KpKP13 Protein target profile

L-lactate dehydrogenase 2

Accession: KP13_05264

Gene: ldh2 AHE44671.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GN55
Length 314
Pocket druggability (P2Rank · AlphaFold DB model) 0.859
Direct ligand evidence 0 60 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 (%)
34.359 Lower values reduce human off-target concern.
Human E-value
2.64e-36
Gut microbiome similarity
0.5% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
95.07 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) 0.859
Structure A0A0H3GN55
Pocket Pocket 1
Druggability (FPocket) 0.568
Structure A0A0H3GN55
Pocket Pocket 15
ColabFold model
P2Rank 0.893 · Pocket 1
FPocket 0.455 · Pocket 14
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 26 / 4744 genomes with a hit
Prevalence 0.5%

Sequence

Primary amino-acid sequence viewer.

MHTKARKVMIIGAGNVGASAAYALLNQSICEELILVDLNQQRAEAHAQDLSDAAAYLPGMMTISTREASDCADVDIAVITVSGGALRPGQSRLDELTSTAKIVKSIVPTMMANGFNGIFLVATNPCDIITWQVWQLSGLPRSQVLGTGVWLDTTRLRRLLAQELEIGAQSIDAFILGEHGDTQFPVWSHSSVYGTPIADLYQQRTGLPLDREAMADKVRKLGFEIYAGKGCTEYGVAGTIAEICRNIFTGSHRALAVSCILDGEYGVSGAAAGVPAVLAQGGVKQIIELQLAGEEQAKFSQSIAVIKANIARLP

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:0016616 Catalysis of an oxidation-reduction (redox) reaction in which a CH-OH group acts as a hydrogen or electron donor and reduces NAD+ or NADP.
  • GO:0019752 The chemical reactions and pathways involving carboxylic acids, any organic acid containing one or more carboxyl (COOH) groups or anions (COO-).
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
  • GO:0004459 Catalysis of the reaction: (S)-lactate + NAD+ = pyruvate + NADH + H+.
  • GO:0016491 Catalysis of an oxidation-reduction (redox) reaction, a reversible chemical reaction in which the oxidation state of an atom or atoms within a molecule is altered. One substrate acts as a hydrogen or electron donor and becomes oxidized, while the other acts as hydrogen or electron acceptor and becomes reduced.
  • 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:0006096 The chemical reactions and pathways resulting in the breakdown of a carbohydrate into pyruvate, with the concomitant production of a small amount of ATP and the reduction of NAD(P) to NAD(P)H. Glycolysis begins with the metabolism of a carbohydrate to generate products that can enter the pathway and ends with the production of pyruvate. Pyruvate may be converted to acetyl-coenzyme A, ethanol, lactate, or other small molecules.
  • GO:0006089 The chemical reactions and pathways involving lactate, the anion of lactic acid.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

31 records
Show feature table
Start End DB Term Name
2 313 PIRSF PIRSF000102 Lac_mal_DH
2 313 InterPro IPR001557 L-lactate/malate dehydrogenase
150 313 Gene3D G3DSA:3.90.110.10 -
150 313 InterPro IPR015955 Lactate dehydrogenase/glycoside hydrolase, family 4, C-terminal
4 310 PANTHER PTHR43128 L-2-HYDROXYCARBOXYLATE DEHYDROGENASE (NAD(P)(+))
5 314 Hamap MF_00488 L-lactate dehydrogenase [ldh].
5 314 InterPro IPR011304 L-lactate dehydrogenase
10 307 NCBIfam TIGR01771 L-lactate dehydrogenase
10 307 InterPro IPR011304 L-lactate dehydrogenase
1 148 Gene3D G3DSA:3.40.50.720 -
176 182 ProSitePatterns PS00064 L-lactate dehydrogenase active site.
176 182 InterPro IPR018177 L-lactate dehydrogenase, active site
6 312 CDD cd05291 HicDH_like
3 146 SUPERFAMILY SSF51735 NAD(P)-binding Rossmann-fold domains
3 146 InterPro IPR036291 NAD(P)-binding domain superfamily
7 146 Pfam PF00056 lactate/malate dehydrogenase, NAD binding domain
7 146 InterPro IPR001236 Lactate/malate dehydrogenase, N-terminal
151 311 Pfam PF02866 lactate/malate dehydrogenase, alpha/beta C-terminal domain
151 311 InterPro IPR022383 Lactate/malate dehydrogenase, C-terminal
144 162 PRINTS PR00086 L-lactate dehydrogenase signature
144 162 InterPro IPR001557 L-lactate/malate dehydrogenase
174 187 PRINTS PR00086 L-lactate dehydrogenase signature
174 187 InterPro IPR001557 L-lactate/malate dehydrogenase
120 140 PRINTS PR00086 L-lactate dehydrogenase signature
120 140 InterPro IPR001557 L-lactate/malate dehydrogenase
32 56 PRINTS PR00086 L-lactate dehydrogenase signature
32 56 InterPro IPR001557 L-lactate/malate dehydrogenase
7 31 PRINTS PR00086 L-lactate dehydrogenase signature
7 31 InterPro IPR001557 L-lactate/malate dehydrogenase
147 311 SUPERFAMILY SSF56327 LDH C-terminal domain-like
147 311 InterPro IPR015955 Lactate dehydrogenase/glycoside hydrolase, family 4, C-terminal

