Phospholipid-transporting ATPase ABCA7

Expressed in fetal tissues. Strongly expressed in fetal liver.

Catalyzes the translocation of specific phospholipids from the cytoplasmic to the extracellular/lumenal leaflet of membrane coupled to the hydrolysis of ATP (PubMed:24097981). Transports preferentially phosphatidylserine over phosphatidylcholine (PubMed:24097981). Plays a role in lipid homeostasis and macrophage-mediated phagocytosis (PubMed:12917409, PubMed:12925201, PubMed:14570867, PubMed:14592415). Binds APOA1 and may function in apolipoprotein-mediated phospholipid efflux from cells (PubMed:12917409, PubMed:14570867, PubMed:14592415). May also mediate cholesterol efflux (PubMed:14570867). May regulate cellular ceramide homeostasis during keratinocyte differentiation (PubMed:12925201). Involved in lipid raft organization and CD1D localization on thymocytes and antigen-presenting cells, which plays an important role in natural killer T-cell development and activation (By similarity). Plays a role in phagocytosis of apoptotic cells by macrophages (By similarity). Macrophage phagocytosis is stimulated by APOA1 or APOA2, probably by stabilization of ABCA7 (By similarity). Also involved in phagocytic clearance of amyloid-beta by microglia cells and macrophages (By similarity). Further limits amyloid-beta production by playing a role in the regulation of amyloid-beta A4 precursor protein (APP) endocytosis and/or processing (PubMed:26260791). Amyloid-beta is the main component of amyloid plaques found in the brains of Alzheimer patients (PubMed:26260791).

Alzheimer disease 9

AD9

A familial, late-onset form of Alzheimer disease. Alzheimer disease is a neurodegenerative disorder characterized by progressive dementia, loss of cognitive abilities, and deposition of fibrillar amyloid proteins as intraneuronal neurofibrillary tangles, extracellular amyloid plaques and vascular amyloid deposits. The major constituents of these plaques are neurotoxic amyloid-beta protein 40 and amyloid-beta protein 42, that are produced by the proteolysis of the transmembrane APP protein. The cytotoxic C-terminal fragments (CTFs) and the caspase-cleaved products, such as C31, are also implicated in neuronal death.

None

Disease susceptibility is associated with variants affecting the gene represented in this entry.

N-glycosylated.

Belongs to the ABC transporter superfamily. ABCA family.

Expressed in leukocytes (at protein level) (PubMed:10873640). Widely expressed (PubMed:10873640). Highly expressed in myelo-lymphatic tissues including peripheral leukocytes, thymus, spleen and bone marrow (PubMed:10873640, PubMed:11435699). Expressed in the hippocampus and the cerebellum (PubMed:27472885). Isoform 2: Abundant in lymph node, spleen, thymus and trachea (PubMed:14592415). Isoform 1: Strongly expressed in brain and bone marrow (PubMed:14592415).

• Cell membrane
• Multi-pass membrane protein
• Golgi apparatus membrane
• Multi-pass membrane protein
• Early endosome membrane
• Multi-pass membrane protein
• Cytoplasm
• Cell projection
• Ruffle membrane
• Cell projection
• Phagocytic cup
• Localizes to cell membrane ruffles and phagocytic cups of macrophages stimulated with C1q or apoptotic cells. Localizes to the cytoplasm of resting macrophages, probably in Golgi and endosomes. Localizes to the apical brush border of cells in the proximal tubules of kidney (By similarity).
• Isoform 2
• Cytoplasm
• Endoplasmic reticulum
• May localize to the endoplasmic reticulum.

Phospholipid-transporting ATPase ABCA7, ABCA-SSN, ATP-binding cassette sub-family A member 7, Autoantigen SS-N, Macrophage ABC transporter, ABCA7

• entrezGene:10347
• omim:605414
• swissprot:Q8IZY2

Proteins

Neuroscience

234350Da