Cited by 22RNA Research and SplicingRNA and protein synthesis mechanismsRNA regulation and disease

Intracellular localization and interaction of mRNA binding proteins as detected by FRET

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David Gerecht, Pamela S, Taylor, Molly A, Port, J David·2010·BMC Cell Biology

Abstract

Background: A number of RNA binding proteins (BPs) bind to A+U rich elements (AREs), commonly present within 3'UTRs of highly regulated RNAs. Individual RNA-BPs proteins can modulate RNA stability, RNA localization, and/or translational efficiency. Although biochemical studies have demonstrated selectivity of ARE-BPs for individual RNAs, less certain is the in vivo composition of RNA-BP multiprotein complexes and how their composition is affected by signaling events and intracellular localization. Using FRET, we previously demonstrated that two ARE-BPs, HuR and AUF1, form stable homomeric and heteromeric associations in the nucleus and cytoplasm. In the current study, we use immuno-FRET of endogenous proteins to examine the intracellular localization and interactions of HuR and AUF1 as well as KSRP, TIA-1, and Hedls. These results were compared to those obtained with their exogenously expressed, fluorescently labeled counterparts. Results: All ARE-BPs examined were found to colocalize and to form stable associations with selected other RNA-BPs in one or more cellular locations variably including the nucleus, cytoplasm (in general), or in stress granules or P bodies. Interestingly, FRET based interaction of the translational suppressor, TIA-1, and the decapping protein, Hedls, was found to occur at the interface of stress granules and P bodies, dynamic sites of intracellular RNA storage and/or turnover. To explore the physical interactions of RNA-BPs with ARE containing RNAs,in vitro transcribed Cy3-labeled RNA was transfected into cells. Interestingly, Cy3-RNA was found to coalesce in P body like punctate structures and, by FRET, was found to interact with the RNA decapping proteins, Hedls and Dcp1. Conclusions: Biochemical methodologies, such as co-immunoprecipitation, and cell biological approaches such as standard confocal microscopy are useful in demonstrating the possibility of proteins and/or proteins and RNAs interacting. However, as demonstrated herein, colocalization of proteins and proteins and RNA is not always indicative of interaction. To this point, using FRET and immuno-FRET, we have demonstrated that RNA-BPs can visually colocalize without producing a FRET signal. In contrast, proteins that appear to be delimited to one or another intracellular compartment can be shown to interact when those compartments are juxtaposed.

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Authors
David Gerecht, P. S., Taylor, M. A., & Port, J. D.
Affiliations
  • Case Western Reserve University (US)
  • University of Colorado Anschutz (US)
Corresponding author
Port, J David
Venue
BMC Cell Biology
Published
2010-09-15
Volume
11
Issue
1
Pages
69-69
ISSN
1471-2121 (ISSN-L)
OpenAlex
W1983342911
Cited by
22
References
87
Citations by year
2023: 1 · 2020: 3 · 2019: 2 · 2018: 1 · 2016: 3 · 2015: 4 · 2013: 1 · 2012: 5
FWCI
1.04
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Cell Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
National Heart, Lung, and Blood Institute (R01HL051239, HL 51239)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
Keywords
RNA-binding proteins, AU-rich elements, HuR, AUF1, KSRP, TIA-1, P-bodies, stress granules, protein-protein interaction, RNA-protein interactions, RNA decapping, DCP1, 3' untranslated region, translational regulation, protein colocalization
MeSH terms
ELAV-Like Protein 1, Heterogeneous Nuclear Ribonucleoprotein D0, Animals, Antigens, Surface, Cell Line, Cricetinae, Protein Binding, RNA, Messenger, RNA-Binding Proteins, 3' Untranslated Regions, Protein Transport, Fluorescence Resonance Energy Transfer, Heterogeneous-Nuclear Ribonucleoprotein D, Poly(A)-Binding Proteins, Multiprotein Complexes, ELAV Proteins, Protein Multimerization

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