An integrated comparative phosphoproteomic and bioinformatic approach reveals a novel class of MPM-2 motifs upregulated in EGFRvIII-expressing glioblastoma cells.

An integrated comparative phosphoproteomic and bioinformatic approach reveals a novel class of MPM-2 motifs upregulated in EGFRvIII-expressing glioblastoma cells.
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DOI:
10.1039/b815075c
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发表时间:
2009-01
影响因子:
--
通讯作者:
White FM
White FM
中科院分区:
生物3区
文献类型:
--
作者:
Joughin BA;Naegle KM;Huang PH;Yaffe MB;Lauffenburger DA;White FM

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胶质母细胞瘤(GBM,WHO IV 级)是一种侵袭性增殖性侵袭性脑肿瘤,临床预后较差,中位生存期为 9 至 12 个月。在之前在 U87MG 胶质母细胞瘤细胞系中进行的磷酸蛋白质组学研究中,我们发现了酪氨酸磷酸化事件,这些事件是通过滴定 EGFRvIII 来调节的,EGFRvIII 是表皮生长因子受体 (EGFR) 的组成型活性突变体,与 GBM 患者的不良预后相关。在本研究中,我们使用磷酸丝氨酸/磷酸苏氨酸特异性抗体 MPM-2(有丝分裂蛋白单克隆 #2)来量化同一细胞系中的丝氨酸/苏氨酸磷酸化事件。通过使用生物信息学工具来鉴定响应于增加的癌基因水平而调节的氨基酸序列基序,鉴定了一组先前未描述的与规范的“pS/pT-P”基序正交的MPM-2表位序列基序。这些基序含有相对于磷酸化氨基酸的-5、-2、+1、+3和+5位置组合的酸性氨基酸。含有这些基序的磷酸肽在表达 EGFRvIII 的细胞中上调,增加了先前未被识别的嗜酸激酶(例如酪蛋白激酶 II (CK2))在 EGFR 信号传导下游的细胞增殖中发挥一般作用的可能性。
Glioblastoma (GBM, WHO grade IV) is an aggressively proliferative and invasive brain tumor that carries a poor clinical prognosis with a median survival of 9 to 12 months. In a prior phosphoproteomic study performed in the U87MG glioblastoma cell line, we identified tyrosine phosphorylation events that are regulated as a result of titrating EGFRvIII, a constitutively active mutant of the epidermal growth factor receptor (EGFR) associated with poor prognosis in GBM patients. In the present study, we have used the phosphoserine/phosphothreonine-specific antibody MPM-2 (mitotic protein monoclonal #2) to quantify serine/threonine phosphorylation events in the same cell lines. By employing a bioinformatic tool to identify amino acid sequence motifs regulated in response to increasing oncogene levels, a set of previously undescribed MPM-2 epitope sequence motifs orthogonal to the canonical “pS/pT-P” motif was identified. These motifs contain acidic amino acids in combinations of the −5, −2, +1, +3, and +5 positions relative to the phosphorylated amino acid. Phosphopeptides containing these motifs are upregulated in cells expressing EGFRvIII, raising the possibility of a general role for a previously unrecognized acidophilic kinase (e.g. casein kinase II (CK2)) in cell proliferation downstream of EGFR signaling.
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