KpKP13 Protein target profile

Methionine synthase

Accession: KP13_00354

Gene: metH AHE46907.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GKU6
Length 1227
Pocket druggability (P2Rank · AlphaFold DB model) 0.968
Direct ligand evidence 0 58 total records
Functional annotation 1 EC 11 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 (%)
57.447 Lower values reduce human off-target concern.
Human E-value
5.62e-29
Gut microbiome similarity
10.1% 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
91.64 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) 0.968
Structure A0A0H3GKU6
Pocket Pocket 1
Druggability (FPocket) 0.71
Structure A0A0H3GKU6
Pocket Pocket 1
ColabFold model
P2Rank 0.866 · Pocket 1
FPocket 0.614 · Pocket 4
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 481 / 4744 genomes with a hit
Prevalence 10.1%

Cross-references

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

Sequence

Primary amino-acid sequence viewer.

MSSKVEQLHQQLKERILVLDGGMGTMIQGYRLSEQDFRGERFADWPCDLKGNNDLLVLSKPEVIREIHDAYFEAGADIIETNTFNSTTIAMADYQMESLSAEINFAAAKLARASADAWTARTPEKPRYVAGVLGPTNRTASISPDVNDPAFRNITFDQLVAAYRESTRALVEGGVDLILIETVFDTLNAKAAIYAVKEELEALGVDLPLMISGTITDASGRTLSGQTTEAFYNSLRHAEALSFGLNCALGPDELRQYVQELSRIAECYVTAHPNAGLPNAFGEYDLDADTMATQIREWAEAGFLNIVGGCCGTTPEHIAAMSRAVAGLPPRQLPEIAVACRLAGLEPLNIGDDSLFVNVGERTNVTGSAKFKRLIKEEKYSEALDVARQQVESGAQIIDINMDEGMLDAEAAMVRFLNLIAGEPDIARVPIMIDSSKWEVIEKGLKCIQGKGIVNSISMKEGVESFIHHAKLVRRYGAAVVVMAFDEVGQADTRERKIEICRRAYKILTEEVGFPPEDIIFDPNIFAVATGIEEHNNYAQDFIGACEDIKRELPHALISGGVSNVSFSFRGNDPVREAIHAVFLYYAIRNGMDMGIVNAGQLAIYDDLPGELRDAVEDVILNRRDDSTERLLELAEKYRGSKADDGANAQQAEWRTWEVKKRLEYSLVKGITEFIEQDTEEARQQAARPIEVIEGPLMDGMNVVGDLFGEGKMFLPQVVKSARVMKQAVAYLEPFIEASKEQGSSNGKMVIATVKGDVHDIGKNIVGVVLQCNNYEIIDLGVMVPADKILKTAKEVNADLIGLSGLITPSLDEMVNVAKEMERQGFTIPLLIGGATTSKAHTAVKIEQNYSGPTVYVQNASRTVGVVSALLSDTQRDEFVARTRKEYETVRIQHGRKKPRTPPVTLAAARENDLAFDWESYTPPMAHRLGVQTVEASIETLRNYIDWTPFFMTWSLAGKYPRILEDEVVGEEAQRLFKDANELLDKLSAEKTLNPRGVVGLFPANRVGDDIEIYRDETRTHVLTVSHHLRQQTEKVGFANYCLADFVAPKLSGKADYIGAFAVTGGLEEDALADAYEAQHDDYNKIMIKAIADRLAEAFAEYLHEKVRKVYWGYAANENLSNEELIRENYQGIRPAPGYPACPEHTEKGTIWQLLDVEAHTGMKLTESFAMWPGASVSGWYFSHPDSKYFAVAQIQRDQVEDYALRKGMTPAEVERWLAPNLGYDAD

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 11 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

