搜索到1531篇“ CHAPERONE“的相关文章
The Sigma-1 Receptor as a Pharmacologic Chaperone: Energetics
2024年
Initially thought to be an opioid receptor subtype, Sigma-1 receptors (S1R) are now known to be unique proteins that have chaperone-like properties. As such, they play critical roles in cellular signaling, homeostasis, and cell survival. These roles offer significant insight for understanding homeostasis of normal physiologic processes, and the pathophysiologic consequences of disruption of normal function. Because of the broad nature of chaperone action, S1R agonists and antagonists represent potential drug discovery goals for the pharmacotherapeutic treatment of a variety of disorders that result from dysfunctional proteins. The present study summarizes the S1R as a pharmacologic chaperone crucial for protein folding and cellular homeostasis. Through literature review and thermodynamic analysis, it explores how S1R stabilizes target proteins, influencing neuroprotection and potential drug therapies. The binding of chaperones to target proteins is thermodynamically favorable, offering insights into treating diseases linked to protein misfolding.
Robert B. RaffaJoseph V. Pergolizzi Jr.
关键词:CHAPERONEENERGETICSTHERMODYNAMICS
Molecular Chaperone-Dependent Polymer Translocation through Nanopores: The Effects of Chaperone Concentration and Chaperone-Polymer Interaction
2024年
The polymer translocation through a nanopore from a donor space(or named cis side) to a receiver space(trans side) in the chaperone-induced crowded environment has attracted increasing attention in recent years due to its significance in biological systems and technological applications. In this work, we mainly focus on the effects of chaperone concentration and chaperone-polymer interaction on the polymer translocation. By assuming the polymer translocation to be a quasi-equilibrium process, the free energy F of the polymer can be estimated by Rosenbluth-Rosenbluth method and then the translocation time τ can be calculated by Fokker-Plank equation based on the obtained free energy landscape. Our calculation results show that the translocation time can be controlled by independently tuning the chaperone concentration and chaperone-polymer interaction at the cis side or the trans side. There exists a critical chaperone-polymer attraction ε~*=-0.2 at which the volume exclusion and interaction effects of the chaperone can balance each other. Additionally, we also find that at large chaperone-polymer attraction, the translocation time is mainly governed by the diffusion coefficient of the polymer.
Chang-Sheng ZuoKang WangLi-Zhen SunTing-Ting Sun
Bcl-xL regulates radiation-induced ferroptosis through chaperone-mediated autophagy of GPX4 in tumor cells
2024年
Objective:To investigate the role and the molecular mechanisms of apoptotic signaling in ferroptosis to regulate tumor radiosensitivity.Methods:Reactive oxygen species(ROS)and lipid peroxide levels were detected in Mouse embryonic fibroblasts(MEFs)with Bcl-xL or Mcl-1 deficiency induced by erastin.Colony formation,ROS,lipid peroxidation and the transcription/translation levels of PTGS2 were measured in Bcl-xL knockdown tumor cells induced by 5 Gyγ-rays or co-treated with ferrostatin-1(Ferr-1).The protein levels of LPCAT3,ACSL4 and PEBP1 in Bcl-xL knockout MEF cells were evaluated in Bcl-xL knockout MEF cells post-radiation.Moreover,the interaction of heat shock protein 90(HSP90)with Bcl-xL,GPX4,or LAMP2A was detected by protein mass spectrometry and immunoprecipitation assays.Results:Manipulating Bcl-xL levels facilitated radiation-induced ferroptosis by augmenting the enzymatic oxidation of polyunsaturated fatty acids(PUFAs)and enhancing chaperone-mediated autophagy(CMA)of glutathione peroxidase 4(GPX4)(MEF cell line:t=4.540,P<0.01;A549 cell line:t=56.16,P<0.0001;t=4.885,P<0.01;HCT116 cell line:t=14.75,P<0.01;t=7.363,P<0.05).Downregulating Bcl-xL expression promoted the activity of acyl-CoA synthetase long-chain family member 4(ACSL4),thus increasing the enzymatic oxidation of PUFAs(t=4.258,P<0.01).Moreover,depletion of Bcl-xL expedited the CMA process targeting GPX4 by facilitating the association of GPX4 with heat shock protein 90(HSP90)and LAMP2A following radiation exposure.Subsequent degradation of GPX4 led to the accumulation of lipid peroxides,ultimately triggering ferroptosis.Conclusions:Our study provides initial insights into the regulatory role of Bcl-xL in ferroptosis and underscores the potential of targeting Bcl-xL as a promising therapeutic strategy for cancer by modulating both apoptotic and ferroptotic pathways.
