ID   RBS2_ACIFR              Reviewed;         118 AA.
AC   Q07088;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   25-MAY-2022, entry version 86.
DE   RecName: Full=Ribulose bisphosphate carboxylase small subunit 2 {ECO:0000255|HAMAP-Rule:MF_00859};
DE            Short=RuBisCO small subunit 2 {ECO:0000255|HAMAP-Rule:MF_00859};
GN   Name=cbbS2 {ECO:0000255|HAMAP-Rule:MF_00859}; Synonyms=rbcS2;
OS   Acidithiobacillus ferrooxidans (Thiobacillus ferrooxidans).
OC   Bacteria; Proteobacteria; Acidithiobacillia; Acidithiobacillales;
OC   Acidithiobacillaceae; Acidithiobacillus.
OX   NCBI_TaxID=920;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=1959634; DOI=10.1016/0014-5793(91)80840-y;
RA   Pulgar V., Gaete L., Allende J., Orellana O., Jordana X., Jedlicki E.;
RT   "Isolation and nucleotide sequence of the Thiobacillus ferrooxidans genes
RT   for the small and large subunits of ribulose 1,5-bisphosphate
RT   carboxylase/oxygenase.";
RL   FEBS Lett. 292:85-89(1991).
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_00859}.
CC   -!- SUBUNIT: Heterohexadecamer of 8 large and 8 small subunits.
CC       {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}.
CC   -!- CAUTION: In A.ferrooxidans two similar set of genes code for RuBisCO
CC       large and small chains: the rbcL1-rbcS1 and the rbcL2-rbcS2 sets.
CC       {ECO:0000305}.
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DR   EMBL; X70355; CAA49815.1; -; Genomic_DNA.
DR   PIR; S18316; S18316.
DR   AlphaFoldDB; Q07088; -.
DR   SMR; Q07088; -.
DR   STRING; 380394.Lferr_2661; -.
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   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; PTHR31262; 1.
DR   Pfam; PF00101; RuBisCO_small; 1.
DR   SMART; SM00961; RuBisCO_small; 1.
DR   SUPFAM; SSF55239; SSF55239; 1.
PE   3: Inferred from homology;
KW   Calvin cycle; Carbon dioxide fixation.
FT   CHAIN           1..118
FT                   /note="Ribulose bisphosphate carboxylase small subunit 2"
FT                   /id="PRO_0000198630"
SQ   SEQUENCE   118 AA;  13627 MW;  1B063498DECA6DD3 CRC64;
     MSEVQDYKSR LSDPASAKFE TLSYLPALTA DEIRQQVAYI VSKGWNPAVE HTEPENAFGN
     YWYMWKLPMF GETDVDTILK EAERCHKRNP HNHVRIVGYD NFKQSQGTSL VVYRGKTV