Promising target candidate with multiple supporting evidence streams.
Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.
Main supporting evidence
Risks to review
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
- Hit
- Human identity (%)
- 70.667 Lower values reduce human off-target concern.
- Human E-value
- 1.3e-29
- Gut microbiome similarity
- 5.5% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.
Essentiality
- Essential (DEG)
- Y
- DEG identity (%)
- 96.287 Higher values support similarity to known essential genes.
- DEG E-value
- 0.0 Smaller values mean stronger essential-gene similarity.
Localization
- Localization
- Cytoplasmic
Structure confidence
- ColabFold pLDDT
- 95.66 0-100 confidence; >70 supports local structural interpretation.
Binding-site evidence
AlphaFold DB / UniProt modelThe 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
Sequence
Primary amino-acid sequence viewer.
MKLPIYLDYSATTPVDPRVAEKMMQFLTMDGTFGNPASRSHRFGWQAEEAVDIARNQIAELVGADPREIVFTSGATESDNLAIKGAANFYQKKGKHIITSKTEHKAVLDTCRQLEREGFEVTYLAPQSNGIIDLKELEAAMRDDTILVSIMHVNNEIGVVQDIATIGEMCRARGIIYHVDATQSVGKLPIDLSQLKVDLMSFSGHKIYGPKGIGALYVRRKPRIRIEAQIHGGGHERGMRSGTLPVHQIVGMGEAYRIAKEEMESEMARLRTLRNRLWNGVKDMEEVYLNGDLEQGAPNILNVSFNYVEGESLIMALKDLAVSSGSACTSASLEPSYVLRALGMTDELAHSSIRFSLGRFTTEEEIDYAIDLIRKSIGRLRELSPLWEMFKQGVDLNSIEWSHH
Functional annotations
Enzyme classification and Gene Ontology terms linked to this protein.
Enzyme Commission (EC)
1Gene Ontology (GO)
7- GO:0030170 Binding to pyridoxal 5' phosphate, 3-hydroxy-5-(hydroxymethyl)-2-methyl4-pyridine carboxaldehyde 5' phosphate, the biologically active form of vitamin B6.
- GO:0031071 Catalysis of the reaction: L-cysteine + [enzyme]-cysteine = L-alanine + [enzyme]-S-sulfanylcysteine.
- GO:0044571 The incorporation of two iron atoms and two sulfur atoms into an iron-sulfur cluster.
- 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:1990221 A protein complex capable of cysteine desulfurase activity decomposing L-cysteine to L-alanine and sulfur. It belongs to a ubiquitous family of pyridoxal 5-phosphate (PLP)-dependent enzymes.
- GO:0051537 Binding to a 2 iron, 2 sulfur (2Fe-2S) cluster; this cluster consists of two iron atoms, with two inorganic sulfur atoms found between the irons and acting as bridging ligands.
- GO:0046872 Binding to a metal ion.
Sequence domains and features
Domain and signature matches imported from InterPro and related databases.
Show feature table
| Start | End | DB | Term | Name |
|---|---|---|---|---|
| 257 | 368 | FunFam | G3DSA:3.90.1150.10:FF:000002 | Cysteine desulfurase IscS |
| 5 | 390 | SUPERFAMILY | SSF53383 | PLP-dependent transferases |
| 5 | 390 | InterPro | IPR015424 | Pyridoxal phosphate-dependent transferase |
| 5 | 368 | Pfam | PF00266 | Aminotransferase class-V |
| 5 | 368 | InterPro | IPR000192 | Aminotransferase class V domain |
| 5 | 368 | Gene3D | G3DSA:3.90.1150.10 | Aspartate Aminotransferase, domain 1 |
| 5 | 368 | InterPro | IPR015422 | Pyridoxal phosphate-dependent transferase, small domain |
| 256 | 276 | Coils | Coil | Coil |
| 2 | 384 | PIRSF | PIRSF005572 | NifS |
| 2 | 384 | InterPro | IPR016454 | Cysteine desulfurase |
| 197 | 216 | ProSitePatterns | PS00595 | Aminotransferases class-V pyridoxal-phosphate attachment site. |
| 197 | 216 | InterPro | IPR020578 | Aminotransferase class-V, pyridoxal-phosphate binding site |
| 16 | 263 | FunFam | G3DSA:3.40.640.10:FF:000003 | Cysteine desulfurase IscS |
| 1 | 404 | NCBIfam | TIGR02006 | IscS subfamily cysteine desulfurase |
| 1 | 404 | InterPro | IPR010240 | Cysteine desulfurase IscS |
| 16 | 263 | Gene3D | G3DSA:3.40.640.10 | - |
| 16 | 263 | InterPro | IPR015421 | Pyridoxal phosphate-dependent transferase, major domain |
| 1 | 395 | Hamap | MF_00331 | Cysteine desulfurase IscS [iscS]. |
| 1 | 395 | InterPro | IPR010240 | Cysteine desulfurase IscS |
| 3 | 384 | PANTHER | PTHR11601 | CYSTEINE DESULFURYLASE FAMILY MEMBER |
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
Residue sets
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
0 + 2Experimental 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_A0A0H3GWQ1
|
AlphaFold DB | — | — | full sequence | — | Viewing |
|
ColabFold
KP13_00845
|
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.
