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B p65 Serine 536 Phosphorylation Induced by T Cell Costimulation Is Mediated by I
B Kinase
and Controls the Kinetics of p65 Nuclear Import 1
,

* University of Bern, Department of Chemistry and Biochemistry, Bern, Switzerland;
Department of Immunology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan;
PRESTO, JST, Saitama, Japan;
Subteam for BioResponse Integration, RIKEN (Institute of Physical and Chemical Research), BioResource Center, Tsukuba, Ibaraki, Japan; and
¶ Institute of Pharmacology, Medical School Hannover, Hannover, Germany
Full transcriptional activity of the nuclear, DNA-bound form of NF-
B requires additional posttranslational modifications. In this study, we systematically mapped the T cell costimulation-induced phosphorylation sites within the C-terminal half of the strongly trans-activating NF-
B p65 subunit and identified serine 536 as the main phosphorylation site. The transient kinetics of serine 536 phosphorylation paralleled the kinetics of I
B
and I
B kinase (IKK) phosphorylation and also mirrored the principle of T cell costimulation. The TCR-induced pathway leading to serine 536 phosphorylation is regulated by the kinases Cot (Tpl2), receptor interacting protein, protein kinase C
, and NF-
B-inducing kinase, but is independent from the phosphatidylinositol 3-kinase/Akt signaling pathway. Loss-of-function and gain-of-function experiments showed phosphorylation of p65 serine 536 by IKK
, but not by IKK
. Phosphorylation occurs within the cytoplasmic and intact NF-
B/I
B
complex and requires prior phosphorylation of I
B
at serines 32 and 36. Reconstitution of p65/ cells either with wild-type p65 or a p65 mutant containing a serine to alanine mutation revealed the importance of this phosphorylation site for cytosolic I
B
localization and the kinetics of p65 nuclear import.
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