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Cell Rep. 2014 Jun 12;7(5):1471-1480. doi: 10.1016/j.celrep.2014.04.021. Epub 2014 May 15.

Dynamic interactions between TIP60 and p300 regulate FOXP3 function through a structural switch defined by a single lysine on TIP60.

Author information

1
Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
2
State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai 200031, China.
3
Department of Cell Biology, Neurology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226-0509, USA.
4
Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Pathology and Laboratory Medicine, Children's Hospital, Philadelphia, Philadelphia, PA 19104, USA.
5
Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Electronic address: greene@reo.med.upenn.edu.

Abstract

The human FOXP3 molecule is an oligomeric transcriptional factor able to mediate activities that characterize T regulatory cells, a class of lymphocytes central to the regulation of immune responses. The activity of FOXP3 is regulated at the posttranslational level, in part by two histone acetyltransferases (HATs): TIP60 and p300. TIP60 and p300 work cooperatively to regulate FOXP3 activity. Initially, p300 and TIP60 interactions lead to the activation of TIP60 and facilitate acetylation of K327 of TIP60, which functions as a molecular switch to allow TIP60 to change binding partners. Subsequently, p300 is released from this complex, and TIP60 interacts with and acetylates FOXP3. Maximal induction of FOXP3 activities is observed when both p300 and TIP60 are able to undergo cooperative interactions. Conditional knockout of TIP60 in Treg cells significantly decreases the Treg population in the peripheral immune organs, leading to a scurfy-like fatal autoimmune disease.

PMID:
24835996
PMCID:
PMC4064594
DOI:
10.1016/j.celrep.2014.04.021
[Indexed for MEDLINE]
Free PMC Article

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