Activity of the nonreceptor tyrosine kinase Ack1 is regulated by tyrosine phosphorylation of its Mig6 homology region.

Activity of the nonreceptor tyrosine kinase Ack1 is regulated by tyrosine phosphorylation of its Mig6 homology region.
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非受体酪氨酸激酶ACK1的活性受其MIG6同源性区域的酪氨酸磷酸化调节。

DOI:
10.1002/1873-3468.14505
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发表时间:
2022-11
期刊:
影响因子:
3.5
通讯作者:
Miller, W. Todd
Miller, W. Todd
中科院分区:
生物学3区
文献类型:
--
作者:
Kan, Yagmur;Miller, W. Todd

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Ack1是一种原致癌酪氨酸激酶,与肿瘤抑制因子Mig6同源,Mig6是表皮生长因子受体(EGFR)的抑制剂。对Mig6与EGFR结合至关重要的残基在Ack1的Mig6同源区(MHR)内保守。我们测试了Ack1 MHR和激酶结构域(KD)之间的分子内相互作用是否受磷酸化调节。我们在MHR中发现了两个Src磷酸化位点(Y859, Y860)。在Ack1 KD中加入src磷酸化的MHR可增强酶活性。Src在细胞中的共表达导致Ack1活性增加;Y859/Y860的突变阻断了这种增加。总的来说,这些数据表明Ack1 MHR的磷酸化调节了它的激酶活性。Y859/Y860的磷酸化发生在脑癌、乳腺癌、结肠癌和前列腺癌中,其中Ack1的基因组扩增或体细胞突变在疾病进展中发挥作用。我们的研究结果表明,MHR磷酸化可能导致肿瘤中Ack1的失调。
Ack1 is a proto-oncogenic tyrosine kinase with homology to the tumour suppressor Mig6, an inhibitor of the epidermal growth factor receptor (EGFR). The residues critical for binding of Mig6 to EGFR are conserved within the Mig6 homology region (MHR) of Ack1. We tested whether intramolecular interactions between the Ack1 MHR and kinase domain (KD) are regulated by phosphorylation. We identified two Src phosphorylation sites within the MHR (Y859, Y860). Addition of Src-phosphorylated MHR to the Ack1 KD enhanced enzymatic activity. Co-expression of Src in cells led to increased Ack1 activity; mutation of Y859/Y860 blocked this increase. Collectively, the data suggest that phosphorylation of the Ack1 MHR regulates its kinase activity. Phosphorylation of Y859/Y860 occurs in cancers of the brain, breast, colon, and prostate, where genomic amplification or somatic mutations of Ack1 play a role in disease progression. Our findings suggest that MHR phosphorylation could contribute to Ack1 dysregulation in tumours.
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