microorganisms to heavy metals ( four , 34 ). Acidocalcisomes have been demonstrated to own excessive concentrations of brief- and long-chain polyP, phosphate, and pyrophosphate (PPi) ( 15 , 80 , 81 ). PPi will be found in cells of each eukaryotic and prokaryotic microorganisms as a by-product of cellular activity ( 15 ). In bacteria, it intervenes in numerous enzymatic reactions ( 12 , 54 , 75 ). R. rubrum stores PPi within acidocalcisomes ( 80 ) and can synthesizes PPi during photosynthesis to create a H+ gradient throughout the membranes of chromatophores.
2 ). The acidocalcisome is an acidic calcium and polyP storage organelle that was first noticed in