KpATCC43816 Protein target profile

type II secretion system protein D

Accession: VK055_2408

Gene: gspD AIK81005.1 3D evidence: Experimental + AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GIG3
Length 657
Pocket druggability (P2Rank · AlphaFold DB model) 0.233
Direct ligand evidence 0 52 total records
Functional annotation 0 EC 6 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
No hit
Gut microbiome similarity
1.2% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
N
DEG identity (%)
67.442 Higher values support similarity to known essential genes.

Structure confidence

ColabFold pLDDT
82.99 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) 0.233
Structure A0A0H3GIG3
Pocket Pocket 1
Druggability (FPocket) 0.395
Structure A0A0H3GIG3
Pocket Pocket 11
ColabFold model
P2Rank 0.082 · Pocket 1
FPocket 0.634 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 59 / 4744 genomes with a hit
Prevalence 1.2%

Metabolic context

Reactions catalyzed, pathway membership, and centrality in the genome-scale metabolic network.

This protein is not associated with the imported metabolic network for this genome.

Browse the genome's metabolic network

Imported from KpATCC43816.sbml · 2026-07-09

Sequence

Primary amino-acid sequence viewer.

MKRLRKMLPALLILTPLLFSPAAAEEFSASFKGTDIQEFINTVSKNLNKTVIIDPSVRGTITVRSYDMLNEEQYYQFFLSVLDVYGFAVINMNNGVLKVVRAKDAKTSAVPVASAAAPGEGDEVVTRVVPLTNVAARDLAPLLRQLNDNAGAGSVVHYEPSNVLLMTGRAAVIKRLLTIVERVDNAGDRSVVTVPLSWASAAEVVKLVTELNKDTSKSALPGSMVANVVADERTNAVLVSGEPNSRQRIIAMIKQLDRQQAVQGNTKVIYLKYAKAADLVEVLTGISSSLQSDKQSARPVAAIDKNIIIKAHGQTNALIVTAAPDVMNDLERVIAQLDIRRPQVLVEAIIAEVQDADGLNLGIQWANKNAGMTQFTNSGLPISTAIAGANQYNKDGTISSSLASALGSFNGIAAGFYQGNWAMLLTALSSSTKNDILATPSIVTLDNMQATFNVGQEVPVLTGSQTTSGDNIFNTVERKTVGIKLKVKPQINEGDAVLLEIEQEVSSVADSASSTSSDLGATFNTRTVNNAVLVGSGETVVVGGLLDKTVTDTADKVPLLGDIPVIGALFRSDSKKVSKRNLMLFIRPTIIRDRDEYRQASSGQYTAFNNAQTKQRGKESSEASLSNDLLHIYPQQETQAFRQVSAAIDAFNLGGRP

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Subcellular localization

Localization
OuterMembrane

Gene Ontology (GO)

6
  • GO:0009306 The controlled release of proteins from a cell.
  • GO:0019867 The external membrane of Gram-negative bacteria or certain organelles such as mitochondria and chloroplasts; freely permeable to most ions and metabolites.
  • GO:0015627 A large protein complex, containing 12-15 subunits, that spans the cell envelope of Gram-negative bacteria and mediates the movement of proteins into the extracellular environment. The complex includes a component in the cytoplasm, an inner membrane subcomplex that reaches into the periplasmic compartment and a secretion pore in the outer membrane. Proteins using the Type II pathway are transported across the cytoplasmic membrane by the Sec or Tat complex.
  • GO:0015628 The process in which proteins are secreted across the outer membrane of Gram-negative bacteria by the type II secretion system. Proteins using this pathway are first translocated across the cytoplasmic membrane via the Sec or Tat pathways.
  • GO:0009279 A lipid bilayer that forms the outermost membrane of the cell envelope; enriched in polysaccharide and protein; the outer leaflet of the membrane contains specific lipopolysaccharide structures.
  • GO:0042802 Binding to an identical protein or proteins.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

