ID   K9U6E7_CHRTP            Unreviewed;       114 AA.
AC   K9U6E7;
DT   06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT   06-MAR-2013, sequence version 1.
DT   27-MAR-2024, entry version 40.
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   ORFNames=Chro_5315 {ECO:0000313|EMBL:AFY90682.1};
OS   Chroococcidiopsis thermalis (strain PCC 7203).
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Chroococcidiopsidales;
OC   Chroococcidiopsidaceae; Chroococcidiopsis.
OX   NCBI_TaxID=251229 {ECO:0000313|EMBL:AFY90682.1, ECO:0000313|Proteomes:UP000010384};
RN   [1] {ECO:0000313|EMBL:AFY90682.1, ECO:0000313|Proteomes:UP000010384}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7203 {ECO:0000313|EMBL:AFY90682.1,
RC   ECO:0000313|Proteomes:UP000010384};
RG   US DOE Joint Genome Institute;
RA   Gugger M., Coursin T., Rippka R., Tandeau De Marsac N., Huntemann M.,
RA   Wei C.-L., Han J., Detter J.C., Han C., Tapia R., Davenport K.,
RA   Daligault H., Erkkila T., Gu W., Munk A.C.C., Teshima H., Xu Y., Chain P.,
RA   Chen A., Krypides N., Mavromatis K., Markowitz V., Szeto E., Ivanova N.,
RA   Mikhailova N., Ovchinnikova G., Pagani I., Pati A., Goodwin L., Peters L.,
RA   Pitluck S., Woyke T., Kerfeld C.;
RT   "Finished chromosome of genome of Chroococcidiopsis thermalis PCC 7203.";
RL   Submitted (JUN-2012) to the EMBL/GenBank/DDBJ databases.
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; CP003597; AFY90682.1; -; Genomic_DNA.
DR   RefSeq; WP_015157220.1; NC_019695.1.
DR   AlphaFoldDB; K9U6E7; -.
DR   STRING; 251229.Chro_5315; -.
DR   KEGG; cthe:Chro_5315; -.
DR   PATRIC; fig|251229.3.peg.6204; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_3; -.
DR   InParanoid; K9U6E7; -.
DR   OrthoDB; 9788955at2; -.
DR   Proteomes; UP000010384; 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   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:AFY90682.1};
KW   Photorespiration {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Photosynthesis {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Reference proteome {ECO:0000313|Proteomes:UP000010384}.
FT   DOMAIN          9..106
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   114 AA;  13200 MW;  AF1FDC53AAB5B5CD CRC64;
     MQTLPKDRRY ETLSYLPPLT DAQISRQVQY ILSQGYIPAI EFNESSEPTE CYWTMWKLPL
     FGAGSTQEVL NEVQACRSQY SNCYIRIVGF DNVKQCQILS FLVHKPNSSG GRYY
//