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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
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Updated: Mar 8, 2026

Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
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Geometric protein localization cues in bacterial cells.

Taylor B Updegrove1, Kumaran S Ramamurthi1

  • 1Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, United States.

Current Opinion in Microbiology
|January 23, 2017
PubMed
Summary
This summary is machine-generated.

Bacterial proteins use membrane shape, or geometric cues, to find their correct locations within cells. This shape-sensing mechanism is key to understanding protein organization in bacteria.

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Area of Science:

  • Bacterial cell biology
  • Molecular biology
  • Biophysics

Background:

  • Bacterial cells exhibit complex molecular organization.
  • Protein localization is crucial for cellular function but remains challenging to study.
  • Emerging evidence suggests geometric cues play a role in protein targeting.

Purpose of the Study:

  • To review bacterial proteins that localize using geometric cues.
  • To explore the mechanisms by which proteins sense membrane curvature.
  • To highlight the significance of membrane geometry in bacterial protein localization.

Main Methods:

  • Literature review of studies on bacterial protein localization.
  • Analysis of proposed mechanisms for membrane curvature sensing.
  • Synthesis of current understanding of geometric cue utilization.

Main Results:

  • Identified several bacterial proteins that utilize membrane curvature for localization.
  • Discussed how proteins differentiate between positive (convex) and negative (concave) curvature.
  • Highlighted the growing prevalence of this localization strategy.

Conclusions:

  • Geometric cues, specifically membrane curvature, are an important mechanism for bacterial protein localization.
  • Understanding shape-sensing proteins provides insights into bacterial cell organization.
  • Further research is needed to fully elucidate the molecular mechanisms involved.