PSMB2(蛋白酶体亚基β2型)是蛋白酶体20S核心颗粒的一个组成部分,属于蛋白酶体β亚基家族。蛋白酶体是一种大型蛋白质复合物,主要负责降解细胞内错误折叠或受损的蛋白质,以及调控细胞周期、信号传导和免疫反应等重要过程。PSMB2与其他β亚基(如PSMB1、PSMB5等)共同形成蛋白酶体的催化核心,负责蛋白质的切割和降解。PSMB2的突变可能影响蛋白酶体的正常功能,导致蛋白质稳态失衡,进而引发神经退行性疾病(如阿尔茨海默病、帕金森病)或癌症等疾病。如果PSMB2过表达,可能会增强蛋白质降解能力,影响细胞周期调控,甚至促进肿瘤细胞的增殖和存活;而降低表达则可能导致错误蛋白积累,触发细胞凋亡或自噬。PSMB2所在的蛋白酶体β亚基家族成员均具有类似的蛋白质水解功能,并在维持细胞内蛋白质稳态中发挥关键作用。此外,PSMB2在免疫系统中也扮演重要角色,通过参与抗原呈递过程影响MHC I类分子的生成,从而调控T细胞免疫应答。因此,PSMB2的功能异常可能与自身免疫性疾病或感染性疾病的发病机制相关。
The proteasome is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. The core structure is composed of 4 rings of 28 non-identical subunits; 2 rings are composed of 7 alpha subunits and 2 rings are composed of 7 beta subunits. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. An essential function of a modified proteasome, the immunoproteasome, is the processing of class I MHC peptides. This gene encodes a member of the proteasome B-type family, also known as the T1B family, that is a 20S core beta subunit. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Dec 2010]
蛋白酶体是一个multicatalytic蛋白酶复杂与高度有序的环形20S核心结构。核心结构是由4个环,28个非相同亚基组成; 2环由7个α亚和2环由7个β亚基。蛋白酶在整个真核细胞中分布以高浓度和裂开的肽在一个ATP /泛素依赖的过程在非溶酶体途径。修饰的蛋白酶,免疫蛋白酶,的一个重要功能是MHC I类肽的处理。该基因编码的蛋白酶B型家族的成员,也称为T1B家族,这是一个20S核心β亚基。已发现该基因编码不同亚型多重选择性剪接转录变异体。 [由RefSeq的,2010年12月提供]
PSMB2基因(以及对应的蛋白质)的细胞分布位置:
PSMB2基因的本体(GO)信息:
| 名称 |
|---|
| 3050 Proteasome [PATH:hsa03050] |
| 名称 |
|---|
| Activation of APC/C and APC/C:Cdc20 mediated degradation of mitotic proteins |
| Activation of NF-kappaB in B cells |
| Adaptive Immune System |
| Antigen processing-Cross presentation |
| Antigen processing: Ubiquitination & Proteasome degradation |
| APC:Cdc20 mediated degradation of cell cycle proteins prior to satisfation of the cell cycle checkpoint |
| APC/C-mediated degradation of cell cycle proteins |
| APC/C:Cdc20 mediated degradation of mitotic proteins |
| APC/C:Cdc20 mediated degradation of Securin |
| APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 |
| Apoptosis |
| Assembly of the pre-replicative complex |
| Asymmetric localization of PCP proteins |
| AUF1 (hnRNP D0) destabilizes mRNA |
| Autodegradation of Cdh1 by Cdh1:APC/C |
| Autodegradation of the E3 ubiquitin ligase COP1 |
| beta-catenin independent WNT signaling |
| C-type lectin receptors (CLRs) |
| Cdc20:Phospho-APC/C mediated degradation of Cyclin A |
| CDK-mediated phosphorylation and removal of Cdc6 |
| CDT1 association with the CDC6:ORC:origin complex |
| Cell Cycle |
| Cell Cycle Checkpoints |
| Cell Cycle, Mitotic |
| Class I MHC mediated antigen processing & presentation |
| CLEC7A (Dectin-1) signaling |
| Cross-presentation of soluble exogenous antigens (endosomes) |
| Cyclin A:Cdk2-associated events at S phase entry |
| Cyclin E associated events during G1/S transition |
| Dectin-1 mediated noncanonical NF-kB signaling |
| degradation of AXIN |
| Degradation of beta-catenin by the destruction complex |
| degradation of DVL |
| Degradation of GLI1 by the proteasome |
| Degradation of GLI2 by the proteasome |
| Disease |
| Diseases of signal transduction |
| DNA Replication |
| DNA Replication Pre-Initiation |
| Downstream signaling events of B Cell Receptor (BCR) |
| ER-Phagosome pathway |
| G1/S DNA Damage Checkpoints |
| G1/S Transition |
| Gene Expression |
| GLI3 is processed to GLI3R by the proteasome |
| Hedgehog 'off' state |
| Hedgehog 'on' state |
| Hedgehog ligand biogenesis |
| Hh mutants abrogate ligand secretion |
| Hh mutants that don't undergo autocatalytic processing are degraded by ERAD |
| HIV Infection |
| Host Interactions of HIV factors |
| Immune System |
| Infectious disease |
| Innate Immune System |
| M Phase |
| M/G1 Transition |
| Metabolism of amino acids and derivatives |
| Mitotic Anaphase |
| Mitotic G1-G1/S phases |
| Mitotic Metaphase and Anaphase |
| Orc1 removal from chromatin |
| p53-Dependent G1 DNA Damage Response |
| p53-Dependent G1/S DNA damage checkpoint |
| p53-Independent DNA Damage Response |
| p53-Independent G1/S DNA damage checkpoint |
| PCP/CE pathway |
| Programmed Cell Death |
| Regulation of activated PAK-2p34 by proteasome mediated degradation |
| Regulation of APC/C activators between G1/S and early anaphase |
| Regulation of Apoptosis |
| Regulation of DNA replication |
| Regulation of mitotic cell cycle |
| Regulation of mRNA stability by proteins that bind AU-rich elements |
| Regulation of ornithine decarboxylase (ODC) |
| Removal of licensing factors from origins |
| S Phase |
| SCF-beta-TrCP mediated degradation of Emi1 |
| SCF(Skp2)-mediated degradation of p27/p21 |
| Separation of Sister Chromatids |
| Signaling by Hedgehog |
| Signaling by the B Cell Receptor (BCR) |
| Signaling by Wnt |
| Stabilization of p53 |
| Switching of origins to a post-replicative state |
| Synthesis of DNA |
| TCF dependent signaling in response to WNT |
| Ubiquitin Mediated Degradation of Phosphorylated Cdc25A |
| Ubiquitin-dependent degradation of Cyclin D |
| Ubiquitin-dependent degradation of Cyclin D1 |
| Vif-mediated degradation of APOBEC3G |
| Vpu mediated degradation of CD4 |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Bladder Neoplasm | 0.12 | 1 | 0 | CTD_human |
| Glomerular filtration rate finding | 0.002367032 | 1 | 1 | GAD |
| Central neuroblastoma | 0.000271442 | 1 | 0 | BeFree |
| Exanthema | 0.000271442 | 1 | 0 | BeFree |
| Neuroblastoma | 0.000271442 | 1 | 0 | BeFree |
| Spots on skin | 0.000271442 | 1 | 0 | BeFree |
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