ID RBS3_AMAHP Reviewed; 180 AA.
AC Q9XGX4;
DT 23-JAN-2002, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1999, sequence version 1.
DT 27-MAR-2024, entry version 87.
DE RecName: Full=Ribulose bisphosphate carboxylase small subunit, chloroplastic 3 {ECO:0000255|HAMAP-Rule:MF_00860};
DE Short=RuBisCO small subunit 3 {ECO:0000255|HAMAP-Rule:MF_00860};
DE Flags: Precursor;
GN Name=RBCS3 {ECO:0000255|HAMAP-Rule:MF_00860};
OS Amaranthus hypochondriacus (Prince-of-Wales feather) (Amaranthus hybridus
OS var. hypochondriacus).
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC Caryophyllales; Amaranthaceae; Amaranthus.
OX NCBI_TaxID=28502;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA].
RC STRAIN=R103;
RA Corey A.C., Dempsey D.A., Klessig D.F., Berry J.O.;
RT "Three RbcS cDNAs from the C4 dicotyledonous plant Amaranthus
RT hypochondriacus.";
RL (er) Plant Gene Register PGR99-101(1999).
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; AF150667; AAD37440.1; -; mRNA.
DR AlphaFoldDB; Q9XGX4; -.
DR SMR; Q9XGX4; -.
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-KW.
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; IPR024680; RuBisCO_ssu_N.
DR InterPro; IPR036385; RuBisCO_ssu_sf.
DR PANTHER; PTHR31262; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 1, CHLOROPLASTIC; 1.
DR PANTHER; PTHR31262:SF10; RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL SUBUNIT, CHLOROPLASTIC 2; 1.
DR Pfam; PF12338; RbcS; 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 2: Evidence at transcript level;
KW Calvin cycle; Carbon dioxide fixation; Chloroplast; Photorespiration;
KW Photosynthesis; Plastid; Transit peptide.
FT TRANSIT 1..56
FT /note="Chloroplast"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT CHAIN 57..180
FT /note="Ribulose bisphosphate carboxylase small subunit,
FT chloroplastic 3"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00860"
FT /id="PRO_0000031462"
SQ SEQUENCE 180 AA; 20058 MW; 3F8F0548ABD7E346 CRC64;
MASSLMSNAI TAVVGASGAQ ANMVAPFNGL KSIASFPVTR KSNDITSIAS NGGRVQCMQV
WPPVGKKKFE TLSYLPPLSD AQLLAQVQYL LNNGWIPCIE FELEHPFVYR ENHRSPGYQD
GRYWTMWKLP MYGCTDPAQV LNEVEEAKKA YPSAFIRIIG FDNKRQVQCV SFIAFKPPGY
//
