Premium
The p80 TNF receptor‐associated kinase (p80TRAK) associates with residues 354–397 of the p80 cytoplasmic domain: similarity to casein kinase
Author(s) -
Darnay Bryant G.,
Singh Sanjaya,
Aggarwal Bharat B.
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)00251-2
Subject(s) - casein kinase 1 , casein kinase 2 , protein kinase domain , phosphorylation , biology , serine , microbiology and biotechnology , biochemistry , casein kinase 2, alpha 1 , receptor , kinase , cytoplasm , protein kinase a , chemistry , mitogen activated protein kinase kinase , gene , mutant
The cytoplasmic domain of the p80 TNF receptor associates with a protein kinase, termed p80TRAK, that phosphorylates both the p60 and p80 TNF receptors. To determine the region of the cytoplasmic domain that is necessary for binding of p80TRAK and the region that it phosphorylates, a series of deletions of the p80 cytoplasmic domain were constructed and expressed as glutathione‐S‐transferase fusion proteins. These fusions were then used to examine the binding of p80TRAK derived from cellular extracts. We found that out of 174 residues (266–439) in the cytoplasmic domain of p80 receptor, 44 residues (354–397) were sufficient for binding of p80TRAK. Interestingly, this was also the region that contained the phosphorylation site for p80TRAK. Phosphoamino acid analysis of this region revealed phosphorylation primarily on serine residues. Furthermore, we found that, like p80TRAK, purified casein kinase 1 (CK1) also binds to residues 354–397 of the p80 TNF receptor and causes its phosphorylation. Additionally, the activity of p80TRAK was inhibited by CK1‐7, the CK1‐specific inhibitor. Thus, our results indicate that p80TRAK associates with a short stretch of ∼44 residues located in the cytoplasmic domain of the p80 TNF receptor and that this kinase is similar to CK1.