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Related Concept Videos

Proteomics01:33

Proteomics

7.5K
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Ribosome Profiling02:24

Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
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Related Experiment Video

Updated: Apr 26, 2026

Identification of Protein Interaction Partners in Mammalian Cells Using SILAC-immunoprecipitation Quantitative Proteomics
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Identification of Protein Interaction Partners in Mammalian Cells Using SILAC-immunoprecipitation Quantitative Proteomics

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Autophagosomal proteome analysis by protein correlation profiling-SILAC.

Andrea C Becker1, Jörn Dengjel

  • 1Department of Dermatology, Medical Center - University of Freiburg, Hauptstr. 7, 79104, Freiburg, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|July 26, 2014
PubMed
Summary

Autophagy utilizes autophagosomes for cellular degradation, but their protein makeup remains unclear. This study uses advanced proteomic techniques to identify proteins within these crucial vesicles.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a fundamental cellular degradation process in eukaryotes.
  • Autophagosomes are key vesicles in autophagy, transporting cellular components to lysosomes.
  • The precise protein composition of autophagosomes is not well-characterized.

Purpose of the Study:

  • To investigate the dynamic protein composition of autophagosomes.
  • To identify candidate proteins specifically localized to autophagosomes.
  • To differentiate between autophagosomal and non-specific co-purifying proteins.

Main Methods:

  • Utilized protein correlation profiling (PCP).
  • Employed stable isotope labeling by amino acids in cell culture (SILAC).
  • Combined PCP-SILAC for stringent proteomic analysis of autophagosomes.

Main Results:

  • Successfully identified numerous proteins associated with autophagosomes.
  • Differentiated between proteins integral to autophagosomes and those that co-purify non-specifically.
  • Provided a dataset of candidate autophagosomal proteins for further functional studies.

Conclusions:

  • PCP-SILAC is a powerful method for dissecting the autophagosomal proteome.
  • This approach enhances our understanding of autophagosome biogenesis and function.
  • Identified proteins lay the groundwork for future research into autophagy mechanisms.