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  Home > SCOP hierarchy > RuBisCO, small subunit superfamily


RuBisCO, small subunit superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   Alpha and beta proteins (a+b) [ 53931] (376)
Fold:   RuBisCO, small subunit [ 55238]
Superfamily:   RuBisCO, small subunit [ 55239]
Families:   RuBisCO, small subunit [ 55240]

 Superfamily statistics
Genomes (253) Uniprot 2018_03 genome PDB chains (SCOP 1.75)
Domains 886 5,001 16
Proteins 733 4,346 16

 Functional annotation
General category Metabolism
Detailed category Photosynthesis

Document: Function annotation of SCOP domain superfamilies

Enzyme Commission (EC)

(show details)
EC termFDR (all)SDEO levelAnnotation (direct or inherited)
Enzyme Commission (EC)Lyases0Least InformativeDirect
Enzyme Commission (EC)Carboxy-lyases0Moderately InformativeDirect
Enzyme Commission (EC)Ribulose-bisphosphate carboxylase0Highly InformativeDirect

Document: EC annotation of SCOP domains

Arabidopsis Plant Ontology (AP)

(show details)
AP termFDR (all)SDAP levelAnnotation (direct or inherited)
Plant ANatomical entity (PAN)cardinal part of multi-tissue plant structure0Least InformativeDirect
Plant ANatomical entity (PAN)guard cell0Least InformativeDirect
Plant ANatomical entity (PAN)collective phyllome structure0Least InformativeDirect
Plant ANatomical entity (PAN)leaf0Least InformativeDirect
Plant ANatomical entity (PAN)shoot axis0Least InformativeDirect
Plant ANatomical entity (PAN)flower0Least InformativeDirect
Plant ANatomical entity (PAN)whole plant0.5671Least InformativeInherited
Plant ANatomical entity (PAN)cotyledon0Moderately InformativeDirect
Plant ANatomical entity (PAN)portion of ground tissue0InformativeDirect
Plant ANatomical entity (PAN)fruit0InformativeDirect
Plant ANatomical entity (PAN)portion of vascular tissue0.000001433InformativeDirect
Plant ANatomical entity (PAN)cortex0Highly InformativeDirect
Plant ANatomical entity (PAN)shoot axis stele0.000000000666Highly InformativeDirect
Plant ANatomical entity (PAN)vascular bundle0.000000006976Highly InformativeDirect
Plant ANatomical entity (PAN)mesophyll1Highly InformativeInherited

Document: AP annotation of SCOP domains

Enzyme Commission (EC)

(show details)
EC termFDR (all)SDEC levelAnnotation (direct or inherited)
Enzyme Commission (EC)Lyases0Least InformativeDirect
Enzyme Commission (EC)Carbon-carbon lyases0Moderately InformativeDirect
Enzyme Commission (EC)Carboxy-lyases0InformativeDirect

Document: EC annotation of SCOP domains

InterPro annotation
Cross references IPR000894 SSF55239 Protein matches
Abstract 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 [PubMed3012537]. 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 [PubMed3010233], which results in RuBisCO being more abundant during the day when it is required.

InterPro database

PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Enzyme Commission (EC) · Arabidopsis Plant Ontology (AP) · Enzyme Commission (EC) ]

Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.

Alignments of sequences to 16 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.


Browse and view proteins in genomes which have different domain combinations including a RuBisCO, small subunit domain.

Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.


Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 16 hidden Markov models representing the RuBisCO, small subunit superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.


Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Enzyme Commission (EC) · Arabidopsis Plant Ontology (AP) · Enzyme Commission (EC) · Internal database links ]
Please cite: Gough, J., Karplus, K., Hughey, R. and Chothia, C. (2001). "Assignment of Homology to Genome Sequences using a Library of Hidden Markov Models that Represent all Proteins of Known Structure." J. Mol. Biol., 313(4), 903-919.

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© Copyright 2013 The SUPERFAMILY authors and Julian Gough.