BCHB_CHLT3
ID BCHB_CHLT3 Reviewed; 537 AA.
AC B3QZE2;
DT 14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT 02-SEP-2008, sequence version 1.
DT 03-AUG-2022, entry version 67.
DE RecName: Full=Light-independent protochlorophyllide reductase subunit B {ECO:0000255|HAMAP-Rule:MF_00353};
DE Short=DPOR subunit B {ECO:0000255|HAMAP-Rule:MF_00353};
DE Short=LI-POR subunit B {ECO:0000255|HAMAP-Rule:MF_00353};
DE EC=1.3.7.7 {ECO:0000255|HAMAP-Rule:MF_00353};
GN Name=bchB {ECO:0000255|HAMAP-Rule:MF_00353}; OrderedLocusNames=Ctha_1372;
OS Chloroherpeton thalassium (strain ATCC 35110 / GB-78).
OC Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae; Chloroherpeton.
OX NCBI_TaxID=517418;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 35110 / GB-78;
RG US DOE Joint Genome Institute;
RA Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA Bruce D., Goodwin L., Pitluck S., Schmutz J., Larimer F., Land M.,
RA Hauser L., Kyrpides N., Mikhailova N., Liu Z., Li T., Zhao F., Overmann J.,
RA Bryant D.A., Richardson P.;
RT "Complete sequence of Chloroherpeton thalassium ATCC 35110.";
RL Submitted (JUN-2008) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Component of the dark-operative protochlorophyllide reductase
CC (DPOR) that uses Mg-ATP and reduced ferredoxin to reduce ring D of
CC protochlorophyllide (Pchlide) to form chlorophyllide a (Chlide). This
CC reaction is light-independent. The NB-protein (BchN-BchB) is the
CC catalytic component of the complex. {ECO:0000255|HAMAP-Rule:MF_00353}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=2 ADP + chlorophyllide a + oxidized 2[4Fe-4S]-[ferredoxin] + 2
CC phosphate = 2 ATP + 2 H2O + protochlorophyllide a + reduced 2[4Fe-
CC 4S]-[ferredoxin]; Xref=Rhea:RHEA:28202, Rhea:RHEA-COMP:10002,
CC Rhea:RHEA-COMP:10004, ChEBI:CHEBI:15377, ChEBI:CHEBI:30616,
CC ChEBI:CHEBI:33722, ChEBI:CHEBI:33723, ChEBI:CHEBI:43474,
CC ChEBI:CHEBI:83348, ChEBI:CHEBI:83350, ChEBI:CHEBI:456216; EC=1.3.7.7;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00353};
CC -!- COFACTOR:
CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00353};
CC Note=Binds 1 [4Fe-4S] cluster per heterodimer. The cluster is bound at
CC the heterodimer interface by residues from both subunits.
CC {ECO:0000255|HAMAP-Rule:MF_00353};
CC -!- PATHWAY: Porphyrin-containing compound metabolism; bacteriochlorophyll
CC biosynthesis (light-independent). {ECO:0000255|HAMAP-Rule:MF_00353}.
CC -!- SUBUNIT: Protochlorophyllide reductase is composed of three subunits;
CC BchL, BchN and BchB. Forms a heterotetramer of two BchB and two BchN
CC subunits. {ECO:0000255|HAMAP-Rule:MF_00353}.
CC -!- SIMILARITY: Belongs to the ChlB/BchB/BchZ family. {ECO:0000255|HAMAP-
CC Rule:MF_00353}.
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DR EMBL; CP001100; ACF13835.1; -; Genomic_DNA.
DR RefSeq; WP_012499919.1; NC_011026.1.
DR AlphaFoldDB; B3QZE2; -.
DR SMR; B3QZE2; -.
DR STRING; 517418.Ctha_1372; -.
DR EnsemblBacteria; ACF13835; ACF13835; Ctha_1372.
DR KEGG; cts:Ctha_1372; -.
DR eggNOG; COG2710; Bacteria.
DR HOGENOM; CLU_025470_0_0_10; -.
DR OMA; TTFQARD; -.
DR OrthoDB; 363662at2; -.
DR UniPathway; UPA00671; -.
DR Proteomes; UP000001208; Chromosome.
DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-UniRule.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0016730; F:oxidoreductase activity, acting on iron-sulfur proteins as donors; IEA:InterPro.
DR GO; GO:0016636; F:oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor; IEA:UniProtKB-UniRule.
DR GO; GO:0036070; P:light-independent bacteriochlorophyll biosynthetic process; IEA:UniProtKB-UniPathway.
DR GO; GO:0019685; P:photosynthesis, dark reaction; IEA:InterPro.
DR Gene3D; 1.10.8.550; -; 1.
DR HAMAP; MF_00353; ChlB_BchB; 1.
DR InterPro; IPR013580; LI-POR_suB-like_C.
DR InterPro; IPR000510; Nase/OxRdtase_comp1.
DR InterPro; IPR042298; P-CP_red_C.
DR InterPro; IPR005969; Protochl_reductB.
DR InterPro; IPR016209; Protochlorophyllide_Rdtase.
DR Pfam; PF00148; Oxidored_nitro; 1.
DR Pfam; PF08369; PCP_red; 1.
DR PIRSF; PIRSF000163; PCP_ChlB; 1.
DR TIGRFAMs; TIGR01278; DPOR_BchB; 1.
PE 3: Inferred from homology;
KW 4Fe-4S; ATP-binding; Bacteriochlorophyll biosynthesis;
KW Chlorophyll biosynthesis; Iron; Iron-sulfur; Metal-binding;
KW Nucleotide-binding; Oxidoreductase; Photosynthesis; Reference proteome.
FT CHAIN 1..537
FT /note="Light-independent protochlorophyllide reductase
FT subunit B"
FT /id="PRO_1000120526"
FT REGION 459..483
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 292
FT /note="Proton donor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00353"
FT BINDING 36
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="ligand shared with heterodimeric partner"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00353"
FT BINDING 428..429
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00353"
SQ SEQUENCE 537 AA; 58855 MW; 809D0C54D957D362 CRC64;
MRLAYWIYEG TAHHGIGRIA NSLKGVHAVF HAPLGDDYVN VIHTMLERTP NFPRATTSVV
TGRDLAQGTN RLPDTLRQVE ERFKPELIIV SASCSTTLLQ ENLQLIVGNA NIDTEVFIYE
VNPFRVQETE AAEGLFTALV KKYAEKQDLT EEPSINIIGP ASLGFHVRSD VTSLRRMMAT
LGVKINVVAP YSAGLADLKK LPAAWLNVVP YQELGHGAAE HLEEKFGMSS MYDTPLGIQP
TMKWLNELIE KLNAIGAKNG KSSNLKMPPL TAFSFDGMSA PSGVPWFTHS ADMESFSMKR
AFVFGDATRT VAMVKFLRDE LGMEICGAGT YLHKHAAWVR EQLAGYLPDD LIVTEEFQEI
AKRIEADMPD LVCGTQMERH SCRKVDVPCM VTSAPTHIEN HLLGYYPMLG FDGADVIADR
VYTTSKLGLE KHLIDFFGDA GLEYEEEQQE KVAEPALATA GETAGQATEA ATAPATPGAP
LTGEPVWAAD GEAMLKKIPF FVRKKAKLNT ETFAKENGYA TITAEVVRLT KESLGGG