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 |
|---|---|---|---|---|---|---|
| 7TS RCSB PDB | O25008 | 331.2 Da LogP 0.60 TPSA 157.9 | ✓ Ro5 | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CNC2=CONC2=O)O
|
|
| 8Q1 RCSB PDB | Q9Y697 | 540.7 Da LogP 3.29 TPSA 162.3 | 1 viol. | ✓ Clean |
CCCCCCCCCCCC(=O)SCCNC(=O)CCNC(=O)[C@@H](C(C)(C)…
|
|
| C6P RCSB PDB | A0A1I5NEH3 | 352.3 Da LogP 0.18 TPSA 149.2 | 1 viol. | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN[C@@H](CS)C(=O)O)O
|
|
| DTT RCSB PDB | Q9Y697 | 154.3 Da LogP -0.43 TPSA 40.5 | ✓ Ro5 | ✓ Clean |
C([C@@H]([C@H](CS)O)O)S
|
|
| EDT RCSB PDB | Q9Y697 | 292.2 Da LogP -2.07 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
C(CN(CC(=O)O)CC(=O)O)N(CC(=O)O)CC(=O)O
|
|
| ETE RCSB PDB | Q9Y697 | 208.3 Da LogP -0.33 TPSA 57.2 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCO
|
|
| FES RCSB PDB | O29689 | 175.8 Da LogP 1.29 TPSA 0.0 | ✓ Ro5 | ✓ Clean |
S1[Fe]S[Fe]1
|
|
| HCS RCSB PDB | O25008 | 135.2 Da LogP -0.28 TPSA 63.3 | ✓ Ro5 | ✓ Clean |
C(CS)[C@@H](C(=O)O)N
|
|
| P15 RCSB PDB | Q9Y697 | 296.4 Da LogP -0.29 TPSA 75.6 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCO
|
|
| PDA RCSB PDB | O25008 | 320.2 Da LogP 0.27 TPSA 149.2 | ✓ Ro5 | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CNC(C)C(=O)O)O
|
|
| PMP RCSB PDB | O29689 | 248.2 Da LogP 0.16 TPSA 125.9 | ✓ Ro5 | ✓ Clean |
Cc1c(c(c(cn1)COP(=O)(O)O)CN)O
|
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 |
|---|---|---|---|---|---|
| ZINC1580161 ZINC | 1.000 | 208.3 Da LogP -0.33 TPSA 57.2 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCO
|
| ZINC16052118 ZINC | 1.000 | 340.4 Da LogP -0.28 TPSA 84.8 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCO
|
| ZINC16052257 ZINC | 1.000 | 384.5 Da LogP -0.26 TPSA 94.1 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC19364242 ZINC | 1.000 | 292.2 Da LogP -2.07 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC34317654 ZINC | 1.000 | 472.6 Da LogP -0.23 TPSA 112.5 | 1 viol. | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC44076059 ZINC | 1.000 | 428.5 Da LogP -0.24 TPSA 103.3 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC5210101 ZINC | 1.000 | 252.3 Da LogP -0.31 TPSA 66.4 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCO
|
| ZINC5997860 ZINC | 1.000 | 296.4 Da LogP -0.29 TPSA 75.6 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCO
|
| ZINC19419017 ZINC | 0.933 | 393.3 Da LogP -2.68 TPSA 196.2 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCN(CC(=O)O)CC(=O)O)CCN(CC(=O)O)CC(=O)O
