KpKP13 Protein target profile

Polyribonucleotide nucleotidyltransferase

Accession: KP13_31491

Gene: pnp AHE42512.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GY04
Length 711
Pocket druggability (P2Rank · AlphaFold DB model) 0.878
Direct ligand evidence 0 55 total records
Functional annotation 1 EC 8 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
Hit
Human identity (%)
44.578 Lower values reduce human off-target concern.
Human E-value
2.39e-08
Gut microbiome similarity
11.4% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
93.13 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) 0.878
Structure A0A0H3GY04
Pocket Pocket 1
Druggability (FPocket) 0.435
Structure A0A0H3GY04
Pocket Pocket 11
ColabFold model
P2Rank 0.791 · Pocket 1
FPocket 0.088 · Pocket 27
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 542 / 4744 genomes with a hit
Prevalence 11.4%

Sequence

Primary amino-acid sequence viewer.

MLNPIVRKFQYGQHTVTLETGMMARQATAAVMVSMDDTAVFVTVVGQKKAKPGQDFFPLTVNYQERTYAAGKIPGGFFRREGRPSEGETLIARLIDRPVRPLFPEGFVNEVQVIATVVSVNPQVNPDIVAMIGASAALSLSGIPFNGPIGAARVGYINDQYVLNPTQEELKSSKLDLVVAGTEAAVLMVESEAELLSEDQMLGAVVFGHEQQQIVIQNINDLVKEAGKPRWDWQPEAVNEALNARVAALAESRLSDAYRITDKQERYAQVDVIKSETIATLVAEDETLDANELGEILHAIEKNVVRSRVLAGEPRIDGREKDMIRGLDVRTGVLPRTHGSALFTRGETQALVTATLGTARDAQNIDELMGERTDSFLFHYNFPPYSVGETGMVGSPKRREIGHGRLAKRGVLAVMPTIEEFPYTVRVVSEITESNGSSSMASVCGASLALMDAGVPVKAAVAGIAMGLVKEGDNFVVLSDILGDEDHLGDMDFKVAGSRDGISALQMDIKIEGITKEIMQVALNQAKGARLHILGVMEQAINAPRGDISEFAPRIHTIKINPDKIKDVIGKGGSVIRALTEETGTTIEIEDDGTVKIAATDGDKAQHAIRRIEEITAEIEVGRIYNGKVTRIVDFGAFVAIGGGKEGLVHISQIADKRVEKVTDYLQMGQEVPVKVLEVDRQGRVRLSIKEATEQTPSAAAPEAPAAEQGE

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 8 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

8
  • GO:0004654 Catalysis of the reaction: RNA(n+1) + phosphate = RNA(n) + a nucleoside diphosphate.
  • GO:0003676 Binding to a nucleic acid.
  • GO:0006396 Any process involved in the conversion of one or more primary RNA transcripts into one or more mature RNA molecules.
  • GO:0003723 Binding to an RNA molecule or a portion thereof.
  • GO:0006402 The chemical reactions and pathways resulting in the breakdown of mRNA, messenger RNA, which is responsible for carrying the coded genetic 'message', transcribed from DNA, to sites of protein assembly at the ribosomes.
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0000175 Catalysis of the sequential cleavage of mononucleotides from a free 3' terminus of an RNA molecule.
  • GO:0000287 Binding to a magnesium (Mg) ion.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

