ID A0A2T1E736_9CYAN Unreviewed; 508 AA.
AC A0A2T1E736;
DT 18-JUL-2018, integrated into UniProtKB/TrEMBL.
DT 18-JUL-2018, sequence version 1.
DT 24-JAN-2024, entry version 23.
DE RecName: Full=Light-independent protochlorophyllide reductase subunit B {ECO:0000256|HAMAP-Rule:MF_00353};
DE Short=DPOR subunit B {ECO:0000256|HAMAP-Rule:MF_00353};
DE Short=LI-POR subunit B {ECO:0000256|HAMAP-Rule:MF_00353};
DE EC=1.3.7.7 {ECO:0000256|HAMAP-Rule:MF_00353};
GN Name=chlB {ECO:0000256|HAMAP-Rule:MF_00353};
GN ORFNames=C7B82_13005 {ECO:0000313|EMBL:PSB28551.1};
OS Stenomitos frigidus ULC18.
OC Bacteria; Cyanobacteriota; Cyanophyceae; Leptolyngbyales; Leptolyngbyaceae;
OC Stenomitos.
OX NCBI_TaxID=2107698 {ECO:0000313|EMBL:PSB28551.1, ECO:0000313|Proteomes:UP000239576};
RN [1] {ECO:0000313|Proteomes:UP000239576}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ULC18 {ECO:0000313|Proteomes:UP000239576};
RA Moore K., Momper L.;
RL Submitted (FEB-2018) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:PSB28551.1, ECO:0000313|Proteomes:UP000239576}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ULC18 {ECO:0000313|EMBL:PSB28551.1,
RC ECO:0000313|Proteomes:UP000239576};
RA Moore K.R., Magnabosco C., Momper L., Gold D.A., Bosak T., Fournier G.P.;
RT "The ancient ancestry and fast evolution of plastids.";
RL Submitted (MAR-2018) 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 (ChlN-ChlB) is the
CC catalytic component of the complex. {ECO:0000256|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:0000256|HAMAP-Rule:MF_00353};
CC -!- COFACTOR:
CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC Evidence={ECO:0000256|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:0000256|HAMAP-Rule:MF_00353};
CC -!- PATHWAY: Porphyrin-containing compound metabolism; bacteriochlorophyll
CC biosynthesis. {ECO:0000256|ARBA:ARBA00004800}.
CC -!- PATHWAY: Porphyrin-containing compound metabolism; chlorophyll
CC biosynthesis (light-independent). {ECO:0000256|HAMAP-Rule:MF_00353}.
CC -!- SUBUNIT: Protochlorophyllide reductase is composed of three subunits;
CC ChlL, ChlN and ChlB. Forms a heterotetramer of two ChlB and two ChlN
CC subunits. {ECO:0000256|HAMAP-Rule:MF_00353}.
CC -!- SIMILARITY: Belongs to the ChlB/BchB/BchZ family. {ECO:0000256|HAMAP-
CC Rule:MF_00353}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:PSB28551.1}.
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DR EMBL; PVWK01000078; PSB28551.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A2T1E736; -.
DR OrthoDB; 5717231at2; -.
DR UniPathway; UPA00669; -.
DR UniPathway; UPA00670; -.
DR Proteomes; UP000239576; Unassembled WGS sequence.
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:0030494; P:bacteriochlorophyll biosynthetic process; IEA:UniProtKB-UniPathway.
DR GO; GO:0036068; P:light-independent chlorophyll biosynthetic process; IEA:UniProtKB-UniPathway.
DR GO; GO:0019685; P:photosynthesis, dark reaction; IEA:InterPro.
DR CDD; cd01981; Pchlide_reductase_B; 1.
DR Gene3D; 1.20.89.20; -; 1.
DR Gene3D; 3.40.50.1980; Nitrogenase molybdenum iron protein domain; 3.
DR Gene3D; 1.10.8.550; Proto-chlorophyllide reductase 57 kD subunit B; 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 NCBIfam; TIGR01278; DPOR_BchB; 1.
DR PANTHER; PTHR33712; LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B; 1.
DR PANTHER; PTHR33712:SF7; LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B; 1.
DR Pfam; PF00148; Oxidored_nitro; 1.
DR Pfam; PF08369; PCP_red; 1.
DR PIRSF; PIRSF000163; PCP_ChlB; 1.
DR SUPFAM; SSF53807; Helical backbone' metal receptor; 1.
PE 3: Inferred from homology;
KW 4Fe-4S {ECO:0000256|ARBA:ARBA00022485, ECO:0000256|HAMAP-Rule:MF_00353};
KW ATP-binding {ECO:0000256|ARBA:ARBA00022840, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Chlorophyll biosynthesis {ECO:0000256|ARBA:ARBA00023171, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Iron {ECO:0000256|ARBA:ARBA00023004, ECO:0000256|HAMAP-Rule:MF_00353};
KW Iron-sulfur {ECO:0000256|ARBA:ARBA00023014, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Oxidoreductase {ECO:0000256|ARBA:ARBA00023002, ECO:0000256|HAMAP-
KW Rule:MF_00353};
KW Photosynthesis {ECO:0000256|ARBA:ARBA00022531, ECO:0000256|HAMAP-
KW Rule:MF_00353}; Reference proteome {ECO:0000313|Proteomes:UP000239576}.
FT DOMAIN 12..426
FT /note="Nitrogenase/oxidoreductase component 1"
FT /evidence="ECO:0000259|Pfam:PF00148"
FT DOMAIN 459..503
FT /note="Light-independent protochlorophyllide reductase
FT subunit B-like C-terminal"
FT /evidence="ECO:0000259|Pfam:PF08369"
FT ACT_SITE 294
FT /note="Proton donor"
FT /evidence="ECO:0000256|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:0000256|HAMAP-Rule:MF_00353"
FT BINDING 429..430
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00353"
SQ SEQUENCE 508 AA; 56821 MW; BFD5A5703DB2B8FB CRC64;
MKLAYWMYAG PAHIGTLRVA SSFKNVHAIM HAPIGDDYFN VMRSMLERER DFTPVTTSVV
DRNVLARGSQ EKVVDNITRK DAEEHPDLIV LTPTCTSSIL QEDLQNFVER AQIESKGDVM
LADVNHYRVN ELQAADRTLH QIVQFYIEKA RRKGDLPTDK TTKPSVNIFG ISTLGFHNNH
DCTELKRLMA ALGIEVNEVI PEGASVHNIK NLSRAWFNLV PYRELGLMSV QYLEQEFGQP
YVDVTPMGVV ETARCIRKIQ SVINAQGANV DYEAYINEQT LYVSQAAWFS RSIDCQNLTG
KKAVVYGDST HAAAITKVLS REMGIHVVLA GTFCKYDEEW FREQVSEYCD EVLITDDHGA
VGDAIARIEP SAIFGTQMER HVGKRLDIPC GVISAPIHVQ NFPIGYKPFV GYEGTNQLVD
LIYNSFTLGM EDHLLEIFGG HDTKDVITKG ISADSDLAWS KDGQAELNKI PGFVRGKVKR
NTEKFARDRN IEVITAEVLY AAKEAVGA
//
