Strong target candidate with converging metabolic, structural and chemical evidence.
Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.
Main supporting evidence
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
- 9.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.
Essentiality
- Essential (DEG)
- N
- DEG identity (%)
- 0.0 Higher values support similarity to known essential genes.
Localization
- Localization
- Cytoplasmic
Structure confidence
- ColabFold pLDDT
- 97.96 0-100 confidence; >70 supports local structural interpretation.
Binding-site evidence
PDB experimental structureThe selected pocket score is the FPocket value used for ranking after applying the curated structure priority. It estimates small-molecule pocket quality; it is not experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.
Cross-references
External database identifiers for this protein, its structures, ligands, and metabolic reactions.
Sequence
Structure
Sequence
Primary amino-acid sequence viewer.
MIPFNAPPVVGTELDYMQSAMNSGKLCGDGGFTRRCQQWMEQRFGTAKALLTPSCTASLEMAALLLDIQPGDEVIMPSYTFVSTANAFVLRGAKIVFVDIRRDTMNIDETLIEAAITDKTRAIVPVHYAGVACEMDTIMAIADKYNLFVVEDAAQGVMSTYKGRALGTIGHIGCFSFHETKNYTAGGEGGATLINDRTLVERAEIIREKGTNRSQFFRGLVDKYTWRDIGSSYLMSDLQAAYLWAQLEAAERINQQRLALWQNYYDALLPLARAGRIELPTVPADCGQNAHMFYIKLRDIEDRSRLIAWLKEAEILAVFHYIPLHSCPAGEQFGEFRGEDRYTTQESERLVRLPLFYNLSVVNQRTVINSLLSYFS
Functional annotations
Enzyme classification and Gene Ontology terms linked to this protein.
Gene Ontology (GO)
3- GO:0009246 The chemical reactions and pathways resulting in the formation of the enterobacterial common antigen, an acidic polysaccharide containing N-acetyl-D-glucosamine, N-acetyl-D-mannosaminouronic acid, and 4-acetamido-4,6-dideoxy-D-galactose. A major component of the cell wall outer membrane of Gram-negative bacteria.
- 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:0019180 Catalysis of the reaction: dTDP-4-amino-4,6-dideoxy-alpha-D-galactose + 2-oxoglutarate = dTDP-4-dehydro-6-deoxy-alpha-D-glucose + L-glutamate.
Sequence domains and features
Domain and signature matches imported from InterPro and related databases.
Show feature table
| Start | End | DB | Term | Name |
|---|---|---|---|---|
| 250 | 376 | Gene3D | G3DSA:3.90.1150.10 | Aspartate Aminotransferase, domain 1 |
| 250 | 376 | InterPro | IPR015422 | Pyridoxal phosphate-dependent transferase, small domain |
| 1 | 249 | Gene3D | G3DSA:3.40.640.10 | - |
| 1 | 249 | InterPro | IPR015421 | Pyridoxal phosphate-dependent transferase, major domain |
| 1 | 249 | FunFam | G3DSA:3.40.640.10:FF:000037 | dTDP-4-amino-4,6-dideoxygalactose transaminase |
| 1 | 371 | PANTHER | PTHR30244 | TRANSAMINASE |
| 1 | 371 | InterPro | IPR000653 | DegT/DnrJ/EryC1/StrS aminotransferase |
| 250 | 376 | FunFam | G3DSA:3.90.1150.10:FF:000061 | dTDP-4-amino-4,6-dideoxygalactose transaminase |
| 13 | 371 | CDD | cd00616 | AHBA_syn |
| 13 | 371 | InterPro | IPR000653 | DegT/DnrJ/EryC1/StrS aminotransferase |
| 13 | 371 | Pfam | PF01041 | DegT/DnrJ/EryC1/StrS aminotransferase family |
| 2 | 375 | SUPERFAMILY | SSF53383 | PLP-dependent transferases |
| 2 | 375 | InterPro | IPR015424 | Pyridoxal phosphate-dependent transferase |
| 1 | 376 | PIRSF | PIRSF000390 | PLP_StrS |
| 1 | 376 | InterPro | IPR000653 | DegT/DnrJ/EryC1/StrS aminotransferase |
| 1 | 376 | NCBIfam | TIGR02379 | dTDP-4-amino-4,6-dideoxy-D-glucose transaminase |
| 1 | 376 | InterPro | IPR012749 | dTDP-4-amino-4,6-dideoxygalactose transaminase WecE-like |
| 1 | 376 | Hamap | MF_02026 | dTDP-4-amino-4,6-dideoxygalactose transaminase [wecE]. |
| 1 | 376 | InterPro | IPR032894 | dTDP-4-amino-4,6-dideoxygalactose transaminase WecE |
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.
