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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Chemical Reactive Anchoring Lipids with Different Performance for Cell Surface Re-engineering Application.

Pratima Vabbilisetty1, Mallorie Boron1, Huan Nie2

  • 1Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation of Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, Ohio 44115, United States.

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Summary

Researchers developed novel anchor lipids for cell surface modification. Cholesterol-based lipids showed superior membrane incorporation and reduced internalization, enabling advanced cell engineering and study.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Materials Science

Background:

  • Cell surface modification is crucial for studying molecular functions and improving cellular capabilities.
  • Site-specific labeling and modification require reactive groups on the cell surface.

Purpose of the Study:

  • To synthesize and evaluate two chemical reactive anchor lipids for cell surface re-engineering.
  • To compare the efficacy of phospholipid-based (DSPE-PEG-DBCO) and cholesterol-based (CHOL-PEG-DBCO) anchor lipids in RAW 264.7 cells.

Main Methods:

  • Synthesis of DSPE-PEG-DBCO and CHOL-PEG-DBCO anchor lipids.
  • Incubation of RAW 264.7 cells with anchor lipids at varying concentrations and times.
  • Confirmation of lipid incorporation using copper-free click chemistry, biotinylation, and streptavidin-FITC binding.
  • Assessment of cytotoxicity and cell membrane residence time via confocal microscopy.

Main Results:

  • Cholesterol-based anchor lipid demonstrated higher cell membrane incorporation efficiency compared to the phospholipid-based lipid.
  • Cholesterol-based anchor lipid exhibited less internalization into the cells.
  • Both anchor lipids showed low cytotoxicity upon incorporation.
  • Cell membrane residence time of the cholesterol-based anchor lipid was successfully evaluated.

Conclusions:

  • Chemical reactive anchor lipids offer potential for cell surface re-engineering.
  • Cholesterol-based anchor lipids are promising for efficient and stable cell surface modification.
  • This approach facilitates the study of cell surface structures and functions.