Protein target profile

KP13_00003

Ribose operon repressor

Genome: KpKP13 Gene: rbsR AHE47114.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GG52

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Length 327

Pocket druggability 0.585

Direct ligand evidence 0 43 total records

Functional annotation 0 EC 4 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.

Main supporting evidence

No similar human protein detected The current BLAST sequence screen did not find a significant human match, lowering apparent off-target risk. Moderate predicted binding pocket FPocket selected-pocket score 0.58. This supports review but is not experimental validation. Second pocket predictor agrees P2Rank predicted binding-site probability 0.63. Structure available AlphaFold DB model + ColabFold model Review the complete evidence below

Risks to review

Evidence gaps

No metabolic context No SBML/network-derived reaction evidence is loaded for 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: 2.5% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG): Y
DEG identity (%): 45.593 Higher values support similarity to known essential genes.
DEG E-value: 2.8100000000000003e-109 Smaller values mean stronger essential-gene similarity.

Localization

Localization: Cytoplasmic

Structure confidence

ColabFold pLDDT: 90.57 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

The 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.

FPocket 0.585

Structure A0A0H3GG52

Pocket Pocket 7

P2Rank 0.63

Structure A0A0H3GG52

Pocket Pocket 1

ColabFold model

FPocket 0.222 · Pocket 8

P2Rank 0.525 · Pocket 1

Core conservation Accessory gene

Roary core

CoreCruncher accessory

Gut microbiome 120 / 4744 genomes with a hit

Prevalence 2.5%

Cross-references

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

Sequence

UniProt A0A0H3GG52

Sequence

Primary amino-acid sequence viewer.

MKDVARIAGVSTSTVSHVINKDRFVSEAITAKVDAAIKSLNYAPSALARSLKLNQTRTIGMLITASTNPFYSELVRGVERSCFERGYSLVLCNTEGDEQRMNRNLETLMQKRVDGLLLLCTETHQPSPEIMQRYPSVPTVMMDWAPFDGDSDLIQDNSLLGGDMATQYLIDQGHSRIACIAGPLDKTPARLRLEGYHAAMARCGLPVAEGYVVTSDFEFGGGFSAMQQLLALPQRPQAVFVGNDAMAVGAYQALYQAGLQIPQDMALVGYDDIELARYMTPPLTTIHQPKDELGELAIDVLIHRMADPQQKQQRVQLTPELVVRGSA

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

4 GO

Gene Ontology (GO)

GO:0006355 Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
GO:0003677 Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
GO:0003700 A transcription regulator activity that modulates transcription of gene sets via selective and non-covalent binding to a specific double-stranded genomic DNA sequence (sometimes referred to as a motif) within a cis-regulatory region. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units, and include bacterial operons.
GO:0000976 Binding to a specific sequence of DNA that is part of a regulatory region that controls transcription of that section of the DNA. The transcribed region might be described as a gene, cistron, or operon.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

20 records

Show feature table

Start	End	DB	Term	Name
1	68	SMART	SM00354	laci3
1	68	InterPro	IPR000843	LacI-type HTH domain
1	326	PANTHER	PTHR30146	LACI-RELATED TRANSCRIPTIONAL REPRESSOR
1	53	ProSiteProfiles	PS50932	LacI-type HTH domain profile.
1	53	InterPro	IPR000843	LacI-type HTH domain
158	321	Gene3D	G3DSA:3.40.50.2300	-
57	326	SUPERFAMILY	SSF53822	Periplasmic binding protein-like I
57	326	InterPro	IPR028082	Periplasmic binding protein-like I
67	319	Gene3D	G3DSA:3.40.50.2300	-
1	56	SUPERFAMILY	SSF47413	lambda repressor-like DNA-binding domains
1	56	InterPro	IPR010982	Lambda repressor-like, DNA-binding domain superfamily
1	56	Gene3D	G3DSA:1.10.260.40	-
58	326	CDD	cd06275	PBP1_PurR
1	19	ProSitePatterns	PS00356	LacI-type HTH domain signature.
166	326	Pfam	PF13377	Periplasmic binding protein-like domain
166	326	InterPro	IPR046335	Transcriptional regulator LacI/GalR-like, sensor domain
1	45	Pfam	PF00356	Bacterial regulatory proteins, lacI family
1	45	InterPro	IPR000843	LacI-type HTH domain
2	52	CDD	cd01392	HTH_LacI
2	52	InterPro	IPR000843	LacI-type HTH domain

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 · FPocket

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

Site 1 FPocket #7

0.585

Unusual size

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Surrounding area

Site 2 FPocket #1

0.342

Likely same site as P2Rank 1 2.3 Å 16 shared residues 89% of smaller site

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Surrounding area

Binding pockets · P2Rank

Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Site 1 P2Rank #1

0.63

Likely same site as FPocket 1 2.3 Å 16 shared residues 89% of smaller site

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Surrounding area

Site 2 P2Rank #2

0.158

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Surrounding area

Site 3 P2Rank #3

0.017

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Surrounding area

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_A0A0H3GG52	AlphaFold DB	—	—	full sequence	—	Viewing
ColabFold KP13_00003	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.

