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5,6,7,8-tetrahydromethanopterin + oxidized acceptor
7,8-dihydromethanopterin + reduced acceptor
Substrates: -
Products: -
?
7,8-dihydromethanopterin + FMNH2
5,6,7,8-tetrahydromethanopterin + FMN
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
7,8-dihydromethanopterin + reduced dithiothreitol
5,6,7,8-tetrahydromethanopterin + oxidized dithiothreitol
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
additional information
?
-
7,8-dihydromethanopterin + FMNH2
5,6,7,8-tetrahydromethanopterin + FMN
Substrates: -
Products: -
?
7,8-dihydromethanopterin + FMNH2
5,6,7,8-tetrahydromethanopterin + FMN
Substrates: DmrB uses a ping-pong mechanism to transfer reducing equivalents from FMN to the pterin substrate, identification of the 7,8-dihydromethanopterin binding site by computational docking
Products: -
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7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced dithiothreitol
5,6,7,8-tetrahydromethanopterin + oxidized dithiothreitol
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced dithiothreitol
5,6,7,8-tetrahydromethanopterin + oxidized dithiothreitol
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced dithiothreitol
5,6,7,8-tetrahydromethanopterin + oxidized dithiothreitol
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to the enzyme. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. A newly developed assay indicates that dithiothreitol-reduced enzyme can transfer electrons to dihydromethanopterin. Ferredoxin may serve as an electron donor
Products: -
?
7,8-dihydromethanopterin + reduced dithiothreitol
5,6,7,8-tetrahydromethanopterin + oxidized dithiothreitol
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to the enzyme. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. A newly developed assay indicates that dithiothreitol-reduced enzyme can transfer electrons to dihydromethanopterin. Ferredoxin may serve as an electron donor
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
additional information
?
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MJ0208. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MJ0208 can transfer electrons to dihydromethanopterin
Products: -
?
additional information
?
-
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MJ0208. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MJ0208 can transfer electrons to dihydromethanopterin
Products: -
?
additional information
?
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MJ0208. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MJ0208 can transfer electrons to dihydromethanopterin
Products: -
?
additional information
?
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MM1854. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MM1854 can transfer electrons to dihydromethanopterin
Products: -
?
additional information
?
-
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MM1854. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MM1854 can transfer electrons to dihydromethanopterin
Products: -
?
additional information
?
-
Substrates: NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MM1854. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MM1854 can transfer electrons to dihydromethanopterin
Products: -
?
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5,6,7,8-tetrahydromethanopterin + oxidized acceptor
7,8-dihydromethanopterin + reduced acceptor
Substrates: -
Products: -
?
7,8-dihydromethanopterin + FMNH2
5,6,7,8-tetrahydromethanopterin + FMN
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced acceptor
5,6,7,8-tetrahydromethanopterin + oxidized acceptor
Substrates: the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
7,8-dihydromethanopterin + reduced ferredoxin
5,6,7,8-tetrahydromethanopterin + ferredoxin
Substrates: -
Products: -
?
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flavin
iron-sulfur flavoprotein
Ferredoxin
ferredoxin may serve as an electron donor
-
Ferredoxin
ferredoxin may serve as an electron donor
-
FMN
-
FMN
bioinformatic analysis reveals the presence of one FMN-binding site. The purified protein shows an absorbance peaks at 380 and 460 nm, characteristic of oxidized FMN
FMN
the enzyme contains one flavin mononucleotide (FMN)-binding site
FMN
the enzyme contains one flavin mononucleotide (FMN)-binding site
FMN
within a homotrimer, each monomer-monomer interface exhibits an active site with two adjacently bound flavin mononucleotide (FMN) ligands, one deeply buried and tightly bound and one more peripheral. Computational docking suggests that the peripheral site binds either the observed FMN (the electron donor for the overall reaction) or the pterin, H2MPT (the electron acceptor for the overall reaction), in configurations ideal for electron transfer to and from the tightly bound FMN. Analysis of the FMN binding structure in the active site, and kinetics, overview
FMN
DmrB contains 2 FMN molecules on the active site at the monomer-monomer interface. The FMN-1 molecule shows ionic interactions with residues Ser110 and Asn116 along with some non-bonded contacts. The FMN-2 molecule shows ionic contacts with Lys123 and Gln120 and pi-pi stacking with the Tyr85 residue. FMN stabilizes and preserves the secondary and quaternary structure of DmrB against thermal insult
