Protein target profile

VK055_5121

amino acid adenylation domain protein

Genome: KpATCC43816 Gene: irp2 AIK83647.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3H0D3
Length 2035
Pocket druggability 0.976
Direct ligand evidence 0 66 total records
Functional annotation 0 EC 6 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 (%)
35.443 Lower values reduce human off-target concern.
Human E-value
7.51e-07
Gut microbiome similarity
0.1% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Localization

Localization
CytoplasmicMembrane

Structure confidence

ColabFold pLDDT
84.57 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

The selected pocket score is the FPocket value used for ranking after applying the curated structure priority. It estimates small-molecule pocket quality; it is not experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

FPocket 0.976
Structure A0A0H3H0D3
Pocket Pocket 121
P2Rank 0.986
Structure A0A0H3H0D3
Pocket Pocket 1
ColabFold model
FPocket 0.999 · Pocket 10
P2Rank 0.983 · Pocket 1
Core conservation Accessory gene
Roary accessory
CoreCruncher accessory
Gut microbiome 4 / 4744 genomes with a hit
Prevalence 0.1%

Cross-references

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

Sequence

Primary amino-acid sequence viewer.

MISGAPSQDSLLPDNRHAADYQQLRERLIQELNLTPQQLHEESNLIQAGLDSIRLMRWLHWFRKNGYRLTLRELYAAPTLAAWNQLMLSRSPENAEEETPPDESSWPNMTERTPFPLTPVQHAYLTGRMPGQTLGGVGCHLYQEFEGHCLTASQLEQAITTLLQRHPMLHIAFRPDGQQVWLPQPYWNGVTVHDLRHNDAESRQAYLDALRQRLSHRLLRVEIGETFDFQLTLLPDNRHRLHVNIDLLIMDASSFTLFFDELNALLAGESLPAIDTRYDFRSYLLHQQKINQPLRDDARAYWLAKASTLPPAPVLPLACEPATLREVRNTRRRMIVPATRWHAFSNRAGEYGVTPTMALATCFSAVLARWGGLTRLLLNITLFDRQPLHPAVGAMLADFTNILLLDTACDGDTVSNLARKNQLTFTEDWEHRHWSGVELLRELKRQQRYPHGAPVVFTSNLGRSLYSSRAESPLGEPEWGISQTPQVWIDHLAFEHHGEVWLQWDSNDALFPPALVETLFDAYCQLINQLCDDESAWQKPFADMMPASQRAIRERVNATGAPIPEGLLHEGIFRIALQQPQALAVTDMRYQWNYHELTDYARRCAGRLIECGVQPGDNVAITMSKGAGQLVAVLAVLLAGAVYVPVSLDQPAARREKIYADASVRLVLICQHDASAGSDDIPVLAWQQAIEAEPIANPVVRAPTQPAYIIYTSGSTGTPKGVVISHRGALNTCCDINTRYQVGPHDRVLALSALHFDLSVYDIFGVLRAGGALVMVMENQRRDPHAWCELIQRHQVTLWNSVPALFDMLLTWCEGFADATPENLRAVMLSGDWIGLDLPARYRAFRPQGQFIAMGGATEASIWSNACEIHDVPAHWRSIPYGFPLTNQRYRVVDEQGRDCPDWVPGELWIGGIGVAEGYFNDPLRSEQQFLTLPDERWYRTGDLGCYWPDGTIEFLGRRDKQVKVGGYRIELGEIESALSQLAGVKQATVLAIGEKEKTLAAYVVPQGEAFCVTDHRNPALPQAWHTLAGTLPCCAISPEISAEQVADFLQHRLLKLKPGHTAGADPLPLMNSLAIQPRWQAVVERWLAFLVTQRRLKPAAEGYQVCAGEEREDEHPHFSGHDLTLSQILRGARNELSLLNDAQWSPESLAFNHPASAPYIQELATICQQLAQRLQRPIRLLEVGTRTGRAAESLLAQLNAGQIEYVGLEQSQEMLLSARQRLAPWPGTRLSLWNADTLAAHAHSADIIWLNNALHRLLPEDPGLLATLQQLAVPGALLYVMEFRQLTPPALLSTLLLTNGQPEALLHNSADWAALFSAAAFNCQHGDEVAGLQRFLVQCPDRQVRRDPRQLQAALAGRLPGWMVPQRIVFLDALPLTANGKIDYQALKRRHTPEAENPAEADLPQGDIEKQVAALWQQLLSTGNVTRETDFFQQGGDSLLATRLTGQLHQAGYEAQLSDLFNHPRLADFAATLRKTDVPVEQPFVHSPEDRYQPFALTDVQQAYLVGRQPGFALGGVGSHFFVEFEIADLDLTRLETVWNRLIARHDMLRAIVRDGQQQVLEQTPPWVIPAHTLHTPEEALRVREKLAHQVLNPEVWPVFDLQVGYVDGMPARLWLCLDNLLLDGLSMQILLAELEHGYRYPQQLLPPLPVTFRDYLQQPSLQSPNPDSLAWWQAQLDDIPPAPALPLRCLPQEVETPRFARLNGALDSTRWHRLKKRAADAHLTPSAVLLSVWSTVLSAWSAQPEFTLNLTLFDRRPLHPQINQILGDFTSLMLLSWHPGESWLHSAQSLQQRLSQNLNHRDVSAIRVMRQLAQRQNVPAVPMPVVFTSALGFEQDNFLARRNLLKPVWGISQTPQVWLDHQIYESEGELRFNWDFVAALFPVGQVERQFEQYCALLNRMAEDESGWQLPLAALVPPVKHAGQCAERSPRVCPEQSQPHIAADESTVSLICDAFREVVGESVTPAENFFEAGATSLNLVQLHVLLQRHEFSTLTLLDLFTHPSPAALADYLAGVATVEKTKRPRPVRRRQRRI

