Precursor polyproteins in endocrine and neuroendocrine systems.

Area of Science:

• Biochemistry
• Molecular Biology
• Endocrinology

Background:

• Rapid advancements in protein microsequencing and DNA structural studies are enabling the characterization of novel neuro and hormonal peptides.
• These peptides are often derived from polyprotein precursors, which can yield multiple active molecules.
• Understanding precursor processing is crucial for identifying and characterizing new bioactive peptides.

Purpose of the Study:

• To highlight the progress in neuro and hormonal peptide biosynthesis research.
• To emphasize the role of protein microsequencing and DNA studies in discovering new peptide molecules.
• To present a unifying concept for the maturation of peptide precursors.

Main Methods:

• Protein microsequencing for characterizing molecules in nanomolar quantities.
• DNA structural studies for sequencing peptide precursors.
• Comparative analysis of precursor maturation pathways.

Main Results:

• Identification and characterization of numerous new neuro and hormonal peptides.
• Recognition that peptide precursors are often polyproteins containing multiple active peptides.
• Observation of a conserved maturation pattern involving cleavage at paired basic amino acid sites.

Conclusions:

• The cleavage of polyprotein precursors at paired basic amino acid sites is a general mechanism in peptide biosynthesis.
• This concept, exemplified by LPH and pro-insulin, is applicable to a wide range of neuro and hormonal peptides.
• This understanding facilitates the discovery and characterization of newly identified and future neuro/hormonal peptides.