Glycerophosphodiester phosphodiesterase domain of Thermoanaerobacter tengcongensis and similar proteins
This subfamily corresponds to the glycerophosphodiester phosphodiesterase domain (GDPD) present in Thermoanaerobacter tengcongensis glycerophosphodiester phosphodiesterase (TtGDE, EC 3.1.4.46) and its uncharacterized homologs. Members in this family show high sequence similarity to Escherichia coli GP-GDE, which catalyzes the degradation of glycerophosphodiesters to produce sn-glycerol-3-phosphate (G3P) and the corresponding alcohols. Despite the fact that most of GDPD family members exist as the monomer, TtGDE can function as a dimeric unit. Its catalytic mechanism is based on the general base-acid catalysis, which is similar to that of phosphoinositide-specific phospholipases C (PI-PLCs, EC 3.1.4.11). A divalent metal cation is required for the enzyme activity of TtGDE.
Comment:The catalytic mechanism of glycerophosphodiester phosphodiesterases is based on the metal ion-dependent general acid-base reaction.
Structure:2PZ0; The catalytic site of Thermoanaerobacter tengcongensis glycerophosphodiester phosphodiesterase consists of two conserved histidine residues, which serve as general acid and general base in catalyzing the hydrolysis of the 3'-5' phosphodiester bond.
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