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J. Biol. Chem., Vol. 275, Issue 39, 30653-30659, September 29, 2000
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From the Two isoforms of interleukin (IL)-15 exist: one
with a short and another with a long signal peptide (LSP). Experiments
using combinations of the LSP and mature proteins IL-2, IL-15, and
green fluorescent protein revealed complex pathways of intracellular trafficking. In one pathway, the LSP was unprocessed, and IL-15 was not
glycosylated, remained in the cytoplasm, and was degraded. The second
trafficking pathway involved endoplasmic reticulum entry,
N-linked glycosylation, and alternative partial LSP
processing. The third pathway involved endoplasmic reticulum entry,
followed by glycosylation, complete processing, and ultimately
secretion. The complex intracellular trafficking patterns of LSP-IL-15
with its impediments to secretion as well as impediments to translation may be required due to the potency of IL-15 as an inflammatory cytokine. In terms of a more positive role, we propose that
intracellular infection may relieve the burdens on translation and
intracellular trafficking to yield effective IL-15 expression.
The Long Signal Peptide Isoform and Its Alternative Processing
Direct the Intracellular Trafficking of Interleukin-15*
,
,
,
¶
Metabolism Branch, NCI, National Institutes
of Health and the § Laboratory of Cell Biochemistry and
Biology, NIDDK, National Institutes of Health,
Bethesda, Maryland 20892-1374
*
The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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