|
| ZINC22593216 ZINC | 0.933 | 494.5 Da LogP -3.30 TPSA 236.8 | 1 viol. | ✓ Clean |
O=C(O)CN(CCN(CCN(CC(=O)O)CC(=O)O)CC(=O)O)CCN(CC…
|
| ZINC1769289 ZINC | 0.765 | 306.3 Da LogP -1.68 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC4683946 ZINC | 0.765 | 320.3 Da LogP -1.29 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCCCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC19364891 ZINC | 0.737 | 204.2 Da LogP -0.98 TPSA 81.1 | ✓ Ro5 | ✓ Clean |
CN(C)CCN(CC(=O)O)CC(=O)O
|
| ZINC19364892 ZINC | 0.737 | 232.3 Da LogP -0.20 TPSA 81.1 | ✓ Ro5 | ✓ Clean |
CCN(CC)CCN(CC(=O)O)CC(=O)O
|
| ZINC19366122 ZINC | 0.737 | 278.3 Da LogP -2.16 TPSA 138.6 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCO)CCN(CC(=O)O)CC(=O)O
|
| ZINC33806192 ZINC | 0.737 | 320.3 Da LogP -1.29 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CCN(CCC(=O)O)CCN(CC(=O)O)CC(=O)O
|
| ZINC5908834 ZINC | 0.737 | 379.3 Da LogP -2.09 TPSA 196.2 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCN(CCN(CC(=O)O)CC(=O)O)C(=O)O)CC(=O)O
|
| ZINC575419714 ZINC | 0.727 | 312.4 Da LogP 0.42 TPSA 66.4 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCSCCOCCOCCO
|
| ZINC2527900 ZINC | 0.722 | 205.2 Da LogP -1.07 TPSA 115.1 | ✓ Ro5 | ✓ Clean |
O=C(O)CCN(CC(=O)O)CC(=O)O
|
| ZINC4261886 ZINC | 0.722 | 348.4 Da LogP -0.51 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCCCCCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC115163232 ZINC | 0.700 | 222.3 Da LogP 0.07 TPSA 57.2 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCCO
|
| ZINC149813449 ZINC | 0.700 | 278.2 Da LogP -1.48 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCN(CC(=O)O)C(=O)O)CC(=O)O
|
| ZINC258837490 ZINC | 0.700 | 354.4 Da LogP 0.11 TPSA 84.8 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCCO
|
| ZINC12501520 ZINC | 0.688 | 458.5 Da LogP -0.88 TPSA 123.5 | 1 viol. | ✓ Clean |
OCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC1692489 ZINC | 0.688 | 222.3 Da LogP 0.33 TPSA 46.2 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOC
|
| ZINC3874716 ZINC | 0.688 | 414.5 Da LogP -0.90 TPSA 114.3 | ✓ Ro5 | ✓ Clean |
OCCOCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC4283769 ZINC | 0.688 | 238.3 Da LogP -0.96 TPSA 77.4 | ✓ Ro5 | ✓ Clean |
OCCOCCOCCOCCOCCO
|
| ZINC4521548 ZINC | 0.688 | 282.3 Da LogP -0.95 TPSA 86.6 | ✓ Ro5 | ✓ Clean |
OCCOCCOCCOCCOCCOCCO
|
| ZINC4530388 ZINC | 0.688 | 266.3 Da LogP 0.35 TPSA 55.4 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOC
|
