KpKP13 Protein target profile

Riboflavin biosynthesis bifunctional protein ribD

Accession: KP13_02046

Gene: ribD AHE46049.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GSM9
Length 367
Pocket druggability (P2Rank · AlphaFold DB model) 0.917
Direct ligand evidence 0 57 total records
Functional annotation 0 EC 7 GO
Target summary

Promising target candidate with multiple supporting evidence streams.

Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.

Terms and data sources used on this page

PDB: experimentally determined structures from the Protein Data Bank. These are the strongest structural evidence, but may cover only part of the protein.

AlphaFold DB model: a precomputed predicted structure downloaded from AlphaFold Database/UniProt, not an experiment performed here.

ColabFold model: a predicted structure generated for this workspace; interpret it with coverage and confidence.

pLDDT: confidence score for predicted structures. High values support local geometry; low values mean the region should not drive pocket interpretation.

FPocket / P2Rank: software tools that predict possible ligand-binding pockets on a 3D structure. They are useful screening signals, not experimental validation.

Druggability: a pocket-based estimate of whether a small molecule could bind productively. It does not mean a drug already exists.

PDB ligand: a compound observed in an experimental structure. Direct same-protein records are stronger than homolog-transferred records.

ChEMBL: a public database of measured compound bioactivity. Direct entries are stronger than entries transferred from similar proteins.

ZINC: a purchasable-compound database. Here it marks proposed candidates from chemical similarity, not measured binders.

LigQ / LigQ_2: an internal Target pipeline step that gathers PDB, ChEMBL, and ZINC ligand evidence for each protein.

Off-target: sequence similarity to proteins we prefer not to hit, such as human proteins or beneficial gut microbiome proteins.

DEG: Database of Essential Genes. A match suggests the protein resembles genes known to be essential in other organisms.

Roary / CoreCruncher: pan-genome tools used to decide whether a gene is core across analyzed strains or accessory/strain-specific.

EC / GO: functional annotations: EC describes enzyme reactions; GO describes biological process, molecular function, or cellular component.

KEGG pathway: a curated metabolic route label used here to group reactions imported from the metabolic model.

Chokepoint: a metabolic reaction that is the only producer or consumer of a metabolite in the imported model.

Prioritization evidence

Selectivity, essentiality, structural confidence, conservation, and predicted binding-site evidence.

Off-target risk

Human off-target
No hit
Gut microbiome similarity
3.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
86.921 Higher values support similarity to known essential genes.
DEG E-value
0.0 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
96.74 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

P2Rank's binding-site probability is the primary druggability signal shown across the app; FPocket's druggability score is shown alongside it for comparison. Both estimate small-molecule pocket quality after applying the curated structure priority — neither is experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

Druggability (P2Rank) 0.917
Structure A0A0H3GSM9
Pocket Pocket 1
Druggability (FPocket) 0.39
Structure A0A0H3GSM9
Pocket Pocket 22
ColabFold model
P2Rank 0.92 · Pocket 1
FPocket 0.822 · Pocket 26
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 172 / 4744 genomes with a hit
Prevalence 3.6%

Sequence

Primary amino-acid sequence viewer.

MQDEMYMARALKLAARGRFTTHPNPNVGCVIVKDGEIVGEGFHYRAGEPHAEVHALRMAGEKARGATAYVTLEPCSHHGRTPPCCDALIAAGVSRVVAAMQDPNPQVAGRGLYRLQQAGIEVSHGLMMNEAEALNKGFLKRMRTGFPWVQLKLGASLDGRTAMASGESQWITSPQARRDVQRLRAQSHAILTSSATVLADDPALTVRWQELSADTQALYPEENLRQPLRVVIDSQNRVTPEHRIVQQAGETLFARLRADERQWPESARTLLVPEHNGHLDLVLLMMLLGKQQINSVWVEAGATLAGALLQAGLVDELIVYIAPKLLGNAARGLCALPGLEELSQAPHFKFNEIRQVGPDVCLHLTTA

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

7 GO

Subcellular localization

Localization
Cytoplasmic

Gene Ontology (GO)

