ID   RBS_PHYPA               Reviewed;          15 AA.
AC   P80657;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   23-FEB-2022, entry version 59.
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: Fragment;
GN   Name=RBCS {ECO:0000255|HAMAP-Rule:MF_00860};
OS   Physcomitrium patens (Spreading-leaved earth moss) (Physcomitrella patens).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Bryophyta;
OC   Bryophytina; Bryopsida; Funariidae; Funariales; Funariaceae; Physcomitrium.
OX   NCBI_TaxID=3218;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Protonema;
RX   PubMed=9129336; DOI=10.1007/s004250050065;
RA   Kasten B., Buck F., Nuske J., Reski R.;
RT   "Cytokinin affects nuclear- and plastome-encoded energy-converting plastid
RT   enzymes.";
RL   Planta 201:261-272(1997).
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   STRING; 3218.PP1S161_16V6.1; -.
DR   Proteomes; UP000006727; Unplaced.
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.
PE   1: Evidence at protein level;
KW   Calvin cycle; Carbon dioxide fixation; Chloroplast;
KW   Direct protein sequencing; Photorespiration; Photosynthesis; Plastid;
KW   Reference proteome.
FT   CHAIN           1..>15
FT                   /note="Ribulose bisphosphate carboxylase small subunit,
FT                   chloroplastic"
FT                   /id="PRO_0000198587"
FT   NON_TER         15
SQ   SEQUENCE   15 AA;  1802 MW;  28B9E7AC4AED6CE0 CRC64;
     XQVWNPIGQP KFETF