43 records

Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records

Transferred evidence 6 records from similar proteins

Structural ligands 6 0 loaded crystals

Measured bioactivity 0 direct and transferred ChEMBL records

Proposed compounds 37 similarity-based ZINC candidates

Best available ligand signal

171 PDB via homolog 201.2 Da · LogP 0.99 · TPSA 66.4 Open detail RCSB PDB

6MP PDB via homolog Detail RCSB PDB

ADE PDB via homolog Detail RCSB PDB

GUN PDB via homolog Detail RCSB PDB

HPA PDB via homolog Detail RCSB PDB

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
171 RCSB PDB	1SXG	P46828	201.2 Da LogP 0.99 TPSA 66.4	✓ Ro5	✓ Clean	`c1ccc(cc1)NCCS(=O)(=O)O`
6MP RCSB PDB	2PUA	P0ACP7	134.1 Da LogP 0.66 TPSA 54.5	✓ Ro5	✓ Clean	`Cc1c2c(nc[nH]2)ncn1`
ADE RCSB PDB	2PUB	P0ACP7	135.1 Da LogP -0.06 TPSA 80.5	✓ Ro5	✓ Clean	`c1[nH]c2c(n1)c(ncn2)N`
GUN RCSB PDB	1WET	P0ACP7	151.1 Da LogP -0.77 TPSA 100.5	✓ Ro5	✓ Clean	`c1[nH]c2c(n1)C(=O)NC(=N2)N`
HPA RCSB PDB	1BDH	P0ACP7	136.1 Da LogP -0.35 TPSA 74.4	✓ Ro5	✓ Clean	`c1[nH]c2c(n1)N=CNC2=O`
RIP RCSB PDB	4ZJP	A6VKT0	150.1 Da LogP -2.58 TPSA 90.2	✓ Ro5	✓ Clean	`C1[C@H]([C@H]([C@H]([C@@H](O1)O)O)O)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
ZINC2170599 ZINC	1.000	201.2 Da LogP 0.99 TPSA 66.4	✓ Ro5	✓ Clean	`O=S(=O)(O)CCNc1ccccc1`
ZINC2170604 ZINC	0.786	215.3 Da LogP 1.38 TPSA 66.4	✓ Ro5	✓ Clean	`O=S(=O)(O)CCCNc1ccccc1`
ZINC9974955 ZINC	0.625	215.0 Da LogP 0.41 TPSA 74.4	✓ Ro5	✓ Clean	`O=c1[nH]c(Br)nc2[nH]cnc12`
ZINC255980408 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1OC[C@@H](O[C@H]2OC[C@@H](O[C@H]3OC[C@@H]…`
ZINC255980409 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1OC[C@@H](O[C@H]2OC[C@@H](O[C@H]3OC[C@@H]…`
ZINC255980410 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@@H]1[C@H](O)[C@@H](O[C@@H]2CO[C@H](O[C@@H]3…`
ZINC255980411 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1OC[C@@H](O[C@H]2OC[C@@H](O[C@H]3OC[C@@H]…`
ZINC263584059 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@@H]1[C@@H](O[C@@H]2OC[C@@H](O)[C@H](O)[C@H]…`
ZINC263584060 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1[C@H](O)[C@@H](O[C@@H]2CO[C@@H](O)[C@H](…`
ZINC263584061 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@@H]1[C@@H](O[C@H]2OC[C@@H](O)[C@H](O)[C@H]2…`
ZINC4095690 ZINC	0.577	282.2 Da LogP -4.12 TPSA 149.1	1 viol.	✓ Clean	`O[C@H]1[C@H](O)CO[C@@H](O[C@@H]2CO[C@H](O)[C@H]…`
ZINC4095691 ZINC	0.577	282.2 Da LogP -4.12 TPSA 149.1	1 viol.	✓ Clean	`O[C@H]1[C@H](O)CO[C@@H](O[C@@H]2CO[C@@H](O)[C@H…`
