HCLS1-associated protein X-1(HAX1)is a multifunctional mitochondrial protein involved in the regulation of apoptosis,a crucial process of programmed cell death,and mRNA processing.Despite its significance,limited stru...HCLS1-associated protein X-1(HAX1)is a multifunctional mitochondrial protein involved in the regulation of apoptosis,a crucial process of programmed cell death,and mRNA processing.Despite its significance,limited structural data is available for HAX1,hindering a comprehensive understanding of its biological function.Notably,the caseinolytic mitochondrial matrix peptidase chaperone subunit B(CLPB)has been identified as an interacting partner of HAX1,yet the biophysical properties and binding affinity governing their interaction remain poorly defined.In this study,we present a thorough biophysical characterization of full-length human HAX1 and CLPB,accomplished through recombinant expression and purification.By employing size exclusion chromatography,dynamic light scattering,and circular dichroism spectroscopy,we successfully established their biophysical properties,revealing contrasting structural features,with CLPB displaying a-helical content and HAX1 exhibiting a disordered nature.Moreover,we employed solutionstate nuclear magnetic resonance(NMR)spectroscopy to probe their binding affinity.Our findings demonstrate the formation of stable multimeric complexes between HAX1 and CLPB,and we quantified a dissociation constant in the low range of micro-molar for their high affinity interaction.These results lay the foundation for further in-depth investigations into the dynamics and energetics governing the HAX1-CLPB interaction,ultimately contributing to a comprehensive understanding of their functional mechanisms.展开更多
目的探讨造血细胞特异蛋白1相关蛋白X1(hematopoietic cell specific protein 1-associated protein X1,HAX1)和血管内皮生长因子A(vascular endothelial growth factor A,VEGFA)在脑胶质瘤中的表达及相关性,以及与患者术后生存时间、...目的探讨造血细胞特异蛋白1相关蛋白X1(hematopoietic cell specific protein 1-associated protein X1,HAX1)和血管内皮生长因子A(vascular endothelial growth factor A,VEGFA)在脑胶质瘤中的表达及相关性,以及与患者术后生存时间、预后的关系。方法UALCAN数据库分析多形性胶质母细胞瘤(glioblastoma multiforme,GBM)组织中HAX1及VEGFA mRNA的表达水平;GEPIA数据库分析GBM组织中HAX1与VEGFA表达的相关性;qRT-PCR法检测30例脑胶质瘤及12例正常脑组织中HAX1及VEGFA mRNA的表达;组织芯片结合免疫组化法检测214例脑胶质瘤组织及86例正常脑组织中HAX1和VEGFA蛋白表达水平,分析两种蛋白表达的相关性及两者与脑胶质瘤临床病理特征及患者预后的关系;GEPIA数据库进一步分析两者表达与胶质瘤患者预后的相关性。结果数据库分析结果显示,HAX1和VEGFA mRNA在GBM组织中均高表达(P=3.874100E-02,P=1.62436730732907E-12),且两者在脑胶质瘤中表达呈正相关(r=0.14,P=0.00039);qRT-PCR结果显示,HAX1(1.66±0.40)和VEGFA(2.75±0.73)mRNA在脑胶质瘤组织中均高表达(t=4.744,P<0.0001;t=8.263,P<0.0001);免疫组化结果显示,与正常脑组织相比,HAX1(67.8%,145/214)和VEGFA(72.0%,154/214)蛋白在脑胶质瘤组织中的阳性率更高(χ^(2)=29.174,P<0.05;χ^(2)=33.477,P<0.05),且两者表达呈正相关(r=0.593,P<0.05);HAX1和VEGFA蛋白表达均与行为状态评分(karnofsky performance status,KPS)、组织分化程度、WHO分级、p53及Ki-67蛋白表达密切相关(P<0.05);生存分析显示,HAX1阳性及VEGFA阳性患者的总生存率(5.5%、6.5%)明显低于HAX1阴性患者(62.3%、68.3%)(P<0.001),且两者均阳性的患者总生存率(4.6%)更低(P<0.001);预后分析显示,HAX1蛋白阳性(HR=1.746,P=0.026)、VEGFA蛋白阳性(HR=2.760,P<0.001)、组织中+低分化(HR=3.097,P=0.034)、WHO高分级(HR=1.533,P=0.005)及Ki-67蛋白阳性(HR=1.827,P=0.011)是患者预后的独立危险因素。GEPIA数据库分析结果亦显示,HAX1(HR=1.4,P=0.004)与VEGFA(HR=4.2,P<0.01)表达与患者生存呈负相关。结论HAX1和VEGFA在脑胶质瘤中高表达,其参与了脑胶质瘤的恶性生物学进展,并影响患者预后。展开更多