11
  • GO:0044237 OBSOLETE. The chemical reactions and pathways by which individual cells transform chemical substances.
  • GO:0008270 Binding to a zinc ion (Zn).
  • GO:0009086 OBSOLETE. The chemical reactions and pathways resulting in the de novo formation of L-methionine (2-amino-4-(methylthio)butanoic acid), a sulfur-containing, essential amino acid found in peptide linkage in proteins.
  • GO:0008705 Catalysis of the reaction: (6S)-5-methyl-5,6,7,8-tetrahydrofolate + L-homocysteine = (6S)-5,6,7,8-tetrahydrofolate + L-methionine.
  • GO:0031419 Binding to cobalamin (vitamin B12), a water-soluble vitamin characterized by possession of a corrin nucleus containing a cobalt atom.
  • GO:0046872 Binding to a metal ion.
  • GO:0042558 The chemical reactions and pathways involving any compound containing pteridine (pyrazino(2,3-dipyrimidine)), e.g. pteroic acid, xanthopterin and folic acid.
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0050667 The chemical reactions and pathways involving homocysteine, the amino acid alpha-amino-gamma-mercaptobutanoic acid. Homocysteine is an important intermediate in the metabolic reactions of its S-methyl derivative, methionine.
  • GO:0032259 The process in which a methyl group is covalently attached to a molecule.
  • GO:0046653 The chemical reactions and pathways involving tetrahydrofolate, 5,6,7,8-tetrahydrofolic acid, a folate derivative bearing additional hydrogens on the pterin group.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

56 records
Show feature table
Start End DB Term Name
657 740 SMART SM01018 B12_binding_2_2
657 740 InterPro IPR003759 Cobalamin (vitamin B12)-binding module, cap domain
744 895 FunFam G3DSA:3.40.50.280:FF:000001 Methionine synthase
653 739 SUPERFAMILY SSF47644 Methionine synthase domain
653 739 InterPro IPR036594 Methionine synthase domain
938 1208 Pfam PF02965 Vitamin B12 dependent methionine synthase, activation domain
938 1208 InterPro IPR004223 Vitamin B12-dependent methionine synthase, activation domain
346 643 Gene3D G3DSA:3.20.20.20 -
346 643 InterPro IPR011005 Dihydropteroate synthase-like
660 733 Pfam PF02607 B12 binding domain
660 733 InterPro IPR003759 Cobalamin (vitamin B12)-binding module, cap domain
903 1226 SUPERFAMILY SSF56507 Methionine synthase activation domain-like
903 1226 InterPro IPR037010 Vitamin B12-dependent methionine synthase, activation domain superfamily
96 116 Coils Coil Coil
742 894 SUPERFAMILY SSF52242 Cobalamin (vitamin B12)-binding domain
742 894 InterPro IPR036724 Cobalamin-binding domain superfamily
360 598 Pfam PF00809 Pterin binding enzyme
360 598 InterPro IPR000489 Pterin-binding domain
905 1224 Gene3D G3DSA:3.10.196.10 -
905 1224 InterPro IPR037010 Vitamin B12-dependent methionine synthase, activation domain superfamily
356 630 SUPERFAMILY SSF51717 Dihydropteroate synthetase-like
356 630 InterPro IPR011005 Dihydropteroate synthase-like
897 1227 ProSiteProfiles PS50974 AdoMet activation domain profile.
897 1227 InterPro IPR004223 Vitamin B12-dependent methionine synthase, activation domain
346 642 FunFam G3DSA:3.20.20.20:FF:000002 Methionine synthase
646 740 FunFam G3DSA:1.10.1240.10:FF:000001 Methionine synthase
356 612 CDD cd00740 MeTr
644 740 Gene3D G3DSA:1.10.1240.10 Methionine synthase domain
644 740 InterPro IPR036594 Methionine synthase domain
744 895 Gene3D G3DSA:3.40.50.280 -
746 881 ProSiteProfiles PS51332 B12-binding domain profile.
746 881 InterPro IPR006158 Cobalamin (vitamin B12)-binding domain
748 840 Pfam PF02310 B12 binding domain
748 840 InterPro IPR006158 Cobalamin (vitamin B12)-binding domain
6 1224 PANTHER PTHR45833 METHIONINE SYNTHASE
1 1195 PIRSF PIRSF000381 Met_synth_MetH
1 1195 InterPro IPR011822 Cobalamin-dependent methionine synthase
659 871 CDD cd02069 methionine_synthase_B12_BD
659 871 InterPro IPR033706 Methionine synthase, B12-binding domain
936 1093 Gene3D G3DSA:1.10.288.10 -
2 338 FunFam G3DSA:3.20.20.330:FF:000001 Methionine synthase
1 340 Gene3D G3DSA:3.20.20.330 -
1 340 InterPro IPR036589 Homocysteine-binding domain superfamily
7 399 SUPERFAMILY SSF82282 Homocysteine S-methyltransferase
7 399 InterPro IPR036589 Homocysteine-binding domain superfamily
650 744 ProSiteProfiles PS51337 B12-binding N-terminal domain profile.
650 744 InterPro IPR003759 Cobalamin (vitamin B12)-binding module, cap domain
970 990 Coils Coil Coil
356 617 ProSiteProfiles PS50972 Pterin-binding domain profile.
356 617 InterPro IPR000489 Pterin-binding domain
17 325 Pfam PF02574 Homocysteine S-methyltransferase
17 325 InterPro IPR003726 Homocysteine-binding domain
12 1192 NCBIfam TIGR02082 methionine synthase
12 1192 InterPro IPR011822 Cobalamin-dependent methionine synthase
5 325 ProSiteProfiles PS50970 Homocysteine-binding domain profile.
5 325 InterPro IPR003726 Homocysteine-binding 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.