[4Fe-4S]-center
the enzyme contains two iron-sulfur cluster sites
[4Fe-4S]-center
the enzyme contains two iron-sulfur cluster sites
additional information
determination of FMN is the cofactor of DmrB, overview
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additional information
NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MJ0208. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MJ0208 can transfer electrons to dihydromethanopterin
-
additional information
-
NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MJ0208. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MJ0208 can transfer electrons to dihydromethanopterin
-
additional information
NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MM1854. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MM1854 can transfer electrons to dihydromethanopterin
-
additional information
-
NAD(P)H is incapable of directly reducing the flavin cofactor, but dithionite eliminates the FMN peaks, indicating successful electron transfer to MM1854. An electron transfer system of NADPH, spinach NADPH-ferredoxin oxidoreductase, and ferredoxin can also reduce the FMN peaks. Dithiothreitol-reduced MM1854 can transfer electrons to dihydromethanopterin
-
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evolution
sequence comparisons suggested that the catalytic mechanism is conserved among the bacterial homologues of DmrB and partially conserved in archaeal homologues, where an alternate electron donor is likely used
metabolism
the enzyme catalyzes the final step of methanopterin biosynthesis
metabolism
the microbial production of methane by methanogenic archaea is dependent on the synthesis of the pterin-containing cofactor tetrahydromethanopterin (H4MPT). The enzyme catalyzing the last step of H4MPT biosynthesis is dihydromethanopterin reductase
metabolism
the microbial production of methane by methanogenic archaea is dependent on the synthesis of the pterin-containing cofactor tetrahydromethanopterin (H4MPT). The enzyme catalyzing the last step of H4MPT biosynthesis is dihydromethanopterin reductase
metabolism
-
the microbial production of methane by methanogenic archaea is dependent on the synthesis of the pterin-containing cofactor tetrahydromethanopterin (H4MPT). The enzyme catalyzing the last step of H4MPT biosynthesis is dihydromethanopterin reductase
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metabolism
-
the microbial production of methane by methanogenic archaea is dependent on the synthesis of the pterin-containing cofactor tetrahydromethanopterin (H4MPT). The enzyme catalyzing the last step of H4MPT biosynthesis is dihydromethanopterin reductase
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physiological function
the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
physiological function
the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
physiological function
dihydromethanopterin reductase (Dmr) is a redox enzyme that plays a key role in generating tetrahydromethanopterin (H4MPT) for use in one-carbon metabolism. DmrB is a bacterial enzyme that reduces dihydromethanopterin (H2MPT) to H4MPT using flavins as the source of reducing equivalents
physiological function
MJ0208 functions as an archaeal dihydromethanopterin reductase (DmrX) and ferredoxin may serve as an electron donor
physiological function
MM1854 functions as an archaeal dihydromethanopterin reductase (DmrX) and ferredoxin may serve as an electron donor
physiological function
-
the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
-
physiological function
-
MM1854 functions as an archaeal dihydromethanopterin reductase (DmrX) and ferredoxin may serve as an electron donor
-
physiological function
-
the enzyme catalyzes the last step of tetrahydromethanopterin biosynthesis
-
physiological function
-
MJ0208 functions as an archaeal dihydromethanopterin reductase (DmrX) and ferredoxin may serve as an electron donor
-
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Wang, S.; Tiongson, J.; Rasche, M.E.
Discovery and characterization of the first archaeal dihydromethanopterin reductase, an iron-sulfur flavoprotein from Methanosarcina mazei
J. Bacteriol.
196
203-209
2014
Methanocaldococcus jannaschii (Q57661), Methanocaldococcus jannaschii, Methanocaldococcus jannaschii DSM 2661 (Q57661), Methanosarcina mazei (Q8PVV3), Methanosarcina mazei, Methanosarcina mazei DSM 3647 (Q8PVV3)
brenda
Wang, S.; Tiongson, J.; Rasche, M.E.
Discovery and characterization of the first archaeal dihydromethanopterin reductase, an iron-sulfur flavoprotein from Methanosarcina mazei
J. Bacteriol.
196
203-209
2014
Methanocaldococcus jannaschii (Q57661), Methanocaldococcus jannaschii, Methanocaldococcus jannaschii DSM 2661 (Q57661), Methanosarcina mazei (Q8PVV3), Methanosarcina mazei, Methanosarcina mazei DSM 3647 (Q8PVV3)
brenda
McNamara, D.E.; Cascio, D.; Jorda, J.; Bustos, C.; Wang, T.C.; Rasche, M.E.; Yeates, T.O.; Bobik, T.A.
Structure of dihydromethanopterin reductase, a cubic protein cage for redox transfer
J. Biol. Chem.
289
8852-8864
2014
Paraburkholderia xenovorans (Q13QT8)
brenda
Garg, A.; Sinha, S.
Factors deciding the assembly and thermostability of the DmrB cage
Int. J. Biol. Macromol.
182
959-967
2021
Paraburkholderia xenovorans (Q13QT8)
brenda