UniProt functional annotation for P23755

UniProt code: P23755.

Organism: Galdieria sulphuraria (Red alga).
Taxonomy: Eukaryota; Rhodophyta; Bangiophyceae; Cyanidiales; Cyanidiaceae; Galdieria.
 
Function: RuBisCO catalyzes two reactions: the carboxylation of D- ribulose 1,5-bisphosphate, the primary event in carbon dioxide fixation, as well as the oxidative fragmentation of the pentose substrate in the photorespiration process. Both reactions occur simultaneously and in competition at the same active site (By similarity).
 
Catalytic activity: 2 3-phospho-D-glycerate + 2 H(+) = D-ribulose 1,5-bisphosphate + CO(2) + H(2)O.
Catalytic activity: 3-phospho-D-glycerate + 2-phosphoglycolate = D-ribulose 1,5-bisphosphate + O(2).
Cofactor: Binds 1 magnesium ion per subunit (By similarity).
Subunit: Heterohexadecamer of 8 large chains and 8 small chains (By similarity).
Subcellular location: Plastid, chloroplast.
Miscellaneous: The basic functional RuBisCO is composed of a large chain homodimer in a "head-to-tail" conformation. In form I RuBisCO this homodimer is arranged in a barrel-like tetramer with the small subunits forming a tetrameric "cap" on each end of the "barrel" (By similarity).
Similarity: Belongs to the RuBisCO large chain family. Type I subfamily.

Annotations taken from UniProtKB at the EBI.