60 records
Show feature table
Start End DB Term Name
145 235 SUPERFAMILY SSF55666 Ribonuclease PH domain 2-like
145 235 InterPro IPR036345 Exoribonuclease, PH domain 2 superfamily
5 233 CDD cd11363 RNase_PH_PNPase_1
10 691 NCBIfam TIGR03591 polyribonucleotide nucleotidyltransferase
10 691 InterPro IPR012162 Polyribonucleotide nucleotidyltransferase
2 234 Gene3D G3DSA:3.30.230.70 -
2 234 InterPro IPR027408 PNPase/RNase PH domain superfamily
242 320 Pfam PF03726 Polyribonucleotide nucleotidyltransferase, RNA binding domain
242 320 InterPro IPR015848 Polyribonucleotide nucleotidyltransferase, RNA-binding domain
622 689 CDD cd04472 S1_PNPase
226 325 SUPERFAMILY SSF46915 Polynucleotide phosphorylase/guanosine pentaphosphate synthase (PNPase/GPSI), domain 3
226 325 InterPro IPR036456 Polyribonucleotide nucleotidyltransferase, RNA-binding domain superfamily
550 620 Gene3D G3DSA:3.30.1370.10 K Homology domain, type 1
550 620 InterPro IPR036612 K Homology domain, type 1 superfamily
16 144 Pfam PF01138 3' exoribonuclease family, domain 1
16 144 InterPro IPR001247 Exoribonuclease, phosphorolytic domain 1
324 456 Pfam PF01138 3' exoribonuclease family, domain 1
324 456 InterPro IPR001247 Exoribonuclease, phosphorolytic domain 1
550 618 FunFam G3DSA:3.30.1370.10:FF:000001 Polyribonucleotide nucleotidyltransferase
3 693 Hamap MF_01595 Polyribonucleotide nucleotidyltransferase [pnp].
3 693 InterPro IPR012162 Polyribonucleotide nucleotidyltransferase
622 690 ProSiteProfiles PS50126 S1 domain profile.
622 690 InterPro IPR003029 S1 domain
619 690 Pfam PF00575 S1 RNA binding domain
619 690 InterPro IPR003029 S1 domain
621 691 Gene3D G3DSA:2.40.50.140 -
621 691 InterPro IPR012340 Nucleic acid-binding, OB-fold
147 210 Pfam PF03725 3' exoribonuclease family, domain 2
147 210 InterPro IPR015847 Exoribonuclease, phosphorolytic domain 2
460 527 Pfam PF03725 3' exoribonuclease family, domain 2
460 527 InterPro IPR015847 Exoribonuclease, phosphorolytic domain 2
3 234 FunFam G3DSA:3.30.230.70:FF:000001 Polyribonucleotide nucleotidyltransferase
2 698 PANTHER PTHR11252 POLYRIBONUCLEOTIDE NUCLEOTIDYLTRANSFERASE
2 698 InterPro IPR012162 Polyribonucleotide nucleotidyltransferase
235 549 Gene3D G3DSA:3.30.230.70 -
235 549 InterPro IPR027408 PNPase/RNase PH domain superfamily
689 711 MobiDBLite mobidb-lite consensus disorder prediction
3 144 SUPERFAMILY SSF54211 Ribosomal protein S5 domain 2-like
3 144 InterPro IPR020568 Ribosomal protein S5 domain 2-type fold
554 622 SUPERFAMILY SSF54791 Eukaryotic type KH-domain (KH-domain type I)
554 622 InterPro IPR036612 K Homology domain, type 1 superfamily
552 617 SMART SM00322 kh_6
552 617 InterPro IPR004087 K Homology domain
551 620 CDD cd02393 KH-I_PNPase
1 710 PIRSF PIRSF005499 PNPase
1 710 InterPro IPR012162 Polyribonucleotide nucleotidyltransferase
553 612 ProSiteProfiles PS50084 Type-1 KH domain profile.
608 692 SUPERFAMILY SSF50249 Nucleic acid-binding proteins
608 692 InterPro IPR012340 Nucleic acid-binding, OB-fold
450 548 SUPERFAMILY SSF55666 Ribonuclease PH domain 2-like
450 548 InterPro IPR036345 Exoribonuclease, PH domain 2 superfamily
235 549 FunFam G3DSA:3.30.230.70:FF:000002 Polyribonucleotide nucleotidyltransferase
324 544 CDD cd11364 RNase_PH_PNPase_2
622 692 FunFam G3DSA:2.40.50.140:FF:000023 Polyribonucleotide nucleotidyltransferase
556 614 Pfam PF00013 KH domain
556 614 InterPro IPR004088 K Homology domain, type 1
301 492 SUPERFAMILY SSF54211 Ribosomal protein S5 domain 2-like
301 492 InterPro IPR020568 Ribosomal protein S5 domain 2-type fold
620 690 SMART SM00316 S1_6
620 690 InterPro IPR022967 RNA-binding domain, S1

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
0.878
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Surrounding area
Pocket 2 P2Rank #2
0.582
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Surrounding area
Pocket 3 P2Rank #3
0.107
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Surrounding area
Pocket 4 P2Rank #4
0.057
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Surrounding area
Pocket 5 P2Rank #5
0.056
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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 #11
0.435
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Surrounding area
Pocket 2 FPocket #9
0.43
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Surrounding area
Pocket 3 FPocket #4
0.202
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Surrounding area
Residue sets
UniProt: Binding site:486-486
UniProt: Binding site:492-492
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_A0A0H3GY04
AlphaFold DB full sequence Viewing
ColabFold KP13_31491
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.

55 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 5 records from similar proteins
Structural ligands 5 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
FLC PDB via homolog Detail RCSB PDB
PPV PDB via homolog Detail RCSB PDB
VGL PDB via homolog Detail RCSB PDB
WO4 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 A7ZS61 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…
FLC RCSB PDB A7ZS61 189.1 Da LogP -5.25 TPSA 140.6 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O
PPV RCSB PDB Q2FZ20 178.0 Da LogP -0.81 TPSA 124.3 ✓ Ro5 ✓ Clean OP(=O)(O)OP(=O)(O)O
VGL RCSB PDB P9WH43 124.1 Da LogP 0.17 TPSA 63.1 ✓ Ro5 ✓ Clean c1cnc(cn1)C(=O)O
WO4 RCSB PDB P05055 247.8 Da LogP -2.62 TPSA 80.3 ✓ Ro5 ✓ Clean [O-][W](=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.