Threonine phosphorylation regulates the molecular assembly and signaling of EGFR in cooperation with membrane lipids.
J Cell Sci
; 135(15)2022 08 01.
Article
em En
| MEDLINE
| ID: mdl-35791809
ABSTRACT
The cytoplasmic domain of receptor tyrosine kinases (RTKs) plays roles as a kinase and a protein scaffold; however, the allocation of these two functions is not fully understood. Here, we analyzed the assembly of the transmembrane (TM)-juxtamembrane (JM) region of EGFR, one of the best studied members of RTKs, by combining single-pair fluorescence resonance energy transfer (FRET) imaging and a nanodisc technique. The JM domain of EGFR contains a threonine residue (T654) that is phosphorylated after ligand association. We observed that the TM-JM peptides of EGFR form anionic lipid-induced dimers and cholesterol-induced oligomers. The two forms involve distinct molecular interactions, with a bias toward oligomer formation upon threonine phosphorylation. We further analyzed the functions and oligomerization of whole EGFR molecules, with or without a substitution of T654 to alanine, in living cells. The results suggested an autoregulatory mechanism in which T654 phosphorylation causes a switch of the major function of EGFR from kinase-activating dimers to scaffolding oligomers.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Treonina
/
Lipídeos de Membrana
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article