Jing HanRuru WangBin ChenFeng XuLiangchen WeiAn XuLijun WuGuoping Zhao
关键词:BCL-XL
黄瓜铜伴侣蛋白基因CsATX1克隆及表达分析
2024年
中国黄瓜品种繁多,但黄瓜的抗逆性不强,容易产生病虫害。因此,分析和验证抗病相关的基因,探究黄瓜抗病的分子机理,可为培育黄瓜抗性品种提供理论基础。本研究以黄瓜为试验材料,采用RT-PCR技术克隆了黄瓜铜伴侣蛋白基因CsATX1的cDNA序列全长,并对其进行生物信息学分析;采用荧光定量PCR的方法分析CsATX1基因在细菌性角斑病侵染0~96 h下的表达情况,以期探究其与黄瓜抗病性的关系。结果表明:CsATX1基因序列全长为768 bp,含有一个288 bp的ORF阅读框,可编码95个氨基酸,该基因编码蛋白的相对分子质量约为9.95 kD,理论等电点是5.07,为亲水性蛋白,不具有跨膜结构,不含信号肽序列。系统进化树分析表明Cs ATX1与葫芦科同源蛋白的亲缘关系最近。RT-qPCR分析表明,CsATX1在黄瓜叶中有表达,在黄瓜细菌性角斑病菌侵染下,该基因在黄瓜叶中表达显著增高,受黄瓜细菌性角斑病菌的诱导。该研究结果为深入探究CsATX1基因功能提供科学依据。
孙婷婷孟令波李淑敏
关键词:黄瓜基因克隆黄瓜细菌性角斑病荧光定量PCR
Structure of a histone hexamer bound by the chaperone domains of SPT16 and MCM2
2024年
Dear Editor,The passage of DNA replication forks during eukaryotic cell division disrupts the nucleosomes they encounter,and de novo assembly of nucleosomes onto replicated DNA must take place to restore chromatin structure.There are two sources of histones for the replicationcoupled nucleosome assembly.
Songlin GanWen-Si YangLiting WeiZhiguo ZhangRui-Ming Xu
关键词:STRUCTURENUCLEOSOME
α7烟碱型乙酰胆碱受体分子伴侣Tmem35a的克隆及其功能研究
2024年
烟碱型乙酰胆碱受体(nicotinic acetylcholine receptors,nAChRs)属于配体门控离子通道受体,其中α7nAChR亚型广泛分布于大脑皮层、丘脑和海马体等区域。此外,在小胶质细胞、巨噬细胞、骨髓细胞等也有分布,研究发现其与胆碱能抗炎通路的功能密切相关,是阿尔茨海默症和精神分裂症药物开发的重要靶标。建立稳定的体外药物筛选体系,对于靶向α7 nAChR新药的高效筛选至关重要。在非洲爪蟾卵母细胞膜上,重组表达nAChRs的不同亚型,并通过电生理技术进行电流检测,是一种先进而复杂的新药筛选模型。分子伴侣可以协助部分nAChRs亚基组装形成功能性受体,为靶向该受体的化合物筛选提供稳定表达的模型。为此,本研究从大鼠体内分离克隆了α7 nAChR的一个分子伴侣基因,其名称为Tmem35a(transmembrane protein 35A),进一步构建了该基因的重组表达载体,再利用体外转录技术获得了该基因的cRNA,将之与α7 nAChR的cRNA混合后同时注射到非洲爪蟾卵母细胞中进行表达。然后,利用双电极电压钳检测该分子伴侣对α7 nAChR电流表达和通道药理活性的影响。结果显示,TMEM35A(也被称为novel acetylcholine receptor chaperone,NACHO)可有效提高α7 nAChR蛋白在卵母细胞膜上的表达,受体蛋白表达量提高了约1倍;其配体乙酰胆碱(acetylcholine,ACh)刺激诱发的峰值电流提高了约10倍。注入Tmem35a cRNA后的卵母细胞,其表达的α7 nAChR对激动剂ACh的半数效应浓度为228.5μmol·L^(-1),和本体223.3μmol·L^(-1)基本一致,维持了α7受体正常功能特性。研究结果表明,分子伴侣NACHO有效协助了α7 nAChR在非洲爪蟾卵母细胞的异源表达,稳定表达的α7 nAChR可以为靶向该受体的先导化合物活性筛选提供模型。本研究所有动物实验过程经广西大学伦理委员会审查批准(批准号:GXU-2023-0249)。
王紫涵于津鹏长孙东亭朱晓鹏罗素兰
关键词:Α7烟碱型乙酰胆碱受体基因克隆药物筛选模型
分子伴侣prsA2基因缺失对单增李斯特菌致病性的影响
2024年
【目的】构建单增李斯特菌分子伴侣prsA2基因缺失株与回补株,探究其对单增李斯特菌内化素B(InlB)锚定能力以及致病性的影响。【方法】利用穿梭质粒pKSV7和回补质粒pIMK2分别构建prsA2基因缺失株与回补株;通过生长曲线分析亲本株10403S、缺失株ΔprsA2和回补株CΔprsA2生长能力;利用Western blotting检测prsA2基因缺失对单增李斯特菌InlB锚定的影响;通过肠上皮细胞(Caco-2)黏附侵袭试验与免疫荧光试验、小鼠毒力试验分析prsA2基因缺失对单增李斯特菌黏附侵袭能力、在宿主细胞间迁移能力及小鼠致病性的影响。【结果】PCR扩增结果显示,试验成功构建了缺失株ΔprsA2和回补株CΔprsA2。生长曲线结果显示,prsA2基因缺失不影响单增李斯特菌在BHI培养基中的生长能力(P>0.05)。Western blotting结果显示,缺失株ΔprsA2细菌表面的InlB锚定量极显著低于10403S和CΔprsA2(P<0.01),细菌培养上清中InlB锚定量极显著高于10403S和CΔprsA2(P<0.01)。细胞试验结果显示,缺失株ΔprsA2对Caco-2细胞的黏附率、侵袭率均极显著低于10403S和CΔprsA2(P<0.01);prsA2基因缺失减弱了单增李斯特菌募集肌动蛋白形成肌动蛋白尾巴在细胞间迁移的能力。小鼠毒力试验结果显示,缺失株ΔprsA2在小鼠肝脏与脾脏中的细菌载量均显著低于10403S和CΔprsA2(P<0.05)。【结论】分子伴侣prsA2基因缺失不影响单增李斯特菌在BHI培养基中的生长能力,但缺失株ΔprsA2表面的InlB锚定量显著下降,缺失prsA2基因减弱单增李斯特菌对Caco-2细胞的黏附侵袭能力、在细胞间迁移能力以及对小鼠的致病性。
