A new prosomatostatin-derived peptide reveals a pattern for prohormone cleavage at monobasic sites.
Science
; 238(4830): 1126-9, 1987 Nov 20.
Article
en En
| MEDLINE
| ID: mdl-2891188
ABSTRACT
Cleavage of the peptide bonds of preprosomatostatin at basic residues near the carboxyl terminus yields somatostatin-14, somatostatin-28, and somatostatin-28 (1-12). However, little is known about the molecular forms derived from the amino terminal portion of the precursor, even though this part of the prohormone is highly conserved through evolution. By using an antibody against the amino terminus of prosomatostatin, a decapeptide with the structure Ala-Pro-Ser-Asp-Pro-Arg-Leu-Arg-Gln-Phe, corresponding to preprosomatostatin (25-34), was isolated from the endocrine portion of the rat stomach, the gastric antrum. The antral decapeptide may represent a bioactive product generated from prosomatostatin after a monobasic cleavage similar to that involved in the formation of somatostatin-28. In fact, a monobasic cleavage requires two basic residues and a domain containing nonpolar amino acids such as alanine or leucine, or both.
Buscar en Google
Bases de datos:
MEDLINE
Asunto principal:
Precursores de Proteínas
/
Estómago
/
Somatostatina
Límite:
Animals
Idioma:
En
Revista:
Science
Año:
1987
Tipo del documento:
Article
País de afiliación:
Canadá