ID   CARA_THET2              Reviewed;         391 AA.
AC   Q72GZ0;
DT   01-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   25-MAY-2022, entry version 102.
DE   RecName: Full=Carbamoyl-phosphate synthase small chain {ECO:0000255|HAMAP-Rule:MF_01209};
DE            EC=6.3.5.5 {ECO:0000255|HAMAP-Rule:MF_01209};
DE   AltName: Full=Carbamoyl-phosphate synthetase glutamine chain {ECO:0000255|HAMAP-Rule:MF_01209};
GN   Name=carA {ECO:0000255|HAMAP-Rule:MF_01209}; OrderedLocusNames=TT_C1706;
OS   Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27).
OC   Bacteria; Deinococcus-Thermus; Deinococci; Thermales; Thermaceae; Thermus.
OX   NCBI_TaxID=262724;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-163 / DSM 7039 / HB27;
RX   PubMed=15064768; DOI=10.1038/nbt956;
RA   Henne A., Brueggemann H., Raasch C., Wiezer A., Hartsch T., Liesegang H.,
RA   Johann A., Lienard T., Gohl O., Martinez-Arias R., Jacobi C.,
RA   Starkuviene V., Schlenczeck S., Dencker S., Huber R., Klenk H.-P.,
RA   Kramer W., Merkl R., Gottschalk G., Fritz H.-J.;
RT   "The genome sequence of the extreme thermophile Thermus thermophilus.";
RL   Nat. Biotechnol. 22:547-553(2004).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 ATP + H2O + hydrogencarbonate + L-glutamine = 2 ADP +
CC         carbamoyl phosphate + 2 H(+) + L-glutamate + phosphate;
CC         Xref=Rhea:RHEA:18633, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:17544, ChEBI:CHEBI:29985, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:43474, ChEBI:CHEBI:58228, ChEBI:CHEBI:58359,
CC         ChEBI:CHEBI:456216; EC=6.3.5.5; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01209};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-arginine biosynthesis; carbamoyl
CC       phosphate from bicarbonate: step 1/1. {ECO:0000255|HAMAP-
CC       Rule:MF_01209}.
CC   -!- PATHWAY: Pyrimidine metabolism; UMP biosynthesis via de novo pathway;
CC       (S)-dihydroorotate from bicarbonate: step 1/3. {ECO:0000255|HAMAP-
CC       Rule:MF_01209}.
CC   -!- SUBUNIT: Composed of two chains; the small (or glutamine) chain
CC       promotes the hydrolysis of glutamine to ammonia, which is used by the
CC       large (or ammonia) chain to synthesize carbamoyl phosphate.
CC       {ECO:0000255|HAMAP-Rule:MF_01209}.
CC   -!- SIMILARITY: Belongs to the CarA family. {ECO:0000255|HAMAP-
CC       Rule:MF_01209}.
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DR   EMBL; AE017221; AAS82048.1; -; Genomic_DNA.
DR   RefSeq; WP_011174069.1; NC_005835.1.
DR   AlphaFoldDB; Q72GZ0; -.
DR   SMR; Q72GZ0; -.
DR   STRING; 262724.TT_C1706; -.
DR   MEROPS; C26.A04; -.
DR   EnsemblBacteria; AAS82048; AAS82048; TT_C1706.
DR   GeneID; 3169366; -.
DR   KEGG; tth:TT_C1706; -.
DR   eggNOG; COG0505; Bacteria.
DR   HOGENOM; CLU_035901_2_1_0; -.
DR   OMA; CFNTGMT; -.
DR   OrthoDB; 662268at2; -.
DR   UniPathway; UPA00068; UER00171.
DR   UniPathway; UPA00070; UER00115.
DR   Proteomes; UP000000592; Chromosome.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004088; F:carbamoyl-phosphate synthase (glutamine-hydrolyzing) activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006207; P:'de novo' pyrimidine nucleobase biosynthetic process; IEA:InterPro.
DR   GO; GO:0044205; P:'de novo' UMP biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0006526; P:arginine biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0006541; P:glutamine metabolic process; IEA:UniProtKB-KW.
DR   CDD; cd01744; GATase1_CPSase; 1.
DR   Gene3D; 3.40.50.880; -; 1.
DR   Gene3D; 3.50.30.20; -; 1.
DR   HAMAP; MF_01209; CPSase_S_chain; 1.
DR   InterPro; IPR006274; CarbamoylP_synth_ssu.
DR   InterPro; IPR002474; CarbamoylP_synth_ssu_N.
DR   InterPro; IPR036480; CarbP_synth_ssu_N_sf.
DR   InterPro; IPR029062; Class_I_gatase-like.
DR   InterPro; IPR035686; CPSase_GATase1.
DR   InterPro; IPR017926; GATASE.
DR   Pfam; PF00988; CPSase_sm_chain; 1.
DR   Pfam; PF00117; GATase; 1.
DR   SMART; SM01097; CPSase_sm_chain; 1.
DR   SUPFAM; SSF52021; SSF52021; 1.
DR   SUPFAM; SSF52317; SSF52317; 1.
DR   TIGRFAMs; TIGR01368; CPSaseIIsmall; 1.
DR   PROSITE; PS51273; GATASE_TYPE_1; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Arginine biosynthesis; ATP-binding;
KW   Glutamine amidotransferase; Ligase; Nucleotide-binding;
KW   Pyrimidine biosynthesis.
FT   CHAIN           1..391
FT                   /note="Carbamoyl-phosphate synthase small chain"
FT                   /id="PRO_0000112341"
FT   DOMAIN          191..376
FT                   /note="Glutamine amidotransferase type-1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01209"
FT   REGION          1..187
FT                   /note="CPSase"
FT   ACT_SITE        266
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01209"
FT   ACT_SITE        349
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01209"
FT   ACT_SITE        351
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01209"
SQ   SEQUENCE   391 AA;  43117 MW;  FE18392E2AC9245D CRC64;
     MAGVKERAVL VLEDGTVYHG YAFGARGKTV GEVVFNTAQT GYQEIMTDPS YHGQIVVMTY
     PHQGNYGVNV YDMQSNRPWV RGFVAKEFSR VASNPRAQQT IGEFMEFYGV VGIEGIDTRA
     LVRKIREGGV LKGTIAHASL FGAPDHAFTQ EELEALRREA QAWTDIDGRD MTPEVSTPLP
     YAWPTLKSGR RIVVMDFGIK HAIVENLAAL GFEVIVVPGK TPAHQIMALE PHGLLISNGP
     GDPTMPRYAH ETIWKLMGLL PTFGICLGHQ LLALAAGGRT FKMKFGHRGA NHPVKNLQTG
     KIEITSQNHG YAVDIDSLKD FRPTHVNLND GTLEGMAHAR YPVFSVQYHP EAAPGPHDAL
     YLFRRFLEEV EAFHGATGLP VEKQRADQHG I