ID   RBS_TRIRP               Reviewed;         178 AA.
AC   P17673;
DT   01-AUG-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1990, sequence version 1.
DT   25-MAY-2022, entry version 100.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit, chloroplastic {ECO:0000255|HAMAP-Rule:MF_00860};
DE            Short=RuBisCO small subunit {ECO:0000255|HAMAP-Rule:MF_00860};
DE   Flags: Precursor;
GN   Name=RBCS {ECO:0000255|HAMAP-Rule:MF_00860};
OS   Trifolium repens (Creeping white clover).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Fabales; Fabaceae; Papilionoideae; 50 kb inversion clade;
OC   NPAAA clade; Hologalegina; IRL clade; Trifolieae; Trifolium.
OX   NCBI_TaxID=3899;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=cv. Huia;
RX   PubMed=2395652; DOI=10.1093/nar/18.16.4914;
RA   Ellison N., Yu P.L., White D.W.R.;
RT   "Nucleotide sequence of a white clover ribulose bisphosphate carboxylase
RT   small subunit gene.";
RL   Nucleic Acids Res. 18:4914-4914(1990).
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; X52293; CAA36542.1; -; Genomic_DNA.
DR   PIR; S12704; RKJYS.
DR   AlphaFoldDB; P17673; -.
DR   SMR; P17673; -.
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; Transit peptide.
FT   TRANSIT         1..54
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT   CHAIN           55..178
FT                   /note="Ribulose bisphosphate carboxylase small subunit,
FT                   chloroplastic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT                   /id="PRO_0000031561"
SQ   SEQUENCE   178 AA;  20038 MW;  CB7966C11692A1E1 CRC64;
     MALISSAAVT TINRAPVQAN LATPFTGLKS SAGFPVTKKN NDITSITSNG SRVNCMQVWP
     PVGKKKFETL SYLPPLTDEQ LLKEVEYLLR KGWVPCVEFE LEKGFVHRQY NSSPGYYDGR
     YWTMWRLPLF GTTDAAQVLK EVAECKAEYP EAFIRIIGFD NVRQVQCISF IASTPKVY