| ZINC5178829 ZINC | 0.688 | 326.4 Da LogP -0.93 TPSA 95.8 | ✓ Ro5 | ✓ Clean |
OCCOCCOCCOCCOCCOCCOCCO
|
| ZINC5178830 ZINC | 0.688 | 370.4 Da LogP -0.91 TPSA 105.1 | ✓ Ro5 | ✓ Clean |
OCCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC5701172 ZINC | 0.688 | 310.4 Da LogP 0.36 TPSA 64.6 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOC
|
| ZINC5997861 ZINC | 0.688 | 398.5 Da LogP 0.40 TPSA 83.1 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCOCCOCCOCCOCCOCCOC
|
| ZINC22576460 ZINC | 0.684 | 320.3 Da LogP -1.29 TPSA 155.7 | ✓ Ro5 | ✓ Clean |
O=C(O)CCN(CCN(CCC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC575432150 ZINC | 0.667 | 344.4 Da LogP -0.89 TPSA 100.5 | ✓ Ro5 | ✓ Clean |
COCCOCCOCCS(=O)(=O)CCOCCOCCO
|
| ZINC90669676 ZINC | 0.667 | 377.4 Da LogP -2.57 TPSA 176.0 | ✓ Ro5 | ✓ Clean |
O=CCN(CCN(CC(=O)O)CC(=O)O)CCN(CC(=O)O)CC(=O)O
|
| ZINC1532705 ZINC | 0.660 | 249.2 Da LogP 0.20 TPSA 120.1 | ✓ Ro5 | ✓ Clean |
Cc1ncc(COP(=O)(O)O)c(CO)c1O
|
| ZINC1857524240 ZINC | 0.652 | 207.3 Da LogP -0.75 TPSA 60.0 | ✓ Ro5 | ✓ Clean |
COCCNCCOCCOCCO
|
| ZINC22052182 ZINC | 0.650 | 336.3 Da LogP -2.05 TPSA 164.9 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCOCCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC217755395 ZINC | 0.636 | 263.2 Da LogP -1.47 TPSA 147.8 | ✓ Ro5 | ✓ Clean |
O=NN(CCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC1532708 ZINC | 0.620 | 248.2 Da LogP 0.16 TPSA 125.9 | ✓ Ro5 | ✓ Clean |
Cc1ncc(COP(=O)(O)O)c(CN)c1O
|
| ZINC3055005 ZINC | 0.619 | 204.2 Da LogP -0.63 TPSA 126.6 | ✓ Ro5 | ✓ Clean |
N[C@@H](CCCC[C@H](N)C(=O)O)C(=O)O
|
| ZINC3055007 ZINC | 0.619 | 204.2 Da LogP -0.63 TPSA 126.6 | ✓ Ro5 | ✓ Clean |
N[C@@H](CCCC[C@@H](N)C(=O)O)C(=O)O
|
| ZINC3055010 ZINC | 0.619 | 204.2 Da LogP -0.63 TPSA 126.6 | ✓ Ro5 | ✓ Clean |
N[C@H](CCCC[C@@H](N)C(=O)O)C(=O)O
|
| ZINC3861663 ZINC | 0.619 | 380.4 Da LogP -2.04 TPSA 174.1 | ✓ Ro5 | ✓ Clean |
O=C(O)CN(CCOCCOCCN(CC(=O)O)CC(=O)O)CC(=O)O
|
| ZINC21297783 ZINC | 0.609 | 419.4 Da LogP -3.36 TPSA 179.8 | ✓ Ro5 | ✓ Clean |
CNC(=O)CN(CCN(CCN(CC(=O)O)CC(=O)NC)CC(=O)O)CC(=…
|
| ZINC5650743 ZINC | 0.600 | 222.3 Da LogP 0.07 TPSA 57.2 | ✓ Ro5 | ✓ Clean |
CCOCCOCCOCCOCCO
|
| ZINC6403917 ZINC | 0.600 | 354.4 Da LogP 0.11 TPSA 84.8 | ✓ Ro5 | ✓ Clean |
CCOCCOCCOCCOCCOCCOCCOCCO
|
| ZINC1555367 ZINC | 0.591 | 232.3 Da LogP 0.15 TPSA 126.6 | ✓ Ro5 | ✓ Clean |
N[C@@H](CCCCCC[C@@H](N)C(=O)O)C(=O)O
|
| ZINC1720127 ZINC | 0.591 | 218.3 Da LogP -0.24 TPSA 126.6 | ✓ Ro5 | ✓ Clean |
N[C@@H](CCCCC[C@H](N)C(=O)O)C(=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.