Nitrosococcus oceani ATCC 19707

Names Nitrosococcus oceani ATCC 19707
Accession numbers NC_007483, NC_007484
Background Nitrosococcus oceani, formerly known as Nitrosocystis oceanus, is a Gram-negative ammonia-oxidizing bacterium isolated from seawater. It is an obligate chemolithoautotroph capable of extracting energy and reducing power from the oxidation of ammonia to nitrite. In contrast to betaproteobacterial nitrifer genomes, it contains two complete rrn operons that belong to different classes. Several blocks of genes that were identified as putatively phage related, indicating that N.oceani has been a frequent target for bacteriophage in the ocean. It contains the genes coding for the biosynthesis of the 20 amino acids. Twenty aminoacyl-tRNA synthetases were identified, including two forms of LysRS and two distinct forms of GlxRS but AsnRS and GlnRS were missing. At least 22 genes involved in iron transport have been identified. Two genes coding for Fur are present. Several uptake systems for other inorganic ions are present. Several sodium/hydrogen antiporters have been found; they play an important role in maintaining intracellular pH and conferring salt tolerance. Nitrosococcus oceani has several protein export and secretion systems, including a preprotein translocase, genes coding gor the TatABC system, as well as genes coding for the type II general secretion/pilus synthesis pathway and genes coding for the type IV conjugal DNA/protein transfer system. It has a cluster of genes encoding parts of a PTS-type sugar transport system. It encodes a form I RuBisCO. N.oceani flagellation and motility genes are arranged in two large clusters. The master switch operon flhCD seems to be missing. N.oceani seems to have only a limited chemotactic activity because only one methyl-accepting chemotaxis protein was identified. A large number of complete two-component systems has been identified. It contains a limited inventory contributing to stress tolerance and oxidative stress tolerance, respectively. (EBI Integr8)
Taxonomy
Kingdom:Bacteria
Phylum:Proteobacteria
Class:Gammaproteobacteria
Order:Chromatiales
Family:Chromatiaceae
Genus:Nitrosococcus
Species:oceani
Strain ATCC 19707
Complete Yes
Sequencing centre (06-OCT-2005) National Center for Biotechnology Information, NIH, Bethesda, MD 20894, USA
(21-SEP-2005) US DOE Joint Genome Institute, 2400 Mitchell Drive B100, Walnut Creek, CA 94598-1698, USA
Sequencing quality Level 6: Finished
Sequencing depth NA
Sequencing method NA
Isolation site seawater, North Atlantic
Isolation country NA
Number of replicons 2
Gram staining properties Negative
Shape Cocci
Mobility Yes
Flagellar presence Yes
Number of membranes 2
Oxygen requirements Aerobic
Optimal temperature NA
Temperature range Mesophilic
Habitat Aquatic
Biotic relationship Free living
Host name NA
Cell arrangement Pairs, Singles
Sporulation NA
Metabolism Ammonia-oxidizer
Nitrifying
Energy source Autotroph, Chemolithotroph
Diseases NA
Pathogenicity No