Glycerophosphodiester phosphodiesterase domain of mammalian glycerophosphodiester phosphodiesterase GDE6 and similar proteins
This subfamily corresponds to the glycerophosphodiester phosphodiesterase domain (GDPD) present in mammalian GDE6 (also known as glycerophosphodiester phosphodiesterase domain-containing protein 4 (GDPD4)) and their metazoan homologs. Mammalian GDE6 is a transmembrane protein predominantly expressed in the spermatocytes of testis. Although the specific physiological function of mammalian GDE6 has not been elucidated, its different pattern of tissue distribution suggests it might play a critical role in the completion of meiosis during male germ cell differentiation.
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.