ID   I3X726_SINF2            Unreviewed;       129 AA.
AC   I3X726;
DT   05-SEP-2012, integrated into UniProtKB/TrEMBL.
DT   05-SEP-2012, sequence version 1.
DT   24-JAN-2024, entry version 60.
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:AFL51682.1};
GN   ORFNames=USDA257_c31140 {ECO:0000313|EMBL:AFL51682.1};
OS   Sinorhizobium fredii (strain USDA 257).
OC   Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC   Rhizobiaceae; Sinorhizobium/Ensifer group; Sinorhizobium.
OX   NCBI_TaxID=1185652 {ECO:0000313|EMBL:AFL51682.1, ECO:0000313|Proteomes:UP000006180};
RN   [1] {ECO:0000313|EMBL:AFL51682.1, ECO:0000313|Proteomes:UP000006180}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=USDA 257 {ECO:0000313|EMBL:AFL51682.1,
RC   ECO:0000313|Proteomes:UP000006180};
RX   PubMed=22843606; DOI=10.1128/JB.00966-12;
RA   Schuldes J., Rodriguez Orbegoso M., Schmeisser C., Krishnan H.B.,
RA   Daniel R., Streit W.R.;
RT   "Complete genome sequence of the broad-host-range strain Sinorhizobium
RT   fredii USDA257.";
RL   J. Bacteriol. 194:4483-4483(2012).
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; CP003563; AFL51682.1; -; Genomic_DNA.
DR   RefSeq; WP_014763844.1; NC_018000.1.
DR   AlphaFoldDB; I3X726; -.
DR   STRING; 1185652.USDA257_c31140; -.
DR   KEGG; sfd:USDA257_c31140; -.
DR   PATRIC; fig|1185652.3.peg.3236; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_5; -.
DR   Proteomes; UP000006180; Chromosome.
DR   GO; GO:0016984; F:ribulose-bisphosphate carboxylase activity; IEA:UniProtKB-UniRule.
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:AFL51682.1}.
FT   DOMAIN          4..103
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   129 AA;  15123 MW;  D6648E154B430C97 CRC64;
     MRITQGCFSF LPDLTDEQIT AQVEYCLGKG WAIGVEYTDD PHPRNTYWEM WGNPMFDLKD
     AKGVMMELED CRKAHAQDYI RLNAFDSSRG LETVTMSFIV NRPDNEPTLR MTRTESRGRS
     QRYAWETQR
//