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Regulation of Nuclear Protein Sorting

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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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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Related Experiment Video

Updated: Apr 5, 2026

Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
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Enzyme function is regulated by its localization.

Stacey M Gifford1, Pablo Meyer1

  • 1IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, United States.

Computational Biology and Chemistry
|August 18, 2015
PubMed
Summary

Enzyme localization is crucial for function. The glycosyltransferase MurG

Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Enzyme activity is influenced by cellular localization.
  • The glycosyltransferase MurG is essential for cell wall synthesis during Bacillus subtilis sporulation.

Purpose of the Study:

  • To investigate the role of MurG's cellular localization in its enzyme activity during Bacillus subtilis sporulation.
  • To determine the factors regulating MurG localization to the forespore membrane.

Main Methods:

  • Studied the cellular localization of MurG in Bacillus subtilis during sporulation.
  • Utilized point mutations in MurG to disrupt membrane localization.
  • Examined MurG localization in strains with deleted cardiolipin-synthesizing genes.
  • Assessed the effect of external cardiolipin addition on MurG localization.
Keywords:
CardiolipinCell wallEnzyme localizationMurG

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Main Results:

  • MurG gradually enriched to the forespore membrane during sporulation.
  • Disrupting MurG's membrane localization via mutations caused sporulation defects.
  • MurG localization was dependent on the phospholipid cardiolipin.
  • Absence of cardiolipin diminished MurG at the forespore, which was rescued by cardiolipin addition.

Conclusions:

  • Cellular localization is a critical regulatory factor for enzyme function.
  • MurG's localization to the forespore membrane, dependent on cardiolipin, is essential for Bacillus subtilis sporulation.