Ribulose bisphosphate carboxylase, small chain (IPR024681)

Short name: RuBisCO_sc

Overlapping homologous superfamilies


Family relationships



RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase) is a bifunctional enzyme that catalyses both the carboxylation and oxygenation of ribulose-1,5-bisphosphate (RuBP), thus fixing carbon dioxide as the first step of the Calvin cycle. RuBisCO is the major protein in the stroma of chloroplasts, and in higher plants exists as a complex of 8 large and 8 small subunits. The function of the small subunit is unknown [PMID: 3012537]. While the large subunit is coded for by a single gene, the small subunit is coded for by several different genes, which are distributed in a tissue specific manner. They are transcriptionally regulated by light receptor phytochrome [PMID: 3010233], which results in RuBisCO being more abundant during the day when it is required.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.