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  • Title: Neuropeptide-gamma: a peptide isolated from rabbit intestine that is derived from gamma-preprotachykinin.
    Author: Kage R, McGregor GP, Thim L, Conlon JM.
    Journal: J Neurochem; 1988 May; 50(5):1412-7. PubMed ID: 2834512.
    Abstract:
    The neurokinin A-like immunoreactivity in an extract of rabbit small intestine was resolved into two molecular forms by gel permeation chromatography. These components were purified to apparent homogeneity by reverse-phase HPLC. The primary structure of the larger component was established as the following: Asp-Ala-Gly-His-Gly-Gln-Ile-Ser-His-Lys-Arg-His-Lys-Thr-Asp-Ser-Phe-Val- Gly-Leu - Met.NH2. This amino acid sequence represents residues (72-92) of gamma-preprotachykinin, as predicted from the nucleotide sequence of a cloned cDNA from the rat. The peptide, termed neuropeptide-gamma, lacks residues (3-17) of neuropeptide K, and this segment is specified exactly by exon 4 in the preprotachykinin gene. The smaller form of neurokinin A-like immunoreactivity was identical to neurokinin A. Neuropeptide K was not present in the extract, demonstrating that the pathways of post-translational processing of beta- and gamma-preprotachykinins in the rabbit gut are different.
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