ID   A4YNR2_BRASO            Unreviewed;       139 AA.
AC   A4YNR2;
DT   29-MAY-2007, integrated into UniProtKB/TrEMBL.
DT   29-MAY-2007, sequence version 1.
DT   27-MAR-2024, entry version 76.
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   ECO:0000313|EMBL:CAL75538.1};
GN   OrderedLocusNames=BRADO1660 {ECO:0000313|EMBL:CAL75538.1};
OS   Bradyrhizobium sp. (strain ORS 278).
OC   Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC   Nitrobacteraceae; Bradyrhizobium.
OX   NCBI_TaxID=114615 {ECO:0000313|EMBL:CAL75538.1, ECO:0000313|Proteomes:UP000001994};
RN   [1] {ECO:0000313|EMBL:CAL75538.1, ECO:0000313|Proteomes:UP000001994}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ORS 278 {ECO:0000313|Proteomes:UP000001994};
RX   PubMed=17540897; DOI=10.1126/science.1139548;
RA   Giraud E., Moulin L., Vallenet D., Barbe V., Cytryn E., Avarre J.C.,
RA   Jaubert M., Simon D., Cartieaux F., Prin Y., Bena G., Hannibal L.,
RA   Fardoux J., Kojadinovic M., Vuillet L., Lajus A., Cruveiller S., Rouy Z.,
RA   Mangenot S., Segurens B., Dossat C., Franck W.L., Chang W.S., Saunders E.,
RA   Bruce D., Richardson P., Normand P., Dreyfus B., Pignol D., Stacey G.,
RA   Emerich D., Vermeglio A., Medigue C., Sadowsky M.;
RT   "Legumes symbioses: absence of nod genes in photosynthetic bradyrhizobia.";
RL   Science 316:1307-1312(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|HAMAP-Rule:MF_00859}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000256|ARBA:ARBA00038826, 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; CU234118; CAL75538.1; -; Genomic_DNA.
DR   RefSeq; WP_011924766.1; NC_009445.1.
DR   AlphaFoldDB; A4YNR2; -.
DR   STRING; 114615.BRADO1660; -.
DR   KEGG; bra:BRADO1660; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_5; -.
DR   OrthoDB; 9788955at2; -.
DR   Proteomes; UP000001994; Chromosome.
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   PANTHER; PTHR31262:SF23; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL SUBUNIT; 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   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}; Lyase {ECO:0000313|EMBL:CAL75538.1};
KW   Photorespiration {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Photosynthesis {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Reference proteome {ECO:0000313|Proteomes:UP000001994}.
FT   DOMAIN          4..103
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   139 AA;  16341 MW;  B262CA6A55FC4FEE CRC64;
     MRVTQGCFSF LPDLTDDQIA AQIQYCLEKG WAVNIEFTDD PHPRNTYWEM WGLPMFDLRD
     AAGIMRELAE CRKIYGDRYI RISAFDSSHG WESTRLSFIV NRPKTEPGFR LDRQETVGRN
     LRYSTRSYAA ERPEGERYS
//