SAICAR (a ribotide) can lose its phosphate group leading to the appearance of a riboside known as succinylaminoimidazolecarboxamide riboside (SAICAriboside or SAICAr) in cerebrospinal fluid, in urine, and, to a lesser extent, in plasma. SAICAriboside is characteristic of ADSL, a heritable deficiency of the enzyme adenylosuccinate lyase (ASL or adenylosuccinase) responsible for metabolizing SAICAR (SZMP) to AICAR (ZMP) and adenylosuccinate (SAMP) to AMP. ASL deficiency causes increased SAICAR & SAMP, and their corresponding rephosphorylated products SAICAr & succinyladenosine (S-Ado).
Purine homeostasis is ensured through a metabolic network widely conserved from prokaryotes to humans. Purines can either be synthesized de novo, reused, or produced by interconversion of extant metabolites using the so-called recycling pathway. Although thoroughly characterized in microorganisms, such
A mild form of adenylosuccinate lyase deficiency in absence of typical brain MRI features diagnosed by whole exome sequencing
The Journal of biological chemistry, 294(3), 805-815 (2018-11-28)
5-Aminoimidazole-4-carboxamide 1-β-d-ribofuranoside (AICAR, or acadesine) is a precursor of the monophosphate derivative 5-amino-4-imidazole carboxamide ribonucleoside 5'-phosphate (ZMP), an intermediate in de novo purine biosynthesis. AICAR proved to have promising anti-proliferative properties, although the molecular basis of its toxicity is poorly
Mass spectrometric analysis of purine de novo biosynthesis intermediates
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