Ureaplasma is a genus of wall-less bacteria in the class Mollicutes, comprising two species pathogenic to humans: U. urealyticum and U. parvum. The genus is named for its defining characteristic — obligate urease activity — which hydrolyzes urea to ammonia and CO2, providing the organism's primary energy source. This urease is nickel-dependent, making Ureaplasma directly relevant to the metal-microbiome axis in WikiBiome.
Metal Dependencies — Nickel Urease
Ureaplasma's urease is a Ni-Fe metalloenzyme that is absolutely required for growth — without urease activity, Ureaplasma cannot generate ATP. This creates a clear Achilles' heel (Karen's Brain Primitive 4):
- Nickel restriction could theoretically inhibit Ureaplasma colonization by starving the urease of its essential cofactor maier 2019 nickel microbial pathogenesis.
- Ureaplasma shares nickel dependency with other urease-producing pathogens in this wiki (helicobacter pylori, proteus mirabilis), suggesting convergent vulnerability to nickel-targeting interventions.
- In preterm infants, nickel availability in the gut may influence Ureaplasma colonization and NEC risk pendergrass 2026 nickel nec preterm gut.
The ammonia generated by urease activity raises local pH, which may contribute to:
- Urinary stone formation (struvite stones in UTI)
- Vaginal pH disruption (favoring BV-associated organisms)
- Mucosal tissue damage in the reproductive tract
Reproductive Tract Ecology
Male Reproductive Tract
- Ureaplasma is one of the most common organisms in the male urogenital tract, colonizing the urethra, prostate, and seminal fluid molina morales 2023 male reproductive tract microbiome magill 2023 male infertility human microbiome.
- Implicated in chronic prostatitis (Category III/IV), where it may persist intracellularly magri 2018 multidisciplinary prostatitis.
- Associated with male infertility through sperm membrane damage (ammonia toxicity), increased ROS production, and impaired motility neto 2024 environmental factors seminal microbiome sperm quality.
Female Reproductive Tract
- Present in vaginal and cervical microbiomes, with abundance shifts in endometriosis patients shen 2022 vaginal microecological characteristics endometriosis ata 2019 endobiota study vaginal cervical gut microbiota endometriosis hernandes 2020 microbiome profile deep endometriosis macsharry 2024 endometriosis vaginal microbiota n glycome.
- Part of the altered reproductive tract microbiome in endometriosis miyashira 2022 microbiome and endometriosis.
Neonatal
- Ureaplasma colonization in preterm infants is associated with bronchopulmonary dysplasia and may contribute to NEC risk, potentially through ammonia-mediated mucosal injury pendergrass 2026 nickel nec preterm gut.
Cross-References
- nickel — nickel-dependent urease as essential virulence factor
- nickel urease — the enzyme class shared with H. pylori
- helicobacter pylori — shares nickel-urease dependency
- proteus mirabilis — another nickel-urease-dependent urogenital pathogen
- endometriosis — vaginal/cervical microbiome associations
- necrotizing enterocolitis — preterm colonization risk
- nutritional immunity — nickel restriction as theoretical intervention target