[PMID]: | 26590318 |
[Au] Autor: | Paensuwan P; Hartl FA; Yousefi OS; Ngoenkam J; Wipa P; Beck-Garcia E; Dopfer EP; Khamsri B; Sanguansermsri D; Minguet S; Schamel WW; Pongcharoen S |
[Ad] Endereço: | Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok 65000, Thailand; |
[Ti] Título: | Nck Binds to the T Cell Antigen Receptor Using Its SH3.1 and SH2 Domains in a Cooperative Manner, Promoting TCR Functioning. |
[So] Source: | J Immunol;196(1):448-58, 2016 Jan 01. |
[Is] ISSN: | 1550-6606 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Ligand binding to the TCR causes a conformational change at the CD3 subunits to expose the CD3ε cytoplasmic proline-rich sequence (PRS). It was suggested that the PRS is important for TCR signaling and T cell activation. It has been shown that the purified, recombinant SH3.1 domain of the adaptor molecule noncatalytic region of tyrosine kinase (Nck) can bind to the exposed PRS of CD3ε, but the molecular mechanism of how full-length Nck binds to the TCR in cells has not been investigated so far. Using the in situ proximity ligation assay and copurifications, we show that the binding of Nck to the TCR requires partial phosphorylation of CD3ε, as it is based on two cooperating interactions. First, the SH3.1(Nck) domain has to bind to the nonphosphorylated and exposed PRS, that is, the first ITAM tyrosine has to be in the unphosphorylated state. Second, the SH2(Nck) domain has to bind to the second ITAM tyrosine in the phosphorylated state. Likewise, mutations of the SH3.1 and SH2 domains in Nck1 resulted in the loss of Nck1 binding to the TCR. Furthermore, expression of an SH3.1-mutated Nck impaired TCR signaling and T cell activation. Our data suggest that the exact pattern of CD3ε phosphorylation is critical for TCR functioning. |
[Mh] Termos MeSH primário: |
Proteínas Adaptadoras de Transdução de Sinal/metabolismo Ativação Linfocitária/imunologia Proteínas Oncogênicas/metabolismo Receptores de Antígenos de Linfócitos T/metabolismo Linfócitos T/imunologia
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[Mh] Termos MeSH secundário: |
Proteínas Adaptadoras de Transdução de Sinal/genética Sequência de Aminoácidos Sítios de Ligação Complexo CD3/metabolismo Linhagem Celular Tumoral Seres Humanos Células Jurkat Proteínas Oncogênicas/genética Fosforilação Domínios Proteicos Ricos em Prolina Ligação Proteica Receptores de Antígenos de Linfócitos T/imunologia Transdução de Sinais/imunologia Domínios de Homologia de src
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[Pt] Tipo de publicação: | JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T |
[Nm] Nome de substância:
| 0 (Adaptor Proteins, Signal Transducing); 0 (CD3 Complex); 0 (CD3E protein, human); 0 (Nck protein); 0 (Oncogene Proteins); 0 (Receptors, Antigen, T-Cell) |
[Em] Mês de entrada: | 1605 |
[Cu] Atualização por classe: | 171116 |
[Lr] Data última revisão:
| 171116 |
[Sb] Subgrupo de revista: | AIM; IM |
[Da] Data de entrada para processamento: | 151122 |
[St] Status: | MEDLINE |
[do] DOI: | 10.4049/jimmunol.1500958 |
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