IBTK Acts as an inhibitor of BTK tyrosine kinase activity, thereby playing a role in B-cell development. Down-regulates BTK kinase activity, leading to interference with BTK-mediated calcium mobilization and NF-kappa-B-driven transcription. Expressed in DeFew, HEK293T, HeLa and in Jurkat, MC3 and NB4 lymphoid cells (at protein level). Isoform 1 is the predominant isoform expressed in all examined tissues and cell lines. Highly expressed in hemopoietic tissues (fetal liver, spleen, lymph node, thymus, peripheral blood leukocytes and bone marrow). Weakly or not expressed in other tissues. 3 alternatively spliced human isoforms have been reported. Note: This description may include information from UniProtKB.
Protein type: Protein kinase, regulatory subunit
Chromosomal Location of mouse Ortholog: 9|9 E3.1
Cellular Component:  cell; cytoplasm; membrane; nucleoplasm
Molecular Function:  protein kinase binding; protein tyrosine kinase inhibitor activity
Biological Process:  negative regulation of protein phosphorylation; release of sequestered calcium ion into cytosol
Reference #:  Q6ZPR6 (UniProtKB)
Alt. Names/Synonyms: 5430411K16Rik; AA409502; BTKI; IBtk; inhibitor of Bruton agammaglobulinemia tyrosine kinase; Inhibitor of Bruton tyrosine kinase; Kiaa1417; mKIAA1417
Gene Symbols: Ibtk
Molecular weight: 149,569 Da
Basal Isoelectric point: 7.88  Predict pI for various phosphorylation states
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Protein Structure Not Found.

Cross-references to other databases:  AlphaFold  |  STRING  |  BioGPS  |  Pfam  |  Phospho.ELM  |  NetworKIN  |  UniProtKB  |  Entrez-Gene  |  Ensembl Gene