ID   E1Z3C9_CHLVA            Unreviewed;       184 AA.
AC   E1Z3C9;
DT   30-NOV-2010, integrated into UniProtKB/TrEMBL.
DT   30-NOV-2010, sequence version 1.
DT   27-MAR-2024, entry version 50.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit, chloroplastic {ECO:0000256|HAMAP-Rule:MF_00860};
DE            Short=RuBisCO small subunit {ECO:0000256|HAMAP-Rule:MF_00860};
GN   Name=RBCS {ECO:0000256|HAMAP-Rule:MF_00860};
GN   ORFNames=CHLNCDRAFT_29368 {ECO:0000313|EMBL:EFN60145.1};
OS   Chlorella variabilis (Green alga).
OC   Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Trebouxiophyceae;
OC   Chlorellales; Chlorellaceae; Chlorella clade; Chlorella.
OX   NCBI_TaxID=554065 {ECO:0000313|Proteomes:UP000008141};
RN   [1] {ECO:0000313|EMBL:EFN60145.1, ECO:0000313|Proteomes:UP000008141}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=NC64A {ECO:0000313|EMBL:EFN60145.1,
RC   ECO:0000313|Proteomes:UP000008141};
RX   PubMed=20852019; DOI=10.1105/tpc.110.076406;
RA   Blanc G., Duncan G., Agarkova I., Borodovsky M., Gurnon J., Kuo A.,
RA   Lindquist E., Lucas S., Pangilinan J., Polle J., Salamov A., Terry A.,
RA   Yamada T., Dunigan D.D., Grigoriev I.V., Claverie J.M., Van Etten J.L.;
RT   "The Chlorella variabilis NC64A genome reveals adaptation to
RT   photosymbiosis, coevolution with viruses, and cryptic sex.";
RL   Plant Cell 22:2943-2955(2010).
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:0000256|HAMAP-Rule:MF_00860,
CC       ECO:0000256|RuleBase:RU003627}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000256|HAMAP-Rule:MF_00860, ECO:0000256|RuleBase:RU003627}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast {ECO:0000256|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:0000256|HAMAP-Rule:MF_00860}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000256|HAMAP-Rule:MF_00860, ECO:0000256|RuleBase:RU003627}.
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DR   EMBL; GL433835; EFN60145.1; -; Genomic_DNA.
DR   RefSeq; XP_005852247.1; XM_005852185.1.
DR   AlphaFoldDB; E1Z3C9; -.
DR   SMR; E1Z3C9; -.
DR   STRING; 554065.E1Z3C9; -.
DR   GeneID; 17359197; -.
DR   KEGG; cvr:CHLNCDRAFT_29368; -.
DR   eggNOG; ENOG502QTPB; Eukaryota.
DR   InParanoid; E1Z3C9; -.
DR   OMA; VIHISYT; -.
DR   OrthoDB; 5482775at2759; -.
DR   Proteomes; UP000008141; Unassembled WGS sequence.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0016984; F:ribulose-bisphosphate carboxylase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009853; P:photorespiration; IEA:UniProtKB-UniRule.
DR   GO; GO:0019253; P:reductive pentose-phosphate cycle; IEA:UniProtKB-UniRule.
DR   CDD; cd03527; RuBisCO_small; 1.
DR   Gene3D; 3.30.190.10; Ribulose bisphosphate carboxylase, small subunit; 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; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 1, CHLOROPLASTIC; 1.
DR   PANTHER; PTHR31262:SF28; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL SUBUNIT, CHLOROPLASTIC 1; 1.
DR   Pfam; PF00101; RuBisCO_small; 1.
DR   PRINTS; PR00152; RUBISCOSMALL.
DR   SMART; SM00961; RuBisCO_small; 1.
DR   SUPFAM; SSF55239; RuBisCO, small subunit; 1.
PE   3: Inferred from homology;
KW   Calvin cycle {ECO:0000256|ARBA:ARBA00022567, ECO:0000256|HAMAP-
KW   Rule:MF_00860};
KW   Carbon dioxide fixation {ECO:0000256|ARBA:ARBA00023300, ECO:0000256|HAMAP-
KW   Rule:MF_00860}; Chloroplast {ECO:0000256|HAMAP-Rule:MF_00860};
KW   Photorespiration {ECO:0000256|ARBA:ARBA00023238, ECO:0000256|HAMAP-
KW   Rule:MF_00860};
KW   Photosynthesis {ECO:0000256|ARBA:ARBA00022531, ECO:0000256|HAMAP-
KW   Rule:MF_00860};
KW   Plastid {ECO:0000256|HAMAP-Rule:MF_00860, ECO:0000256|RuleBase:RU003627};
KW   Reference proteome {ECO:0000313|Proteomes:UP000008141}.
FT   DOMAIN          54..170
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /evidence="ECO:0000259|SMART:SM00961"
SQ   SEQUENCE   184 AA;  20675 MW;  14C8D6EB216CBB93 CRC64;
     MASTVAAIAP VAVRPMASTP LKQAKNTFAA RTVSNGSIKK VSAMQVWTPL NNKMFETFSF
     LPPLTDGEIS RQVDYIVRNG WTPCLEFADA DHAYVDDTST IRLRGNAVPL YYDNRYWCMW
     KLPMFGCTDG QQVLREIQNC RRAFPDAYIR LVGFDSVRQV QVAGLLVNRP ASVRDYQSPS
     TRSV
//