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. 1992 Nov 1;89(21):10001–10005. doi: 10.1073/pnas.89.21.10001

Binding of sequence-specific proteins to the adenosine- plus uridine-rich sequences of the murine granulocyte/macrophage colony-stimulating factor mRNA.

M Bickel 1, Y Iwai 1, D H Pluznik 1, R B Cohen 1
PMCID: PMC50265  PMID: 1438189

Abstract

Adenosine+uridine (AU)-rich sequences in the 3' untranslated region (3'UTR) of the mRNA of many cytokines and oncogenes play an important role in mediating RNA degradation. Among the cytokines containing such AU-rich sequences in their 3'UTR is the hematopoietic growth factor granulocyte/macrophage colony-stimulating factor (GM-CSF). GM-CSF gene expression in T cells is regulated by modulation of mRNA half-life. Transfection studies using murine EL-4 thymoma cells have demonstrated that degradation depends on the presence of specific elements in the 3'UTR, including the AU-rich sequences. A number of AU-binding factors have recently been discovered, suggesting that specific regulation may occur through specific protein-mRNA interaction(s). We present evidence from gel-shift analyses and label-transfer experiments that murine cells contain proteins that bind specifically to AU-rich sequences. Three major proteins of 33, 39.5, and 42 kDa are detected. Phorbol ester treatment of cells does not alter the abundance or apparent binding affinity of the proteins. The 33-kDa protein is present in the cytoplasm of murine and human cells, whereas the 39.5- and 42-kDa proteins are present in murine extracts only. Constitutively expressed AU-binding proteins of the type that we describe may function by directing mRNA degradation in the absence of a stimulus to the contrary.

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