| 2011 |
CDC50A is the obligate β-subunit of the P4-ATPase ATP8A2; the two proteins form a heteromeric complex (confirmed by mass spectrometry and Western blotting from native photoreceptor membranes and HEK293T co-expression). CDC50A is required for correct folding, stable expression, ER export, and phosphatidylserine/phosphatidylethanolamine flippase activity of ATP8A2. Both the transmembrane and exocytoplasmic domains of CDC50A are required for a functional complex, the N-terminal cytoplasmic domain participates directly in the reaction cycle, and N-linked glycosylation of CDC50A is required for stable expression of an active complex. |
Mass spectrometry, Western blotting, co-immunoprecipitation, heterologous co-expression in HEK293T, chimera/domain-swap analysis, mutagenesis of glycosylation sites, reconstituted lipid transport assay |
The Journal of biological chemistry |
High |
21454556
|
| 2012 |
CDC50A associates with P4-ATPase ATP8A1 and recruits it to the plasma membrane. In CHO cells, CDC50A is the sole CDC50 family member expressed. CDC50A overexpression induces cell spreading and enhances cell migration; depletion of CDC50A abolishes inward translocation of both phosphatidylserine (PS) and phosphatidylethanolamine (PE) at the plasma membrane, inhibits membrane ruffle formation, and severely impairs cell migration. Depletion of ATP8A1 specifically inhibits PE (but not PS) translocation, indicating that the CDC50A–ATP8A1 flippase complex drives PE-dependent ruffle formation for cell migration. |
Co-immunoprecipitation, siRNA knockdown, overexpression, fluorescent phospholipid translocation assay, confocal microscopy, cell migration assay, PE-binding peptide and PE-synthesis-deficient mutant cell line |
The Journal of biological chemistry |
High |
23269685
|
| 2017 |
The extracellular domain of CDC50A is required both for chaperoning P4-ATPases (ATP11C and others) to the plasma membrane and for inducing ATP11C's ATP hydrolysis-coupled flippase activity. Error-prone PCR mutagenesis identified 14 evolutionarily conserved residues in the extracellular domain whose mutation either disrupts stable complex formation with ATP11C or, in one case, permits stable complex formation and membrane delivery yet abolishes PtdSer/PtdEtn-dependent ATPase activity. |
Error-prone PCR mutagenesis of CDC50A, functional screening, deep sequencing, stable complex formation assay, PtdSer-dependent ATPase activity assay, plasma membrane trafficking assay |
The Journal of biological chemistry |
High |
29276178
|
| 2011 |
Human TMEM30A (CDC50A) functionally complements yeast Δlem3 for choline phospholipid import, confirming orthology. In mammalian cells, TMEM30A-GFP localizes to plasma membranes and internal organelles; ectopic TMEM30A expression promotes uptake of exogenous choline and ethanolamine phospholipids (including PAF and Edelfosine), and shRNA knockdown reduces fluorescent phospholipid and [³H]PAF import and reduces apoptosis in response to these lipids. |
Yeast complementation assay (Δlem3 rescue), TMEM30A-GFP localization by confocal microscopy, shRNA knockdown, fluorescent lipid uptake assay, [³H]PAF import assay, mitochondrial depolarization and apoptosis assays |
Journal of immunology |
High |
21289302
|
| 2010 |
CDC50A localizes to the endoplasmic reticulum and Golgi in both sensitive and resistant KB cells, but additionally traffics to early/late endosomes and the plasma membrane only in perifosine-sensitive KB cells. Co-expression of CDC50A with P4-ATPase ATP8B1 re-routes CDC50A to the plasma membrane and dramatically increases aminophospholipid and perifosine uptake in HeLa and HEK293T cells that otherwise retain CDC50A in ER/Golgi. |
Confocal microscopy, cell-surface biotinylation, co-expression with ATP8B1, fluorescent aminophospholipid uptake assay, perifosine uptake assay, overexpression and knockdown |
Biochemical pharmacology |
Medium |
20510206
|
| 2012 |
ATP8A2 and CDC50A act synergistically in neurite outgrowth: Atp8a2 mRNA is highly expressed in PC12 cells, hippocampal neurons, and brain; overexpression of ATP8A2 increases neurite length in NGF-stimulated PC12 cells and primary hippocampal neurons; RNAi-mediated CDC50A loss-of-function reduces neurite outgrowth in hippocampal neurons; co-overexpression of CDC50A and ATP8A2 enhances NGF-induced neurite outgrowth beyond either alone. |
RT-PCR expression analysis, plasmid overexpression, RNAi knockdown, neurite length measurement in PC12 cells and primary hippocampal neurons |
