FNO_METOG
ID FNO_METOG Reviewed; 36 AA.
AC P80951;
DT 01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1997, sequence version 1.
DT 03-AUG-2022, entry version 58.
DE RecName: Full=F420-dependent NADP reductase {ECO:0000303|PubMed:9325428};
DE EC=1.5.1.40 {ECO:0000269|PubMed:9325428};
DE AltName: Full=F420H2:NADP oxidoreductase;
DE Flags: Fragment;
GN Name=fno;
OS Methanogenium organophilum.
OC Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia;
OC Methanomicrobiales; Methanomicrobiaceae; Methanogenium.
OX NCBI_TaxID=2199;
RN [1]
RP PROTEIN SEQUENCE, FUNCTION, CATALYTIC ACTIVITY, BIOPHYSICOCHEMICAL
RP PROPERTIES, AND SUBUNIT.
RC STRAIN=ATCC BAA-914 / DSM 3596 / OCM 72;
RX PubMed=9325428; DOI=10.1007/s002030050514;
RA Berk H., Thauer R.K.;
RT "Function of coenzyme F420-dependent NADP reductase in methanogenic archaea
RT containing an NADP-dependent alcohol dehydrogenase.";
RL Arch. Microbiol. 168:396-402(1997).
CC -!- FUNCTION: Catalyzes the reduction of NADP(+) with F420H(2) via hydride
CC transfer, and the reverse reaction, i.e. the reduction of F420 with
CC NADPH. In M.organophilum, an alcohol-fermenting methanogen containing
CC an NADP-dependent alcohol dehydrogenase, is probably involved in the
CC regeneration of F420H(2) required for CO(2) reduction to methane. Thus,
CC during growth on alcohol and CO(2), the F420-dependent NADP reductase
CC probably has the function of coupling the NADP-dependent oxidation of
CC the alcohol to the aldehyde with the F420-dependent reduction of CO(2)
CC to methane. {ECO:0000269|PubMed:9325428}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=NADP(+) + reduced coenzyme F420-(gamma-L-Glu)(n) = 2 H(+) +
CC NADPH + oxidized coenzyme F420-(gamma-L-Glu)(n);
CC Xref=Rhea:RHEA:31363, Rhea:RHEA-COMP:12939, Rhea:RHEA-COMP:14378,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349,
CC ChEBI:CHEBI:133980, ChEBI:CHEBI:139511; EC=1.5.1.40;
CC Evidence={ECO:0000269|PubMed:9325428};
CC -!- BIOPHYSICOCHEMICAL PROPERTIES:
CC Kinetic parameters:
CC KM=0.1 mM for F420 (at pH 6.0) {ECO:0000269|PubMed:9325428};
CC KM=0.05 mM for NADPH (at pH 6.0) {ECO:0000269|PubMed:9325428};
CC KM=0.04 mM for F420H(2) (at pH 8.0) {ECO:0000269|PubMed:9325428};
CC KM=0.01 mM for NADP(+) (at pH 8.0) {ECO:0000269|PubMed:9325428};
CC Vmax=2800 umol/min/mg enzyme for F420 reduction with NADPH
CC {ECO:0000269|PubMed:9325428};
CC Vmax=2000 umol/min/mg enzyme for NADP(+) reduction with F420H(2)
CC {ECO:0000269|PubMed:9325428};
CC pH dependence:
CC Optimum pH is 5.5 for F420 reduction with NADPH, and 9.2 for NADP(+)
CC reduction with F420H(2). {ECO:0000269|PubMed:9325428};
CC Temperature dependence:
CC Optimum temperature is 34 degrees Celsius.
CC {ECO:0000269|PubMed:9325428};
CC -!- SUBUNIT: Homotetramer. {ECO:0000305|PubMed:9325428}.
CC -!- SIMILARITY: Belongs to the F420-dependent NADP reductase family.
CC {ECO:0000305}.
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DR BRENDA; 1.5.1.40; 13505.
DR GO; GO:0102261; F:8-hydroxy-5-deazaflavin:NADPH oxidoreductase activity; IEA:UniProtKB-EC.
DR GO; GO:0052808; F:reduced coenzyme F420:NADP+ oxidoreductase activity; IEA:UniProtKB-EC.
DR InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR SUPFAM; SSF51735; SSF51735; 1.
PE 1: Evidence at protein level;
KW Direct protein sequencing; NADP; Oxidoreductase.
FT CHAIN 1..>36
FT /note="F420-dependent NADP reductase"
FT /id="PRO_0000087153"
FT BINDING 9..12
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000250|UniProtKB:O29370"
FT UNSURE 32..36
FT NON_TER 36
SQ SEQUENCE 36 AA; 3775 MW; 91A52A1B3EACE7D3 CRC64;
MKVGIMGGTG NIGEGLARRI XIGGKYDVMI KGRDKA