How colors and pocket overlays are used
Pocket details Inspect a specific pocket, or open the full viewer
- Method
- -
- Score
- -
- Visible layer
- -
- Residues
- -
- Pocket properties
- -
Selecting a pocket opens its details and centers the viewer without clearing other active layers. Use Focus this pocket when you want to hide the rest; use Surface for the wider residue environment.
Binding pockets · FPocket
Druggability: high ≥ 0.7 · medium 0.4–0.69 · low < 0.4
Binding pockets · P2Rank
Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2
Binding pockets · FPocket
Druggability: high ≥ 0.7 · medium 0.4–0.69 · low < 0.4
Binding pockets · P2Rank
Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2
All structural evidence
Structural evidence
1 + 1Experimental PDB entries plus predicted AlphaFold DB or ColabFold models. Click Switch to display a different loaded structure in the viewer.
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.
Structural ligand evidence is available for this target.
Highest-confidence structural evidence: ligands co-crystallized with this exact protein. If the source PDB is loaded in Target, use Open crystal to inspect it in the structure viewer.
No PDB structure with a co-crystallized ligand found for this exact protein.
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.
| Ligand | Source crystal | UniProt (homolog) | MW · LogP · TPSA | Lipinski | PAINS | SMILES |
|---|---|---|---|---|---|---|
| AKG RCSB PDB | Q8ZNF3 | 146.1 Da LogP -0.50 TPSA 91.7 | ✓ Ro5 | ✓ Clean |
C(CC(=O)O)C(=O)C(=O)O
|
|
| DCS RCSB PDB | Q8ZNF3 | 333.2 Da LogP -0.78 TPSA 150.2 | ✓ Ro5 | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN[C@@H]2CONC2=O)O
|
|
| G4M RCSB PDB | Q9A9H3 | 819.5 Da LogP -2.79 TPSA 403.2 | 3 viol. | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN[C@@H]2[C@H](O[C@@H]…
|
|
| GPD RCSB PDB | Q9A9H3 | 572.4 Da LogP -2.61 TPSA 297.0 | 3 viol. | ✓ Clean |
C[C@@H]1[C@H](C[C@@H]([C@H](O1)O[P@](=O)(O)O[P@…
|
|
| PGU RCSB PDB | Q9ZGH4 | 378.3 Da LogP 0.11 TPSA 186.5 | 1 viol. | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN[C@@H](CCC(=O)O)C(=O…
|
|
| PMP RCSB PDB | Q8ZNF3 | 248.2 Da LogP 0.16 TPSA 125.9 | ✓ Ro5 | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN)O
|
|
| T5K RCSB PDB | P27833 | 776.5 Da LogP -1.28 TPSA 348.5 | 3 viol. | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)/C=N/[C@H]2[C@H](O[C@@…
|
|
| TQP RCSB PDB | Q6TFC4 | 776.5 Da LogP -1.28 TPSA 348.5 | 3 viol. | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)\C=N\[C@H]2[C@@H]([C@H…
|
Experimental bioactivity from ChEMBL measured directly on this protein. Score = pchembl (−log Ki/IC₅₀; higher = more potent).
No ChEMBL bioactivity data found for this exact protein.
Bioactivity inferred from similar proteins in ChEMBL. Score = pchembl (−log Ki/IC₅₀; higher = more potent).
No ChEMBL hits found through similar proteins.
Proposed virtual-screening candidates from ZINC. Score = Tanimoto similarity to a known binder (0–1; higher = more similar).