7
  • GO:0008270 Binding to a zinc ion (Zn).
  • GO:0008835 Catalysis of the reaction: 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + H2O + H+ = 5-amino-6-(5-phosphoribosylamino)uracil + NH4.
  • GO:0016787 Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc.
  • GO:0009231 The chemical reactions and pathways resulting in the formation of riboflavin (vitamin B2), the precursor for the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD).
  • GO:0008703 Catalysis of the reaction: 5-amino-6-(5-phosphoribitylamino)uracil + NADP+ = 5-amino-6-(5-phosphoribosylamino)uracil + H+ + NADPH.
  • GO:0003824 Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.
  • GO:0050661 Binding to nicotinamide-adenine dinucleotide phosphate, a coenzyme involved in many redox and biosynthetic reactions; binding may be to either the oxidized form, NADP+, or the reduced form, NADPH.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

25 records
Show feature table
Start End DB Term Name
144 362 SUPERFAMILY SSF53597 Dihydrofolate reductase-like
144 362 InterPro IPR024072 Dihydrofolate reductase-like domain superfamily
1 140 Gene3D G3DSA:3.40.140.10 Cytidine Deaminase, domain 2
146 365 NCBIfam TIGR00227 riboflavin-specific deaminase C-terminal domain
146 365 InterPro IPR011549 Riboflavin-specific deaminase, C-terminal
50 88 ProSitePatterns PS00903 Cytidine and deoxycytidylate deaminases zinc-binding region signature.
50 88 InterPro IPR016192 APOBEC/CMP deaminase, zinc-binding
141 363 PANTHER PTHR38011 DIHYDROFOLATE REDUCTASE FAMILY PROTEIN (AFU_ORTHOLOGUE AFUA_8G06820)
141 367 Gene3D G3DSA:3.40.430.10 Dihydrofolate Reductase, subunit A
141 367 InterPro IPR024072 Dihydrofolate reductase-like domain superfamily
141 366 FunFam G3DSA:3.40.430.10:FF:000006 Riboflavin biosynthesis protein RibD
1 367 PIRSF PIRSF006769 RibD
1 367 InterPro IPR004794 Riboflavin biosynthesis protein RibD
147 362 Pfam PF01872 RibD C-terminal domain
147 362 InterPro IPR002734 Bacterial bifunctional deaminase-reductase, C-terminal
1 140 FunFam G3DSA:3.40.140.10:FF:000025 Riboflavin biosynthesis protein RibD
7 362 NCBIfam TIGR00326 bifunctional diaminohydroxyphosphoribosylaminopyrimidine deaminase/5-amino-6-(5-phosphoribosylamino)uracil reductase RibD
7 362 InterPro IPR004794 Riboflavin biosynthesis protein RibD
2 99 Pfam PF00383 Cytidine and deoxycytidylate deaminase zinc-binding region
2 99 InterPro IPR002125 Cytidine and deoxycytidylate deaminase domain
3 145 SUPERFAMILY SSF53927 Cytidine deaminase-like
3 145 InterPro IPR016193 Cytidine deaminase-like
1 123 ProSiteProfiles PS51747 Cytidine and deoxycytidylate deaminases domain profile.
1 123 InterPro IPR002125 Cytidine and deoxycytidylate deaminase domain
7 119 CDD cd01284 Riboflavin_deaminase-reductase

3D structure

Selected loaded structure. Experimental PDB entries may cover only a portion of the sequence; AlphaFold DB and ColabFold models typically cover the full protein but remain computational predictions.

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Pocket score High Medium Low
How colors and pocket overlays are used
Uniform protein color marks the displayed model as a single molecular object.
Experimental PDB structures may be colored by chain to distinguish subunits or copies present in the file.
Pocket colors and alpha spheres are evidence overlays for predicted binding cavities; they are not alternative protein chains.
'Alpha spheres' is FPocket's own cavity-shape geometry, imported when available and aligned with the loaded structure.
'Pocket atoms'/'Predicted site atoms' show the pocket's residue atoms instead: P2Rank reports residues rather than alpha spheres, and FPocket falls back to this when alpha-sphere geometry is unavailable or doesn't align.
'No pocket geometry' means neither alpha spheres nor residue-position data could be found for that pocket; the layer just highlights the same residues as 'Nearby residues'.
Pocket details Inspect a specific pocket, or open the full viewer

