A dramatic conformational rearrangement is necessary for the activation of DNR from Pseudomonas aeruginosa. Crystal structure of wild-type DNR.
Proteins
; 77(1): 174-80, 2009 Oct.
Article
en En
| MEDLINE
| ID: mdl-19415759
ABSTRACT
The opportunistic pathogen Pseudomonas aeruginosa can grow in low oxygen, because it is capable of anaerobic respiration using nitrate as a terminal electron acceptor (denitrification). An intermediate of the denitrification pathway is nitric oxide, a compound that may become cytotoxic at high concentration. The intracellular levels of nitric oxide are tightly controlled by regulating the expression of the enzymes responsible for its synthesis and degradation (nitrite and nitric oxide reductases). In this article, we present the crystallographic structure of the wild-type dissimilative nitrate respiration regulator (DNR), a master regulator controlling expression of the denitrification machinery and a putative target for new therapeutic strategies. Comparison with other structures among the CRP-FNR class of regulators reveals that DNR has crystallized in a conformation that has never been observed before. In particular, the sensing domain of DNR has undergone a rotation of more than 50 degrees with respect to the other structures. This suggests that DNR may undergo an unexpected and very large conformational rearrangement on activation.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Pseudomonas aeruginosa
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Proteínas Bacterianas
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Factores de Transcripción
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Cristalografía por Rayos X
Idioma:
En
Revista:
Proteins
Asunto de la revista:
BIOQUIMICA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Italia