Modes of active inorganic carbon uptake in the cyanobacterium, Synechococcus sp. PCC7942

Functional Plant Biology : FPB
G Dean PriceMurray R Badger

Abstract

Cyanobacteria (blue-green algae) have evolved a remarkable environmental adaptation for survival at limiting CO2 concentrations. The adaptation is known as a CO2 concentrating mechanism, and functions to actively transport and accumulate inorganic carbon (Ci; HCO3- and CO2) within the cell. Thereafter, this Ci pool is utilised to provide elevated CO2 concentrations around the primary CO2 fixing enzyme, Rubisco, which is encapsulated in a unique micro-compartment known as the carboxysome. Recently, significant progress has been gained in understanding the different types of Ci transport in cyanobacteria. This semi-review centres on the model cyanobacterium, Synechococcus sp. PCC7942, which possesses at least four distinct modes of Ci uptake when grown under Ci limitation, each possessing a high degree of functional redundancy. The four modes so far identified are: (i) BCT1, an inducible, high affinity HCO3- transporter of the bacterial ATP binding cassette transporter family, encoded by cmpABCD; (ii) a constitutive, Na+-dependent HCO3- transport system that can be allosterically activated (possibly by phosphorylation) in as little as 10 min; (iii) and (iv) two CO2 uptake systems, one constitutive and the other inducible, based o...Continue Reading

Citations

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