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. 1986 Aug;83(16):5817–5821. doi: 10.1073/pnas.83.16.5817

Bacterial lipopolysaccharides, phorbol myristate acetate, and zymosan induce the myristoylation of specific macrophage proteins.

A A Aderem, M M Keum, E Pure, Z A Cohn
PMCID: PMC386386  PMID: 3461461

Abstract

We demonstrate stimulus-dependent incorporation of exogenously added [3H]myristic acid into specific macrophage proteins. In control unstimulated cells an 18-kDa protein is the major acylated species. In cells incubated with bacterial lipopolysaccharide (LPS), or its monoacyl glucosamine phosphate derivative, fatty acid is incorporated into proteins with molecular mass of 68 kDa and a doublet of approximately 42-45 kDa. Phorbol 12-myristate 13-acetate (PMA) or a phagocytic stimulus (zymosan) promotes the acylation of a similar array of proteins. However, PMA and zymosan also promote the myristoylation of unique proteins of 92 and 50 kDa. The fatty acid associated with each of the acylated proteins is myristic acid. The myristate is probably linked to the proteins through amide bonds, since it is not released by treatment with hydroxylamine. Palmitate and arachidonate are not incorporated into proteins in the same manner. Temporal analysis revealed that LPS-induced proteins are myristoylated by 30 min, while the 50-kDa protein myristoylated in response to PMA is labeled later. Most myristoylated proteins appear to be associated with the membrane fraction. Macrophages from C3H/HeJ mice, which do not respond to LPS, do not show any LPS-dependent protein acylation. Interestingly, zymosan and PMA induce the myristoylation of the 50-kDa protein in C3H/HeJ macrophages, but not the acylation of the 68-kDa and 42-kDa doublet species. We suggest that myristoylation of specific proteins is an intermediary in the capacity of LPS, PMA, and zymosan to alter macrophage functions such as arachidonic acid metabolism.

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Selected References

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