| Ligand | Tanimoto | MW · LogP · TPSA | Lipinski | PAINS | SMILES |
|---|---|---|---|---|---|
| ZINC2018106 ZINC | 0.700 | 206.2 Da LogP -0.86 TPSA 132.1 | ✓ Ro5 | ✓ Clean |
O=C(O)CC[C@](O)(CC(=O)O)C(=O)O
|
| ZINC12501413 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](COP(=O)(O)O)[C@@H](O)…
|
| ZINC12958448 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](COP(=O)(O)O)[C@H](O)[…
|
| ZINC1532555 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](COP(=O)(O)O)[C@H](O)[…
|
| ZINC16546189 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](COP(=O)(O)O)[C@H](O)[…
|
| ZINC2159505 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](COP(=O)(O)O)[C@@H](O)…
|
| ZINC3073318 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](COP(=O)(O)O)[C@@H](O)…
|
| ZINC3869963 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](COP(=O)(O)O)[C@@H](O)…
|
| ZINC3869965 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@@H](COP(=O)(O)O)[C@@H](O…
|
| ZINC9334496 ZINC | 0.662 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](COP(=O)(O)O)[C@H](O)[…
|
| ZINC3593496 ZINC | 0.652 | 206.2 Da LogP -1.16 TPSA 121.1 | ✓ Ro5 | ✓ Clean |
COC(=O)C[C@@](O)(CC(=O)O)C(=O)O
|
| ZINC3593497 ZINC | 0.652 | 206.2 Da LogP -1.16 TPSA 121.1 | ✓ Ro5 | ✓ Clean |
COC(=O)C[C@](O)(CC(=O)O)C(=O)O
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| ZINC71774763 ZINC | 0.628 | 432.3 Da LogP -2.23 TPSA 198.3 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](CO[P@](=O)(O)N3CCOCC3…
|
| ZINC14686440 ZINC | 0.625 | 436.4 Da LogP -2.64 TPSA 247.9 | 1 viol. | ✓ Clean |
O=C(O)C[C@](O)(CC(=O)NCCCCNC(=O)C[C@@](O)(CC(=O…
|
| ZINC14686442 ZINC | 0.625 | 436.4 Da LogP -2.64 TPSA 247.9 | 1 viol. | ✓ Clean |
O=C(O)C[C@@](O)(CC(=O)NCCCCNC(=O)C[C@](O)(CC(=O…
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| ZINC14686444 ZINC | 0.625 | 436.4 Da LogP -2.64 TPSA 247.9 | 1 viol. | ✓ Clean |
O=C(O)C[C@@](O)(CC(=O)NCCCCNC(=O)C[C@@](O)(CC(=…
|
| ZINC4743771 ZINC | 0.608 | 361.3 Da LogP -2.70 TPSA 182.6 | 1 viol. | ✓ Clean |
CS(=O)(=O)OC[C@H]1O[C@@H](n2cnc3c(=O)[nH]c(N)nc…
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| ZINC4743772 ZINC | 0.608 | 361.3 Da LogP -2.70 TPSA 182.6 | 1 viol. | ✓ Clean |
CS(=O)(=O)OC[C@@H]1O[C@@H](n2cnc3c(=O)[nH]c(N)n…
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| ZINC4743774 ZINC | 0.608 | 361.3 Da LogP -2.70 TPSA 182.6 | 1 viol. | ✓ Clean |
CS(=O)(=O)OC[C@H]1O[C@@H](n2cnc3c(=O)[nH]c(N)nc…
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| ZINC4743775 ZINC | 0.608 | 361.3 Da LogP -2.70 TPSA 182.6 | 1 viol. | ✓ Clean |
CS(=O)(=O)OC[C@@H]1O[C@@H](n2cnc3c(=O)[nH]c(N)n…
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| ZINC13398039 ZINC | 0.577 | 234.2 Da LogP -0.38 TPSA 121.1 | ✓ Ro5 | ✓ Clean |
CC(C)OC(=O)C[C@](O)(CC(=O)O)C(=O)O
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| ZINC2528012 ZINC | 0.577 | 234.2 Da LogP -0.38 TPSA 121.1 | ✓ Ro5 | ✓ Clean |
CC(C)OC(=O)C[C@@](O)(CC(=O)O)C(=O)O
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| ZINC146315135 ZINC | 0.560 | 204.2 Da LogP 0.86 TPSA 94.8 | ✓ Ro5 | ✓ Clean |
CCCCC[C@@](O)(CC(=O)O)C(=O)O
|
| ZINC146315336 ZINC | 0.560 | 204.2 Da LogP 0.86 TPSA 94.8 | ✓ Ro5 | ✓ Clean |
CCCCC[C@](O)(CC(=O)O)C(=O)O
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| ZINC12503440 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](CO)[C@@H](OP(=O)(O)O)…
|
| ZINC1530370 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](CO)[C@H](OP(=O)(O)O)[…
