Paracoccus Denitrificans

AKA: P. Denitrificans.
Context:
- P. Denitrificans reduce nitrate to dinitrogen under anaerobic growth conditions.
Example(s):
- Paracoccus Denitrificans http://www.uniprot.org/uniprot/Q51700
- PMID 4960932: “The nos (nitrous oxide reductase ) operon of Paracoccus denitrificans contains a nosX gene homologous to those found in the nos operons of other denitrifiers .NosX is also homologous to NirX, which is so far unique to P. denitrificans .Single mutations of these genes did not result in any apparent phenotype, but a double nosX nirX mutant was unable to reduce nitrous oxide .Promoter-lacZ assays and immunoblotting against nitrous oxide reductase showed that the defect was not due to failure of expression of nosZ, the structural gene for nitrous oxide reductase .Electron paramagnetic resonance spectroscopy showed that nitrous oxide reductase in cells of the double mutant lacked the CuA center .A twin-arginine motif in both NosX and NirX suggests that the NosX proteins are exported to the periplasm via the TAT translocon .”
See: strain Pd 1222, P. Denitrificans.

References

(Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Paracoccus_denitrificans
- Paracoccus denitrificans, a Gram-negative, coccoid, denitrifying (nitrate-reducing) bacterium, formerly known as Micrococcus denitrificans, was first isolated in 1910 by Martinus Beijerinck [1]. It was renamed in 1969 to Paracoccus denitrificans by Davis [2]. Paracoccus denitrificans harbors many features also found in mitochondria and because of this, Paracoccus denitrificans is thought to be a plausible ancestor of the eukaryotic mitochondrion (endosymbiotic theory) [3]. The genome of P. denitrificans was sequenced in 2004 [4].