Download VMD script Full viewer

Loading 3D structure...

Drag to rotate — click the view, then scroll to zoom.

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
0.968
Show in viewer
Surrounding area
Pocket 2 P2Rank #2
0.878
Show in viewer
Surrounding area
Pocket 3 P2Rank #3
0.699
Show in viewer
Surrounding area
Pocket 4 P2Rank #4
0.305
Show in viewer
Surrounding area
Pocket 5 P2Rank #5
0.099
Show in viewer
Surrounding area

Binding pockets · FPocket

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

Pocket 1 FPocket #1
0.71
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:1134-1134
UniProt: Binding site:1189-1190
UniProt: Binding site:247-247
UniProt: Binding site:310-310
UniProt: Binding site:311-311
UniProt: Binding site:694-694
UniProt: Binding site:756-760
UniProt: Binding site:759-759 axial binding residue
UniProt: Binding site:804-804
UniProt: Binding site:808-808
UniProt: Binding site:860-860
UniProt: Binding site:946-946
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_A0A0H3GKU6
AlphaFold DB full sequence Viewing
ColabFold KP13_00354
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.

58 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 8 records from similar proteins
Structural ligands 8 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
B13 PDB via homolog 1321.3 Da · LogP 1.51 · TPSA 444.1 Open detail RCSB PDB
C2F PDB via homolog Detail RCSB PDB
COB PDB via homolog Detail RCSB PDB
FLC PDB via homolog Detail RCSB PDB
HCS 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
B13 RCSB PDB Q46EH4 1321.3 Da LogP 1.51 TPSA 444.1 3 viol. ✓ Clean CC1=C2[C@@]([C@@H](C3=CC4C([C@@H](C5=C(C6[C@]([…
C2F RCSB PDB Q5SKM5 459.5 Da LogP -0.26 TPSA 202.8 1 viol. ✓ Clean C[N@@]1[C@H](CNC2=C1C(=O)NC(=N2)N)CNc3ccc(cc3)C…
COB RCSB PDB P13009 Cc1cc2c(cc1C)n(cn2)[C@@H]3[C@@H]([C@@H]([C@H](O…
FLC RCSB PDB Q5SKM5 189.1 Da LogP -5.25 TPSA 140.6 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O
HCS RCSB PDB Q9WYA5 135.2 Da LogP -0.28 TPSA 63.3 ✓ Ro5 ✓ Clean C(CS)[C@@H](C(=O)O)N
SFG RCSB PDB P13009 381.4 Da LogP -2.06 TPSA 208.7 2 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
THG RCSB PDB Q99707 445.4 Da LogP -0.28 TPSA 211.6 1 viol. ✓ Clean c1cc(ccc1C(=O)N[C@@H](CCC(=O)O)C(=O)O)NC[C@H]2C…
YT3 RCSB PDB Q9WYA5 88.9 Da LogP -0.00 TPSA 0.0 ✓ Ro5 ✓ Clean [Y+3]

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.