Binding pockets · P2Rank

Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Pocket 1 P2Rank #1
0.917
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Surrounding area
Pocket 2 P2Rank #2
0.879
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Surrounding area
Pocket 3 P2Rank #3
0.672
Show in viewer
Surrounding area
Pocket 4 P2Rank #4
0.172
Likely same site as FPocket 22 0.7 Å 12 shared residues 100% of smaller site
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Surrounding area
Pocket 5 P2Rank #5
0.062
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Surrounding area

Binding pockets · FPocket

Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4

Pocket 1 FPocket #22
0.39
Likely same site as P2Rank 4 0.7 Å 12 shared residues 100% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Active site:52-52 Proton donor
UniProt: Binding site:154-154
UniProt: Binding site:168-168
UniProt: Binding site:170-170
UniProt: Binding site:184-184
UniProt: Binding site:196-196
UniProt: Binding site:200-200
UniProt: Binding site:204-204
UniProt: Binding site:207-207
UniProt: Binding site:234-234
UniProt: Binding site:299-299
UniProt: Binding site:301-307
UniProt: Binding site:50-50
UniProt: Binding site:75-75
UniProt: Binding site:84-84
All structural evidence 0 experimental · 2 predicted

Structural evidence

0 + 2

Experimental PDB entries plus predicted AlphaFold DB or ColabFold models. Click Switch to display a different loaded structure in the viewer.

Entry Method Resolution Chain Coverage Links Status
AlphaFold DB AF_A0A0H3GSM9
AlphaFold DB full sequence Viewing
ColabFold KP13_02046
ColabFold full sequence Loaded

Ligand evidence

Ligands grouped by evidence source. PDB ligands keep the source crystal visible, and loaded crystals can be opened directly in the structure viewer.

57 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 7 records from similar proteins
Structural ligands 7 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
5GP PDB via homolog 363.2 Da · LogP -2.57 · TPSA 206.0 Open detail RCSB PDB
AI9 PDB via homolog Detail RCSB PDB
AIF PDB via homolog Detail RCSB PDB
AOF PDB via homolog Detail RCSB PDB
CAC PDB via homolog Detail RCSB PDB

Structural evidence inferred from similar proteins. The source crystal indicates where the ligand was observed; the UniProt column identifies the homologous protein carrying that ligand.

Show only:
Ligand Source crystal UniProt (homolog) MW · LogP · TPSA Lipinski PAINS SMILES
5GP RCSB PDB D0CB74 363.2 Da LogP -2.57 TPSA 206.0 1 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O…
AI9 RCSB PDB P17618 354.2 Da LogP -3.46 TPSA 231.5 1 viol. ✓ Clean C([C@H]([C@H]([C@H](/C=N/C1=C(C(=O)NC(=O)N1)N)O…
AIF RCSB PDB P17618 354.2 Da LogP -3.46 TPSA 231.5 1 viol. ✓ Clean C([C@H]([C@H]([C@@H](\C=N\C1=C(C(=O)NC(=O)N1)N)…
AOF RCSB PDB P17618 354.2 Da LogP -3.39 TPSA 220.2 1 viol. ✓ Clean C([C@@H]1[C@H]([C@H]([C@@H](O1)NC2=C(C(=O)NC(=O…
CAC RCSB PDB D0CB74 137.0 Da LogP -0.52 TPSA 40.1 ✓ Ro5 ✓ Clean C[As](=O)(C)[O-]
MA5 RCSB PDB Q58085 452.5 Da LogP -2.40 TPSA 178.5 2 viol. ✓ Clean C1CCC(CC1)CCO[C@H]2[C@@H]([C@H]([C@@H]([C@H](O2…
OXL RCSB PDB D0CB74 88.0 Da LogP -3.51 TPSA 80.3 ✓ Ro5 ✓ Clean C(=O)(C(=O)[O-])[O-]

PDB and ChEMBL records on this protein are shown in full. ChEMBL records from similar proteins are capped at the top 100 per protein (by pchembl) and ZINC at the top 50 (Tanimoto ≥ 0.5). ADME columns are descriptor-based screening flags, not experimental toxicity results.

Cross-references

External database identifiers for this protein, its structures, ligands, and metabolic reactions.