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. 1989 Apr;86(8):2976–2980. doi: 10.1073/pnas.86.8.2976

Isolation and identification of a diuretic hormone from the tobacco hornworm, Manduca sexta

Hiroshi Kataoka 1,*, Ruth G Troetschler 1, Jorge P Li 1, Steven J Kramer 1, Robert L Carney 1, David A Schooley 1,†
PMCID: PMC287043  PMID: 16594029

Abstract

A diuretic hormone (DH) has been isolated from pharate adult heads of Manduca sexta by a nine-step purification procedure. The primary structure of the amino-terminal 40 residues was determined by sequence analysis of intact DH. The structure of an amidated carboxyl-terminal tryptic hexapeptide was characterized by sequence analysis of the peptide, and this hexapeptide was later compared by reversed-phase liquid chromatography with two synthetic hexapeptides with the free acid or amide at the carboxyl terminus. The complete structure of M. sexta DH was established as a 41-residue peptide without disulfide bonds: H-Arg-Met-Pro-Ser-Leu-Ser-Ile-Asp-Leu-Pro-Met-Ser-Val-Leu-Arg-Gln-Lys-Leu-Ser -Leu-Glu-Lys-Glu-Arg-Lys-Val-His-Ala-Leu-Arg-Ala-Ala-Ala-Asn-Arg-Asn-Phe-Leu- Asn-Asp-Ile-NH2. M. sexta DH was synthesized and shown to have chromatographic and biological properties identical with those of the native material. Synthetic DH stimulated fluid excretion in vivo upon injection into larval M. sexta and newly emerged adult Pieris rapae. M. sexta DH has considerable sequence homology with corticotropin-releasing factor, urotensin I, and sauvagine.

Keywords: osmoregulation, amino acid sequence, corticotropin-releasing factor, sauvagine, urotensin I

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Selected References

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