ID CBIA_GLOVI Reviewed; 452 AA.
AC Q7NF32;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 15-DEC-2003, sequence version 1.
DT 27-MAR-2024, entry version 108.
DE RecName: Full=Cobyrinate a,c-diamide synthase {ECO:0000255|HAMAP-Rule:MF_00027};
DE EC=6.3.5.11 {ECO:0000255|HAMAP-Rule:MF_00027};
DE AltName: Full=Cobyrinic acid a,c-diamide synthetase {ECO:0000255|HAMAP-Rule:MF_00027};
GN Name=cbiA {ECO:0000255|HAMAP-Rule:MF_00027}; Synonyms=cobB;
GN OrderedLocusNames=glr3695;
OS Gloeobacter violaceus (strain ATCC 29082 / PCC 7421).
OC Bacteria; Cyanobacteriota; Cyanophyceae; Gloeobacterales; Gloeobacteraceae;
OC Gloeobacter.
OX NCBI_TaxID=251221;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 29082 / PCC 7421;
RX PubMed=14621292; DOI=10.1093/dnares/10.4.137;
RA Nakamura Y., Kaneko T., Sato S., Mimuro M., Miyashita H., Tsuchiya T.,
RA Sasamoto S., Watanabe A., Kawashima K., Kishida Y., Kiyokawa C., Kohara M.,
RA Matsumoto M., Matsuno A., Nakazaki N., Shimpo S., Takeuchi C., Yamada M.,
RA Tabata S.;
RT "Complete genome structure of Gloeobacter violaceus PCC 7421, a
RT cyanobacterium that lacks thylakoids.";
RL DNA Res. 10:137-145(2003).
CC -!- FUNCTION: Catalyzes the ATP-dependent amidation of the two carboxylate
CC groups at positions a and c of cobyrinate, using either L-glutamine or
CC ammonia as the nitrogen source. {ECO:0000255|HAMAP-Rule:MF_00027}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=2 ATP + cob(II)yrinate + 2 H2O + 2 L-glutamine = 2 ADP +
CC cob(II)yrinate a,c diamide + 2 H(+) + 2 L-glutamate + 2 phosphate;
CC Xref=Rhea:RHEA:26289, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:29985, ChEBI:CHEBI:30616, ChEBI:CHEBI:43474,
CC ChEBI:CHEBI:58359, ChEBI:CHEBI:58537, ChEBI:CHEBI:58894,
CC ChEBI:CHEBI:456216; EC=6.3.5.11; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_00027};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00027};
CC -!- PATHWAY: Cofactor biosynthesis; adenosylcobalamin biosynthesis;
CC cob(II)yrinate a,c-diamide from sirohydrochlorin (anaerobic route):
CC step 10/10. {ECO:0000255|HAMAP-Rule:MF_00027}.
CC -!- DOMAIN: Comprises of two domains. The C-terminal domain contains the
CC binding site for glutamine and catalyzes the hydrolysis of this
CC substrate to glutamate and ammonia. The N-terminal domain is
CC anticipated to bind ATP and cobyrinate and catalyzes the ultimate
CC synthesis of the diamide product. The ammonia produced via the
CC glutaminase domain is probably translocated to the adjacent domain via
CC a molecular tunnel, where it reacts with an activated intermediate.
CC {ECO:0000255|HAMAP-Rule:MF_00027}.
CC -!- MISCELLANEOUS: The a and c carboxylates of cobyrinate are activated for
CC nucleophilic attack via formation of a phosphorylated intermediate by
CC ATP. CbiA catalyzes first the amidation of the c-carboxylate, and then
CC that of the a-carboxylate. {ECO:0000255|HAMAP-Rule:MF_00027}.
CC -!- SIMILARITY: Belongs to the CobB/CbiA family. {ECO:0000255|HAMAP-
CC Rule:MF_00027}.
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DR EMBL; BA000045; BAC91636.1; -; Genomic_DNA.
DR RefSeq; NP_926641.1; NC_005125.1.
DR RefSeq; WP_011143684.1; NC_005125.1.
