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A previous study showed that ammonia oxidation by theThaumarchaeota Nitrosopumilus maritimus (group 1.1a) was resistant to concentrations of the C8 1-alkyne, octyne, which completely inhibits activity by ammonia-oxidizing bacteria. In this study, the inhibitory effects of octyne and other C2 to C10 1-alkynes were evaluated on the nitrite production activity of two pure culture isolates fromThaumarchaeota group 1.1b,Nitrososphaera viennensis strain EN76 andNitrososphaera gargensis . BothN. viennensis andN. gargensis were insensitive to concentrations of octyne that cause complete and irreversible inactivation of nitrite production by ammonia-oxidizing bacteria. However, octyne concentrations (≥20 μM) that did not inhibitN. maritimus partially inhibited nitrite production inN. viennensis andN. gargensis in a manner that did not show the characteristics of irreversible inactivation. In contrast to previous studies with an ammonia-oxidizing bacterium,Nitrosomonas europaea , octyne inhibition ofN. viennensis was: (i) fully and immediately reversible, (ii) not competitive with NH4 + , and (iii) without effect on the competitive interaction between NH4 + and acetylene. BothN. viennensis andN. gargensis demonstrated the same overall trend in regard to 1-alkyne inhibition as previously observed forN. maritimus , being highly sensitive to ≤C5 alkynes and more resistant to longer-chain length alkynes. Reproducible differences were observed amongN. maritimus ,N. viennensis , andN. gargensis in regard to the extent of their resistance/sensitivity to C6 and C7 1-alkynes, which may indicate differences in the ammonia monooxygenase binding and catalytic site(s) among theThaumarchaeota .

Inhibitory Effects of C 2 to C 10 1-Alkynes on Ammonia Oxidation in Two Nitrososphaera Species

Inhibitory Effects of C ₂ to C ₁₀ 1-Alkynes on Ammonia Oxidation in Two Nitrososphaera Species