Sphingomyelin phosphodiesterase 3

Up-regulated during G0/G1 phases.

Catalyzes the hydrolysis of sphingomyelin to form ceramide and phosphocholine. Ceramide mediates numerous cellular functions, such as apoptosis and growth arrest, and is capable of regulating these 2 cellular events independently. Also hydrolyzes sphingosylphosphocholine. Regulates the cell cycle by acting as a growth suppressor in confluent cells. Probably acts as a regulator of postnatal development and participates in bone and dentin mineralization (PubMed:10823942, PubMed:14741383, PubMed:15051724). Binds to anionic phospholipids (APLs) such as phosphatidylserine (PS) and phosphatidic acid (PA) that modulate enzymatic activity and subcellular location. May be involved in IL-1-beta-induced JNK activation in hepatocytes (By similarity). May act as a mediator in transcriptional regulation of NOS2/iNOS via the NF-kappa-B activation under inflammatory conditions (By similarity).

Lipid metabolism; sphingolipid metabolism.

Palmitoylated, palmitoylation-deficient proteins are targeted for lysosomal degradation.

Belongs to the neutral sphingomyelinase family.

Predominantly expressed in brain.

• Golgi apparatus membrane
• Lipid-anchor
• Cell membrane
• Lipid-anchor
• May localize to detergent-resistant subdomains of Golgi membranes of hypothalamic neurosecretory neurons (PubMed:10823942). Localizes to plasma membrane in confluent contact-inhaibited cells (PubMed:15051724).

Sphingomyelin phosphodiesterase 3, Neutral sphingomyelinase 2, Neutral sphingomyelinase II, nSMase-2, nSMase2, SMPD3

• entrezGene:55512
• omim:605777
• swissprot:Q9NY59

Proteins

Metabolism

71081Da