胡文洁方小伟郭骞杨雨婷刘晶梁雄燕杨玉莹方春
关键词:单增李斯特菌分子伴侣
仙鹤草-黄连通过调控分子伴侣介导自噬抑制结直肠癌的作用机制
2024年
目的:观察仙鹤草-黄连药对(XHC-HL)对结直肠肿瘤细胞增殖、迁移、侵袭、凋亡及对自噬的影响,并探讨XHC-HL通过调控分子伴侣介导自噬(CMA)抑制结直肠癌的作用机制。方法:制备XHC-HL含药血清,培养人结直肠癌细胞株HT29和LOVO,分为空白组(20%空白血清),XHC-HL组(5%、10%、20%含药血清),5-氟尿嘧啶(5-FU)组。用细胞增殖与活性检测法(CCK-8)检测细胞活力;5-乙炔基-2′-脱氧尿苷(EdU)染色法检测细胞增殖能力;划痕实验及Transwell迁移实验检测细胞迁移能力;Transwell侵袭实验检测细胞侵袭能力;流式细胞术检测细胞凋亡率;蛋白免疫印迹法(Western blot)检测XHC-HL对自噬关键分子酵母Atg6同系物-1(Beclin-1)、微管相关蛋白1轻链3Ⅱ(LC3Ⅱ)及p62的影响;Western blot、实时荧光定量聚合酶链式反应(Real-time PCR)检测XHC-HL对CMA相关蛋白和mRNA影响。结果:与空白组比较,XHC-HL组和5-FU组均能抑制HT-29和LOVO细胞活力(P<0.01)。与空白组比较,XHC-HL组和5-FU组均能够明显抑制HT-29和LOVO细胞的增殖能力(P<0.05,P<0.01)。与空白组比较,XHC-HL组和5-FU组2种细胞迁移率均显著减弱(P<0.01),迁移到下室的数量均显著减少(P<0.01),细胞侵袭个数均降低(P<0.01),细胞凋亡增多(P<0.01)。Western blot结果显示,与空白组比较,XHC-HL组和5-FU组2种细胞中Beclin-1和LC3Ⅱ的表达明显增加(P<0.05,P<0.01),而p62的水平明显降低(P<0.05,P<0.01);与空白组比较,XHC-HL组和5-FU组2种细胞中溶酶体相关膜蛋白2A(LAMP2A)、热休克同源蛋白70(HSC70)、热休克蛋白90(HSP90)蛋白表达量均有不同程度的降低,甘油醛-3-磷酸脱氢酶(GAPDH)表达水平显著增高(P<0.01)。与空白组比较,XHC-HL组和5-FU组2种细胞中LAMP2A、HSC70、HSP90 mRNA水平均下调,GAPDH mRNA表达水平显著上调(P<0.01)。结论:XHC-HL可通过抑制CMA活性,从而抑制结直肠癌细胞的增殖、迁移、侵袭能力,诱导其自噬,并促进细胞凋亡。
何亚萍侯敏艳彭海燕
关键词:结直肠癌
Fluorogenic sensing of amorphous aggregates,amyloid fibers,and chaperone activity via a near-infrared aggregation-induced emission-active probe
2024年
The presence of protein aggregates in numerous human diseases underscores the significance of detecting these aggregates to comprehend disease mechanisms and develop novel therapeutic approaches for combating these disorders.Despite the development of various biosensors and fluorescent probes that selectively target amyloid fibers or amorphous aggregates,there is still a lack of tools capable of simultaneously detecting both types of aggregates.Herein,we demonstrate the quantitative discernment of amorphous aggregates by QM-FN-SO3,an aggregationinduced emission(AIE)probe initially designed for detecting amyloid fibers.This probe easily penetrates the membranes of the widely-used prokaryotic model organism Escherichia coli,enabling the visualization of both amorphous aggregates and amyloid fibers through near-infrared fluorescence.Notably,the probe exhibits sensitivity in distinguishing the varying aggregation propensities of proteins,regardless of whether they form amorphous aggregates or amyloid fibers in vivo.These properties contribute to the successful application of the QM-FN-SO3 probe in the subsequent investigation of the antiaggregation activities of two outer membrane protein(OMP)chaperones,both in vitro and in their physiological environment.Overall,our work introduces a near-infrared fluorescent chemical probe that can quantitatively detect amyloid fibers and amorphous aggregates with high sensitivity in vitro and in vivo.Furthermore,it demonstrates the applicability of the probe in chaperone biology and its potential as a high-throughput screening tool for protein aggregation inhibitors and folding factors.