DR AlphaFoldDB; Q7NF32; -.
DR SMR; Q7NF32; -.
DR STRING; 251221.gene:10761211; -.
DR EnsemblBacteria; BAC91636; BAC91636; BAC91636.
DR KEGG; gvi:glr3695; -.
DR PATRIC; fig|251221.4.peg.3729; -.
DR eggNOG; COG1797; Bacteria.
DR HOGENOM; CLU_022752_2_0_3; -.
DR InParanoid; Q7NF32; -.
DR OrthoDB; 9764035at2; -.
DR PhylomeDB; Q7NF32; -.
DR UniPathway; UPA00148; UER00231.
DR Proteomes; UP000000557; Chromosome.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR GO; GO:0042242; F:cobyrinic acid a,c-diamide synthase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0009236; P:cobalamin biosynthetic process; IEA:UniProtKB-UniRule.
DR GO; GO:0006541; P:glutamine metabolic process; IEA:UniProtKB-KW.
DR CDD; cd05388; CobB_N; 1.
DR CDD; cd03130; GATase1_CobB; 1.
DR Gene3D; 3.40.50.880; -; 1.
DR Gene3D; 3.40.50.300; P-loop containing nucleotide triphosphate hydrolases; 1.
DR HAMAP; MF_00027; CobB_CbiA; 1.
DR InterPro; IPR004484; CbiA/CobB_synth.
DR InterPro; IPR029062; Class_I_gatase-like.
DR InterPro; IPR002586; CobQ/CobB/MinD/ParA_Nub-bd_dom.
DR InterPro; IPR011698; GATase_3.
DR InterPro; IPR027417; P-loop_NTPase.
DR NCBIfam; TIGR00379; cobB; 1.
DR PANTHER; PTHR43873; COBYRINATE A,C-DIAMIDE SYNTHASE; 1.
DR PANTHER; PTHR43873:SF1; COBYRINATE A,C-DIAMIDE SYNTHASE; 1.
DR Pfam; PF01656; CbiA; 1.
DR Pfam; PF07685; GATase_3; 1.
DR SUPFAM; SSF52317; Class I glutamine amidotransferase-like; 1.
DR SUPFAM; SSF52540; P-loop containing nucleoside triphosphate hydrolases; 1.
DR PROSITE; PS51274; GATASE_COBBQ; 1.
PE 3: Inferred from homology;
KW ATP-binding; Cobalamin biosynthesis; Glutamine amidotransferase; Ligase;
KW Magnesium; Nucleotide-binding; Reference proteome.
FT CHAIN 1..452
FT /note="Cobyrinate a,c-diamide synthase"
FT /id="PRO_1000002292"
FT DOMAIN 244..429
FT /note="GATase cobBQ-type"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00027"
FT ACT_SITE 325
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00027"
FT SITE 421
FT /note="Increases nucleophilicity of active site Cys"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00027"
SQ SEQUENCE 452 AA; 49510 MW; 8A660AB2E675F020 CRC64;
MAIIIAAPAS GTGKTTITLA LLAYLKAHAL RVRSFKVGPD YIDPMFHAAV TGQGCVNLDL
FLTDEPFVRA TYHHHCRGQQ AAVIEGVMGL FDGRAGQGDF ASTAHVARLL RLPVILVIDG
SGAGFSVAAT LYGFRRFDPR VRIAGVILNR VGSERHAQIL SEAVRSQGLE LLGTVYKDET
IALPHRHLGL VPVEELSDFR RTQQQLAALA ERSFDWQKLL PLVAIQPTAP APARWEAEPL
PPVRIAVARD RAFSFYYQDN LELLAALGAQ LETFSPLAGE WPDCRGYLLG GGFPELCAGE
LSAKTRFWEG LRGAVARGVP LYAECGGLMV LGEALRTPEG RSHPMAGILE ASCWMGKRTV
LGYRVATALH SSCAVEAGRQ LRGHLFHRSR MEPQPGAPLW QLDDDEQEGW VRGNLHASYL
HLHWGTQAWA ARRFVRRCLA VAFEGKSTPA RF
//
