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首页> 美国卫生研究院文献>Biochemical Journal >The primary structure of the Pol-RFamide neuropeptide precursor protein from the hydromedusa Polyorchis penicillatus indicates a novel processing proteinase activity.
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The primary structure of the Pol-RFamide neuropeptide precursor protein from the hydromedusa Polyorchis penicillatus indicates a novel processing proteinase activity.

机译：来自水生水母Polyorchis penicillatus的Pol-RFamide神经肽前体蛋白的一级结构表明一种新的加工蛋白酶活性。

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摘要

Neuropeptides containing the C-terminal sequence Arg-Phe-NH2 (RFamide) occur throughout the Animal Kingdom and are abundant in evolutionarily 'old' nervous systems such as those of cnidarians. From the hydromedusa Polyorchis penicillatus we have previously isolated two neuropeptides, Pol-RFamide I (<Glu-Leu-Leu-Gly-Gly-Arg-Phe-NH2) and Pol-RFamide II (<Glu-Trp-Leu-Lys-Gly-Arg-Phe-NH2). Here we describe the cloning of a common precursor protein for these peptides from P. penicillatus. The precursor protein contains one copy of Pol-RFamide I, 11 copies of Pol-RFamide II and one putative neuropeptide sequence. The Pol-RFamide I sequence is flanked by pairs of basic residues (Arg-Lys). At the C-termini of all Pol-RFamide II sequences, single basic residues (Arg) occur. Paired and single basic residues are established sites for post-translational precursor cleavage. At the N-termini of the Pol-RFamide II sequences, however, basic residues are lacking and, instead, either single Asp (in eight cases) or single Asn residues (in three cases) occur. This means that processing must take place at Asp and/or Asn residues. This is firm evidence for the presence of one or more unconventional processing enzymes. The first type of processing enzyme could be an endoproteinase or aminopeptidase hydrolysing at the C-terminal side of Asp residues. Proteolytic cleavage at acidic amino acid residues has previously been inferred from other cnidarian neuropeptide precursors. The second type of processing enzyme could be an endoproteinase or aminopeptidase hydrolysing at the C-terminal side of Asn residues.
机译：包含C末端序列Arg-Phe-NH2（RFamide）的神经肽遍布整个动物界，并且在进化上“古老”的神经系统（如刺胞动物）中丰富。我们先前已从水生水母Polyorchis penicillatus中分离出两种神经肽，Pol-RFamide I（

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