NDLI: Multiple proteins interact at a unique cis-element in the 3'-untranslated region of amyloid precursor protein mRNA.

Content Provider	Journal of Biological Chemistry (JBC)
Author	Zaidi, S. H. Denman, R. Malter, J. S.
Abstract	Growing evidence suggests that Alzheimer's disease results from dysregulated production and deposition of beta-amyloid in the central nervous system. beta-Amyloid is derived from proteolytic processing of one of multiple amyloid precursor protein (APP) isoforms. The production of APP in many somatic tissues and tumor cell lines provides a more accessible model to study the regulation of APP gene expression. Recent data suggest that APP mRNAs accumulate in activated lymphocytes and neuronal tumor lines. We are interested in defining the contribution of alterations in stability to changes in steady-state APP mRNA levels in these model systems. Herein we demonstrate by mobility shift assay that the 3'-untranslated region of APP RNAs which contain a contiguous 29-base region interacts in vitro with multiple mRNA-binding proteins found in cytosolic lysates prepared from normal and transformed human cells. UV cross-linking of radiolabeled APP RNAs to cytosolic protein extracts followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis identified six distinct RNA-protein complexes of 42, 47, 65, 73, 84, and 104 kDa. Competition assays with APP, AU-rich, or irrelevant RNAs demonstrated that binding was specific and in some cases preferential for AU- or U-rich sequences by which we tentatively place the binding site of the proteins along the 29-base region. APP mRNA-binding proteins were constitutively active in all tumor lines examined as well as at diminished levels in whole human brain cytosolic lysates. The core element is AU-rich and highly conserved between human and some murine APP mRNAs. In the accompanying paper (Zaidi, S. H. E. and Malter, J. S. (1994) J. Biol. Chem. 269, 24007-24013) we show that this 29-base element in the 3'-untranslated region regulates the stability of APP mRNA. Cumulatively these data suggest that steady-state APP mRNA levels are modulated by cytosolic protein-RNA interactions.
Related Links	http://www.jbc.org/content/269/39/24000.abstract
Ending Page	24006
Starting Page	24000
Page Count	7
File Format	HTM / HTML PDF
ISSN	00219258
Journal	Journal of Biological Chemistry (JBC)
Issue Number	39
Volume Number	269
e-ISSN	1083351X
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	1994-09-30
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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