ID   Q6N9I9_RHOPA            Unreviewed;       140 AA.
AC   Q6N9I9;
DT   05-JUL-2004, integrated into UniProtKB/TrEMBL.
DT   05-JUL-2004, sequence version 1.
DT   27-MAR-2024, entry version 104.
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:CAE27001.1};
GN   OrderedLocusNames=RPA1560 {ECO:0000313|EMBL:CAE27001.1};
OS   Rhodopseudomonas palustris (strain ATCC BAA-98 / CGA009).
OC   Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC   Nitrobacteraceae; Rhodopseudomonas.
OX   NCBI_TaxID=258594 {ECO:0000313|EMBL:CAE27001.1, ECO:0000313|Proteomes:UP000001426};
RN   [1] {ECO:0000313|EMBL:CAE27001.1, ECO:0000313|Proteomes:UP000001426}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-98 / CGA009 {ECO:0000313|Proteomes:UP000001426};
RX   PubMed=14704707; DOI=10.1038/nbt923;
RA   Larimer F.W., Chain P., Hauser L., Lamerdin J., Malfatti S., Do L.,
RA   Land M.L., Pelletier D.A., Beatty T.J., Lang A.S., Tabita F.R.,
RA   Gibson J.L., Hanson T.E., Torres y Torres J., Peres C., Harrison F.H.,
RA   Gibson J., Harwood C.S.;
RT   "Complete genome sequence of the metabolically versatile photosynthetic
RT   bacterium Rhodopseudomonas palustris.";
RL   Nat. Biotechnol. 22:55-61(2004).
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; BX572597; CAE27001.1; -; Genomic_DNA.
DR   RefSeq; WP_011157119.1; NZ_CP116810.1.
DR   AlphaFoldDB; Q6N9I9; -.
DR   SMR; Q6N9I9; -.
DR   STRING; 258594.RPA1560; -.
DR   GeneID; 66892590; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_5; -.
DR   PhylomeDB; Q6N9I9; -.
DR   Proteomes; UP000001426; 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:CAE27001.1};
KW   Photorespiration {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Photosynthesis {ECO:0000256|HAMAP-Rule:MF_00859};
KW   Reference proteome {ECO:0000313|Proteomes:UP000001426}.
FT   DOMAIN          4..103
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
FT   REGION          109..140
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   140 AA;  16301 MW;  37E421090EC3F8FF CRC64;
     MRLTQGCFSF LPDLTDEQIA AQVQYALSKG WAVNLEFTDD PHPRNTYWDM WGLPMFDLQD
     AAGVMMELNE CRKIYGDRYI RLSAFDSSHG WESVRLSFIV NRPKDEPGFR LDRQESDGRN
     MRYTTRAYSA DKPEGRRYGG
//