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EMBO J
1983 Jan 01;25:711-4. doi: 10.1002/j.1460-2075.1983.tb01489.x.
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A novel peptide designated PYLa and its precursor as predicted from cloned mRNA of Xenopus laevis skin.
Hoffmann W
,
Richter K
,
Kreil G
.
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A variety of peptides closely related to mammalian hormones and neurotransmitters are secreted from amphibian skin. Using cDNA clones of mRNA isolated from skin of Xenopus laevis, we have been searching for precursors of some of these constituents. Here we present the sequences of parts of cloned mRNAs which code for precursors of a novel peptide. In the predicted polypeptides, pairs of basic residues flank a sequence of 25 amino acids terminating with glycine, the signal for the formation of a terminal amide. The predicted final product liberated from these precursors would be a peptide comprised of 24 amino acids starting with tyrosine and ending with leucine amide, which has therefore been designated PYLa. This peptide can form an amphipathic helix similar to that found in peptides with cytotoxic, bacteriostatic and/or lytic properties.
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