Synechocystis

Taxobox
color = lightgrey
name = "Synechocystis sp PCC6803"


regnum = Bacteria
phylum = Cyanobacteria
ordo = Chroococcales
genus = "Synechocystis"
species = "S. sp PCC6803"
binomial = "Synechocystis sp"

"Synechocystis" sp PCC6803 is a marine cyanobacterium, capable of both, photolithotrophic growth by oxygenic photosynthesis in sun light and heterotrophic growth by glycolysis and oxidative phosphorylation during dark periods. Transitions of light and dark phases are effectively anticipated by a circadian clock.

Overview

Cyanobacteria are model microorganisms for the study of photosynthesis, carbon and nitrogen assimilation, evolution of plant plastids, and adaptability to environmental stresses.Synechocystis sp PCC 6803 is one of the most highly studied cyanobacterium as it can grow both autotrophically or heterotrophically in the absence of light. It was isolated from a freshwater lake in 1968 and is easily transformed by exogenous DNA. The photosynthetic apparatus is very similar to the one found in plants. This organism also exhibits phototactic movement.

Light-activated heterotrophy

It can live completely heterotrophically in the dark, but for yet unknown reasons requires a minimum of 5 to 15 minutes (blue) light per day. This regulatory role of light is intact in both PSI and PSII deficient strains [cite journal |author=Anderson SL and McIntosh L |year=1991 |month=May |title=Light-activated heterotrophic growth of the cyanobacterium Synechocystis sp. strain PCC 6803: a blue-light-requiring process |journal=J Bacteriol |volume=173 |issue=9 |pages=2761-2767 |pmid=1902208 ] .

NDH-2 is a regulatory quinone:NAD(P)H oxidoreductase [cite journal |author= Howitt CA, Udall PK, and Vermaas WF|year=1999 |month=Jul |title=Type 2 NADH dehydrogenases in the cyanobacterium Synechocystis sp. strain PCC 6803 are involved in regulation rather than respiration |journal=J Bacteriol |volume=181 |issue=13 |pages=3994-4003 |pmid=10383967 ] global analysis of circadian gene expression indicates that translation genes are expressed at the early subjective day [cite journal |author=Kucho K, Okamoto K, Tsuchiya Y, Nomura S, Nango M, Kanehisa M, and Ishiura M |year=2005 |month=Mar |title=Global analysis of circadian expression in the cyanobacterium Synechocystis sp. strain PCC 6803 |journal=J Bacteriol |volume=187 |issue=6 |pages=2190-2199 |pmid=15743968 ] .

References

Databases

* [http://bioportal.kobic.re.kr/SynechoNET/ SynechoNET] : integrated protein-protein interaction database of a model cyanobacterium Synechocystis sp. PCC 6803. SynechoNET is a specialized cyanobacterial protein-protein interaction database. It shows feasible cyanobacterial domain-domain interactions, as well as their protein level interactions using the model cyanobacterium, Synechocystis sp. PCC 6803. Additionally, SynechoNET provides transmembrane topology and domain information, as well as the interaction networks in graphical web interfaces.

* [http://bacteria.kazusa.or.jp/cyano/Synechocystis/index.html CyanoBase] : Cyanobacteria carry a complete set of genes for oxygenic photosynthesis, which is the most fundamental life process on the earth. This organism is also interesting from an evolutional viewpoint, for it was born in a very ancient age and has survived in various environments. Chloroplast is believed to have evolved from cyanobacterial ancestors which developed an endosymbiontic relationship with a eukaryotic host cell. CyanoBase provides an easy way of accessing the sequences and all-inclusive annotation data on the structures of the cyanobacterial genomes. This database was originally developed by Makoto Hirosawa, Takakazu Kaneko and Satoshi Tabata, and the current version of CyanoBase has been developed and maintained by Yasukazu Nakamura, Takakazu Kaneko, and Satoshi Tabata at Kazusa DNA Research Institute.

* [http://string.embl.de/ STRING] : STRING is a database of known and predicted protein-protein interactions.The interactions include direct (physical) and indirect (functional) associations; they are derived from four sources: Genomic Context, High-throughpot Experiments, (Conserved) Coexpression, and Previous Knowledge. The database currently contains 1,513,782 proteins in 373 species. Especially, the database provides interactions for Synechocystis sp. PCC 6803.

* [http://cegwz.com/ cTFbase] : cTFbase contains 1288 putative TFs identified from 21 fully sequenced cyanobacterial genomes. Through its user-friendly interactive interface, users can employ various criteria to retrieve all TF sequences and their detailed annotation information, including sequence features, domain architecture and sequence similarity against the linked databases. Furthermore, cTFbase also provides phylogenetic trees of individual TF family, multiple sequence alignments of the DNA-binding domain and ortholog identification from any selected genomes.