VPS4B(液泡蛋白分选4同源物B)属于AAA ATP酶家族(ATPases Associated with diverse cellular Activities),这是一个广泛参与细胞膜运输、蛋白质降解和细胞器生物发生的蛋白家族。该基因编码的蛋白质主要参与多泡体(MVB)形成和胞内运输过程,通过ESCRT(内体分选复合物运输所需)途径调控膜重塑和囊泡出芽,尤其在细胞分裂、病毒出芽和受损蛋白清除中起关键作用。其表达产物通过水解ATP提供能量,解聚ESCRT-III复合物以完成膜分离。主要作用位点为内体膜和中间体(midbody),在胞质分裂时确保细胞完全分离。突变会导致ESCRT通路功能障碍,引发神经退行性疾病(如帕金森病)和癌症,因受损蛋白积累和异常膜运输。与肿瘤的关系体现在其作为抑癌基因的功能缺失会促进上皮-间质转化(EMT)。过表达时可能增强溶酶体降解途径,但会干扰正常内体运输;低表达则导致多泡体成熟障碍,未降解的受体(如EGFR)持续激活促癌信号。该基因属于VPS4基因家族(含VPS4A和VPS4B),家族共性为具有保守的AAA结构域和微管相互作用域,均参与ESCRT依赖性膜剪切。VPS4B相比VPS4A在精子和神经元中表达更高,二者功能部分冗余但组织分布有差异。最新研究还发现其单核苷酸多态性(SNP)与精神分裂症风险相关,可能通过影响突触囊泡循环发挥作用。
The protein encoded by this gene is a member of the AAA protein family (ATPases associated with diverse cellular activities), and is the homolog of the yeast Vps4 protein. In humans, two paralogs of the yeast protein have been identified. The former share a high degree of aa sequence similarity with each other, and also with yeast Vps4 and mouse Skd1 proteins. Mouse Skd1 (suppressor of K+ transport defect 1) has been shown to be a yeast Vps4 ortholog. Functional studies indicate that both human paralogs associate with the endosomal compartments, and are involved in intracellular protein trafficking, similar to Vps4 protein in yeast. The gene encoding this paralog has been mapped to chromosome 18; the gene for the other resides on chromosome 16. [provided by RefSeq, Jul 2008]
由该基因编码的蛋白质是AAA蛋白家族(与不同的细胞活性相关的ATP酶)的成员,并且是酵母Vps4蛋白的同源物。在人类中,酵母蛋白质两个旁系同源物也已确定。前者共享高度的氨基酸序列相似性的相互,并且还与酵母Vps4和鼠标SKD1蛋白质。鼠标SKD1(K +转运缺陷1的抑制剂)已被证明是一种酵母Vps4直向同源物。功能研究表明人类旁系与内体区室相关联,并且涉及细胞内蛋白质运输,在酵母类似于Vps4蛋白。编码本旁系的基因已被定位于18号染色体;对于其他驻留在16号染色体上的基因[由RefSeq的,2008年7月提供]
VPS4B基因(以及对应的蛋白质)的细胞分布位置:
VPS4B基因的本体(GO)信息:
名称 |
---|
4144 Endocytosis [PATH:hsa04144] |
名称 |
---|
Budding and maturation of HIV virion |
Disease |
Endosomal Sorting Complex Required For Transport (ESCRT) |
HIV Infection |
HIV Life Cycle |
Infectious disease |
Late Phase of HIV Life Cycle |
Membrane Trafficking |
Vesicle-mediated transport |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Diabetic Nephropathy | 0.002367032 | 1 | 0 | GAD |
Malignant neoplasm of breast | 0.000542884 | 2 | 0 | BeFree |
Breast Carcinoma | 0.000542884 | 2 | 0 | BeFree |
Cerebral Infarction | 0.000271442 | 1 | 0 | BeFree |
Non-Small Cell Lung Carcinoma | 0.000271442 | 1 | 0 | BeFree |
Parkinson Disease | 0.000271442 | 1 | 0 | BeFree |
Tumor Progression | 0.000271442 | 1 | 0 | BeFree |
Cerebral Ischemia | 0.000271442 | 1 | 0 | BeFree |
Colitis | 0.000271442 | 1 | 0 | BeFree |
Nephroblastoma | 0.000271442 | 1 | 0 | BeFree |
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