Enzymatic activities for interconversion of purines in spirochetes

Area of Science:

• Microbiology
• Biochemistry

Background:

• Spirochetes are bacteria known for unique metabolic capabilities.
• Understanding their purine metabolism is crucial for comprehending their survival strategies.

Purpose of the Study:

• To investigate the presence and function of purine interconversion enzymes in four spirochete species.
• To elucidate the biochemical pathways involved in purine metabolism within these organisms.

Main Methods:

• Analysis of cell extracts from Spirochaeta aurantia, Spirochaeta stenostrepta, Treponema succinifaciens, and Treponema denticola.
• Assays for phosphoribosyltransferase, nucleotidase, nucleoside phosphorylase, nucleoside hydrolase, guanine deaminase, adenosine deaminase, and adenine deaminase activities.

Main Results:

• All four spirochete species exhibited phosphoribosyltransferase activities converting purine bases to nucleotides (AMP, IMP, GMP).
• Nucleotidase activities facilitated nucleoside formation from nucleotides.
• Nucleoside phosphorylase and hydrolase activities mediated the conversion of nucleosides to purine bases.
• Specific deaminase activities (guanine, adenosine, adenine) were identified with varying distribution and characteristics.

Conclusions:

• The studied spirochete species possess a wide array of enzymes for purine interconversion.
• These enzymatic capabilities suggest a role in purine salvage pathways, supporting spirochete survival in nutrient-poor environments.