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PMID: 1903535 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

Ferritin mRNA: interactions of iron regulatory element with translational regulator protein P-90 and the effect on base-paired flanking regions.

Harrell CM, McKenzie AR, Patino MM, Walden WE, Theil EC

Abstract

The ferritin iron regulatory element (IRE), a conserved sequence of 28 nucleotides in a hairpin loop, is a conserved mRNA-specific translational regulatory element; flanking the IRE are regions of varying sequence, which form 9-17 base pairs close to the 5' cap. P-90 is a ferritin mRNA-specific translation regulatory protein purified from animal liver and reticulocytes. To study the P-90-RNA interaction, protein nucleases (RNase S1 and T1) and chemical nucleases FeEDTA and/or 1,10-phenanthroline-Cu were used as probes of an oligonucleotide (n = 55), containing the IRE and flanking regions (FL), and natural ferritin mRNA. Footprints and "toeprints" showed that P-90 binding was confined to the stem and loop of the IRE itself. However, P-90 altered the structure of the flanking region by increasing base stacking or helicity (RNase V1 sensitivity). Comparison of the reactivity of the IRE and flanking regions in natural mRNA and the 55-mer showed that long-range interactions included protecting bulges, single-stranded, and stacked regions from protein nucleases as well as stabilizing the P-90-RNA interaction. Structural integration of the IRE with the base-paired flanking regions was indicated by common features of reactivity (periodic hypersensitivity to FeEDTA) and changes in the FL region caused by P-90. The increased secondary structure of the IRE flanking regions caused by P-90 binding to the IRE provides a likely mechanism for blocking initiation of ferritin mRNA translation, since the combined structure (IRE + FL) is so close (8-17 nucleotides) to the cap.

MeSH Terms
Animals Base Composition Base Sequence Binding Sites Edetic Acid Ferric Compounds Ferritins/genetics Gene Expression Regulation Iron/metabolism Molecular Sequence Data Phenanthrolines Protein Biosynthesis Proteins/metabolism RNA, Messenger/genetics,metabolism Rabbits Regulatory Sequences, Nucleic Acid Ribonuclease T1/metabolism Ribonucleases/metabolism
Chemicals
Ferric Compounds Phenanthrolines Proteins RNA, Messenger Ferritins Edetic Acid Iron Ribonucleases Ribonuclease T1 ribonuclease S Fe(III)-EDTA 1,10-phenanthroline
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Harrell C M
Department of Biochemistry, North Carolina State University, Raleigh 27695-7622.
McKenzie A R
Patino M M
Walden W E
Theil E C
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1991-05-15
Pages
4166-70
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC51619
Subset
IM
Grants
NIDDK NIH HHS · DK20251 · United States
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