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Releasing Nonperipheral Subunits from Protein Complexes in the Gas Phase
Guanbo Wang1, Lingxiao Chaihu1,2, Meng Tian3
1School of Chemistry and Materials Science, Nanjing Normal University, 210023 Nanjing, China.
Native mass spectrometry and tandem mass spectrometry reveal how nonperipheral subunits are released from protein complexes. This provides new insights into protein complex stoichiometry and topology.
Area of Science:
- Biochemistry
- Structural Biology
- Analytical Chemistry
Background:
- Protein quaternary structure is crucial for function.
- Native mass spectrometry preserves protein complexes in the gas phase.
- Tandem mass spectrometry (CID) analyzes subunit release for structural information.
Purpose of the Study:
- To investigate dissociation pathways of nonperipheral subunits in hetero-complexes using CID.
- To explore how releasing nonperipheral subunits provides unique structural data.
Main Methods:
- Native mass spectrometry to maintain complex integrity.
- Tandem mass spectrometry with collision-induced dissociation (CID) at high energies.
- Analysis of dissociation pathways for various protein assemblies.
Main Results:
- Demonstrated preferential release of peripheral subunits during CID.
- Identified pathways for nonperipheral subunit release, including sequential dissociation and direct ejection.
- Showed nonperipheral subunits can be released from charge-reduced or elongated complexes.
Conclusions:
- Controlled CID can release nonperipheral subunits, offering unique structural insights.
- Understanding these dissociation pathways enhances knowledge of protein complex stoichiometry and topology.
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