ID   RBS_ANASL               Reviewed;          10 AA.
AC   P83160;
DT   28-NOV-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-DEC-2001, sequence version 1.
DT   02-JUN-2021, entry version 27.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit {ECO:0000255|HAMAP-Rule:MF_00859};
DE            Short=RuBisCO small subunit {ECO:0000255|HAMAP-Rule:MF_00859};
DE   Flags: Fragment;
GN   Name=cbbS {ECO:0000255|HAMAP-Rule:MF_00859};
GN   Synonyms=rbcS {ECO:0000255|HAMAP-Rule:MF_00859};
OS   Anabaena sp. (strain L31).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Anabaena;
OC   unclassified Anabaena.
OX   NCBI_TaxID=29412;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE.
RA   Apte S.K., Uhlemann E., Schmid R., Altendorf K.;
RL   Submitted (OCT-2001) to UniProtKB.
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 in the photorespiration process. Both reactions occur
CC       simultaneously and in competition at the same active site. Although the
CC       small subunit is not catalytic it is essential for maximal activity.
CC       {ECO:0000255|HAMAP-Rule:MF_00859}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {ECO:0000255|HAMAP-Rule:MF_00859}.
CC   -!- SUBCELLULAR LOCATION: Carboxysome {ECO:0000255|HAMAP-Rule:MF_00859}.
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_00859}.
CC   -!- SIMILARITY: Belongs to the RuBisCO small chain family.
CC       {ECO:0000255|HAMAP-Rule:MF_00859}.
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DR   GO; GO:0031470; C:carboxysome; IEA:UniProtKB-SubCell.
DR   GO; GO:0009853; P:photorespiration; IEA:UniProtKB-KW.
DR   GO; GO:0019253; P:reductive pentose-phosphate cycle; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Bacterial microcompartment; Calvin cycle; Carbon dioxide fixation;
KW   Carboxysome; Direct protein sequencing; Photorespiration; Photosynthesis.
FT   CHAIN           1..>10
FT                   /note="Ribulose bisphosphate carboxylase small subunit"
FT                   /id="PRO_0000262943"
FT   NON_TER         10
SQ   SEQUENCE   10 AA;  1322 MW;  8B4E2D0B13276731 CRC64;
     MQTLPKERRY