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Chapter 24 : De Novo Purine Nucleotide Synthesis

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De Novo Purine Nucleotide Synthesis, Page 1 of 2

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Abstract:

This chapter reviews current understanding of de novo purine nucleotide synthesis in ,with emphasis on recent developments in understanding gene organization and regulation and on the distinctive structural features of two enzymes of the pathway. Genes for de novo purine nucleotide synthesis are found in four positions on the chromosome. The possible role of gene overlaps is discussed in this chapter. Addition of purine compounds to the growth medium represses the levels of enzymes involved in de novo purine nucleotide synthesis. Adenosine or guanosine repress enzyme levels in the pathway to IMP in mutants unable to interconvert adenine and guanine nucleotides, whereas synthesis of purA-encoded adenylosuccinate synthetase and guaB-encoded IMP dehydrogenase is repressed specifically by adenosine and guanosine, respectively. Limitation of the growth rate resulting from starvation for guanine nucleotides is known to initiate sporulation. Information about the enzymes in the pathway for de novo purine nucleotide synthesis from is limited. Judging from deduced sequence similarities to genes, most enzymes in the pathway are likely similar to those from . There are, however, distinctive features for glutamine PRPP amidotransferase a n d 5'-phosphoribosyl- Af-formylglycinamidine (FGAM) synthetase.

Citation: Zalkin H. 1993. De Novo Purine Nucleotide Synthesis, p 335-341. In Sonenshein A, Hoch J, Losick R (ed), and Other Gram-Positive Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555818388.ch24

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Figure 1

Pathway for de novo purine nucleotide synthesis. 5'-Phosphoribosyl-5-aminoimidazole (AIR) is a branch point for the synthesis of thiamine. Step 5 in the histidine biosynthetic pathway generates 5-phosphoribosyl-4-carboxamide-5-aminoimidazole (AICAR) as a by-product Thick arrows designate multistep pathways. Abbreviations: GAR, 5'-phosphoribosyl-l-glycinamide; FGAR, 5'-phosphoribosylformylglycinamide; 5'-CAIR, 5'-phosphoribosyl-5-aniinoimidazole-4-carboxylate; SAICAR, 5 '-phosphoribosyl-4-(-succinocarboxamide)-5-aminoimidazole; FAICAR, 5'-phosphoribosyl-4-carboxamide-5-fonnamidoimidazole; SAMP, adenylosuccinate.

Citation: Zalkin H. 1993. De Novo Purine Nucleotide Synthesis, p 335-341. In Sonenshein A, Hoch J, Losick R (ed), and Other Gram-Positive Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555818388.ch24
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Image of Figure 2
Figure 2

Schematic representation of a termination-antitermination model for regulation of the operon. The first line shows the region of DNA between the promoter and the first structural gene. Dyad symmetries are indicated by arrows and letters. The second line shows the prematurely terminated mRNA. Hairpin C:D followed by several uridylate residues is the terminator. A hypothetical guanine-activated regulatory protein, shown as a circle, is bound to segment A. The third line shows the antitermination secondary structure that leads to transcription of coding-length mRNA. Taken from reference 54 with permission.

Citation: Zalkin H. 1993. De Novo Purine Nucleotide Synthesis, p 335-341. In Sonenshein A, Hoch J, Losick R (ed), and Other Gram-Positive Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555818388.ch24
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Image of Figure 3
Figure 3

Alignment of and glutamine PRPP amidotransferase segments. The alignment shows sequences at the NH terminus and the four cysteinyl ligands to the 4Fe-4S cluster in the enzyme. Cysis the NH-terminal residue in mature enzymes. Cysteinyl ligands are shaded in grey. Numbers for the COOH termini are at the right.

Citation: Zalkin H. 1993. De Novo Purine Nucleotide Synthesis, p 335-341. In Sonenshein A, Hoch J, Losick R (ed), and Other Gram-Positive Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555818388.ch24
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