ID   RBS_LACSA               Reviewed;         181 AA.
AC   Q40250;
DT   15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   02-DEC-2020, entry version 87.
DE   RecName: Full=Ribulose bisphosphate carboxylase small chain, chloroplastic;
DE            Short=RuBisCO small subunit;
DE            EC=4.1.1.39;
DE   Flags: Precursor;
GN   Name=RBCS;
OS   Lactuca sativa (Garden lettuce).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; campanulids; Asterales; Asteraceae; Cichorioideae; Cichorieae;
OC   Lactucinae; Lactuca.
OX   NCBI_TaxID=4236;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RA   Hanyuu K.;
RL   Submitted (JAN-1993) 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 (By similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 (2R)-3-phosphoglycerate + 2 H(+) = CO2 + D-ribulose 1,5-
CC         bisphosphate + H2O; Xref=Rhea:RHEA:23124, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:16526, ChEBI:CHEBI:57870,
CC         ChEBI:CHEBI:58272; EC=4.1.1.39;
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=D-ribulose 1,5-bisphosphate + O2 = (2R)-3-phosphoglycerate +
CC         2-phosphoglycolate + 2 H(+); Xref=Rhea:RHEA:36631, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:15379, ChEBI:CHEBI:57870, ChEBI:CHEBI:58033,
CC         ChEBI:CHEBI:58272;
CC   -!- SUBUNIT: 8 large chains + 8 small chains.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family. {ECO:0000305}.
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DR   EMBL; D14001; BAA03103.1; -; mRNA.
DR   SMR; Q40250; -.
DR   PRIDE; Q40250; -.
DR   OrthoDB; 1258997at2759; -.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0004497; F:monooxygenase activity; IEA:UniProtKB-KW.
DR   GO; GO:0016984; F:ribulose-bisphosphate carboxylase activity; IEA:UniProtKB-EC.
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   InterPro; IPR024681; RuBisCO_sc.
DR   InterPro; IPR000894; RuBisCO_sc_dom.
DR   InterPro; IPR024680; RuBisCO_ssu_N.
DR   InterPro; IPR036385; RuBisCO_ssu_sf.
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; Lyase; Monooxygenase;
KW   Oxidoreductase; Photorespiration; Photosynthesis; Plastid; Transit peptide.
FT   TRANSIT         1..57
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000250"
FT   CHAIN           58..181
FT                   /note="Ribulose bisphosphate carboxylase small chain,
FT                   chloroplastic"
FT                   /id="PRO_0000031510"
SQ   SEQUENCE   181 AA;  20359 MW;  CE6F3AD4E81F6075 CRC64;
     MASISSSAIA TVNRTTSTQA SLAAPFTGLK SNVAFPVTKK ANNDFSSLPS NGGRVQCMKV
     WPPIGLKKYE TLSYLPPLSD EALSKEIDYL IRNKWIPCLE FELEHGFVYR EHHHSPGYYD
     GRYWTMWKLP MFGCTDSAQV MKEVGECKKE YPNAFIRVIG FDNIRQVQCI SFIVAKPPGV
     L
//