SRI基因(也称为Sorcin)编码一种钙结合蛋白,属于penta-EF-hand(PEF)蛋白家族。该家族成员通常具有EF-hand结构域(一种钙离子结合模体),参与钙信号传导和细胞过程调控。SRI蛋白的主要功能是通过结合钙离子调节细胞内钙稳态,影响多种生理活动,如肌肉收缩、神经传递和分泌过程。其表达产物在心脏、骨骼肌和脑组织中较为丰富,作用位点包括内质网和细胞膜等钙储存或释放相关区域。SRI通过与ryanodine受体(RyR,一种钙释放通道)等靶蛋白相互作用,抑制过度钙释放,从而防止钙超载导致的心律失常或细胞凋亡。突变可能导致SRI钙结合能力异常,例如错义突变D150G会削弱其抑制RyR的能力,与家族性心室颤动和心肌病相关。在癌症中,SRI过表达常见于多药耐药肿瘤细胞,它通过结合并稳定抗凋亡蛋白(如Bcl-2)促进细胞存活;而敲低SRI可增强化疗敏感性。该基因还参与阿尔茨海默病病理,其表达降低会加剧β-淀粉样蛋白毒性引起的钙失调。基因家族共性方面,PEF家族成员(如ALG-2、Peflin)均含5个EF-hand结构域,但第5个常不结合钙离子,它们多参与膜 trafficking(膜运输)、细胞凋亡和蛋白酶体调控。过表达SRI可能通过抑制calpain(钙依赖性蛋白酶)减轻缺血再灌注损伤,但也会因过度抑制钙信号导致肌肉收缩功能障碍;表达不足则可能引发线粒体钙超载和氧化应激。在与其他基因的互作中,SRI可调控ANXA7(膜修复蛋白)的定位,并受miR-1/miR-206调控,这些microRNA的异常表达会间接影响SRI在心血管疾病中的作用。
This gene encodes a calcium-binding protein with multiple E-F hand domains that relocates from the cytoplasm to the sarcoplasmic reticulum in response to elevated calcium levels. In addition to regulating intracellular calcium homeostasis it also modulates excitation-contraction coupling in the heart. Alternative splicing results in multiple transcript variants encoding distinct proteins. Multiple pseudogenes exist for this gene. [provided by RefSeq, Mar 2012]
Subcellular localization of SRI (and its protein):
Gene Ontology (GO) terms for SRI:
| Interacting Gene | Interaction | Source/Score |
| Name |
|---|
| Ion channel transport |
| Stimuli-sensing channels |
| Transmembrane transport of small molecules |
| Disease | Score | NofPmids | NofSnps | Source |
| Heart failure | 0.080271442 | 3 | 0 | BeFree_RGD |
| Leukemia, Myelocytic, Acute | 0.006534468 | 4 | 0 | BeFree_LHGDN |
| leukemia | 0.003538676 | 4 | 0 | BeFree_LHGDN |
| Severe congenital neutropenia | 0.001085767 | 4 | 0 | BeFree |
| Congenital neutropenia | 0.001085767 | 4 | 0 | BeFree |
| Osteochondritis Dissecans | 0.000542884 | 2 | 0 | BeFree |
| Obsessive-Compulsive Disorder | 0.000542884 | 2 | 0 | BeFree |
| Cardiomyopathies | 0.000542884 | 2 | 0 | BeFree |
| Inherited neuropathies | 0.000271442 | 1 | 0 | BeFree |
| Acute Erythroblastic Leukemia | 0.000271442 | 1 | 0 | BeFree |
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