ID   K9YGX8_HALP7            Unreviewed;       111 AA.
AC   K9YGX8;
DT   06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT   06-MAR-2013, sequence version 1.
DT   27-MAR-2024, entry version 36.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit {ECO:0000256|HAMAP-Rule:MF_00859};
DE            Short=RuBisCO small subunit {ECO:0000256|HAMAP-Rule:MF_00859};
GN   Name=cbbS {ECO:0000256|HAMAP-Rule:MF_00859};
GN   Synonyms=rbcS {ECO:0000256|HAMAP-Rule:MF_00859};
GN   OrderedLocusNames=PCC7418_3539 {ECO:0000313|EMBL:AFZ45650.1};
OS   Halothece sp. (strain PCC 7418) (Synechococcus sp. (strain PCC 7418)).
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Oscillatoriophycideae;
OC   Chroococcales; Halothecacae; Halothece cluster; Halothece.
OX   NCBI_TaxID=65093 {ECO:0000313|EMBL:AFZ45650.1, ECO:0000313|Proteomes:UP000010481};
RN   [1] {ECO:0000313|Proteomes:UP000010481}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7418 {ECO:0000313|Proteomes:UP000010481};
RX   PubMed=23277585; DOI=10.1073/pnas.1217107110;
RA   Shih P.M., Wu D., Latifi A., Axen S.D., Fewer D.P., Talla E., Calteau A.,
RA   Cai F., Tandeau de Marsac N., Rippka R., Herdman M., Sivonen K.,
RA   Coursin T., Laurent T., Goodwin L., Nolan M., Davenport K.W., Han C.S.,
RA   Rubin E.M., Eisen J.A., Woyke T., Gugger M., Kerfeld C.A.;
RT   "Improving the coverage of the cyanobacterial phylum using diversity-driven
RT   genome sequencing.";
RL   Proc. Natl. Acad. Sci. U.S.A. 110:1053-1058(2013).
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 in the photorespiration process. Both reactions occur
CC       simultaneously and in competition at the same active site. Although the
CC       small subunit is not catalytic it is essential for maximal activity.
CC       {ECO:0000256|HAMAP-Rule:MF_00859}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000256|HAMAP-Rule:MF_00859}.
CC   -!- SUBCELLULAR LOCATION: Carboxysome {ECO:0000256|HAMAP-Rule:MF_00859}.
CC   -!- MISCELLANEOUS: The basic functional RuBisCO is composed of a large
CC       chain homodimer in a 'head-to-tail' conformation. In form I RuBisCO
CC       this homodimer is arranged in a barrel-like tetramer with the small
CC       subunits forming a tetrameric 'cap' on each end of the 'barrel'.
CC       {ECO:0000256|HAMAP-Rule:MF_00859}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000256|HAMAP-Rule:MF_00859}.
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DR   EMBL; CP003945; AFZ45650.1; -; Genomic_DNA.
DR   RefSeq; WP_015227522.1; NC_019779.1.
DR   AlphaFoldDB; K9YGX8; -.
DR   STRING; 65093.PCC7418_3539; -.
DR   KEGG; hao:PCC7418_3539; -.
DR   PATRIC; fig|65093.3.peg.3741; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_3; -.
DR   OrthoDB; 9788955at2; -.
DR   Proteomes; UP000010481; Chromosome.
DR   GO; GO:0031470; C:carboxysome; IEA:UniProtKB-SubCell.
DR   GO; GO:0016984; F:ribulose-bisphosphate carboxylase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009853; P:photorespiration; IEA:UniProtKB-KW.
DR   GO; GO:0019253; P:reductive pentose-phosphate cycle; IEA:UniProtKB-UniRule.
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   Bacterial microcompartment {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Calvin cycle {ECO:0000256|ARBA:ARBA00022567, ECO:0000256|HAMAP-
KW   Rule:MF_00859};
KW   Carbon dioxide fixation {ECO:0000256|ARBA:ARBA00023300, ECO:0000256|HAMAP-
KW   Rule:MF_00859}; Carboxysome {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Lyase {ECO:0000313|EMBL:AFZ45650.1};
KW   Photorespiration {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Photosynthesis {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Reference proteome {ECO:0000313|Proteomes:UP000010481}.
FT   DOMAIN          9..106
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   111 AA;  13134 MW;  2B68B3F12902A02F CRC64;
     MKTTPKQAHY ETLSYLPPLT DQQIAKQIQY MLDQDFIPAV EFEESPSPED HHWTLWKLPL
     FDATSPQDVL NEVRECRSEY SNCYIRVVGF DNIRQCQMVS FIVYKPDGIR Y
//