KpKP13 Protein target profile

Bifunctional (p)ppGpp synthase/hydrolase SpoT

Accession: KP13_00164

Gene: spoT AHE42084.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GYT9
Length 706
Pocket druggability (P2Rank · AlphaFold DB model) 0.896
Direct ligand evidence 0 62 total records
Functional annotation 1 EC 7 GO
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

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
Hit
Human identity (%)
37.778 Lower values reduce human off-target concern.
Human E-value
6.03e-12
Gut microbiome similarity
3.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
81.79 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) 0.896
Structure A0A0H3GYT9
Pocket Pocket 1
Druggability (FPocket) 0.313
Structure A0A0H3GYT9
Pocket Pocket 30
ColabFold model
P2Rank 0.852 · Pocket 1
FPocket 0.596 · Pocket 32
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 171 / 4744 genomes with a hit
Prevalence 3.6%

Sequence

Primary amino-acid sequence viewer.

MYLFESLNQLIQNYLPEDQIKRLRQAYLVARDAHEGQTRSSGEPYITHPVAVACILAEMKLDYETLMAALLHDVIEDTPATYQDMEQLFGKSVAELVEGVSKLDKLKFRDKKEAQAENFRKMIMAMVQDIRVILIKLADRTHNMRTLGSLRPDKRRRIARETLEIYSPLAHRLGIHHIKTELEELGFEALYPNRYRVIKEVVKAARGNRKEMIQKILSEIEGRLQEAGIPCRVSGREKHLYSIYCKMVLKEQRFHSIMDIYAFRVIVHDADICYRVLGQMHSLYKPRPGRFKDYIAIPKANGYQSLHTSMIGPHGVPVEVQIRTEDMDQMAEMGVAAHWAYKEHGGESSTTAQIRAQRWMQSLLELQQSAGSSFEFIESVKSDLFPDEIYVFTPEGRIVELPAGATPVDFAYAVHTDIGHACVGARVDRQPYPLSQPLSSGQTVEIITAPGARPNAAWLNFVVSSKARAKIRQLLKNLKRDDSVSLGRRLLNHALGGSRKLAEIPPENIQRELDRMKLASLDDLLAEIGLGNAMSVVVAKNLQQGEAAAAPVPANASNHGHLPIKGADGVLITFAKCCRPIPGDPIIAHVSPGKGLVIHHESCRNIRGYQKEPEKFMAVEWDKETAQEFITEIKVDMFNHQGALANLTAAINTASSNIQSLNTEEKDGRVYSAFIRLTARDRVHLANIMRKIRVMPDVIKVTRNRN

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 7 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

7
  • GO:0015969 The chemical reactions and pathways involving guanine tetraphosphate (5'-ppGpp-3'), a derivative of guanine riboside with four phosphates.
  • GO:0005886 The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
  • GO:0008728 Catalysis of the reaction: ATP + GTP = AMP + guanosine 3'-diphosphate 5'-triphosphate.
  • GO:0008893 Catalysis of the reaction: guanosine 3',5'-bis(diphosphate) + H2O = diphosphate + GDP + H+.
  • GO:0015970 The chemical reactions and pathways resulting in the formation of guanine tetraphosphate (5'-ppGpp-3'), a derivative of guanine riboside with four phosphates.
  • GO:0015949 The chemical reactions and pathways by which a nucleobase, nucleoside or nucleotide small molecule is synthesized from another nucleobase, nucleoside or nucleotide small molecule.
  • GO:0042594 Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a starvation stimulus, deprivation of nourishment.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

