Nucleotide sequence of human monocyte interleukin 1 precursor cDNA

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• Interleukin 1 (IL-1) is a key protein involved in host defense and immune responses.
• Understanding IL-1's molecular basis is crucial for immunology research.

Purpose of the Study:

• To isolate and characterize the human Interleukin 1 (IL-1) cDNA.
• To elucidate the precursor form and processing of IL-1.

Main Methods:

• Isolation of human IL-1 cDNA using hybridization techniques.
• In vitro translation of isolated mRNA in a reticulocyte system.
• Expression of hybrid-selected mRNA in Xenopus laevis oocytes.

Main Results:

• Successfully isolated human IL-1 cDNA encoding a 269 amino acid precursor (30,747 Mr).
• Cell-free translation yielded immunoprecipitable IL-1.
• Oocyte injection led to the secretion of biologically active IL-1.
• Sequence analysis indicated IL-1 is initially translated as a precursor and then processed.

Conclusions:

• The study provides the cDNA sequence for human IL-1.
• Evidence suggests IL-1 is synthesized as a larger precursor molecule and subsequently processed to its active form.
• This finding advances the understanding of IL-1's molecular regulation in immune processes.