ID   RBS_HEVBR               Reviewed;         183 AA.
AC   P29684;
DT   01-APR-1993, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1993, sequence version 1.
DT   25-MAY-2022, entry version 95.
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}; Synonyms=RBSS;
OS   Hevea brasiliensis (Para rubber tree) (Siphonia brasiliensis).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Malpighiales; Euphorbiaceae; Crotonoideae; Micrandreae;
OC   Hevea.
OX   NCBI_TaxID=3981;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RX   PubMed=1840682; DOI=10.1007/bf00016079;
RA   Chye M.-L., Tan S., Tan C.-T., Kush A., Chua N.-H.;
RT   "Nucleotide sequence of a cDNA clone encoding the precursor of ribulose-
RT   1,5-bisphosphate carboxylase small subunit from Hevea brasiliensis (rubber
RT   tree).";
RL   Plant Mol. Biol. 16:1077-1078(1991).
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; M60274; AAA33361.1; -; mRNA.
DR   PIR; S16272; S16272.
DR   AlphaFoldDB; P29684; -.
DR   SMR; P29684; -.
DR   OrthoDB; 1258997at2759; -.
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   2: Evidence at transcript level;
KW   Calvin cycle; Carbon dioxide fixation; Chloroplast; Photorespiration;
KW   Photosynthesis; Plastid; Transit peptide.
FT   TRANSIT         1..58
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT   CHAIN           59..183
FT                   /note="Ribulose bisphosphate carboxylase small subunit,
FT                   chloroplastic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT                   /id="PRO_0000031508"
SQ   SEQUENCE   183 AA;  20721 MW;  6EE744AC34E27151 CRC64;
     MASSMLSTAA VACINRASPA QASMVAPFTG LKSTSAFPTT RKTTTDITSI ASNGGRVQCM
     QVWPPRGKKF YETLSYLPPL TREQLAKEVE YLLRKGWVPC LEFELEHGTV YREYHRSPGY
     YDGRYWTMWK LPMFGCTDAV QVLQELDEMI KAYPDCYGRI IGFDNVRQVQ CISFLAYKPK
     GAE