FUNCTION: Major sphingomyelin synthase at the Golgi apparatus (PubMed:17449912, PubMed:14685263). Catalyzes the reversible transfer of phosphocholine moiety in sphingomyelin biosynthesis: in the forward reaction transfers phosphocholine head group of phosphatidylcholine (PC) on to ceramide (CER) to ...
FUNCTION: Major sphingomyelin synthase at the Golgi apparatus (PubMed:17449912, PubMed:14685263). Catalyzes the reversible transfer of phosphocholine moiety in sphingomyelin biosynthesis: in the forward reaction transfers phosphocholine head group of phosphatidylcholine (PC) on to ceramide (CER) to form ceramide phosphocholine (sphingomyelin, SM) and diacylglycerol (DAG) as by-product, and in the reverse reaction transfers phosphocholine from SM to DAG to form PC and CER. The direction of the reaction depends on the levels of CER and DAG in Golgi membranes (PubMed:14685263, PubMed:17449912, PubMed:14976195, PubMed:17982138, PubMed:19454763). Does not use free phosphorylcholine or CDP-choline as donor (PubMed:14976195, PubMed:14685263). Regulates receptor-mediated signal transduction via mitogenic DAG and proapoptotic CER, as well as via SM, a structural component of membrane rafts that serve as platforms for signal transduction and protein sorting (PubMed:14976195, PubMed:17449912, PubMed:17982138). Plays a role in secretory transport via regulation of DAG pool at the Golgi apparatus and its downstream effects on PRKD1 (PubMed:18370930, PubMed:21980337). {ECO:0000269|PubMed:14685263, ECO:0000269|PubMed:14976195, ECO:0000269|PubMed:17449912, ECO:0000269|PubMed:17982138, ECO:0000269|PubMed:18370930, ECO:0000269|PubMed:19454763, ECO:0000269|PubMed:21980337}.
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GO - Biological processes (BP):
apoptotic process [GO:0006915]; ceramide biosynthetic process [GO:0046513]; regulation of intrinsic apoptotic signaling pathway [GO:2001242]; sphingolipid biosynthetic process [GO:0030148]; sphingomyelin biosynthetic process [GO:0006686]...
apoptotic process [GO:0006915]; ceramide biosynthetic process [GO:0046513]; regulation of intrinsic apoptotic signaling pathway [GO:2001242]; sphingolipid biosynthetic process [GO:0030148]; sphingomyelin biosynthetic process [GO:0006686]
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GO - Molecular function (MF):
ceramide cholinephosphotransferase activity [GO:0047493]; ceramide phosphoethanolamine synthase activity [GO:0002950]; kinase activity [GO:0016301]; sphingomyelin synthase activity [GO:0033188]...
ceramide cholinephosphotransferase activity [GO:0047493]; ceramide phosphoethanolamine synthase activity [GO:0002950]; kinase activity [GO:0016301]; sphingomyelin synthase activity [GO:0033188]
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GO - Cellular component (CC):
endoplasmic reticulum [GO:0005783]; Golgi membrane [GO:0000139]; Golgi trans cisterna [GO:0000138]; integral component of endoplasmic reticulum membrane [GO:0030176]; integral component of Golgi membrane [GO:0030173]; integral component of plasma membrane [GO:0005887]; membrane [GO:0016020]; nucleus...
endoplasmic reticulum [GO:0005783]; Golgi membrane [GO:0000139]; Golgi trans cisterna [GO:0000138]; integral component of endoplasmic reticulum membrane [GO:0030176]; integral component of Golgi membrane [GO:0030173]; integral component of plasma membrane [GO:0005887]; membrane [GO:0016020]; nucleus [GO:0005634]; plasma membrane [GO:0005886]
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