biologically active peptides previously isolated from brain tissue. We now have used size exclusion chromatography and several consecutive rp-HPLC steps monitored by RIA to isolate a structurally related peptide from human brain cortex with the sequence Tyr-Pro-Lys-Gly-NH2 (Tyr-K-MIF-1). Determination of the sequence, electrospray mass spectrometry, and comparison of its chromatographic behavior with synthetic Tyr-K-MIF-1 confirmed the structure. Unlike Tyr-MIF-1 and Tyr-W-MIF-1, Tyr-K-MIF-1 does not bind to the mu opiate site; unlike MIF-1, Tyr-K-MIF-1 can bind to the Tyr-MIF-1 site. Of these peptides, only Tyr-K-MIF-1 binds to its own site in brain tissue prepared in Tris buffer. Thus, a new member of the Tyr-MIF-1 family of peptides, with a unique profile of binding, has been isolated from human brain cortex.
authors.affiliation: VA Medical Center, New Orleans, LA.
authors.forename: L
authors.initials: L
authors.lastname: Hackler
authors.forename: A J
authors.initials: AJ
authors.lastname: Kastin
authors.forename: J E
authors.initials: JE
authors.lastname: Zadina
mesh_terms: D000595:Amino Acid Sequence; D005625:Frontal Lobe / Q000737:chemistry*; D006801:Humans; D009075:MSH Release-Inhibiting Hormone / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000302:isolation & purification / Q000378:metabolism; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D011485:Protein Binding; D011957:Receptors, Opioid / Q000378:metabolism; D018017:Receptors, Pituitary Hormone-Regulating Hormone / Q000378:metabolism*; D017421:Sequence Analysis; D017386:Sequence Homology, Amino Acid; D013570:Synaptic Membranes / Q000378:metabolism
chemical_list: D011957:Receptors, Opioid; D018017:Receptors, Pituitary Hormone-Regulating Hormone; C090827:Tyr-K-MIF-1 receptor; C090826:tyrosyl-prolyl-lysyl-glycinamide; C036930:tyrosyl-prolyl-leucyl-glycinamide; D009075:MSH Release-Inhibiting Hormone