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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lovett, D. H. Fanton, C. Locksley, R. M. Bursten, S. L. Stevenson, F. T. |
| Description | Author Affiliation: Stevenson FT ( Medical Service, San Francisco Veterans Administration Medical Center, CA 94121.); |
| Abstract | The cytokine interleukin 1 alpha (IL-1 alpha) is a critical mediator of the immune and inflammatory responses. A unique determinant of its activity as compared with IL-1 beta may be its association with the plasma membrane. While the biologic activity of 'membrane IL-1' has been extensively reported, the mechanism of membrane binding remains unclear. We report that the N terminus of the 31-kDa IL-1 alpha precursor is myristoylated on specific internal lysine residues. Immunoprecipitation of [3H]myristic acid-radiolabeled human monocyte lysates with IgG antibodies to the 31-kDa IL-1 alpha precursor recovered a protein with the physicochemical properties of the IL-1 alpha N-terminal propiece (16 kDa, pI 4.45). Glycyl N-myristoylation of this protein is precluded by the absence of a glycine residue at position 2, suggesting that the propiece is myristoylated on epsilon-amino groups of lysine. To determine which lysine(s) are acylated, a series of synthetic peptides containing all lysines found in the IL-1 alpha N-terminal propiece were used in an in vitro myristoylation assay containing peptide, myristoyl-CoA, and monocyte lysate as enzyme source. Analysis of the reaction products by reverse-phase HPLC and gas-phase sequencing demonstrated the specific myristoylation of Lys-82 and Lys-83, yielding predominantly monoacylated product. A conserved sequence in the IL-1 beta propiece was myristoylated with at least 8-fold less efficiency. Acylation of the IL-1 alpha precursor by a previously unrecognized lysyl epsilon-amino N-myristoyl-transferase activity may facilitate its specific membrane targeting. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 15 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Interleukin-1 Metabolism Myristates Acylation Amino Acid Sequence Cells, Cultured In Vitro Techniques Chemistry Lysine Molecular Sequence Data Molecular Weight Peptides Protein Precursors Sequence Alignment Sequence Homology, Amino Acid Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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