FEBS letters |
Medium |
22641037
|
| 2014 |
Endogenous ATP8B1 forms a functional heterodimer with CDC50A in intestinal Caco-2 cells (confirmed by co-immunoprecipitation). Depletion of ATP8B1 impairs apical membrane insertion of SLC10A2 (ASBT bile acid transporter), reducing its surface localization and bile salt uptake. |
Co-immunoprecipitation of endogenous proteins, siRNA knockdown, apical membrane biotinylation, bile salt uptake assay |
Biochimica et biophysica acta |
Medium |
25239307
|
| 2012 |
CDC50A is a terminally glycosylated glycoprotein that resides in detergent-resistant membranes of hepatocytes and liver sinusoidal endothelial cells; in pancreas and stomach it localizes to secretory vesicles; in kidney it localizes to the apical region of proximal convoluted tubules; in WIF-B9 cells it partially co-stains with the trans-Golgi network. These localizations were determined with validated anti-CDC50A antibodies. |
Immunohistochemistry/immunofluorescence with validated antibodies, detergent-resistant membrane fractionation, tissue-specific localization in multiple organs |
The journal of histochemistry and cytochemistry |
Medium |
22253360
|
| 2017 |
Loss of Tmem30a in mouse cone photoreceptors causes mislocalization of ATP8A2 to the inner segment and cell body (instead of outer segment), diminished PS flippase activity, increased PS exposure on the cell surface, loss of photopic ERG responses, and cone cell death. In MEFs from Tmem30a-mutant mice, PS flippase activity is directly reduced. |
Retinal-specific conditional knockout mouse model, immunofluorescence (ATP8A2 localization), electroretinography, in vitro PS flippase activity assay in MEFs, cell surface PS exposure assay (Annexin V staining), TUNEL |
Scientific reports |
High |
28839191
|
| 2018 |
CDC50A acts as a co-factor for the Plasmodium guanylate cyclase β (GCβ): CDC50A binds to and stabilizes GCβ during ookinete development. The GCβ/CDC50A complex is anchored at the ookinete extrados site (OES) by inner membrane complex protein ISP1, and this spatial polarization is required for initiation of ookinete gliding motility. |
Real-time live imaging of GCβ translocation, genetic deletion/complementation in Plasmodium yoelii, co-immunoprecipitation of GCβ and CDC50A, ISP1 interaction screen, domain deletion analysis |
Current biology |
Medium |
30146157
|
| 2018 |
Deletion of Tmem30a in hematopoietic cells impairs erythropoietin receptor (EPOR) localization to membrane raft microdomains and reduces EPOR-mediated STAT5 pathway activation, thereby causing increased apoptosis of erythroid cells and severe anemia. TMEM30A knockdown in human CD34+ cells also impairs erythropoiesis. |
Vav-Cre conditional knockout mice, confocal microscopy of EPOR membrane raft localization, Western blotting of STAT5 phosphorylation, erythroid colony assay, TUNEL, shRNA knockdown in human CD34+ cells |
Haematologica |
Medium |
30819915
|
| 2018 |
TMEM30A physically interacts with the β-carboxyl-terminal fragment (βCTF) of APP in endosomes, and this interaction is associated with endosomal enlargement, impaired APP/βCTF vesicular traffic, accumulation of APP-CTFs, and increased Aβ production in cells with expressed BACE1. |
Co-immunoprecipitation of TMEM30A and βCTF, confocal co-localization in endosomes, overexpression and knockdown approaches, ELISA for Aβ production |
PloS one |
Low |
30086173
|
| 2019 |
TMEM30A knockdown in primary human retinal endothelial cells reduces tube formation; endothelial-specific Tmem30a deletion in mice causes retarded retinal vascular development with hyperpruned vascular network, impaired vessel barrier integrity, and reduced EC proliferation. Mechanistically, TMEM30A deletion reduces VEGF-induced signaling in endothelial cells. |
siRNA knockdown in human retinal endothelial cells (tube formation assay), Cdh5-Cre conditional knockout mice, retinal flat-mount imaging, BrdU/EdU proliferation assay, VEGF signaling Western blotting |
Journal of cell science |
Medium |
30814335
|
| 2021 |
Murine CDC50A localizes to synapses in a neuronal-activity-dependent manner. Cdc50a knockdown causes PS exposure at synapses, which triggers erroneous synapse removal by microglia partly through the GPR56 pathway, leading to synapse loss. |
Immunofluorescence localization of CDC50A at synapses, Annexin V staining for PS exposure, Cdc50a knockdown, microglial phagocytosis assay, genetic epistasis with GPR56 pathway |
The EMBO journal |
Medium |
34585770
|
| 2021 |
