ID   K9XAV9_9CHRO            Unreviewed;       115 AA.
AC   K9XAV9;
DT   06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT   06-MAR-2013, sequence version 1.
DT   24-JAN-2024, entry version 37.
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=Glo7428_1044 {ECO:0000313|EMBL:AFZ29618.1};
OS   Gloeocapsa sp. PCC 7428.
OC   Bacteria; Cyanobacteriota; Cyanophyceae; Oscillatoriophycideae;
OC   Chroococcales; Chroococcaceae; Gloeocapsa.
OX   NCBI_TaxID=1173026 {ECO:0000313|EMBL:AFZ29618.1, ECO:0000313|Proteomes:UP000010476};
RN   [1] {ECO:0000313|EMBL:AFZ29618.1, ECO:0000313|Proteomes:UP000010476}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7428 {ECO:0000313|EMBL:AFZ29618.1,
RC   ECO:0000313|Proteomes:UP000010476};
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 Gloeocapsa sp. PCC 7428.";
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; CP003646; AFZ29618.1; -; Genomic_DNA.
DR   RefSeq; WP_015187494.1; NC_019745.1.
DR   AlphaFoldDB; K9XAV9; -.
DR   STRING; 1173026.Glo7428_1044; -.
DR   KEGG; glp:Glo7428_1044; -.
DR   PATRIC; fig|1173026.3.peg.1107; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_3; -.
DR   OrthoDB; 9788955at2; -.
DR   Proteomes; UP000010476; 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:AFZ29618.1};
KW   Photorespiration {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Photosynthesis {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Reference proteome {ECO:0000313|Proteomes:UP000010476}.
FT   DOMAIN          9..106
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   115 AA;  13440 MW;  742D5B8C1736FFA1 CRC64;
     MQTLPKERRY ETLSYLPPLS DAQITKQIQY ILNQGYIPAV EFNESSEPEQ HYWTLWKLPL
     FGARSTQEVL SEVQACRSEY GNCYIRVVGF DNVKQCQILS FIVHKPNQNS YGGRY
//