Accumulation of NO2 -cobalamin in nutrient-stressed ammonia-oxidizing archaea and in the oxygen deficient zone of the eastern tropical North Pacific.
Environ Microbiol Rep
; 10(4): 453-457, 2018 08.
Article
en En
| MEDLINE
| ID: mdl-30022612
ABSTRACT
Cobalamin (vitamin B12 ) is a precious resource in natural systems that is produced by select prokaryotes and required by a broad range of organisms. In this way, the production of cobalamin reinforces numerous microbial interdependencies. Here we report the accumulation of an unusual form of cobalamin, nitrocobalamin (NO2 -cobalamin), in a marine oxygen deficient zone (ODZ), isolates of ammonia-oxidizing archaea (AOA), and an anaerobic ammonium-oxidizing (anammox) bacteria enriched bioreactor. Low oxygen waters were enriched in NO2 -cobalamin, and AOA isolates experiencing ammonia or copper stress produced more NO2 -cobalamin, though there is wide strain-to-strain and batch-to-batch variability. NO2 -cobalamin has no known biochemical role. We hypothesize that AOA and anammox bacteria are a source of marine NO2 -cobalamin in the environment via a reactive nitrogen intermediate. These findings suggest connections between cobalamin forms and nitrogen transformations, physiological stress and ocean deoxygenation.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Agua de Mar
/
Estrés Fisiológico
/
Vitamina B 12
/
Archaea
Idioma:
En
Revista:
Environ Microbiol Rep
Año:
2018
Tipo del documento:
Article
País de afiliación:
Estados Unidos