In vitro 5-phosphoribosyl 1-pyrophosphate-independent salvage biosynthesis of ribo- and deoxyriboadenine nucleotides in Bacillus cereus

• Published in: Biochimica et biophysica acta Vol. 842; no. 1; pp. 84 - 89
• Main Authors: Ipata, Pier Luigi, Gini, Stefania, Tozzi, Maria Grazia
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1985; Elsevier; North-Holland
• Subjects: Adenine nucleotide synthesis; Adenosine Triphosphate - biosynthesis; B. cereus; Bacillus cereus - metabolism; Bacteriology; Biological and medical sciences; Deoxyadenine Nucleotides - biosynthesis; Fundamental and applied biological sciences. Psychology; Metabolism. Enzymes; Microbiology; Purine salvage pathway; Ribosemonophosphates - metabolism; P Rib- PP; B. cereus; Purine salvage pathway; Adenine nucleotide synthesis; Thin layer chromatography; Bacillus cereus; Bacillales; Adenine; Microorganism culture; Nucleotide; Bacteria; Biosynthesis; Bacillaceae; Metabolism; ATP; In vitro
• ISSN: 0304-4165; 0006-3002; 1872-8006
• DOI: 10.1016/0304-4165(85)90297-1

The pools of free ribose 1-phosphate and deoxyribose 1-phosphate have been measured in Bacillus cereus. It is shown that crude extracts of the same organism can actively utilize the sugar phosphates to convert adenine to ATP and deoxyATP, via a ‘salvage’ pathway, involving adenine ribosylation (or deoxyribosylation), followed by multiple phosphorylation steps. The biosynthetic pathway operates even in the presence of excess P i, thus showing that purine nucleoside phosphorylases may function in vivo, contrary to what is generally assumed, as anabolic rather than catabolic enzymes.