bifunctional 3,4-dihydroxy-2-butanone-4-phosphate synthase/GTP cyclohydrolase II catalyzes the conversion of D-ribulose 5-phosphate to formate and 3,4-dihydroxy-2-butanone 4-phosphate, as well as the conversion of GTP to 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate (DARP), formate and pyrophosphate
3,4-dihydroxy-2-butanone 4-phosphate synthase; 3,4-Dihydroxy-2-butanone 4-phosphate is ...
8-201
4.27e-121
3,4-dihydroxy-2-butanone 4-phosphate synthase; 3,4-Dihydroxy-2-butanone 4-phosphate is biosynthesized from ribulose 5-phosphate and serves as the biosynthetic precursor for the xylene ring of riboflavin. Sometimes found as a bifunctional enzyme with pfam00925.
Pssm-ID: 460001 Cd Length: 192 Bit Score: 349.75 E-value: 4.27e-121
GTP cyclohydrolase II (RibA). GTP cyclohydrolase II catalyzes the conversion of GTP to 2, ...
208-405
1.29e-113
GTP cyclohydrolase II (RibA). GTP cyclohydrolase II catalyzes the conversion of GTP to 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5' phosphate, formate, pyrophosphate (APy), and GMP in the biosynthetic pathway of riboflavin. Riboflavin is the precursor molecule for the synthesis of the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) which are essential to cell metabolism. The enzyme is present in plants and numerous pathogenic bacteria, especially gram negative organisms, who are dependent on endogenous synthesis of the vitamin because they lack an appropriate uptake system. For animals and humans, which lack this biosynthetic pathway, riboflavin is the essential vitamin B2. GTP cyclohydrolase II requires magnesium ions for activity and has a bound catalytic zinc. The functionally active form is thought to be a homodimer. A paralogous protein is encoded in the genome of Streptomyces coelicolor, which converts GTP to 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate (FAPy), an activity that has otherwise been reported for unrelated GTP cyclohydrolases III.
Pssm-ID: 238348 [Multi-domain] Cd Length: 193 Bit Score: 330.62 E-value: 1.29e-113
GTP cyclohydrolase II; Several members of the family are bifunctional, involving both ribA and ...
210-403
8.91e-86
GTP cyclohydrolase II; Several members of the family are bifunctional, involving both ribA and ribB function. In these cases, ribA tends to be on the C-terminal end of the protein and ribB tends to be on the N-terminal. The function of archaeal members of the family has not been demonstrated and is assigned tentatively. [Biosynthesis of cofactors, prosthetic groups, and carriers, Riboflavin, FMN, and FAD]
Pssm-ID: 129596 [Multi-domain] Cd Length: 191 Bit Score: 259.71 E-value: 8.91e-86
3,4-dihydroxy-2-butanone 4-phosphate synthase [Coenzyme transport and metabolism]; 3, ...
2-204
8.76e-123
3,4-dihydroxy-2-butanone 4-phosphate synthase [Coenzyme transport and metabolism]; 3,4-dihydroxy-2-butanone 4-phosphate synthase is part of the Pathway/BioSystem: Riboflavin/FAD biosynthesis
Pssm-ID: 439878 Cd Length: 201 Bit Score: 354.33 E-value: 8.76e-123
3,4-dihydroxy-2-butanone 4-phosphate synthase; 3,4-Dihydroxy-2-butanone 4-phosphate is ...
8-201
4.27e-121
3,4-dihydroxy-2-butanone 4-phosphate synthase; 3,4-Dihydroxy-2-butanone 4-phosphate is biosynthesized from ribulose 5-phosphate and serves as the biosynthetic precursor for the xylene ring of riboflavin. Sometimes found as a bifunctional enzyme with pfam00925.
Pssm-ID: 460001 Cd Length: 192 Bit Score: 349.75 E-value: 4.27e-121
GTP cyclohydrolase II (RibA). GTP cyclohydrolase II catalyzes the conversion of GTP to 2, ...
208-405
1.29e-113
GTP cyclohydrolase II (RibA). GTP cyclohydrolase II catalyzes the conversion of GTP to 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5' phosphate, formate, pyrophosphate (APy), and GMP in the biosynthetic pathway of riboflavin. Riboflavin is the precursor molecule for the synthesis of the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD) which are essential to cell metabolism. The enzyme is present in plants and numerous pathogenic bacteria, especially gram negative organisms, who are dependent on endogenous synthesis of the vitamin because they lack an appropriate uptake system. For animals and humans, which lack this biosynthetic pathway, riboflavin is the essential vitamin B2. GTP cyclohydrolase II requires magnesium ions for activity and has a bound catalytic zinc. The functionally active form is thought to be a homodimer. A paralogous protein is encoded in the genome of Streptomyces coelicolor, which converts GTP to 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate (FAPy), an activity that has otherwise been reported for unrelated GTP cyclohydrolases III.
Pssm-ID: 238348 [Multi-domain] Cd Length: 193 Bit Score: 330.62 E-value: 1.29e-113
GTP cyclohydrolase II; Several members of the family are bifunctional, involving both ribA and ...
210-403
8.91e-86
GTP cyclohydrolase II; Several members of the family are bifunctional, involving both ribA and ribB function. In these cases, ribA tends to be on the C-terminal end of the protein and ribB tends to be on the N-terminal. The function of archaeal members of the family has not been demonstrated and is assigned tentatively. [Biosynthesis of cofactors, prosthetic groups, and carriers, Riboflavin, FMN, and FAD]
Pssm-ID: 129596 [Multi-domain] Cd Length: 191 Bit Score: 259.71 E-value: 8.91e-86
3,4-dihydroxy-2-butanone 4-phosphate synthase; Several members of the family are bifunctional, ...
4-202
4.70e-84
3,4-dihydroxy-2-butanone 4-phosphate synthase; Several members of the family are bifunctional, involving both ribA and ribB function. In these cases, ribA tends to be on the C-terminal end of the protein and ribB tends to be on the N-terminal. [Biosynthesis of cofactors, prosthetic groups, and carriers, Riboflavin, FMN, and FAD]
Pssm-ID: 273108 Cd Length: 199 Bit Score: 255.77 E-value: 4.70e-84
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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Functional characterization of the conserved domain architecture found on the query.
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This image shows a graphical summary of conserved domains identified on the query sequence.
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if a domain or superfamily has been annotated with functional sites (conserved features),
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click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
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To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
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Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
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specific hits meet or exceed a domain-specific e-value threshold
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and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
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multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
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