ID   DUS_RICCN               Reviewed;         331 AA.
AC   Q92JQ6;
DT   28-NOV-2003, integrated into UniProtKB/Swiss-Prot.
DT   20-MAR-2007, sequence version 2.
DT   03-AUG-2022, entry version 96.
DE   RecName: Full=Probable tRNA-dihydrouridine synthase;
DE            EC=1.3.1.-;
GN   Name=dus; OrderedLocusNames=RC0011;
OS   Rickettsia conorii (strain ATCC VR-613 / Malish 7).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rickettsiales;
OC   Rickettsiaceae; Rickettsieae; Rickettsia; spotted fever group.
OX   NCBI_TaxID=272944;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC VR-613 / Malish 7;
RX   PubMed=11557893; DOI=10.1126/science.1061471;
RA   Ogata H., Audic S., Renesto-Audiffren P., Fournier P.-E., Barbe V.,
RA   Samson D., Roux V., Cossart P., Weissenbach J., Claverie J.-M., Raoult D.;
RT   "Mechanisms of evolution in Rickettsia conorii and R. prowazekii.";
RL   Science 293:2093-2098(2001).
CC   -!- FUNCTION: Catalyzes the synthesis of 5,6-dihydrouridine (D), a modified
CC       base found in the D-loop of most tRNAs, via the reduction of the C5-C6
CC       double bond in target uridines. {ECO:0000250|UniProtKB:P33371}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 5,6-dihydrouridine in tRNA + NAD(+) = a uridine in tRNA +
CC         H(+) + NADH; Xref=Rhea:RHEA:54452, Rhea:RHEA-COMP:13339, Rhea:RHEA-
CC         COMP:13887, ChEBI:CHEBI:15378, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945,
CC         ChEBI:CHEBI:65315, ChEBI:CHEBI:74443;
CC         Evidence={ECO:0000250|UniProtKB:P33371};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 5,6-dihydrouridine in tRNA + NADP(+) = a uridine in tRNA +
CC         H(+) + NADPH; Xref=Rhea:RHEA:23624, Rhea:RHEA-COMP:13339, Rhea:RHEA-
CC         COMP:13887, ChEBI:CHEBI:15378, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349,
CC         ChEBI:CHEBI:65315, ChEBI:CHEBI:74443;
CC         Evidence={ECO:0000250|UniProtKB:P33371};
CC   -!- COFACTOR:
CC       Name=FMN; Xref=ChEBI:CHEBI:58210;
CC         Evidence={ECO:0000250|UniProtKB:P33371};
CC   -!- SIMILARITY: Belongs to the Dus family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAL02549.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AE006914; AAL02549.1; ALT_INIT; Genomic_DNA.
DR   PIR; C97701; C97701.
DR   RefSeq; WP_029374420.1; NC_003103.1.
DR   AlphaFoldDB; Q92JQ6; -.
DR   SMR; Q92JQ6; -.
DR   EnsemblBacteria; AAL02549; AAL02549; RC0011.
DR   KEGG; rco:RC0011; -.
DR   PATRIC; fig|272944.4.peg.11; -.
DR   HOGENOM; CLU_013299_0_1_5; -.
DR   OMA; FRNCVNT; -.
DR   Proteomes; UP000000816; Chromosome.
DR   GO; GO:0050660; F:flavin adenine dinucleotide binding; IEA:InterPro.
DR   GO; GO:0000049; F:tRNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0017150; F:tRNA dihydrouridine synthase activity; IEA:InterPro.
DR   CDD; cd02801; DUS_like_FMN; 1.
DR   Gene3D; 1.10.1200.80; -; 1.
DR   Gene3D; 3.20.20.70; -; 1.
DR   InterPro; IPR013785; Aldolase_TIM.
DR   InterPro; IPR035587; DUS-like_FMN-bd.
DR   InterPro; IPR001269; DUS_fam.
DR   InterPro; IPR024036; tRNA-dHydroUridine_Synthase_C.
DR   InterPro; IPR004652; tRNA_dU_NifR3.
DR   InterPro; IPR018517; tRNA_hU_synthase_CS.
DR   Pfam; PF01207; Dus; 1.
DR   PIRSF; PIRSF006621; Dus; 1.
DR   TIGRFAMs; TIGR00737; nifR3_yhdG; 1.
DR   PROSITE; PS01136; UPF0034; 1.
PE   3: Inferred from homology;
KW   Flavoprotein; FMN; NADP; Oxidoreductase; RNA-binding; tRNA processing;
KW   tRNA-binding.
FT   CHAIN           1..331
FT                   /note="Probable tRNA-dihydrouridine synthase"
FT                   /id="PRO_0000162140"
FT   ACT_SITE        102
FT                   /note="Proton donor"
FT                   /evidence="ECO:0000250|UniProtKB:Q5SMC7"
FT   BINDING         17..19
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250|UniProtKB:P33371"
FT   BINDING         72
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250|UniProtKB:P33371"
FT   BINDING         141
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250|UniProtKB:P33371"
FT   BINDING         202..204
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250|UniProtKB:P33371"
FT   BINDING         226..227
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250|UniProtKB:P33371"
SQ   SEQUENCE   331 AA;  35995 MW;  4B6149340754AB59 CRC64;
     MIKIGNIELS SNIILAPMSG VTDLEFRRLV KRFGAGLVVS EMVASRAMIV ESRQSLKKSA
     IMRDDATSAC VQLAGCEPNV IAEAAKMNEG MGAKIIDLNF GCPAKKVVGG YSGSALMKDE
     QLAAKIFEAT VEAVKLPVTV KMRMGWDDNT KNAPTLAKIA ESSGVQMITV HGRTRCQFYS
     GNADWDFIRS VKESVKIPVI ANGDITNFAK AKEALQKSGA DGIMVGRGAY GKPWLISQID
     HYLKTGEEKS APSIAEQLDI VTEHYEAILD YYGESVGVPI ARKHIGWYSS GLPNSAEFRG
     AVNLMNDPLA VKEKIAEFYT SVMETNKLKE F