?
Glycerophosphodiester phosphodiesterase domain as found in prokaryota and eukaryota, and similar proteins The typical glycerophosphodiester phosphodiesterase domain (GDPD) consists of a TIM barrel and a small insertion domain named the GDPD-insertion (GDPD-I) domain, which is specific for GDPD proteins. This family corresponds to both typical GDPD domain and GDPD-like domain which lacks the GDPD-I region. Members in this family mainly consist of a large family of prokaryotic and eukaryotic glycerophosphodiester phosphodiesterases (GP-GDEs, EC 3.1.4.46), and a number of uncharacterized homologs. Sphingomyelinases D (SMases D) (sphingomyelin phosphodiesterase D, EC 3.1.4.41) from spider venom, SMases D-like proteins, and phospholipase D (PLD) from several pathogenic bacteria are also included in this family. GDPD plays an essential role in glycerol metabolism and catalyzes the hydrolysis of glycerophosphodiesters to sn-glycerol-3-phosphate (G3P) and the corresponding alcohols are major sources of carbon and phosphate. Its catalytic mechanism is based on the metal ion-dependent acid-base reaction, which is similar to that of phosphoinositide-specific phospholipases C (PI-PLCs, EC 3.1.4.11). Both, GDPD related proteins and PI-PLCs, belong to the superfamily of PI-PLC-like phosphodiesterases.
|