47 records
Show feature table
Start End DB Term Name
192 325 FunFam G3DSA:3.30.460.10:FF:000001 GTP pyrophosphokinase RelA
626 703 Pfam PF13291 ACT domain
626 703 InterPro IPR002912 ACT domain
644 664 Coils Coil Coil
627 706 FunFam G3DSA:3.30.70.260:FF:000006 (P)ppGpp synthase/hydrolase SpoT
382 455 FunFam G3DSA:3.10.20.30:FF:000002 GTP pyrophosphokinase (RelA/SpoT)
382 456 Gene3D G3DSA:3.10.20.30 -
382 456 InterPro IPR012675 Beta-grasp domain superfamily
633 703 CDD cd04876 ACT_RelA-SpoT
627 706 Gene3D G3DSA:3.30.70.260 -
632 706 ProSiteProfiles PS51671 ACT domain profile.
632 706 InterPro IPR002912 ACT domain
26 703 NCBIfam TIGR00691 RelA/SpoT family protein
26 703 InterPro IPR004811 RelA/SpoT family
389 448 Pfam PF02824 TGS domain
389 448 InterPro IPR004095 TGS
214 333 CDD cd05399 NT_Rel-Spo_like
214 333 InterPro IPR007685 RelA/SpoT
2 191 FunFam G3DSA:1.10.3210.10:FF:000001 GTP pyrophosphokinase RelA
26 175 Pfam PF13328 HD domain
2 190 Gene3D G3DSA:1.10.3210.10 Hypothetical protein af1432
235 345 SMART SM00954 RelA_SpoT_2
235 345 InterPro IPR007685 RelA/SpoT
235 344 Pfam PF04607 Region found in RelA / SpoT proteins
235 344 InterPro IPR007685 RelA/SpoT
631 703 SUPERFAMILY SSF55021 ACT-like
631 703 InterPro IPR045865 ACT-like domain
5 703 PANTHER PTHR21262 GUANOSINE-3',5'-BIS DIPHOSPHATE 3'-PYROPHOSPHOHYDROLASE
376 448 SUPERFAMILY SSF81271 TGS-like
376 448 InterPro IPR012676 TGS-like
387 448 ProSiteProfiles PS51880 TGS domain profile.
387 448 InterPro IPR004095 TGS
41 153 SMART SM00471 hd_13
41 153 InterPro IPR003607 HD/PDEase domain
2 190 SUPERFAMILY SSF109604 HD-domain/PDEase-like
43 166 CDD cd00077 HDc
43 166 InterPro IPR003607 HD/PDEase domain
192 325 Gene3D G3DSA:3.30.460.10 Beta Polymerase, domain 2
192 325 InterPro IPR043519 Nucleotidyltransferase superfamily
390 448 CDD cd01668 TGS_RSH
390 448 InterPro IPR033655 RelA/SpoT, TGS domain
180 393 SUPERFAMILY SSF81301 Nucleotidyltransferase
180 393 InterPro IPR043519 Nucleotidyltransferase superfamily
45 144 ProSiteProfiles PS51831 HD domain profile.
45 144 InterPro IPR006674 HD domain
460 543 Pfam PF19296 RelA/SpoT, AH and RIS domains
460 543 InterPro IPR045600 RelA/SpoT, AH and RIS domains

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
0.896
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Surrounding area
Pocket 2 P2Rank #2
0.804
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Surrounding area
Pocket 3 P2Rank #3
0.361
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Surrounding area
Pocket 4 P2Rank #4
0.145
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Surrounding area
Pocket 5 P2Rank #5
0.144
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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 #30
0.313
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Surrounding area
Pocket 2 FPocket #10
0.233
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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_A0A0H3GYT9
AlphaFold DB full sequence Viewing
ColabFold KP13_00164
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.

62 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 12 records from similar proteins
Structural ligands 5 0 loaded crystals
Measured bioactivity 7 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
0O2 PDB via homolog 683.1 Da · LogP -2.10 · TPSA 392.2 Open detail RCSB PDB
APC PDB via homolog Detail RCSB PDB
G4P PDB via homolog Detail RCSB PDB
GN3 PDB via homolog Detail RCSB PDB
GPX 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
0O2 RCSB PDB W8U368 683.1 Da LogP -2.10 TPSA 392.2 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O…
APC RCSB PDB W8U368 505.2 Da LogP -1.52 TPSA 269.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
G4P RCSB PDB Q5SHL3 603.2 Da LogP -2.22 TPSA 345.6 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)CO[P@](=O…
GN3 RCSB PDB Q5SHL3 602.2 Da LogP -2.65 TPSA 348.4 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O…
GPX RCSB PDB Q54089 505.2 Da LogP -1.29 TPSA 267.9 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@H]4[C@@H]([C@H](O3)CO[P@](=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.