ID   RBS4_SOLTU              Reviewed;         180 AA.
AC   P26576;
DT   01-AUG-1992, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1992, sequence version 1.
DT   03-AUG-2022, entry version 105.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit, chloroplastic 4 {ECO:0000255|HAMAP-Rule:MF_00860};
DE            Short=RuBisCO small subunit 4 {ECO:0000255|HAMAP-Rule:MF_00860};
DE   AltName: Full=Ribulose bisphosphate carboxylase small chain 2B, chloroplastic;
DE            Short=RuBisCO small subunit 2B;
DE   Flags: Precursor;
GN   Name=RBCS4 {ECO:0000255|HAMAP-Rule:MF_00860}; Synonyms=RBCS-2B;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3422467; DOI=10.1073/pnas.85.3.846;
RA   Wolter F.P., Fritz C.C., Willmitzer L., Schell J., Schreier P.H.;
RT   "rbcS genes in Solanum tuberosum: conservation of transit peptide and exon
RT   shuffling during evolution.";
RL   Proc. Natl. Acad. Sci. U.S.A. 85:846-850(1988).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=cv. AM 80.5793;
RA   Fritz C.C., Wolter F.P., Schenkemeyer V., Herget T., Schreier P.H.;
RL   Submitted (DEC-1992) 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. 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:0000255|HAMAP-Rule:MF_00860}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000255|HAMAP-Rule:MF_00860}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast {ECO:0000255|HAMAP-
CC       Rule:MF_00860}.
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_00860}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000255|HAMAP-Rule:MF_00860}.
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DR   EMBL; X69761; CAA49415.1; -; Genomic_DNA.
DR   PIR; D31083; RKPO2B.
DR   AlphaFoldDB; P26576; -.
DR   SMR; P26576; -.
DR   PRIDE; P26576; -.
DR   InParanoid; P26576; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   ExpressionAtlas; P26576; baseline and differential.
DR   GO; GO:0009507; C:chloroplast; 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; IPR024680; RuBisCO_ssu_N.
DR   InterPro; IPR036385; RuBisCO_ssu_sf.
DR   PANTHER; PTHR31262; PTHR31262; 1.
DR   Pfam; PF12338; RbcS; 1.
DR   Pfam; PF00101; RuBisCO_small; 1.
DR   PRINTS; PR00152; RUBISCOSMALL.
DR   SMART; SM00961; RuBisCO_small; 1.
DR   SUPFAM; SSF55239; SSF55239; 1.
PE   3: Inferred from homology;
KW   Calvin cycle; Carbon dioxide fixation; Chloroplast; Photorespiration;
KW   Photosynthesis; Plastid; Reference proteome; Transit peptide.
FT   TRANSIT         1..56
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT   CHAIN           57..180
FT                   /note="Ribulose bisphosphate carboxylase small subunit,
FT                   chloroplastic 4"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT                   /id="PRO_0000031553"
SQ   SEQUENCE   180 AA;  20301 MW;  64345A12B33B72B4 CRC64;
     MASSIVSSAA VATRANGAQA SMVGPFTGLK STASFPVSRK QNLDITSIAS NGGRVRCMQV
     WPPINMKKYE TLSYLPDLSD EQLLKEVEYL LKNGWVPCLE FETEHGFVYR ENNKSPGYYD
     GRYWTMWKLP MFGCTDATQV LAEVEEAKKA YPQAWIRIIG FDNVRQVQCI SFIAYKPEGY