ID   RBS_PARMW               Reviewed;         113 AA.
AC   P0A4S5; P96487;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   15-MAR-2005, sequence version 1.
DT   03-AUG-2022, entry version 88.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit {ECO:0000255|HAMAP-Rule:MF_00859};
DE            Short=RuBisCO small subunit {ECO:0000255|HAMAP-Rule:MF_00859};
GN   Name=cbbS {ECO:0000255|HAMAP-Rule:MF_00859};
GN   Synonyms=rbcS {ECO:0000255|HAMAP-Rule:MF_00859};
GN   OrderedLocusNames=SYNW1717;
OS   Parasynechococcus marenigrum (strain WH8102).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Parasynechococcus; Parasynechococcus marenigrum.
OX   NCBI_TaxID=84588;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=WH8102;
RX   PubMed=12917641; DOI=10.1038/nature01943;
RA   Palenik B., Brahamsha B., Larimer F.W., Land M.L., Hauser L., Chain P.,
RA   Lamerdin J.E., Regala W., Allen E.E., McCarren J., Paulsen I.T.,
RA   Dufresne A., Partensky F., Webb E.A., Waterbury J.;
RT   "The genome of a motile marine Synechococcus.";
RL   Nature 424:1037-1042(2003).
RN   [2]
RP   IDENTIFICATION BY MASS SPECTROMETRY, SUBCELLULAR LOCATION, AND INDUCTION.
RC   STRAIN=WH8102;
RX   PubMed=31507578; DOI=10.3389/fmicb.2019.01976;
RA   Li Y.Y., Chen X.H., Xue C., Zhang H., Sun G., Xie Z.X., Lin L., Wang D.Z.;
RT   "Proteomic Response to Rising Temperature in the Marine Cyanobacterium
RT   Synechococcus Grown in Different Nitrogen Sources.";
RL   Front. Microbiol. 10:1976-1976(2019).
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:0000255|HAMAP-Rule:MF_00859}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000255|HAMAP-Rule:MF_00859}.
CC   -!- SUBCELLULAR LOCATION: Carboxysome {ECO:0000255|HAMAP-Rule:MF_00859,
CC       ECO:0000305|PubMed:31507578}. Note=This cyanobacterium makes alpha-type
CC       carboxysomes. {ECO:0000305}.
CC   -!- INDUCTION: Cells grown on urea as a nitrogen source have more enzyme
CC       activity than those grown on nitrate (at protein level). RuBisCO
CC       activity of urea- but not nitrate-grown cells decreases with rising
CC       temperature (from 25 to 28 degrees Celsius, present versus predicted
CC       future ocean temperatures); there is only one RuBisCO in this
CC       cyanobacterium. {ECO:0000269|PubMed:31507578}.
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:0000255|HAMAP-Rule:MF_00859}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000255|HAMAP-Rule:MF_00859}.
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DR   EMBL; BX569693; CAE08232.1; -; Genomic_DNA.
DR   RefSeq; WP_006043651.1; NC_005070.1.
DR   AlphaFoldDB; P0A4S5; -.
DR   SMR; P0A4S5; -.
DR   STRING; 84588.SYNW1717; -.
DR   EnsemblBacteria; CAE08232; CAE08232; SYNW1717.
DR   KEGG; syw:SYNW1717; -.
DR   eggNOG; COG4451; Bacteria.
DR   HOGENOM; CLU_098114_2_0_3; -.
DR   OMA; KQCQVLS; -.
DR   OrthoDB; 1708389at2; -.
DR   Proteomes; UP000001422; Chromosome.
DR   GO; GO:0031470; C:carboxysome; IEA:UniProtKB-SubCell.
DR   GO; GO:0009853; P:photorespiration; IEA:UniProtKB-KW.
DR   GO; GO:0019253; P:reductive pentose-phosphate cycle; IEA:UniProtKB-KW.
DR   CDD; cd03527; RuBisCO_small; 1.
DR   Gene3D; 3.30.190.10; -; 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; PTHR31262; 1.
DR   Pfam; PF00101; RuBisCO_small; 1.
DR   SMART; SM00961; RuBisCO_small; 1.
DR   SUPFAM; SSF55239; SSF55239; 1.
PE   1: Evidence at protein level;
KW   Bacterial microcompartment; Calvin cycle; Carbon dioxide fixation;
KW   Carboxysome; Photorespiration; Photosynthesis.
FT   CHAIN           1..113
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /id="PRO_0000198626"
SQ   SEQUENCE   113 AA;  12943 MW;  8929415D336391F4 CRC64;
     MPFQSTVGDY QTVATLETFG FLPPMTQDEI YDQIAYIIAQ GWSPLVEHVH PSNSMATYWS
     YWKLPFFGEK DLNVVVSELE ACHRAYPDHH VRIVGYDAYT QSQGACFVVF EGR