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PMID: 7610048 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Autoregulation of poly(A)-binding protein synthesis in vitro.

Nucleic acids research ·Vol. 23 ·No. 12 ·1995-06-25 ·Pages 2198-205

de Melo Neto OP, Standart N, Martins de Sa C

Abstract

The poly(A)-binding protein (PABP), in a complex with the 3'poly(A) tail of eukaryotic mRNAs, plays important roles in the control of translation and message stability. All known examples of PABP mRNAs contain an extensive A-rich sequence in their 5' untranslated regions. Studies in mammalian cells undergoing growth stimulation or terminal differentiation indicate that PABP expression is regulated at the translational level. Here we examine the hypothesis that synthesis of the PABP is autogenously controlled. We show that the endogenous inactive PABP mRNA in rabbit reticulocytes can be specifically stimulated by addition of low concentrations of poly(A) and that this stimulation is also observed with in vitro transcribed human PABP mRNA. By deleting the A-rich region from the leader of human PABP mRNA and adding it upstream of the initiator AUG in a reporter mRNA we show that the adenylate tract is sufficient and necessary for mRNA repression and poly(A)-mediated activation in the reticulocyte cell-free system. UV cross-linking experiments demonstrate that the leader adenylate tract binds PABP. Furthermore, addition of recombinant GST-PABP to the cell-free system represses translation of mRNAs containing the A-rich sequence in their 5'UTR, but has no effect on control mRNA. We thus conclude that in vitro PABP binding to the A-rich sequence in the 5' UTR of PABP mRNA represses its own synthesis.

MeSH Terms
Adenosine Monophosphate/chemistry,metabolism Animals Base Sequence Cell-Free System Gene Expression Regulation/drug effects Humans Molecular Sequence Data Poly A/pharmacology Poly(A)-Binding Proteins Protein Biosynthesis/drug effects RNA, Messenger/metabolism RNA-Binding Proteins/biosynthesis,genetics Rabbits Receptors, Cytoplasmic and Nuclear Recombinant Proteins/pharmacology Reticulocytes/chemistry,metabolism Triticum
Chemicals
Poly(A)-Binding Proteins RNA, Messenger RNA-Binding Proteins Receptors, Cytoplasmic and Nuclear Recombinant Proteins Poly A Adenosine Monophosphate
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
de Melo Neto O P
Department of Biochemistry, University of Cambridge, UK.
Standart N
Martins de Sa C
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Article Info
Journal
Nucleic acids research
Abbr.
Nucleic Acids Res
ISSN
0305-1048
Published
1995-06-25
Pages
2198-205
Language
English
Region
England
NLM ID
0411011
PMCID
PMC307008
Subset
IM
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