ID   A4SA21_OSTLU            Unreviewed;       134 AA.
AC   A4SA21;
DT   15-MAY-2007, integrated into UniProtKB/TrEMBL.
DT   15-MAY-2007, sequence version 1.
DT   27-MAR-2024, entry version 83.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit {ECO:0000256|RuleBase:RU003627};
DE            Short=RuBisCO small subunit {ECO:0000256|RuleBase:RU003627};
DE   Flags: Fragment;
GN   ORFNames=OSTLU_42060 {ECO:0000313|EMBL:ABP00588.1};
OS   Ostreococcus lucimarinus (strain CCE9901).
OC   Eukaryota; Viridiplantae; Chlorophyta; Mamiellophyceae; Mamiellales;
OC   Bathycoccaceae; Ostreococcus.
OX   NCBI_TaxID=436017 {ECO:0000313|EMBL:ABP00588.1, ECO:0000313|Proteomes:UP000001568};
RN   [1] {ECO:0000313|EMBL:ABP00588.1, ECO:0000313|Proteomes:UP000001568}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CCE9901 {ECO:0000313|EMBL:ABP00588.1,
RC   ECO:0000313|Proteomes:UP000001568};
RX   PubMed=17460045; DOI=10.1073/pnas.0611046104;
RA   Palenik B., Grimwood J., Aerts A., Rouze P., Salamov A., Putnam N.,
RA   Dupont C., Jorgensen R., Derelle E., Rombauts S., Zhou K., Otillar R.,
RA   Merchant S.S., Podell S., Gaasterland T., Napoli C., Gendler K.,
RA   Manuell A., Tai V., Vallon O., Piganeau G., Jancek S., Heijde M.,
RA   Jabbari K., Bowler C., Lohr M., Robbens S., Werner G., Dubchak I.,
RA   Pazour G.J., Ren Q., Paulsen I., Delwiche C., Schmutz J., Rokhsar D.,
RA   Van de Peer Y., Moreau H., Grigoriev I.V.;
RT   "The tiny eukaryote Ostreococcus provides genomic insights into the paradox
RT   of plankton speciation.";
RL   Proc. Natl. Acad. Sci. U.S.A. 104:7705-7710(2007).
CC   -!- FUNCTION: RuBisCO catalyzes two reactions: the carboxylation of D-
CC       ribulose 1,5-bisphosphate, the primary event in carbon dioxide
CC       fixation, as well as the oxidative fragmentation of the pentose
CC       substrate. Both reactions occur simultaneously and in competition at
CC       the same active site. Although the small subunit is not catalytic it is
CC       essential for maximal activity. {ECO:0000256|RuleBase:RU003627}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000256|RuleBase:RU003627}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000256|RuleBase:RU003627}.
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DR   EMBL; CP000597; ABP00588.1; -; Genomic_DNA.
DR   RefSeq; XP_001422271.1; XM_001422234.1.
DR   AlphaFoldDB; A4SA21; -.
DR   STRING; 436017.A4SA21; -.
DR   EnsemblPlants; ABP00588; ABP00588; OSTLU_42060.
DR   GeneID; 5006223; -.
DR   Gramene; ABP00588; ABP00588; OSTLU_42060.
DR   KEGG; olu:OSTLU_42060; -.
DR   eggNOG; ENOG502QT0M; Eukaryota.
DR   HOGENOM; CLU_098114_2_0_1; -.
DR   OMA; KQCQVLS; -.
DR   OrthoDB; 5482775at2759; -.
DR   Proteomes; UP000001568; Chromosome 17.
DR   GO; GO:0009536; C:plastid; IEA:UniProtKB-KW.
DR   GO; GO:0009853; P:photorespiration; IEA:UniProtKB-UniRule.
DR   GO; GO:0019253; P:reductive pentose-phosphate cycle; IEA:UniProtKB-KW.
DR   CDD; cd03527; RuBisCO_small; 1.
DR   Gene3D; 3.30.190.10; Ribulose bisphosphate carboxylase, small subunit; 1.
DR   HAMAP; MF_00859; RuBisCO_S_bact; 1.
DR   InterPro; IPR024681; RuBisCO_ssu.
DR   InterPro; IPR000894; RuBisCO_ssu_dom.
DR   InterPro; IPR036385; RuBisCO_ssu_sf.
DR   PANTHER; PTHR31262; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 1, CHLOROPLASTIC; 1.
DR   Pfam; PF00101; RuBisCO_small; 1.
DR   PRINTS; PR00152; RUBISCOSMALL.
DR   SMART; SM00961; RuBisCO_small; 1.
DR   SUPFAM; SSF55239; RuBisCO, small subunit; 1.
PE   3: Inferred from homology;
KW   Calvin cycle {ECO:0000256|ARBA:ARBA00022567};
KW   Carbon dioxide fixation {ECO:0000256|ARBA:ARBA00023300,
KW   ECO:0000256|RuleBase:RU003627};
KW   Photorespiration {ECO:0000256|ARBA:ARBA00023238,
KW   ECO:0000256|RuleBase:RU003627};
KW   Photosynthesis {ECO:0000256|ARBA:ARBA00022531,
KW   ECO:0000256|RuleBase:RU003627}; Plastid {ECO:0000256|RuleBase:RU003627};
KW   Reference proteome {ECO:0000313|Proteomes:UP000001568}.
FT   DOMAIN          3..119
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
FT   NON_TER         1
FT                   /evidence="ECO:0000313|EMBL:ABP00588.1"
SQ   SEQUENCE   134 AA;  15317 MW;  AD9548CA194A715A CRC64;
     RRMFETFSFL PPLSDAEISK QVQYLLNNGW TPCIEFEDSA HAYTDGHGWA NMDTSINAGY
     YDNRYWVMWK LPMYGCQNPD EVIAEINTCI KCFPECYVRV AGFDNIKQVQ CSAFLAHRPA
     SEAACAVDQR QVQG
//