SEC13是一个高度保守的基因，属于COPII（coat protein complex II）囊泡运输复合体基因家族。该家族主要负责内质网（ER）到高尔基体的蛋白质转运，这是细胞内蛋白质分泌和膜运输的关键步骤。SEC13编码的蛋白质是COPII复合体的核心组分，与其他蛋白质（如SEC31和SEC23/SEC24）共同形成外被小泡，帮助新合成的蛋白质从内质网运出。SEC13蛋白的结构特点是含有WD40重复结构域（一种常见的蛋白质相互作用模块），这使得它能稳定COPII复合体的组装。SEC13的功能突变可能导致内质网应激（ER stress），因为未正确折叠或未转运的蛋白质会积累在内质网中，进而引发未折叠蛋白反应（UPR）。这种突变与某些遗传性疾病相关，如先天性糖基化障碍（CDG）和某些肝脏疾病。SEC13的过表达可能增强分泌途径的效率，但过度活跃的转运可能导致内质网膜耗竭或高尔基体功能紊乱。相反，SEC13表达降低会损害COPII复合体的形成，导致蛋白质转运阻滞，影响细胞分泌功能，甚至引发细胞凋亡。此外，SEC13在血管生成中也有作用，其表达异常可能与肿瘤血管形成（肿瘤 angiogenesis）相关。SEC13基因家族（COPII相关基因）的共性在于它们都参与调控囊泡出芽、运输和膜动态平衡，对维持细胞内膜系统功能至关重要。研究还发现SEC13与某些神经退行性疾病（如阿尔茨海默病）有关，因为蛋白质转运缺陷可能导致毒性蛋白聚集。总的来说，SEC13在细胞生理和病理过程中扮演多重角色，其表达水平需精确调控以确保正常的细胞功能。

由该基因编码的蛋白质属于SEC13家庭WD重复蛋白质。它是内质网和核孔复合物的成分。它具有相似性的酵母SEC13蛋白，这是蛋白质的运输过程中需要从内质网囊泡生物合成。多重选择性剪接转录变异体已被发现。 [由RefSeq的，2008年10月提供]

SEC13 is a highly conserved gene encoding a core structural component of the COPII (coat protein complex II) vesicular transport machinery, which governs the critical anterograde trafficking of newly synthesized proteins from the endoplasmic reticulum (ER) to the Golgi apparatus. The SEC13 protein, characterized by the presence of WD40 repeat domains that serve as versatile protein-protein interaction modules, stabilizes the assembly of the COPII coat alongside other essential subunits such as SEC31 and the SEC23/SEC24 heterodimer, thereby facilitating the budding of transport vesicles from the ER membrane. Proper function of this complex is vital for maintaining cellular homeostasis; consequently, loss-of-function mutations in SEC13 can lead to the accumulation of misfolded or untransported proteins within the ER, triggering the unfolded protein response (UPR) and ER stress. Such defects have been implicated in the pathogenesis of congenital disorders of glycosylation (CDG) and certain hepatic diseases, while also contributing to neurodegenerative conditions like Alzheimer’s disease through the failure to clear toxic protein aggregates. Conversely, dysregulated expression of SEC13, whether through overexpression that may cause ER membrane depletion and Golgi dysfunction or through downregulation that impairs vesicle formation and secretion, can compromise cellular viability and potentially induce apoptosis. Beyond its canonical role in the secretory pathway, SEC13 is also involved in vascular biology, where its aberrant expression has been linked to tumor angiogenesis, highlighting its multifaceted role in maintaining membrane dynamics and its significance in both physiological and pathological contexts.

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