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Chemoproteomics reveals immunogenic and tumor-associated cell surface substrates of ectokinase CK2α
Cell Chemical Biology ( IF 6.6 ) Pub Date : 2024-08-22 , DOI: 10.1016/j.chembiol.2024.07.018 Corleone S Delaveris 1 , Sophie Kong 1 , Jeff Glasgow 1 , Rita P Loudermilk 1 , Lisa L Kirkemo 1 , Fangzhu Zhao 1 , Fernando Salangsang 2 , Paul Phojanakong 2 , Juan Antonio Camara Serrano 2 , Veronica Steri 2 , James A Wells 3
Cell Chemical Biology ( IF 6.6 ) Pub Date : 2024-08-22 , DOI: 10.1016/j.chembiol.2024.07.018 Corleone S Delaveris 1 , Sophie Kong 1 , Jeff Glasgow 1 , Rita P Loudermilk 1 , Lisa L Kirkemo 1 , Fangzhu Zhao 1 , Fernando Salangsang 2 , Paul Phojanakong 2 , Juan Antonio Camara Serrano 2 , Veronica Steri 2 , James A Wells 3
Affiliation
Foreign epitopes for immune recognition provide the basis of anticancer immunity. Due to the high concentration of extracellular adenosine triphosphate in the tumor microenvironment, we hypothesized that extracellular kinases (ectokinases) could have dysregulated activity and introduce aberrant phosphorylation sites on cell surface proteins. We engineered a cell-tethered version of the extracellular kinase CK2α, demonstrated it was active on cells under tumor-relevant conditions, and profiled its substrate scope using a chemoproteomic workflow. We then demonstrated that mice developed polyreactive antisera in response to syngeneic tumor cells that had been subjected to surface hyperphosphorylation with CK2α. Interestingly, these mice developed B cell and CD4+ T cell responses in response to these antigens but failed to develop a CD8+ T cell response. This work provides a workflow for probing the extracellular phosphoproteome and demonstrates that extracellular phosphoproteins are immunogenic even in a syngeneic system.
中文翻译:
化学蛋白质组学揭示了胞外激酶 CK2α 的免疫原性和肿瘤相关细胞表面底物
用于免疫识别的外源表位提供了抗癌免疫的基础。由于肿瘤微环境中细胞外三磷酸腺苷浓度高,我们假设细胞外激酶 (ectokinases) 可能具有失调活性并在细胞表面蛋白上引入异常磷酸化位点。我们设计了细胞外激酶 CK2α 的细胞栓系版本,证明它在肿瘤相关条件下对细胞具有活性,并使用化学蛋白质组学工作流程分析了其底物范围。然后我们证明,小鼠在响应受到 CK2α 表面过度磷酸化的同基因肿瘤细胞时产生了多反应性抗血清。有趣的是,这些小鼠对这些抗原产生了 B 细胞和 CD4+ T 细胞反应,但未能产生 CD8+ T 细胞反应。这项工作提供了一种探测细胞外磷酸化蛋白质组的工作流程,并证明即使在同基因系统中,细胞外磷蛋白也具有免疫原性。
更新日期:2024-08-22
中文翻译:
化学蛋白质组学揭示了胞外激酶 CK2α 的免疫原性和肿瘤相关细胞表面底物
用于免疫识别的外源表位提供了抗癌免疫的基础。由于肿瘤微环境中细胞外三磷酸腺苷浓度高,我们假设细胞外激酶 (ectokinases) 可能具有失调活性并在细胞表面蛋白上引入异常磷酸化位点。我们设计了细胞外激酶 CK2α 的细胞栓系版本,证明它在肿瘤相关条件下对细胞具有活性,并使用化学蛋白质组学工作流程分析了其底物范围。然后我们证明,小鼠在响应受到 CK2α 表面过度磷酸化的同基因肿瘤细胞时产生了多反应性抗血清。有趣的是,这些小鼠对这些抗原产生了 B 细胞和 CD4+ T 细胞反应,但未能产生 CD8+ T 细胞反应。这项工作提供了一种探测细胞外磷酸化蛋白质组的工作流程,并证明即使在同基因系统中,细胞外磷蛋白也具有免疫原性。