Cited by 365Retinoids in leukemia and cellular processesPeroxisome Proliferator-Activated ReceptorsCholesterol and Lipid Metabolism

Distinct Roles for Cellular Retinoic Acid-binding Proteins I and II in Regulating Signaling by Retinoic Acid

Open access
Dong, Diane, Ruuska, Sarah E., Levinthal, David J., Noy, Noa·1999·Journal of Biological Chemistry

Abstract

The pleiotropic effects of retinoic acid (RA) in mammalian cells are mediated by two classes of proteins: the retinoic acid receptors (RAR) and cellular retinoic acid-binding proteins (CRABP-I and CRABP-II). Here we show that expression of CRABP-II, but not CRABP-I, markedly enhanced RAR-mediated transcriptional activation of a reporter gene in COS-7 cells. The equilibrium dissociation constants of complexes of CRABP-I or CRABP-II with RA were found to differ by 2-fold. It is thus unlikely that the distinct effects of the two proteins on transactivation stem from differential ligand-binding affinities. The mechanisms by which RA transfers from the CRABPs to RAR were thus investigated directly. The rate constant for movement of RA from CRABP-II, but not from CRABP-I, to RAR strongly depended on the concentration of the acceptor. The data suggest that transfer of RA from CRABP-I to RAR involves dissociation of the ligand from the binding protein, followed by association with the receptor. In contrast, movement of RA from CRABP-II to the receptor is facilitated by a mechanism that involves direct interactions between CRABP-II and RAR. These findings reveal a striking functional difference between CRABP-I and CRABP-II, and point at a novel mechanism by which the transcriptional activity of RA can be regulated by CRABP-II.

Integrity signals

Registry

Crossref · 10.1074/jbc.274.34.23695

Cites

29 of 29 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • CRABPII specifically associates with RA with subnanomolar affinities.

    “It is a small cytosolic protein, which specifi cally associates with RA with subnanomolar affi nities.”
  • The resulting complex channels RA from the binding protein to the RAR and markedly facilitates the formation of the liganded receptor.

    “The resulting complex channels RA from the binding protein to the RAR and markedly facilitates the formation of the liganded receptor.”
  • Upon binding of RA, CRABPII mobilizes to the nucleus, where it associates with RARs through direct protein-protein interactions.

    “Upon binding of RA, CRABPII mobilizes to the nucleus, where it associates with RARs through direct protein-protein interactions (17)(18)(19).”
  • In the cytosol, RA binds CRABPII, which belongs to the intracellular lipid binding protein (iLBP) family.

    “In the cytosol, RA is well known to bind the cellular retinoic acid-binding protein CRABPII, which belongs to the intracellular lipid binding proteins iLBP family.”
  • CRABPII significantly enhances the transcriptional activity of RARs and sensitizes the cells to RA biological activities.

    “It was demonstrated that by directly delivering RA to RARs, CRABPII significantly enhances the transcriptional activity of RARs and sensitizes the cells to RA biological activities.”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Dong, D., Ruuska, S. E., Levinthal, D. J., & Noy, N.
Affiliations
Cornell University (US)
Corresponding author
Noy, Noa
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1999-08
Volume
274
Issue
34
Pages
23695-23698
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2001068122
Cited by
362
References
29
Citations by year
2026: 5 · 2025: 9 · 2024: 10 · 2023: 11 · 2022: 9 · 2021: 12 · 2020: 14 · 2019: 16 · 2018: 4 · 2017: 15 · 2016: 19 · 2015: 18 · 2014: 20 · 2013: 17 · 2012: 15
FWCI
3.34
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (CA 68150, R01CA068150)
  • National Institute of Diabetes and Digestive and Kidney Diseases (5-T32-DK07158, T32DK007158)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
retinoic acid, cellular retinoic acid-binding protein I, CRABP2, retinoic acid receptor, ligand transfer, transcriptional activation, ligand dissociation, protein-protein interaction, ligand binding affinity
MeSH terms
Animals, Tretinoin, Transcriptional Activation, Receptors, Retinoic Acid, COS Cells

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review