Positive effector of BCR-stimulated responses. Couples the B-cell antigen receptor (BCR) to the mobilization of calcium ion either through a phosphoinositide 3-kinase-dependent pathway, when not phosphorylated on tyrosines of the linker region, or through a phospholipase C-gamma-dependent pathway, when phosphorylated on Tyr-341 and Tyr-345. Thus the differential phosphorylation of Syk can determine the pathway by which BCR is coupled to the regulation of intracellular calcium ion. Likewise, mediates responses to ITGB2 signaling and plays an important role in the regulation of down-stream signaling cascades. Phosphorylates USP25 and regulates its intracellular levels.
Specificity
Natural and recombinant Pig Tyrosine-protein kinase SYK
Interacts with RHOH, GAB2 and with NFAM1 (phosphorylated form). Interacts (via its SH2 domains) with CD79A (via its phosphorylated ITAM domain); the interaction stimulates SYK autophosphorylation and activation. Interacts with ITGB2 and FGR. Interacts (phosphorylated form) with SLA; the interaction may link it to CBL, leading to its destruction. Interacts with FCRL3. Interacts (via the second SH2 domain) with USP25 (via C-terminus). Interacts with YWHAG/1433-gamma, which attenuates BCR-induced membrane translocation and activation.
[15/1/25 17:38] Upload to ab completed in less than a minute: 1 file transferred (13.4 Kb/s) Cited for: NUCLEOTIDE SEQUENCE [MRNA];PROTEIN SEQUENCE OF 313-333; 346-354 AND 369-379
[15/1/25 17:38] Upload to ab completed in less than a minute: 1 file transferred (13.4 Kb/s) Cited for: PHOSPHORYLATION BY LYN;INTERACTION WITH LYN;AUTOPHOSPHORYLATION
[15/1/25 17:38] Upload to ab completed in less than a minute: 1 file transferred (13.4 Kb/s) Cited for: FUNCTION IN TRANSCRIPTION REGULATION;INTERACTION WITH VAV1;MUTAGENESIS OF TYR-341 AND TYR-345;PHOSPHORYLATION AT TYR-341
[15/1/25 17:38] Upload to ab completed in less than a minute: 1 file transferred (13.4 Kb/s) Cited for: FUNCTION IN PHOSPHORYLATION OF SH3BP2;MUTAGENESIS OF LYS-395;ENZYME REGULATION