Zhang Yitong, Li Fenglan, Fu Kexin, Liu Xiqing, Lien I-Chia, Li Hui
Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, China.
Department of Gastrointestinal, The First Hospital of Jilin University, Changchun, China.
Front Cell Dev Biol. 2021 Sep 21;9:734897. doi: 10.3389/fcell.2021.734897. eCollection 2021.
S-palmitoylation, catalyzed by a family of 23 zinc finger Asp-His-His-Cys (DHHC) domain-containing (ZDHHC) protein acyltransferases localized on the cell membrane. However, stemness genes modulated by ZDHHCs in lung adenocarcinoma (LUAD) remain to be defined. Previously, we have constructed a network of cancer stem cell genes, including INCENP, based on mRNA stemness indices (mRNAsi) of LUAD. INCENP has the function of a chromosomal passenger complex locating to centromeres, which is performed by the conserved region of its N-terminal domain. INCENP protein with a deletion of the first non-conserved 26 amino acid sequence failed to target centromeres. However, the exact function of the deleted sequence has not been elucidated. To identify novel cancer stem cell-relevant palmitoylated proteins and responsible ZDHHC enzymes in LUAD, we analyzed multi-omics data obtained from the database of The Cancer Genome Atlas (TCGA), Gene Expression Omnibus (GEO), Clinical Proteomic Tumor Analysis Consortium (CPTAC), and the Human Protein Atlas (HPA). ZDHHC5 is distinguished from the ZDHHC family for being up-regulated in mRNA and protein levels and associated with malignant prognosis. ZDHHC5 was positively associated with INCENP, and the correlation score increased with LUAD stages. CSS-Palm results showed Cys was the S-palmitoylation site of INCENP. Interestingly, Cys locates in the 1-26 aa sequence of INCENP, and is a conserved site across species. As INCENP is a nuclear protein, we predicted that the nuclear localization signal of ZDHHC5 was specific to the importin αβ pathway, and the result of immunofluorescence proves that ZDHHC5 is located in the nucleoplasm, in addition to the plasma membrane. Therefore, our study indicates the S-palmitoylation of INCENP mediated by ZDHHC5 as a potential mechanism of S-palmitoylation to modulate CSCs in LUAD.
S-棕榈酰化由定位于细胞膜的23个含锌指天冬氨酸-组氨酸-组氨酸-半胱氨酸(DHHC)结构域的(ZDHHC)蛋白酰基转移酶家族催化。然而,ZDHHCs在肺腺癌(LUAD)中调节的干性基因仍有待确定。此前,我们基于LUAD的mRNA干性指数(mRNAsi)构建了一个癌症干细胞基因网络,包括INCENP。INCENP具有定位于着丝粒的染色体乘客复合体的功能,这是由其N端结构域的保守区域执行的。缺失第一个非保守26个氨基酸序列的INCENP蛋白无法靶向着丝粒。然而,缺失序列的确切功能尚未阐明。为了鉴定LUAD中与癌症干细胞相关的新型棕榈酰化蛋白和负责的ZDHHC酶,我们分析了从癌症基因组图谱(TCGA)、基因表达综合数据库(GEO)、临床蛋白质组肿瘤分析联盟(CPTAC)和人类蛋白质图谱(HPA)数据库中获得的多组学数据。ZDHHC5在ZDHHC家族中表现突出,其mRNA和蛋白质水平上调,并与恶性预后相关。ZDHHC5与INCENP呈正相关,且相关评分随LUAD分期增加。CSS-Palm结果显示半胱氨酸是INCENP的S-棕榈酰化位点。有趣的是,半胱氨酸位于INCENP的1-26氨基酸序列中,并且是跨物种的保守位点。由于INCENP是一种核蛋白,我们预测ZDHHC5的核定位信号对输入蛋白αβ途径具有特异性,免疫荧光结果证明ZDHHC5除了位于质膜外,还位于核质中。因此,我们的研究表明ZDHHC5介导的INCENP的S-棕榈酰化是LUAD中S-棕榈酰化调节癌症干细胞的潜在机制。
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