Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 276, Issue 19, Pages 15905-15912Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M009430200
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Scp160p is an RNA-binding protein containing 14 tandemly repeated heterogenous nuclear ribonucleoprotein K-homology domains, which are implicated in RNA binding. Scp160p interacts with free and membrane-bound polysomes that are dependent upon the presence of mRNA. Despite its presence on cytosolic polysomes, Scp160p is predominantly localized to the endoplasmic reticulum (ER). Accumulation of Scp160p-ribosome complexes at the ER requires the function of microtubules but is independent of the actin cytoskeleton. We propose that the multi-K-homology-domain protein Scp160p functions as an RNA binding platform, interacting with polysomes that are transported to the ER.
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