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Related Concept Videos

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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Setdb1 and Atf7IP form a hetero-trimeric complex that blocks Setdb1 nuclear export.

Leena Kariapper1, Ila A Marathe2, Ashley Brower Niesman3

  • 1Department of Structural Biology, Van Andel Institute, Grand Rapids, Michigan, USA.

The Journal of Biological Chemistry
|May 8, 2025
PubMed
Summary

Setdb1 and Atf7IP form a stable complex, revealing how Atf7IP prevents Setdb1 export from the nucleus. This interaction is crucial for regulating histone methylation and silencing retrotransposons.

Keywords:
gene silencinheterochromatinhistone methylationtransposable element (TE)

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Structural Biology

Background:

  • Histone H3K9 methylation (H3K9me) by Setdb1 is essential for silencing retrotransposons (rTEs) by forming heterochromatin.
  • Atf7IP is a known binding partner of Setdb1, mediating its nuclear localization, activation, and chromatin recruitment.
  • The structural basis of the Setdb1/Atf7IP interaction remained largely unknown.

Purpose of the Study:

  • To elucidate the structural details of the Setdb1/Atf7IP interaction.
  • To understand the mechanism by which Atf7IP regulates Setdb1 nuclear localization and activity.
  • To investigate the role of Atf7IP paralogs in Setdb1 complex formation and function.

Main Methods:

  • AlphaFold2 structure prediction.
  • Biochemical reconstitution assays in vitro.
  • Cellular assays to confirm complex formation and localization.

Main Results:

  • Setdb1 and Atf7IP form a stable hetero-trimeric complex (1:2 stoichiometry) in vitro and in cells.
  • Atf7IP self-associates into multimers, which are resolved upon Setdb1 binding.
  • Setdb1 binds Atf7IP via coiled-coil interactions involving Setdb1 nuclear export signals (NES), and Atf7IP competes with Crm1 for NES binding, inhibiting Setdb1 nuclear export.
  • Setdb1 also forms hetero-trimeric complexes with Atf7IP2, and mixed heterotrimers of Setdb1/Atf7IP/Atf7IP2 can form.
  • Differential expression of Atf7IP and Atf7IP2 suggests their heterotrimers may fine-tune Setdb1 activity.

Conclusions:

  • The structural and biochemical characterization reveals a novel hetero-trimeric complex of Setdb1 and Atf7IP.
  • Atf7IP acts as a crucial regulator by directly inhibiting Setdb1 nuclear export via competition with Crm1.
  • The formation of distinct Setdb1/Atf7IP/Atf7IP2 heterotrimers offers a mechanism for fine-tuning epigenetic regulation of retrotransposons.