TFII-II is an important multi-functional transcription factor that links events to transcription in several genes. TFII-I is constitutively associated with Bruton's tyrosine kinase (Btk), a non-receptor tyrosine kinase that is essential for normal B cell function, as its mutation causes X-linked agammaglobulinemia (XLA) in humans and X-linked immune deficiency (xid) in mice. We propose that TFII-I is an important and novel component in linking Btk-mediated signaling to transcription in B cells. Furthermore, the TFII-I gene gets deleted in William's syndrome (WS) which is a neuro-developmental disorder with multi-system manifestations, including supravalvar aortic stenosis, hypercalcemia in infancy, mental retardation and cognitive defects. Thus, TFII-I appears to be involved in two genetic disorders: William's Syndrome and X-linked agammaglobulinemia (XLA). Knowledge gained from these studies may help us better understand a critical Btk dependent pathway that links B cell receptor mediated signal transduction to B cell specific transcription. These studies may also ultimately help identify potential target gene(s) that are affected by mutations in Btk. Importantly, these studies may establish possible connections between the neuro-developmental disorders (as in WS) and immuno-developmental disorders (as in XLA). Toward a better understanding of TFII-I function in Btk mediated immune response, we will first map the region(s) in TFII-I important for its physical and functional interactions with BTK. We will determine by deletion and point mutation the region(s) in TFII-I that is important for its interaction with Btk, followed by mapping the sites in TFII-I that are tyrosine phosphorylated by Btk in vitro and in vivo by a combination of site directed mutagenesis, phosphopeptide, finger printing, and mass spectrometric analysis. We will also analyze these mutants in functional transient transfection assays. To determine the functions of TFII-I and its biochemical interactions with Btk in B cells, we will employ in vivo transcriptional analysis. To determine the functions of TFII-I and its biochemical interactions with Btk in B cells, we will employ in vivo transcriptional analysis followed by the interaction studies by co- immunoprecipitation and ectopic expression of mutant forms of TFII-I in B cells. We will also stably express wild type and mutant forms of TFII-I, and Btk in B cell lines, and genetically delete TFII-I from chicken B cells. Finally, to ascertain the localization of TFII-I in the absence and in the presence of non-activated versus activated Btk, first, we will co-express various mutants of TFII-I with Btk in COS cells. Subsequently, we will employ freshly isolated primary splenic B cells derived from wild type, xid and Btk-/- mice and study the localization and tyrosine phosphorylation of TFII-I in the absence and in presence of B cell receptor signaling.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI045150-05
Application #
6704707
Study Section
Allergy and Immunology Study Section (ALY)
Program Officer
Mallia, Conrad M
Project Start
2000-03-01
Project End
2006-02-28
Budget Start
2004-03-01
Budget End
2006-02-28
Support Year
5
Fiscal Year
2004
Total Cost
$314,463
Indirect Cost
Name
Tufts University
Department
Pathology
Type
Schools of Medicine
DUNS #
039318308
City
Boston
State
MA
Country
United States
Zip Code
02111
Desgranges, Zana P; Roy, Ananda L (2006) TFII-I: connecting mitogenic signals to cell cycle regulation. Cell Cycle 5:356-9
Jiang, Wei; Sordella, Raffaella; Chen, Guang-Chao et al. (2005) An FF domain-dependent protein interaction mediates a signaling pathway for growth factor-induced gene expression. Mol Cell 17:23-35
Desgranges, Zana P; Ahn, Jinwoo; Lazebnik, Maria B et al. (2005) Inhibition of TFII-I-dependent cell cycle regulation by p53. Mol Cell Biol 25:10940-52
Hong, Min; Lin, Meng-yin; Huang, Jen-ming et al. (2005) Transcriptional regulation of the Grp78 promoter by endoplasmic reticulum stress: role of TFII-I and its tyrosine phosphorylation. J Biol Chem 280:16821-8
Sacristan, Catarina; Tussie-Luna, Maria Isabel; Logan, Sheila M et al. (2004) Mechanism of Bruton's tyrosine kinase-mediated recruitment and regulation of TFII-I. J Biol Chem 279:7147-58
Wen, Yu-Der; Cress, W Douglas; Roy, Ananda L et al. (2003) Histone deacetylase 3 binds to and regulates the multifunctional transcription factor TFII-I. J Biol Chem 278:1841-7
Cheriyath, Venugopalan; Desgranges, Zana Patrick; Roy, Ananda L (2002) c-Src-dependent transcriptional activation of TFII-I. J Biol Chem 277:22798-805
Tussie-Luna, Maria Isabel; Bayarsaihan, Dashzeveg; Seto, Edward et al. (2002) Physical and functional interactions of histone deacetylase 3 with TFII-I family proteins and PIASxbeta. Proc Natl Acad Sci U S A 99:12807-12
Tussie-Luna, Maria Isabel; Michel, Bertha; Hakre, Shweta et al. (2002) The SUMO ubiquitin-protein isopeptide ligase family member Miz1/PIASxbeta /Siz2 is a transcriptional cofactor for TFII-I. J Biol Chem 277:43185-93
Ji, Hong-Bin; Gupta, Anita; Okamoto, Susumu et al. (2002) T cell-specific expression of the murine CD3delta promoter. J Biol Chem 277:47898-906

Showing the most recent 10 out of 14 publications