An all-purine precursor of nucleic acids.
The theory is proposed that the pyrimidines in extant nucleic acids are postenzymatic substitutes for their isoelectronic and isogeometric position 3-bonded purine analogs xanthine and isoguanine, which were sibling products in a preenzymatic de novo purine pathway.
Wächtershäuser
G
G
D001482:Base Composition; D009696:Nucleic Acids / Q000096:biosynthesis*; D011687:Purines / Q000378:metabolism*
D009696:Nucleic Acids; D011687:Purines