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De novo synthesis: Wikis


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From Wikipedia, the free encyclopedia

De novo is a Latin phrase, meaning "from the new," anew, from scratch, or from the beginning. De novo synthesis refers to the synthesis of complex molecules from simple molecules such as sugars or amino acids, as opposed to their being recycled after partial degradation. For example, nucleotides are not needed in the diet as they can be constructed from small precursor molecules such as formate and aspartate.

De novo synthesis also refers to DNA replication. Primase is an RNA Polymerase, and it can add a primer to an existing strand awaiting replication. DNA Polyermase cannot add primers, and therefore, needs Primase to add the primer de novo.

De novo Pathways

Do not use free bases: guanine, adenine, thymine, cytosine or uracil. The purine ring is built up one or a few at a time and attached to ribose throughout the process. De novo synthesis enzymes are present as large multienzyme complexes in purines. Pyrimidine ring is synthesized as orotate and attached to ribose phosphate and later converted to common pyrimidine nucleotides.

Denovo origins come from Apartate, Glycine, Fomate, Glutamine amide and carbon dioxide.

De novo Synthesis

1. Glutamine PRPP Amindotranferase reaction 2. Amindophosphoribosyl Tranferase reaction 3. GAR Transformylase reaction 4. FGAM Synthetase (FGAR Amidotransferase) reaction 5. FGAM Synthetase (Cyclase) reaction


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