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RPI_A: Ribose 5-phosphate isomerase type A (RPI_A) subfamily; RPI catalyzes the reversible conversion of ribose-5-phosphate to ribulose 5-phosphate, the first step of the non-oxidative branch of the pentose phosphate pathway. This reaction leads to the conversion of phosphosugars into glycolysis intermediates, which are precursors for the synthesis of amino acids, vitamins, nucleotides, and cell wall components. In plants, RPI is part of the Calvin cycle as ribulose 5-phosphate is the carbon dioxide receptor in the first dark reaction of photosynthesis. There are two unrelated types of RPIs (A and B), which catalyze the same reaction, at least one type of RPI is present in an organism. RPI_A is more widely distributed than RPI_B in bacteria, eukaryotes, and archaea.
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