目的观察HS1相关蛋白X-1(HS1-associated protein X-1,HAX1)对骨肉瘤细胞凋亡的影响。方法应用基因沉默技术在骨肉瘤细胞系MG63中下调HAX1基因的表达,并且通过Western blot实验与免疫荧光实验检测基因沉默效率;应用MTT方法及克隆形成实...目的观察HS1相关蛋白X-1(HS1-associated protein X-1,HAX1)对骨肉瘤细胞凋亡的影响。方法应用基因沉默技术在骨肉瘤细胞系MG63中下调HAX1基因的表达,并且通过Western blot实验与免疫荧光实验检测基因沉默效率;应用MTT方法及克隆形成实验,评价沉默HAX1基因对MG63细胞增殖能力的影响;流式细胞术检测细胞凋亡并通过Western blot实验检测下游蛋白的表达变化。结果沉默HAX1基因抑制人骨肉瘤细胞系MG63的增殖能力与克隆形成能力,流式细胞技术显示沉默HAX1可以诱导MG63细胞凋亡,Western blot实验说明HAX1诱导的MG63细胞凋亡与caspase3和caspase9蛋白上调相关。结论 HAX1可能是维持骨肉瘤细胞增殖能力的关键基因,沉默该基因诱导骨肉瘤细胞凋亡可能与caspase3/caspase9上调相关。展开更多
人类造血细胞特异性蛋白1相关蛋白X-1(human HCLS1-associated protein X-1,HAX1)是一种在机体内广泛存在、可与多种蛋白质相互作用并发挥生物学功能的蛋白质。HAX1基因在转录过程中经过选择性剪切形成多种剪接变体,其剪接变体001翻译...人类造血细胞特异性蛋白1相关蛋白X-1(human HCLS1-associated protein X-1,HAX1)是一种在机体内广泛存在、可与多种蛋白质相互作用并发挥生物学功能的蛋白质。HAX1基因在转录过程中经过选择性剪切形成多种剪接变体,其剪接变体001翻译产生的HAX1蛋白质亚型目前研究较多,它在抗细胞凋亡、调节细胞迁移、维持细胞内Ca2+稳态、调节氧化应激与细胞自噬、维持线粒体蛋白稳态、参与血管生成以及调节信号转导等方面具有关键作用。HAX1在机体内参与多种生物学功能的调节,其异常表达或突变可导致多种疾病。该文旨在系统阐述HAX1的生物学特性及其与临床疾病发生发展的关系,以期为深入研究其功能机制提供参考,且对于与HAX1相关疾病的治疗会提供帮助。展开更多
基金supported by grants from the Special Foundation of President of the Chinese Academy of Sciences(Grant No.,YZJJ2020QN27,YZJJ2021QN33)Anhui Provincial Natural Science Foundation(Grant No.,2108085MC79).
文摘HCLS1-associated protein X-1(HAX1)is a multifunctional mitochondrial protein involved in the regulation of apoptosis,a crucial process of programmed cell death,and mRNA processing.Despite its significance,limited structural data is available for HAX1,hindering a comprehensive understanding of its biological function.Notably,the caseinolytic mitochondrial matrix peptidase chaperone subunit B(CLPB)has been identified as an interacting partner of HAX1,yet the biophysical properties and binding affinity governing their interaction remain poorly defined.In this study,we present a thorough biophysical characterization of full-length human HAX1 and CLPB,accomplished through recombinant expression and purification.By employing size exclusion chromatography,dynamic light scattering,and circular dichroism spectroscopy,we successfully established their biophysical properties,revealing contrasting structural features,with CLPB displaying a-helical content and HAX1 exhibiting a disordered nature.Moreover,we employed solutionstate nuclear magnetic resonance(NMR)spectroscopy to probe their binding affinity.Our findings demonstrate the formation of stable multimeric complexes between HAX1 and CLPB,and we quantified a dissociation constant in the low range of micro-molar for their high affinity interaction.These results lay the foundation for further in-depth investigations into the dynamics and energetics governing the HAX1-CLPB interaction,ultimately contributing to a comprehensive understanding of their functional mechanisms.
文摘人类造血细胞特异性蛋白1相关蛋白X-1(human HCLS1-associated protein X-1,HAX1)是一种在机体内广泛存在、可与多种蛋白质相互作用并发挥生物学功能的蛋白质。HAX1基因在转录过程中经过选择性剪切形成多种剪接变体,其剪接变体001翻译产生的HAX1蛋白质亚型目前研究较多,它在抗细胞凋亡、调节细胞迁移、维持细胞内Ca2+稳态、调节氧化应激与细胞自噬、维持线粒体蛋白稳态、参与血管生成以及调节信号转导等方面具有关键作用。HAX1在机体内参与多种生物学功能的调节,其异常表达或突变可导致多种疾病。该文旨在系统阐述HAX1的生物学特性及其与临床疾病发生发展的关系,以期为深入研究其功能机制提供参考,且对于与HAX1相关疾病的治疗会提供帮助。
