Nitrous oxide reduction by two partial denitrifying bacteria requires denitrification intermediates that cannot be respired.

ABSTRACT: Denitrification is a form of anaerobic respiration wherein nitrate (NO₃^-) is sequentially reduced via nitrite (NO₂^-), nitric oxide, and nitrous oxide (N₂O) to dinitrogen gas (N₂) by four reductase enzymes. Partial denitrifying bacteria possess only one or some of these four reductases and use them as independent respiratory modules. However, it is unclear if partial denitrifiers sense and respond to denitrification intermediates outside of their reductase repertoire. Here, we tested the denitrifying capabilities of two purple nonsulfur bacteria, Rhodopseudomonas palustris CGA0092 and Rhodobacter capsulatus SB1003. Each had denitrifying capabilities that matched their genome annotation; CGA0092 reduced NO_2<

SUBMITTER: LaSarre B 

PROVIDER: S-EPMC10807417 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature