Knock-Out of ACBD3 Leads to Dispersed Golgi Structure, but Unaffected Mitochondrial Functions in HEK293 and HeLa Cells

International Journal of Molecular Sciences

Hana Štufková¹  Markéta Tesařová¹  Lucie Zdražilová¹  Tereza Daňhelovská¹  Nikol Volfová¹  Jana Křížová¹  Jana Sládková¹  Marie Vanišová¹  Ondřej Kuda² 

[1] Department of Paediatrics and Inherited Metabolic Disorders, Charles University, First Faculty of Medicine and General University Hospital in Prague, 128 01 Prague, Czech Republic;Institute of Physiology, Academy of Sciences of the Czech Republic, 142 00 Prague, Czech Republic;

关键词: ACBD3;    mitochondria;    cholesterol;    Golgi;    OXPHOS;    knock-out;   

DOI  :  10.3390/ijms22147270

来源: DOAJ

【 摘 要 】

The Acyl-CoA-binding domain-containing protein (ACBD3) plays multiple roles across the cell. Although generally associated with the Golgi apparatus, it operates also in mitochondria. In steroidogenic cells, ACBD3 is an important part of a multiprotein complex transporting cholesterol into mitochondria. Balance in mitochondrial cholesterol is essential for proper mitochondrial protein biosynthesis, among others. We generated ACBD3 knock-out (ACBD3-KO) HEK293 and HeLa cells and characterized the impact of protein absence on mitochondria, Golgi, and lipid profile. In ACBD3-KO cells, cholesterol level and mitochondrial structure and functions are not altered, demonstrating that an alternative pathway of cholesterol transport into mitochondria exists. However, ACBD3-KO cells exhibit enlarged Golgi area with absence of stacks and ribbon-like formation, confirming the importance of ACBD3 in Golgi stacking. The glycosylation of the LAMP2 glycoprotein was not affected by the altered Golgi structure. Moreover, decreased sphingomyelins together with normal ceramides and sphingomyelin synthase activity reveal the importance of ACBD3 in ceramide transport from ER to Golgi.

【 授权许可】

Unknown