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Nucleocytoplasmic lectins.

John L Wang1, Richard M Gray, Kevin C Haudek

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, 501 Biochemistry Building, East Lansing, MI 48824, USA. wangj@msu.edu

Biochimica Et Biophysica Acta
|July 9, 2004
PubMed
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Intracellular lectins, like galectins and annexins, are found in cell nuclei and cytoplasm, influencing processes like splicing and apoptosis. Their carbohydrate-binding roles within cells require further investigation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Lectins are proteins that bind carbohydrates, playing roles in cellular recognition and signaling.
  • Intracellular lectins, including galectins and annexins, are increasingly recognized for their functions within the cytoplasm and nucleus.
  • While their roles are being elucidated, the specific endogenous carbohydrate ligands for these intracellular lectins remain largely unknown.

Purpose of the Study:

  • To review and summarize current knowledge on intracellular lectins, focusing on galectins and annexins.
  • To highlight the documented locations (cytoplasm and nucleus) and functions of these lectins.
  • To identify the knowledge gaps regarding the carbohydrate-binding activities and endogenous ligands of intracellular lectins.

Main Methods:

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  • Literature review of studies on intracellular lectins.
  • Analysis of documented cellular localization (cytoplasmic and nuclear) of specific lectin families (galectins, annexins).
  • Summary of reported interacting partners and functional roles (e.g., splicing, apoptosis, DNA polymerase activity).

Main Results:

  • Galectins (e.g., Galectin-1, -3, -7, -12) are involved in pre-mRNA splicing, cell cycle regulation, and apoptosis.
  • Annexins (e.g., A1, A2, A4, A5, A11) are found in the nucleus and cytoplasm, with some exhibiting helicase activity or association with DNA polymerase.
  • Annexins A4, A5, and A6 bind to carbohydrate structures, similar to galectins.
  • Specific endogenous carbohydrate ligands for most intracellular lectins have not been identified.

Conclusions:

  • Intracellular lectins, particularly galectins and annexins, perform diverse functions within the nucleus and cytoplasm.
  • The precise significance of the carbohydrate-binding activity of these intracellular lectins is an area requiring substantial future research.
  • Identifying endogenous ligands is crucial for understanding the full functional spectrum of intracellular lectins.