Deletion of CDC50A in mouse C2C12 myoblasts abolishes aminophospholipid flippase activity, impairs actin remodeling, prevents RAC1 GTPase membrane targeting, and blocks cell fusion into multinucleated myotubes. By contrast, deletion of the P4-ATPase ATP11A affects aminophospholipid uptake but does not strongly impair cell fusion, indicating that CDC50A-dependent flippases beyond ATP11A mediate fusion. |
CRISPR-Cas9 knockout of CDC50A and ATP11A in C2C12 cells, fluorescent aminophospholipid translocation assay, RAC1 membrane fractionation, actin staining, myoblast fusion assay |
Journal of cell science |
Medium |
34664668
|
| 2021 |
Conditional knockout of Tmem30a in pancreatic β-cells impairs clathrin-mediated vesicle budding at the trans-Golgi network, blocking immature secretory granule (ISG) formation and insulin maturation, and also prevents transport of glucose transporter GLUT2 to the plasma membrane, resulting in hyperglycemia and defective glucose-stimulated insulin secretion. |
Pancreatic β-cell-specific conditional KO mice, electron microscopy of secretory granules, insulin processing assays, GLUT2 membrane fractionation, clathrin colocalization by immunofluorescence, glucose tolerance tests |
Molecular therapy |
Medium |
33895325
|
| 2020 |
TMEM30A loss-of-function (biallelic mutations) in DLBCL cells increases accumulation of chemotherapy drugs in tumor cells, increases tumor-associated macrophages and enhances anti-CD47 blockade efficacy (due to increased PS surface exposure as 'eat-me' signal), and increases B-cell signaling following antigen stimulation—conferring selective advantage during lymphoma development. |
Genomic sequencing of DLBCL cohort, TMEM30A-knockout cell lines and primary cells, drug accumulation assay, macrophage phagocytosis assay, anti-CD47 blockade in vivo, B-cell receptor signaling assays |
Nature medicine |
Medium |
32094924
|
| 2024 |
TMEM30A knockout leukemia/lymphoma cells show increased surface PS, which engages the inhibitory NK cell receptor TIM-3, reducing NK cell degranulation, cytokine production, and cytotoxicity. Blockade of PS or genetic disruption of TIM-3 in NK cells restores killing of TMEM30A-KO cells. |
Genome-wide CRISPR screen, TMEM30A KO in multiple cell lines, PS surface staining (Annexin V), NK cell degranulation and cytokine assays, TIM-3 blockade antibody, CRISPR deletion of TIM-3 in primary NK cells |
Proceedings of the National Academy of Sciences |
Medium |
38557174
|
| 2025 |
CDC50A mutations D193G/K319E in the extracellular domain compromise ATP11c flippase activity, reducing PS redistribution by ~60%. NDV exploits the ATP11c-CDC50A complex: CRISPR-Cas9 ATP11c knockout reduces PS flipping efficiency and impairs NDV replication and progeny virion release. NDV-induced PS externalization enhances matrix (M) protein clustering at PS-rich membrane domains, increasing virus-like particle production. |
CRISPR-Cas9 KO of ATP11c, CDC50A site-directed mutagenesis (D193G/K319E), PS flipping assay, NDV replication/titer assay, virus-like particle production assay, confocal imaging of M protein clustering |
The Journal of biological chemistry |
Medium |
40812423
|
| 2024 |
METTL3-mediated m6A methylation modification of TMEM30A positively regulates TMEM30A expression. Elevated TMEM30A in oral squamous cell carcinoma modulates cellular ATP and lactate metabolic balance. |
m6A methylation detection, METTL3 knockdown/overexpression, TMEM30A expression assays (RT-PCR, Western blot), ATP and lactate metabolic assays |
Life sciences |
Low |
39389339
|
| 2024 |
TMEM30A is required for MNV (murine norovirus) replication: TMEM30A-deficient intestinal epithelial cells prevent persistent enteric MNV infection in vivo. Mechanistically, TMEM30A maintains a lipid-ordered membrane state that is necessary for low-affinity, high-avidity MNV binding and entry; exoplasmic PS (elevated upon TMEM30A loss) does not inhibit MNV infection. |
TMEM30A CRISPR KO in cell lines and mouse intestinal epithelial cells (conditional), MNV binding/entry assay, membrane fluidity/order measurements, in vivo infection model |
bioRxivpreprint |
Low |
bio_10.1101_2024.11.06.622376
|
| 2023 |
TMEM30A knockdown in mouse renal tubular epithelial cells (TCMK-1) reduces vesicle transporter protein synthesis, leading to reduced transport and surface expression of SGLT2 and consequently decreased glucose absorption. |
shRNA knockdown of TMEM30A in TCMK-1 cells, Western blotting of SGLT2, glucose uptake assay |
BMC nephrology |
Low |
37612668
|