Glycerophosphodiester phosphodiesterase domain similar to Escherichia coli periplasmic phosphodiesterase (GlpQ) include uncharacterized proteins
This subfamily corresponds to the glycerophosphodiester phosphodiesterase domain (GDPD) present in a group of uncharacterized glycerophosphodiester phosphodiesterases (GP-GDE, EC 220.127.116.11) and their hypothetical homologs. Members in this subfamily show high sequence similarity to Escherichia coli periplasmic phosphodiesterase GlpQ, which catalyzes the Ca2+-dependent degradation of periplasmic glycerophosphodiesters to produce sn-glycerol-3-phosphate (G3P) and the corresponding alcohols.
Comment:The catalytic mechanism of glycerophosphodiester phosphodiesterases is based on the metal ion-dependent general acid-base reaction.
Comment:Based on structure evidence and site-directed mutagenesis of Thermoanaerobacter tengcongensis glycerophosphodiester phosphodiesterase, the catalytic site consists of two conserved histidine residues which serve as general acid and general base in catalyzing the hydrolysis of the 3'-5' phosphodiester bond.