Enzymic release of carbon atom 8 from guanosine triphosphate, an early reaction in the conversion of purines to pteridines.
D000255:Adenosine Triphosphate / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism*; D006150:Guanine Nucleotides / Q000378:metabolism*; D008274:Magnesium / Q000378:metabolism; D011549:Pseudomonas / Q000378:metabolism*; D011621:Pteridines / Q000096:biosynthesis*; D011687:Purines / Q000378:metabolism*
D006150:Guanine Nucleotides; D011621:Pteridines; D011687:Purines; D002245:Carbon Dioxide; D000255:Adenosine Triphosphate; D008274:Magnesium