Cited by 182Genomics and Chromatin DynamicsHIV Research and TreatmentNuclear Structure and Function

A tripartite DNA-binding element, comprised of the nuclear localization signal and two AT-hook motifs, mediates the association of LEDGF/p75 with chromatin in vivo

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Turlure, F.·2006·Nucleic Acids Research

Abstract

Lens epithelium-derived growth factor p75 (LEDGF/p75) is a DNA-binding, transcriptional co-activator that participates in HIV-1 integration site targeting. Using complementary approaches, we determined the mechanisms of LEDGF/p75 DNA-binding in vitro and chromatin-association in living cells. The binding of highly-purified, recombinant protein was assayed by surface plasmon resonance (SPR) and electrophoretic mobility gel shift. Neither assay revealed evidence for sequence-specific DNA-binding. Residues 146-197 spanning the nuclear localization signal (NLS) and two AT-hook motifs mediated non-specific DNA-binding, and DNA-binding deficient mutants retained the ability to efficiently stimulate HIV-1 integrase activity in vitro. Chromatin-association was assessed by visualizing the localization of EGFP fusion proteins in interphase and mitotic cells. Although a conserved N-terminal PWWP domain was not required for binding to condensed mitotic chromosomes, its deletion subtly affected the nucleoplasmic distribution of the protein during interphase. A dual AT-hook mutant associated normally with chromatin, yet when the mutations were combined with NLS changes or deletion of the PWWP domain, chromatin-binding function was lost. As the PWWP domain did not readily bind free DNA in vitro, our results indicate that chromatin-association is primarily affected through DNA-binding, with the PWWP domain likely contributing a protein interaction to the overall affinity of LEDGF/p75 for human chromatin.

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  • The N-terminal half of LEDGF/p75 contains a PWWP chromatin reader domain and two AT-hook DNA-binding motifs that mediate chromatin association, while its C-terminal IBD binds integrase.

    “Elements including a PWWP chromatin reader domain and two copies of an AT-hook DNA binding motif in the N-terminal half of the protein mediate its association with chromatin, while the C-terminal IN-binding domain (IBD) confers binding to IN103–105.”

    From Structure and function of retroviral integrase (2022) · cites this paper as [104]

  • LEDGF/p75 acts as a bimodal tether in lentiviral integration targeting.

    “LEDGF/p75 appears to function as a bimodal tether in lentiviral integration targeting.”

    From Structure and function of retroviral integrase (2022) · cites this paper as [104]

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Authors
Turlure, F.
Affiliations
Dana-Farber Cancer Institute (US)
Corresponding author
Turlure, F.
Venue
Nucleic Acids Research
Published
2006-03-06
Volume
34
Issue
5
Pages
1653-1665
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2059740818
Cited by
181
References
55
Citations by year
2026: 3 · 2025: 3 · 2024: 7 · 2023: 4 · 2022: 7 · 2021: 5 · 2020: 8 · 2019: 3 · 2018: 8 · 2017: 4 · 2016: 5 · 2015: 10 · 2014: 15 · 2013: 7 · 2012: 13
FWCI
6.94
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Nucleic Acids Research (publishedVersion, other-oa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • Spiral (Imperial College London) (submittedVersion, other-oa)
Funders
  • National Institutes of Health
  • Center for AIDS Research, University of Washington
  • National Institute of Allergy and Infectious Diseases (AI52014, AI60354, AI39394, R01AI039394, R37AI039394, R01AI052014, P30AI060354)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
LEDGF/p75, nuclear localization signal, AT-hook motif, nonspecific DNA binding, chromatin association, PWWP domain, HIV-1 integrase, transcriptional coactivator, metaphase chromosomes
MeSH terms
Amino Acid Sequence, Binding Sites, Chromatin, DNA, DNA-Binding Proteins, HeLa Cells, Humans, Molecular Sequence Data, Transcription Factors, Consensus Sequence, Protein Structure, Tertiary, HIV Integrase, Nuclear Localization Signals, AT-Hook Motifs, Adaptor Proteins, Signal Transducing

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