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人乳头瘤病毒 16 型感染激活宿主丝氨酸精氨酸蛋白激酶 1(SRPK1)-剪接因子轴。

Human papillomavirus type 16 infection activates the host serine arginine protein kinase 1 (SRPK1) - splicing factor axis.

机构信息

MRC - University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical Veterinary and Life Sciences, University of Glasgow, Garscube Estate, Glasgow G61 1QH, UK.

Present address: GlaxoSmithKline, Stevenage, UK.

出版信息

J Gen Virol. 2020 May;101(5):523-532. doi: 10.1099/jgv.0.001402. Epub 2020 Mar 13.

Abstract

The infectious life cycle of human papillomaviruses (HPVs) is tightly linked to keratinocyte differentiation. Evidence suggests a sophisticated interplay between host gene regulation and virus replication. Alternative splicing is an essential process for host and viral gene expression, and is generally upregulated by serine arginine-rich splicing factors (SRSFs). SRSF activity can be positively or negatively controlled by cycles of phosphorylation/dephosphorylation. Here we show that HPV16 infection leads to accumulation of the paradigm SRSF protein, SRSF1, in the cytoplasm in a keratinocyte differentiation-specific manner. Moreover, HPV16 infection leads to increased levels of cytoplasmic and nuclear phosphorylated SRSF1. SR protein kinase 1 (SRPK1) phosphorylates SRSF1. Similar to HPV upregulation of SRSF1, we demonstrate HPV upregulation of SRPK1 via the viral E2 protein. SRPK1 depletion or drug inhibition of SRPK1 kinase activity resulted in reduced levels of SRSF1, suggesting that phosphorylation stabilizes the protein in differentiated HPV-infected keratinocytes. Together, these data indicate HPV infection stimulates the SRPK1-SRSF axis in keratinocytes.

摘要

人乳头瘤病毒 (HPV) 的感染生命周期与角质形成细胞分化密切相关。有证据表明宿主基因调控和病毒复制之间存在复杂的相互作用。选择性剪接是宿主和病毒基因表达的一个重要过程,通常由丝氨酸/精氨酸丰富的剪接因子 (SRSFs) 上调。SRSF 的活性可以通过磷酸化/去磷酸化循环进行正或负调控。在这里,我们发现 HPV16 感染导致模式 SRSF 蛋白 SRSF1 以角质形成细胞分化特异性的方式在细胞质中积累。此外,HPV16 感染导致细胞质和核内磷酸化 SRSF1 水平升高。SR 蛋白激酶 1 (SRPK1) 磷酸化 SRSF1。与 HPV 上调 SRSF1 相似,我们通过病毒 E2 蛋白证明 HPV 上调 SRPK1。SRPK1 耗竭或 SRPK1 激酶活性的药物抑制导致 SRSF1 水平降低,表明磷酸化使分化的 HPV 感染的角质形成细胞中的蛋白质稳定。总之,这些数据表明 HPV 感染刺激角质形成细胞中的 SRPK1-SRSF 轴。

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