|
| ZINC28631009 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](CO)[C@H](OP(=O)(O)O)[…
|
| ZINC3872740 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](CO)[C@@H](OP(=O)(O)O)…
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| ZINC3872741 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@@H](CO)[C@@H](OP(=O)(O)O…
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| ZINC3872742 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](CO)[C@@H](OP(=O)(O)O)…
|
| ZINC3872743 ZINC | 0.558 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@@H](CO)[C@@H](OP(=O)(O)O…
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| ZINC1850353 ZINC | 0.556 | 206.1 Da LogP -0.86 TPSA 132.1 | ✓ Ro5 | ✓ Clean |
O=C(O)CC(O)(CC(=O)O)CC(=O)O
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| ZINC4743778 ZINC | 0.556 | 437.4 Da LogP -0.97 TPSA 182.6 | 1 viol. | ✓ Clean |
Cc1ccc(S(=O)(=O)OC[C@H]2O[C@@H](n3cnc4c(=O)[nH]…
|
| ZINC4743780 ZINC | 0.556 | 437.4 Da LogP -0.97 TPSA 182.6 | 1 viol. | ✓ Clean |
Cc1ccc(S(=O)(=O)OC[C@@H]2O[C@@H](n3cnc4c(=O)[nH…
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| ZINC4743782 ZINC | 0.556 | 437.4 Da LogP -0.97 TPSA 182.6 | 1 viol. | ✓ Clean |
Cc1ccc(S(=O)(=O)OC[C@H]2O[C@@H](n3cnc4c(=O)[nH]…
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| ZINC4743783 ZINC | 0.556 | 437.4 Da LogP -0.97 TPSA 182.6 | 1 viol. | ✓ Clean |
Cc1ccc(S(=O)(=O)OC[C@@H]2O[C@@H](n3cnc4c(=O)[nH…
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| ZINC100058967 ZINC | 0.551 | 443.2 Da LogP -2.45 TPSA 252.6 | 2 viol. | ✓ Clean |
Nc1nc(=O)c2ncn([C@H]3O[C@H](CO[P@](=O)(O)OP(=O)…
|
| ZINC12501360 ZINC | 0.551 | 363.2 Da LogP -2.57 TPSA 206.0 | 1 viol. | ✓ Clean |
Nc1nc2c(ncn2[C@@H]2O[C@H](CO)[C@@H](O)[C@@H]2OP…
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| ZINC12504287 ZINC | 0.551 | 443.2 Da LogP -2.45 TPSA 252.6 | 2 viol. | ✓ Clean |
Nc1nc(=O)c2ncn([C@@H]3O[C@@H](CO[P@@](=O)(O)OP(…
|
| ZINC12504288 ZINC | 0.551 | 443.2 Da LogP -2.45 TPSA 252.6 | 2 viol. | ✓ Clean |
Nc1nc(=O)c2ncn([C@H]3O[C@@H](CO[P@@](=O)(O)OP(=…
|
| ZINC31308647 ZINC | 0.551 | 443.2 Da LogP -2.45 TPSA 252.6 | 2 viol. | ✓ Clean |
Nc1nc(=O)c2ncn([C@@H]3O[C@@H](CO[P@@](=O)(O)OP(…
|
| ZINC106686432 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@H]1O[C@@H](CO[P@](=O)(O)OP…
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| ZINC12958393 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@@H]1O[C@@H](CO[P@](=O)(O)O…
|
| ZINC35024781 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@H]1O[C@@H](CO[P@@](=O)(O)O…
|
| ZINC35024785 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@H]1O[C@@H](CO[P@@](=O)(O)O…
|
| ZINC35024786 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@@H]1O[C@@H](CO[P@@](=O)(O)…
|
| ZINC4261903 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@@H]1O[C@H](CO[P@@](=O)(O)O…
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| ZINC80601236 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@@H]1O[C@H](CO[P@@](=O)(O)O…
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| ZINC95921560 ZINC | 0.545 | 428.2 Da LogP -2.03 TPSA 226.5 | 2 viol. | ✓ Clean |
O=c1[nH]cnc2c1ncn2[C@H]1O[C@@H](CO[P@@](=O)(O)O…
|
| ZINC1532637 ZINC | 0.542 | 283.2 Da LogP -2.69 TPSA 159.5 | ✓ Ro5 | ✓ Clean |
Nc1nc2c(ncn2[C@H]2O[C@@H](CO)[C@H](O)[C@@H]2O)c…
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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.