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
0.859
Likely same site as FPocket 15 3.0 Å 26 shared residues 100% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.128
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Surrounding area
Pocket 3 P2Rank #3
0.02
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Surrounding area
Pocket 4 P2Rank #4
0.018
Likely same site as FPocket 16 2.4 Å 10 shared residues 100% of smaller site
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Surrounding area
Pocket 5 P2Rank #5
0.01
Likely same site as FPocket 16 3.2 Å 8 shared residues 100% of smaller site
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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 #15
0.568 Unusual size
Likely same site as P2Rank 1 3.0 Å 26 shared residues 100% of smaller site
Show in viewer
Surrounding area
Pocket 2 FPocket #16
0.308
Likely same site as P2Rank 4 2.4 Å 10 shared residues 100% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Active site:179-179 Proton acceptor
UniProt: Binding site:105-105
UniProt: Binding site:12-17
UniProt: Binding site:122-124
UniProt: Binding site:124-127
UniProt: Binding site:147-147
UniProt: Binding site:152-155
UniProt: Binding site:16-16
UniProt: Binding site:232-232
UniProt: Binding site:37-37
UniProt: Binding site:42-42
UniProt: Binding site:92-92
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_A0A0H3GN55
AlphaFold DB full sequence Viewing
ColabFold KP13_05264
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.

60 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 10 records from similar proteins
Structural ligands 10 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
1E4 PDB via homolog 748.1 Da · LogP 2.97 · TPSA 238.1 Open detail RCSB PDB
1E5 PDB via homolog Detail RCSB PDB
1E6 PDB via homolog Detail RCSB PDB
1E7 PDB via homolog Detail RCSB PDB
6P3 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
1E4 RCSB PDB P13491 748.1 Da LogP 2.97 TPSA 238.1 3 viol. ✓ Clean COc1cc(c(cc1NC(=O)CSc2ccc(cn2)C(=O)O)Cl)OC[C@H]…
1E5 RCSB PDB P13491 291.2 Da LogP 2.05 TPSA 96.7 ✓ Ro5 ✓ Clean c1cc(ncc1C(=O)O)c2cc(cc(c2)F)OCC(=O)O
1E6 RCSB PDB P13491 442.9 Da LogP 1.90 TPSA 138.2 ✓ Ro5 ✓ Clean COc1cc(c(cc1NC(=O)CSc2ccc(cn2)C(=O)O)Cl)OC[C@H]…
1E7 RCSB PDB P13491 352.8 Da LogP 3.17 TPSA 88.5 ✓ Ro5 ✓ Clean COc1ccc(cc1NC(=O)CSc2ccc(cn2)C(=O)O)Cl
6P3 RCSB PDB P13491 199.2 Da LogP 2.45 TPSA 50.2 ✓ Ro5 ✓ Clean c1ccc(cc1)c2ccc(cn2)C(=O)O
6V0 RCSB PDB P13491 665.4 Da LogP -3.03 TPSA 317.6 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
APR RCSB PDB A0A143T1U9 559.3 Da LogP -3.28 TPSA 291.5 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
MLI RCSB PDB P13491 102.0 Da LogP -3.12 TPSA 80.3 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(=O)[O-]
OAA RCSB PDB A0A143T1U9 131.1 Da LogP -2.22 TPSA 94.5 ✓ Ro5 ✓ Clean C(C(=O)C(=O)O)C(=O)[O-]
PYR RCSB PDB P00343 88.1 Da LogP -0.34 TPSA 54.4 ✓ Ro5 ✓ Clean CC(=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.

Cross-references

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