Wei HeYuanyuan YangYuhui QianZhuoyi ChenYongxin ZhengWenping ZhaoChenxu YanZhiqian GuoShu Quan
Celastrol regulates the oligomeric state and chaperone activity of αB-crystallin linked with protein homeostasis in the lens
2024年
Protein misfolding and aggregation are crucial pathogenic factors for cataracts,which are the leading cause of visual impairment worldwide.α-crystallin,as a small molecular chaperone,is involved in preventing protein misfolding and maintaining lens transparency.The chaperone activity of α-crystallin depends on its oligomeric state.Our previous work identified a natural compound,celastrol,which could regulate the oligomeric state of αB-crystallin.In this work,based on the UNcle and SEC analysis,we found that celastrol induced𝛼αB-crystallin to form large oligomers.Large oligomer formation enhanced the chaperone activity of αB-crystallin and prevented aggregation of the cataract-causing mutant αA3-G91del.The interactions between𝛼αB-crystallin and celastrol were detected by the FRET(Fluorescence Resonance Energy Transfer)technique,and verified by molecular docking.At least 9 binding patterns were recognized,and some binding sites covered the groove structure of αB-crystallin.Interestingly,αB-R120G,a cataract-causing mutation located at the groove structure,and celastrol can decrease the aggregates of αB-R120G.Overall,our results suggested celastrol not only promoted the formation of large αB-crystallin oligomers,which enhanced its chaperone activity,but also bound to the groove structure of its α-crystallin domain to maintain its structural stability.Celastrol might serve as a chemical and pharmacological chaperone for cataract treatment.
Huaxia WangQing TianYing ZhangYibo XiLidan HuKe YaoJingyuan LiXiangjun Chen
关键词:CELASTROLINTERACTIONS

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付新苗
作品数:5被引量:1H指数:1
供职机构:北京大学
研究主题:CHAPERONE AMINO ATP合酶 MAJOR LEVELS
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作品数:72被引量:451H指数:8
供职机构:北京大学生命科学学院
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作品数:17被引量:48H指数:4
供职机构:中国科学院城市环境研究所
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丁伟
作品数:4被引量:11H指数:1
供职机构:中国科学院生物物理研究所
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刘俊
作品数:5被引量:50H指数:3
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