Question
How purine nucleotides are synthesized de novo?
Answer :
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Purine nucleotides are synthesized de novo through a complex biochemical pathway that starts with simple precursors, ultimately forming the purine ring structure. The process occurs primarily in the liver and involves the sequential addition of atoms to a ribose sugar, resulting in inosine monophosphate (IMP), which serves as a precursor for both adenine and guanine nucleotides. The de novo synthesis of purine nucleotides begins with the activation of ribose-5-phosphate, a product of the pentose phosphate pathway. This compound is converted into 5-phosphoribosyl-1-pyrophosphate (PRPP) by the enzyme ribose-phosphate pyrophosphokinase. PRPP is a key intermediate in purine biosynthesis, acting as a donor of the ribose-5-phosphate group. The next critical step is the formation of 5-phosphoribosylamine, which is catalyzed by the enzyme amidophosphoribosyl transferase. This enzyme adds an amine group (derived from glutamine) to
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