ZINC64622127 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1[C@H](O)CO[C@@H](O[C@@H]2CO[C@@H](O[C@@H…`
ZINC78590548 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1[C@H](O)CO[C@@H](O[C@@H]2CO[C@@H](O[C@@H…`
ZINC85546060 ZINC	0.577	414.4 Da LogP -5.66 TPSA 208.0	2 viol.	✓ Clean	`O[C@H]1[C@H](O)[C@@H](O[C@@H]2CO[C@@H](O)[C@H](…`
ZINC4430249 ZINC	0.571	246.0 Da LogP 0.96 TPSA 54.5	✓ Ro5	✓ Clean	`Ic1ncnc2nc[nH]c12`
ZINC8627299 ZINC	0.571	262.0 Da LogP 0.25 TPSA 74.4	✓ Ro5	✓ Clean	`O=c1[nH]cnc2nc(I)[nH]c12`
ZINC1648199 ZINC	0.560	212.3 Da LogP 3.21 TPSA 24.1	✓ Ro5	✓ Clean	`c1ccc(NCCNc2ccccc2)cc1`
ZINC8615502 ZINC	0.552	270.3 Da LogP 1.17 TPSA 108.9	✓ Ro5	✓ Clean	`c1nc(Sc2ncnc3nc[nH]c23)c2[nH]cnc2n1`
ZINC12174637 ZINC	0.545	229.3 Da LogP 0.90 TPSA 83.5	✓ Ro5	✓ Clean	`O=C(CCS(=O)(=O)O)Nc1ccccc1`
ZINC43463386 ZINC	0.533	261.0 Da LogP 0.54 TPSA 80.5	✓ Ro5	✓ Clean	`Nc1nc(I)nc2[nH]cnc12`
ZINC4552271 ZINC	0.533	237.5 Da LogP 2.18 TPSA 54.5	✓ Ro5	✓ Clean	`ClC(Cl)(Cl)c1ncnc2[nH]cnc12`
ZINC4707072 ZINC	0.533	214.0 Da LogP 0.70 TPSA 80.5	✓ Ro5	✓ Clean	`Nc1nc(Br)nc2[nH]cnc12`
ZINC12428236 ZINC	0.529	232.2 Da LogP -0.74 TPSA 146.4	✓ Ro5	✓ Clean	`Nc1c2nc[nH]c2c(N)c2[nH]c(=O)c(=O)[nH]c12`
ZINC4806366 ZINC	0.529	231.3 Da LogP 0.35 TPSA 86.6	✓ Ro5	✓ Clean	`O=S(=O)(O)C[C@@H](O)CNc1ccccc1`
ZINC1847900 ZINC	0.519	226.3 Da LogP 3.60 TPSA 24.1	✓ Ro5	✓ Clean	`c1ccc(NCCCNc2ccccc2)cc1`
ZINC1574855 ZINC	0.516	204.1 Da LogP 0.67 TPSA 74.4	✓ Ro5	✓ Clean	`O=c1[nH]cnc2nc(C(F)(F)F)[nH]c12`
ZINC95415357 ZINC	0.515	228.3 Da LogP 1.04 TPSA 58.2	✓ Ro5	✓ Clean	`CCS(=O)(=O)NCCNc1ccccc1`
ZINC100082001 ZINC	0.500	312.3 Da LogP -5.37 TPSA 180.3	1 viol.	✓ Clean	`O[C@@H]1[C@H](O[C@H]2OC[C@@H](O)[C@H](O)[C@H]2O…`
ZINC148572871 ZINC	0.500	263.3 Da LogP 2.55 TPSA 66.4	✓ Ro5	✓ Clean	`O=S(=O)(O)c1ccccc1CNc1ccccc1`
ZINC1511379 ZINC	0.500	230.0 Da LogP -0.01 TPSA 100.4	✓ Ro5	✓ Clean	`Nc1nc2[nH]c(Br)nc2c(=O)[nH]1`
ZINC238628781 ZINC	0.500	213.2 Da LogP 0.71 TPSA 87.3	✓ Ro5	✓ Clean	`O=c1[nH]c(-c2ccccn2)nc2[nH]cnc12`
ZINC25722093 ZINC	0.500	281.3 Da LogP -4.55 TPSA 151.9	1 viol.	✓ Clean	`O[C@H]1[C@H](O)CO[C@@H](N[C@@H]2OC[C@@H](O)[C@H…`
ZINC4878369 ZINC	0.500	277.0 Da LogP -0.17 TPSA 100.4	✓ Ro5	✓ Clean	`Nc1nc2[nH]c(I)nc2c(=O)[nH]1`
ZINC5543260 ZINC	0.500	200.2 Da LogP -0.40 TPSA 108.8	✓ Ro5	✓ Clean	`O=S(=O)(O)c1ncnc2[nH]cnc12`
ZINC6514392 ZINC	0.500	260.3 Da LogP 1.65 TPSA 90.3	✓ Ro5	✓ Clean	`N=C(Nc1ccccc1)SCCS(=O)(=O)O`
ZINC757131928 ZINC	0.500	227.2 Da LogP 0.25 TPSA 103.1	✓ Ro5	✓ Clean	`N#Cc1ccc(NCCS(=O)(=O)O)cn1`

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.