[Some pathways of biosynthesis and degradation of polyphosphates from green algae Acetabularia mediterranea].
The activity of ATP: polyphosphate phosphotransferase was detected in free-cellular extracts of Acetabularia mediterranea. The enzyme activity in cells originally deficient in phosphorus and subsequently transferred into the phosphate-containing medium increases 5-10-fold as compared to normal. Polyphosphate degradation in A. mediterranea is probably produced by polyphosphatase, which was also detected in the free-cellular extract. It was shown that the polyphosphatase activity has two pH optima, i.e. 4.5 and 7.5, and is considerably increased when the cells are transferred into the phosphate-free medium. It is assumed that high-molecular polyphosphates involved in A. Mediterranea metabolism are responsible for regulation of orthophosphate and ATP level in the cells by ATP: polyphosphate phosphotransferase and polyphosphatase.
D000076:Acetabularia / Q000378:metabolism*; D017766:Acid Anhydride Hydrolases; D002474:Cell-Free System; D000460:Chlorophyta / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D010710:Phosphates / Q000096:biosynthesis / Q000378:metabolism*; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism*; D010770:Phosphotransferases / Q000378:metabolism*
D010710:Phosphates; D010770:Phosphotransferases; D010744:Phosphoric Monoester Hydrolases; D017766:Acid Anhydride Hydrolases; C022563:endopolyphosphatase
Nekotorye puti biosinteza i raspada polifosfatov u zelenoĭ vodorosli Acetabularia mediterranea.