RuBisCO_small

Ribulose bisphosphate carboxylase, small chain
RuBisCO_small
SMART accession number:SM00961
Description: 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 (PUBMED: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 (PUBMED:3010233), which results in RuBisCO being more abundant during the day when it is required.
Interpro abstract (IPR000894): 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 [(PUBMED: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 [(PUBMED:3010233)], which results in RuBisCO being more abundant during the day when it is required.

The RuBisCo small subunit consists of a central four-stranded beta-sheet, with two helices packed against it [(PUBMED:1512238)].

Family alignment:
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There are 1023 RuBisCO_small domains in 723 proteins in SMART's nrdb database.

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