ID   LUXB_KRYAS              Reviewed;          18 AA.
AC   P18300;
DT   01-NOV-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1990, sequence version 1.
DT   25-MAY-2022, entry version 58.
DE   RecName: Full=Alkanal monooxygenase beta chain;
DE            EC=1.14.14.3 {ECO:0000250|UniProtKB:P19840};
DE   AltName: Full=Bacterial luciferase beta chain;
DE   Flags: Fragment;
GN   Name=luxB;
OS   Kryptophanaron alfredi symbiont.
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Vibrionales; Vibrionaceae.
OX   NCBI_TaxID=28177;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=2256783; DOI=10.1007/bf00245234;
RA   Haygood M.G.;
RT   "Relationship of the luminous bacterial symbiont of the Caribbean
RT   flashlight fish, Kryptophanaron alfredi (family Anomalopidae) to other
RT   luminous bacteria based on bacterial luciferase (luxA) genes.";
RL   Arch. Microbiol. 154:496-503(1990).
CC   -!- FUNCTION: Light-emitting reaction in luminous bacteria. The specific
CC       role of the beta subunit is unknown, but it is absolutely required for
CC       bioluminescence activity. {ECO:0000250|UniProtKB:P19840}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a long-chain fatty aldehyde + FMNH2 + O2 = a long-chain fatty
CC         acid + FMN + 2 H(+) + H2O + hnu; Xref=Rhea:RHEA:17181,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:15379,
CC         ChEBI:CHEBI:17176, ChEBI:CHEBI:30212, ChEBI:CHEBI:57560,
CC         ChEBI:CHEBI:57618, ChEBI:CHEBI:58210; EC=1.14.14.3;
CC         Evidence={ECO:0000250|UniProtKB:P19840};
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta chain.
CC       {ECO:0000250|UniProtKB:P07740}.
CC   -!- SIMILARITY: Belongs to the bacterial luciferase oxidoreductase family.
CC       {ECO:0000305}.
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DR   EMBL; M36597; AAA91214.1; -; Genomic_DNA.
DR   AlphaFoldDB; P18300; -.
DR   GO; GO:0047646; F:alkanal monooxygenase (FMN-linked) activity; IEA:UniProtKB-EC.
DR   GO; GO:0008218; P:bioluminescence; IEA:UniProtKB-KW.
PE   3: Inferred from homology;
KW   Flavoprotein; FMN; Luminescence; Monooxygenase; Oxidoreductase;
KW   Photoprotein.
FT   CHAIN           1..>18
FT                   /note="Alkanal monooxygenase beta chain"
FT                   /id="PRO_0000220173"
FT   NON_TER         18
SQ   SEQUENCE   18 AA;  2153 MW;  8CB3B6955CCB2E7A CRC64;
     MKFGLFFQNF LSENQSSE