37 records
Show feature table
Start End DB Term Name
20 186 Gene3D G3DSA:3.30.1370.120 -
20 186 InterPro IPR038591 NolW-like superfamily
1 24 SignalP_EUK SignalP-noTM SignalP-noTM
537 570 ProSitePatterns PS00875 Bacterial type II secretion system protein D signature.
537 570 InterPro IPR004845 Type II secretion system protein GspD, conserved site
20 24 Phobius SIGNAL_PEPTIDE_C_REGION C-terminal region of a signal peptide.
24 614 PANTHER PTHR30332 PROBABLE GENERAL SECRETION PATHWAY PROTEIN D
1 7 Phobius SIGNAL_PEPTIDE_N_REGION N-terminal region of a signal peptide.
259 344 Gene3D G3DSA:3.30.1370.120 -
259 344 InterPro IPR038591 NolW-like superfamily
8 19 Phobius SIGNAL_PEPTIDE_H_REGION Hydrophobic region of a signal peptide.
264 344 FunFam G3DSA:3.30.1370.120:FF:000002 General secretion pathway protein D
1 24 Phobius SIGNAL_PEPTIDE Signal peptide region
25 657 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
1 24 SignalP_GRAM_POSITIVE SignalP-TM SignalP-TM
191 261 Pfam PF03958 Bacterial type II/III secretion system short domain
191 261 InterPro IPR005644 NolW-like
266 343 Pfam PF03958 Bacterial type II/III secretion system short domain
266 343 InterPro IPR005644 NolW-like
126 187 Pfam PF03958 Bacterial type II/III secretion system short domain
126 187 InterPro IPR005644 NolW-like
30 599 NCBIfam TIGR02517 type II secretion system secretin GspD
30 599 InterPro IPR013356 Type II secretion system protein GspD
579 593 PRINTS PR00811 Bacterial general secretion pathway protein D signature
579 593 InterPro IPR001775 GspD/PilQ family
458 468 PRINTS PR00811 Bacterial general secretion pathway protein D signature
458 468 InterPro IPR001775 GspD/PilQ family
556 574 PRINTS PR00811 Bacterial general secretion pathway protein D signature
556 574 InterPro IPR001775 GspD/PilQ family
343 353 PRINTS PR00811 Bacterial general secretion pathway protein D signature
343 353 InterPro IPR001775 GspD/PilQ family
423 447 PRINTS PR00811 Bacterial general secretion pathway protein D signature
423 447 InterPro IPR001775 GspD/PilQ family
427 592 Pfam PF00263 Bacterial type II and III secretion system protein
427 592 InterPro IPR004846 Type II/III secretion system
190 258 Gene3D G3DSA:3.30.1370.120 -
190 258 InterPro IPR038591 NolW-like superfamily

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 #4
0.733
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Surrounding area
Pocket 2 P2Rank #8
0.702
Show in viewer
Surrounding area
Pocket 3 P2Rank #24
0.514
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Surrounding area
Pocket 4 P2Rank #28
0.504
Show in viewer
Surrounding area
Pocket 5 P2Rank #32
0.49
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Surrounding area
All structural evidence 1 experimental · 2 predicted

Structural evidence

1 + 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
PDB 6HCG
X-ray A Viewing
AlphaFold DB AF_A0A0H3GIG3
AlphaFold DB full sequence Loaded
ColabFold VK055_2408
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.

52 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 2 records from similar proteins
Structural ligands 2 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
CPS PDB via homolog 614.9 Da · LogP 2.88 · TPSA 147.0 Open detail RCSB PDB
LDA PDB via homolog Detail RCSB PDB
ZINC1849937 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC2008702 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC2039372 ZINC proposed compound · Tanimoto 1.000 Detail ZINC

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
CPS RCSB PDB P03666 614.9 Da LogP 2.88 TPSA 147.0 1 viol. ✓ Clean C[C@H](CCC(=O)NCCC[N+](C)(C)CCCS(=O)(=O)[O-])[C…
LDA RCSB PDB P35672 229.4 Da LogP 4.48 TPSA 23.1 ✓ Ro5 ✓ Clean CCCCCCCCCCCC[N+](C)(C)[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.

Structure