ID   RBS_CHLMO               Reviewed;         168 AA.
AC   P17537;
DT   01-AUG-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1990, sequence version 1.
DT   25-MAY-2022, entry version 93.
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   Chlamydomonas moewusii (Chlamydomonas eugametos).
OC   Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Chlorophyceae;
OC   CS clade; Chlamydomonadales; Chlamydomonadaceae; Chlamydomonas.
OX   NCBI_TaxID=3054;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RX   PubMed=3224387; DOI=10.1007/bf00521270;
RA   Simard C., Lemieux C., Bellamere G.;
RT   "Cloning and sequencing of a cDNA encoding the small subunit precursor of
RT   ribulose-1,5-bisphosphate carboxylase from Chlamydomonas moewusii.
RT   Evolution of RUBISCO SS polypeptide.";
RL   Curr. Genet. 14:461-470(1988).
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; X13974; CAA32152.1; -; mRNA.
DR   PIR; S10257; S10257.
DR   AlphaFoldDB; P17537; -.
DR   SMR; P17537; -.
DR   PRIDE; P17537; -.
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; IPR036385; RuBisCO_ssu_sf.
DR   PANTHER; PTHR31262; PTHR31262; 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..28
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000250"
FT   CHAIN           29..168
FT                   /note="Ribulose bisphosphate carboxylase small subunit,
FT                   chloroplastic"
FT                   /id="PRO_0000031474"
SQ   SEQUENCE   168 AA;  18908 MW;  D9D9E04F46F7612F CRC64;
     MASIAAKSVS LRAATRRAAP VAAPADARFK VWQPVNNKQY ETFSYLPPLT NQKIGRQVDY
     IINNGWTPCL EFADPSTSFV SNANAVRLQG VSAGYYDNRY WTMWKLPMFG CTDPSQVLRE
     VSACQVAFPN VYIRLVAFDN VKQVQCMGFL VQRPRNAAEY CPLEKRSV