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Related Concept Videos

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Characterization of Neuronal Lysosome Interactome with Proximity Labeling Proteomics
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Biotinylation by antibody recognition-a method for proximity labeling.

Daniel Z Bar1, Kathleen Atkatsh1, Urraca Tavarez1

  • 1National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA.

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|December 20, 2017
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Summary

This study introduces a novel proximity-based labeling method for identifying protein interactions in intact tissues. This technique enhances the understanding of cellular biology and disease mechanisms by mapping protein environments.

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Area of Science:

  • Proteomics
  • Cell Biology
  • Biochemistry

Background:

  • High-throughput organelle composition and proteomic mapping in primary tissues are challenging.
  • Identifying interactors of insoluble proteins forming higher-order structures remains difficult.

Purpose of the Study:

  • To develop and validate a proximity-based labeling approach for identifying protein interactors in fixed cells and primary tissues.
  • To profile the dynamic interactome of lamin A/C and assess its changes under various conditions.

Main Methods:

  • Utilized an antibody-guided proximity-based labeling strategy for biotin deposition onto adjacent proteins.
  • Employed mass spectrometry to capture and identify proteins in close proximity to a target antigen.
  • Validated the method's specificity and sensitivity using the mitochondrial matrix.

Main Results:

  • Successfully demonstrated the method's capability in fixed cells and primary tissues.
  • Profiled the dynamic interactome of lamin A/C across diverse cell and tissue types.
  • Showcased the ability to quantify changes in protein interactomes due to treatments or disease mutations.

Conclusions:

  • The proximity-based labeling method enables high-throughput detection of organelle composition and proteomic mapping directly from primary tissues.
  • This approach facilitates the identification of interactors for insoluble proteins and provides insights into cell biology and disease pathogenesis.