![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/nuc.png\")
<\/a>The sources of the purine base rings<\/h2>\n<\/span>\n\n\n- one aspartate will give nitrogen,<\/li>
- two nitrogen comes from glutamine<\/li>
- two carbon and one nitrogen is glycine,<\/li>
- two carbons are C1, and one is bicarbonate.<\/li><\/ul>\n\n\n\n
![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/09\/PPP-1024x817.png\")
<\/a>Figure 2. PPP <\/strong><\/figcaption><\/figure><\/div>\n\n\n<\/span>\nSynthesis of the purine nucleotides<\/h2>\n<\/span>\n\n\n- First, 5-phosphoribosyl-1-pyrophosphate is synthesized from ribose-5-phosphate (Mg2+<\/sup> is added, and ATP and ribose-5-phosphate are generated directly by glucose oxidation – Pentose-phosphate pathway<\/a>) (Figure 2-3.)<\/li><\/ol>\n\n\n\n
<\/p>\n\n\n\n
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![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/nuc1-1024x212.png\")
<\/a>Figure 3. Synthesis of the PRPP<\/strong><\/figcaption><\/figure><\/div>\n\n\n\nThe rate-determining and the binding step of the synthesis are when PRPP amidotransferase transfers an amino group of glutamine to PRPP while pyrophosphate breaks down and 5-phosphoribosyl-1-amine is formed (Figure 4).<\/p>\n\n\n\n![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/nuc2-1024x215.png\")
<\/a>Figure 4. Synthesis of 5-phosphoribosyl-1-amine<\/strong><\/figcaption><\/figure>\n\n\n\nThen, glycine is incorporated, a formyl is obtained from tetrahydrofolate, another new glutamine is obtained and an ATP is used (Figure 5-6).<\/p>\n\n\n\n![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/NUC3-1024x275.png\")
<\/a>Figure 5. GAR synthesis<\/strong><\/figcaption><\/figure>\n\n\n\n![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/NUC4-1-1024x751.png\")
<\/a>Figure 6. Synthesis of AIR<\/strong><\/figcaption><\/figure>\n\n\n\nSubsequently, bicarbonate is incorporated, followed by the aspartate, a fumarate exit, introduces another formyl and an IMP is created by a water step (Figure 7).<\/p>\n\n\n\n![\"\"](\"https:\/\/meddists.com\/learn\/wp-content\/uploads\/2021\/12\/NUC5-1-1024x278.png\")
<\/a>Figure 7. IMP synthesis<\/strong><\/figcaption><\/figure>\n\n\n\nAn IMP requires 4 ATPs + 2 PRPPs.<\/strong><\/p>\n\n\n\n
<\/a>Synthesis of the purine nucleotides<\/h2>\n<\/span>\n\n\n- First, 5-phosphoribosyl-1-pyrophosphate is synthesized from ribose-5-phosphate (Mg2+<\/sup> is added, and ATP and ribose-5-phosphate are generated directly by glucose oxidation – Pentose-phosphate pathway<\/a>) (Figure 2-3.)<\/li><\/ol>\n\n\n\n
<\/p>\n\n\n\n
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<\/a>Figure 3. Synthesis of the PRPP<\/strong><\/figcaption><\/figure><\/div>\n\n\n\nThe rate-determining and the binding step of the synthesis are when PRPP amidotransferase transfers an amino group of glutamine to PRPP while pyrophosphate breaks down and 5-phosphoribosyl-1-amine is formed (Figure 4).<\/p>\n\n\n\n<\/a>Figure 4. Synthesis of 5-phosphoribosyl-1-amine<\/strong><\/figcaption><\/figure>\n\n\n\nThen, glycine is incorporated, a formyl is obtained from tetrahydrofolate, another new glutamine is obtained and an ATP is used (Figure 5-6).<\/p>\n\n\n\n<\/a>Figure 5. GAR synthesis<\/strong><\/figcaption><\/figure>\n\n\n\n<\/a>Figure 6. Synthesis of AIR<\/strong><\/figcaption><\/figure>\n\n\n\nSubsequently, bicarbonate is incorporated, followed by the aspartate, a fumarate exit, introduces another formyl and an IMP is created by a water step (Figure 7).<\/p>\n\n\n\n<\/a>Figure 7. IMP synthesis<\/strong><\/figcaption><\/figure>\n\n\n\nAn IMP requires 4 ATPs + 2 PRPPs.<\/strong><\/p>\n\n\n\n
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<\/a>The rate-determining and the binding step of the synthesis are when PRPP amidotransferase transfers an amino group of glutamine to PRPP while pyrophosphate breaks down and 5-phosphoribosyl-1-amine is formed (Figure 4).<\/p>\n\n\n\n Then, glycine is incorporated, a formyl is obtained from tetrahydrofolate, another new glutamine is obtained and an ATP is used (Figure 5-6).<\/p>\n\n\n\n Subsequently, bicarbonate is incorporated, followed by the aspartate, a fumarate exit, introduces another formyl and an IMP is created by a water step (Figure 7).<\/p>\n\n\n\n An IMP requires 4 ATPs + 2 PRPPs.<\/strong><\/p>\n\n\n\n<\/a><\/a><\/a><\/a>