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Membrane protein association by potential intramembrane charge pairs
P Cosson1, S P Lankford, J S Bonifacino
1Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
Nature
|May 30, 1991
Summary
The T-cell receptor alpha chain
Area of Science:
- Molecular Biology
- Immunology
- Protein Biochemistry
Background:
- The T-cell receptor (TCR) alpha chain's transmembrane domain is crucial for its assembly with the CD3 delta chain.
- Unassembled TCR alpha chains undergo rapid degradation in the endoplasmic reticulum, a process regulated by specific residues within the transmembrane domain.
Purpose of the Study:
- To investigate the role of basic amino acids in the TCR alpha chain's transmembrane domain in mediating protein-protein interactions.
- To determine if introducing basic residues into other transmembrane domains can induce specific interactions with acidic residues.
Main Methods:
- Site-directed mutagenesis to introduce basic residues into the transmembrane domain of the Tac antigen.
- Analysis of protein-protein interactions between modified Tac antigen and CD3 chains.
Main Results:
- A single basic residue in the Tac antigen's transmembrane domain induced interaction with the CD3 chain, mediated by its transmembrane acidic residue.
- Optimal interaction occurred when charged residues were positioned at the same membrane level.
Conclusions:
- Specific charged residues within transmembrane domains can drive protein-protein interactions.
- This finding offers a strategy for engineering artificial protein dimers by manipulating transmembrane domain charge pairs.