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Related Experiment Video

Updated: Jun 4, 2026

Affinity Purification of Chloroplast Translocon Protein Complexes Using the TAP Tag

Affinity Purification of Chloroplast Translocon Protein Complexes Using the TAP Tag

Published on: November 1, 2018

Mining the soluble chloroplast proteome by affinity chromatography.

Roman G Bayer¹, Simon Stael, Edina Csaszar

¹Department of Biochemistry and Cell Biology, Max F. Perutz Laboratories, University of Vienna, Austria.

|March 3, 2011

Summary

Researchers identified 448 proteins in pea chloroplasts, including 43 novel ones, by enriching low-abundance proteins. This advances understanding of plant photosynthesis and metabolism.

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Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics

Published on: October 19, 2018

Area of Science:

Plant Biology
Molecular Biology
Biochemistry

Background:

Chloroplasts are vital organelles for plant photoautotrophy and numerous metabolic pathways.
Previous mass spectrometry (MS) efforts identified many chloroplast proteins, but low-abundance proteins remain underrepresented.
A comprehensive protein list is crucial for a deeper understanding of chloroplast functions.

Purpose of the Study:

To develop and apply a strategy for enriching and identifying low-abundance soluble chloroplast proteins.
To expand the known proteome of pea (Pisum sativum) chloroplasts.
To uncover proteins with potential metabolic or regulatory roles.

Main Methods:

A two-step enrichment strategy was employed for pea chloroplast protein extracts.
Depletion of abundant proteins (e.g., ribulose-1,5-bisphosphate carboxylase/oxygenase) using size-exclusion chromatography (SEC) or heat treatment.
Affinity chromatography using ligands specific for ATP- or metal-binding proteins for further purification, followed by MS identification.

Main Results:

A total of 448 proteins were identified in Pisum sativum chloroplasts.
This included 43 putative novel chloroplast proteins, significantly expanding the known proteome.
Yellow fluorescent protein (YFP) fusion analyses confirmed the chloroplast localization of 13 selected proteins, including enzymes and carrier proteins.

Conclusions:

The developed enrichment strategy effectively identified low-abundance soluble chloroplast proteins.
The study provides a more comprehensive catalog of the pea chloroplast proteome.
The identified novel proteins are predicted to play significant roles in chloroplast metabolism and regulation.