Chromogranin B (secretogranin I), a putative precursor of two novel pituitary peptides through processing at paired basic residues

FEBS Letters

Adrouche, N.¹  Lazure, C.¹  Chretien, M.¹  Mbikay, M.¹  Benjannet, S.¹  Falgueyret, J.P.¹  Seidah, N.G.¹  Leduc, R.¹  Marcinkiewicz, M.¹ 

[1] Laboratories of Biochemical and Molecular Neuroendocrinology, Clinical Research Institute of Montreal, 110 Pine Avenue West, Montreal, Quebec H2W 1R7, Canada

关键词: Chromogranin;    Secretogranin;    Prohormone precursor;    Peptide processing;    GAWK;    CCB;   

DOI  :  10.1016/0014-5793(87)80438-6

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

During the course of reversed-phase high-pressure liquid chromatography (RP-HPLC) purification of the 7B2 peptide originally isolated in our laboratory from human pituitary gland extracts, two novel peptides were identified and purified to homogeneity. The complete amino acid sequence of the first one was established in 1985 and recently found to be entirely homologous to positions 420–493 of the just published chromogranin B sequence. This peptide, denoted GAWK, could originate from chromogranin B following specific cleavage at the basic amino acids flanking both termini of GAWK. Moreover, another peptide isolated in our laboratory from the same source and denoted CCB has been discovered and its sequence is also part of the same chromogranin B molecule. Here again, this peptide, occupying positions 597–653 and located at the COOH-terminal region of chromogranin B, could derive from specific processing at basic amino acids, Arg-Lys-Lys, present at positions 594–596. In a manner reminiscent of the relationship between pancreastatin and chromogranin A, it is proposed that both GAWK and CCB are produced from chromogranin B after specific processing at basic amino acids. These data are thus in favor of a putative role of chromogranins as precursors to potentially bioactive peptides.

【 授权许可】

Unknown