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Updated: Apr 27, 2026

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
Published on: July 14, 2015
Different subunits belonging to the same protein complex often exhibit discordant expression levels and evolutionary
Or Matalon1, Amnon Horovitz1, Emmanuel D Levy1
1Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
Protein complex subunits often lack coordinated expression, genomic presence, and fitness effects. This incoherence may stem from subunit multi-functionality and complex assembly processes.
Area of Science:
- Molecular and Cellular Biology
- Systems Biology
- Genomics
Background:
- Hetero-oligomeric protein complexes are crucial for cellular functions.
- Coordinated subunit behavior (expression, presence, fitness effects) is often expected but rarely observed.
Purpose of the Study:
- To investigate the coherence of subunit properties within hetero-oligomeric protein complexes.
- To explore potential reasons for the observed lack of coherence.
Main Methods:
- Analysis of gene expression data.
- Comparative genomics to assess gene presence/absence.
- Fitness effect evaluation of gene deletions.
Main Results:
- Coherence in subunit expression levels, genomic presence, and fitness effects is frequently weak or absent.
- Observed incoherence challenges traditional assumptions about protein complex subunit behavior.
Conclusions:
- Subunit multi-functionality is a key factor contributing to the lack of coherence.
- Complex assembly mechanisms also play a role in subunit incoherence.
- Rethinking assumptions about protein complex subunit coordination is necessary.
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