purine
Noun
Meaning
a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances
any of several bases that are derivatives of purine
Source: WordNetSynonyms
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As a bicyclic, heterocyclic purine derivative, uric acid does not protonate as an oxygen (−OH) like carboxylic acids do.
It is aromatic because of the purine functional group.
Pyrimidine and purine degradation In humans, pyrimidine rings (C, T, U) can be degraded completely to CO 2 and NH 3 (urea excretion).
To be viable, organisms possess a number of (deoxy)purine phosphohydrolases, which hydrolyze these purine derivatives removing them from the active NTP and dNTP pools.
When purines are formed, they inhibit the enzymes required for more purine formation.
This is the committed step in purine synthesis.