Association of p72 with the src Homology-2 (SH2) Domains of PLC1 in B Lymphocytes (*)

Association of p72 with the src Homology-2 (SH2) Domains of PLC1 in B Lymphocytes (*)
复制标题

p72 与 B 淋巴细胞中 PLC1 的 src 同源 2 (SH2) 结构域的关联 (*)

DOI:
--
复制
发表时间:
1995
影响因子:
4.8
通讯作者:
J. Monroe
J. Monroe
中科院分区:
生物学2区
文献类型:
--
作者:
A. L. Sillman;J. Monroe

文献摘要

参考文献

被引文献

相似文献

磷脂酶C催化的肌醇磷脂水解是B细胞抗原受体信号传导中导致第二信使产生和增殖的关键步骤,其依赖于酪氨酸激酶活化。假定B细胞抗原受体相关酪氨酸激酶p53/56、p59、p55和p72参与受体启动的信号传导。然而,这些激酶中的哪一种参与了酪氨酸磷酸化并导致磷脂酶C响应于抗原受体交联的活化,这是未知的。我们已经使用了一个融合蛋白含有串联src同源性2(SH 2)结构域的磷脂酶C1(PLC 1),以确定B细胞激酶与PLC 1。使用体外激酶测定,我们证明了抗μ刺激的B细胞的酪氨酸激酶活性的SH 2依赖性关联。PLC 1的SH 2结构域与抗μ刺激的B细胞中的一个突出的70-72-kDa酪氨酸磷蛋白相关,但不与静息的B细胞相关。免疫印迹和二次免疫沉淀研究确定这种蛋白质为p72。这些结果暗示了PLC 1和p72在抗原受体刺激的B细胞中的物理相互作用。我们从抗μ刺激的B细胞裂解物中共免疫沉淀p72和PLC 1的能力证实了这一结论。这些结果暗示p72在B细胞抗原受体信号传导过程中参与磷脂酶C1的活化。
Phospholipase C-catalyzed inositol phospholipid hydrolysis, a critical step in B cell antigen receptor signaling leading to second messenger generation and proliferation, depends upon tyrosine kinase activation. The B cell antigen receptor-associated tyrosine kinases p53/56, p59, p55, and p72 are assumed to participate in receptor-initiated signaling. It is unknown, however, which of these kinases is involved in the tyrosine phosphorylation and resulting activation of phospholipase C in response to antigen receptor cross-linking. We have used a fusion protein containing the tandem src homology-2 (SH2) domains of phospholipase C1 (PLC1) to identify B cell kinases which associate with PLC1. Using an in vitro kinase assay, we demonstrate SH2-dependent association of tyrosine kinase activity from anti-μ-stimulated B cells. The PLC1 SH2 domains associate with a prominent 70-72-kDa tyrosine phosphoprotein from anti-μ-stimulated, but not resting, B cells. Immunoblotting and secondary immunoprecipitation studies definitively identify this protein as p72. These results imply a physical interaction between PLC1 and p72 in antigen receptor-stimulated B cells. This conclusion is confirmed by our ability to co-immunoprecipitate p72 and PLC1 from lysates of anti-μ-stimulated B cells. These results implicate p72 in the activation of phospholipase C1 during B cell antigen receptor signaling.
DOI: 10.1016/0003-2697(91)90534-z
发表时间: 1991-02-01
影响因子: 2.9
作者:
GUAN, KL;DIXON, JE
通讯作者: DIXON, JE
DOI: --
发表时间: 1984
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Coggeshall,KM;Cambier,JC
通讯作者: Cambier,JC
小鼠 B 淋巴细胞上膜 Ig 交联后磷脂酶 C-gamma 2 的酪氨酸磷酸化。
DOI: --
发表时间: 1992
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Hempel,WM;Schatzman,RC;DeFranco,AL
通讯作者: DeFranco,AL
鼠 B 淋巴细胞表达磷脂酶 C 同工酶。
DOI: --
发表时间: 1991
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Hempel,WM;DeFranco,AL
通讯作者: DeFranco,AL
DOI: 10.1073/pnas.92.2.359
发表时间: 1995-01
影响因子: 11.1
作者:
Svetlana P. Sidorenko;Che-Leung Law;K. Chandran;Edward A. Clark
通讯作者: Svetlana P. Sidorenko;Che-Leung Law;K. Chandran;Edward A. Clark