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Gene Ontology (GO)

6
  • 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:0031177 Binding to phosphopantetheine, the vitamin pantetheine 4'-(dihydrogen phosphate).
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
  • GO:0016877 Catalysis of the joining of two molecules via a carbon-sulfur bond, with the concomitant hydrolysis of the diphosphate bond in ATP or a similar triphosphate.
  • GO:0043041 Activation of an amino acid for incorporation into a peptide by a nonribosomal process.
  • GO:0009403 The chemical reactions and pathways resulting in the formation of toxin, a poisonous compound (typically a protein) that is produced by cells or organisms and that can cause disease when introduced into the body or tissues of an organism.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

72 records
Show feature table
Start End DB Term Name
568 958 Gene3D G3DSA:3.40.50.12780 -
568 958 InterPro IPR042099 ANL, N-terminal domain
1148 1306 Gene3D G3DSA:3.40.50.150 Vaccinia Virus protein VP39
1148 1306 InterPro IPR029063 S-adenosyl-L-methionine-dependent methyltransferase superfamily
1667 1909 FunFam G3DSA:3.30.559.30:FF:000006 Yersiniabactin polyketide/non-ribosomal peptide synthetase
296 536 SUPERFAMILY SSF52777 CoA-dependent acyltransferases
1398 1480 Gene3D G3DSA:1.10.1200.10 -
1398 1480 InterPro IPR036736 ACP-like superfamily
1164 1322 SUPERFAMILY SSF53335 S-adenosyl-L-methionine-dependent methyltransferases
1164 1322 InterPro IPR029063 S-adenosyl-L-methionine-dependent methyltransferase superfamily
1490 1661 FunFam G3DSA:3.30.559.10:FF:000023 Non-ribosomal peptide synthetase
549 1422 SUPERFAMILY SSF56801 Acetyl-CoA synthetase-like
1410 1478 SMART SM00823 Phosphopantetheine attachment site
1410 1478 InterPro IPR020806 Polyketide synthase, phosphopantetheine-binding domain
1949 2017 SMART SM00823 Phosphopantetheine attachment site
1949 2017 InterPro IPR020806 Polyketide synthase, phosphopantetheine-binding domain
1180 1282 CDD cd02440 AdoMet_MTases
1405 1475 SUPERFAMILY SSF47336 ACP-like
1405 1475 InterPro IPR036736 ACP-like superfamily
1941 2024 Gene3D G3DSA:1.10.1200.10 -
1941 2024 InterPro IPR036736 ACP-like superfamily
114 534 CDD cd19535 Cyc_NRPS
1490 1661 Gene3D G3DSA:3.30.559.10 -
1490 1661 InterPro IPR023213 Chloramphenicol acetyltransferase-like domain superfamily
110 291 Gene3D G3DSA:3.30.559.10 -
110 291 InterPro IPR023213 Chloramphenicol acetyltransferase-like domain superfamily
109 287 FunFam G3DSA:3.30.559.10:FF:000023 Non-ribosomal peptide synthetase
117 289 SUPERFAMILY SSF52777 CoA-dependent acyltransferases
1495 1906 CDD cd19535 Cyc_NRPS
1705 1908 PANTHER PTHR45527 NONRIBOSOMAL PEPTIDE SYNTHETASE
1669 1908 Gene3D G3DSA:3.30.559.30 Nonribosomal peptide synthetase, condensation domain
296 539 Gene3D G3DSA:3.30.559.30 Nonribosomal peptide synthetase, condensation domain
1943 2017 ProSiteProfiles PS50075 Carrier protein (CP) domain profile.
1943 2017 InterPro IPR009081 Phosphopantetheine binding ACP domain
150 535 Pfam PF00668 Condensation domain
150 535 InterPro IPR001242 Condensation domain
1530 1905 Pfam PF00668 Condensation domain
1530 1905 InterPro IPR001242 Condensation domain
13 93 Gene3D G3DSA:1.10.1200.10 -
13 93 InterPro IPR036736 ACP-like superfamily
960 1056 Gene3D G3DSA:3.30.300.30 -
960 1056 InterPro IPR045851 AMP-binding enzyme, C-terminal domain superfamily
1952 2013 Pfam PF00550 Phosphopantetheine attachment site
1952 2013 InterPro IPR009081 Phosphopantetheine binding ACP domain
1412 1473 Pfam PF00550 Phosphopantetheine attachment site
1412 1473 InterPro IPR009081 Phosphopantetheine binding ACP domain
22 82 Pfam PF00550 Phosphopantetheine attachment site
22 82 InterPro IPR009081 Phosphopantetheine binding ACP domain
709 720 ProSitePatterns PS00455 Putative AMP-binding domain signature.
709 720 InterPro IPR020845 AMP-binding, conserved site
47 62 ProSitePatterns PS00012 Phosphopantetheine attachment site.
47 62 InterPro IPR006162 Phosphopantetheine attachment site
1946 2014 SUPERFAMILY SSF47336 ACP-like
1946 2014 InterPro IPR036736 ACP-like superfamily
1489 1680 SUPERFAMILY SSF52777 CoA-dependent acyltransferases
575 965 Pfam PF00501 AMP-binding enzyme
575 965 InterPro IPR000873 AMP-dependent synthetase/ligase domain
15 91 ProSiteProfiles PS50075 Carrier protein (CP) domain profile.
15 91 InterPro IPR009081 Phosphopantetheine binding ACP domain
566 959 FunFam G3DSA:3.40.50.12780:FF:000012 Non-ribosomal peptide synthetase
594 990 NCBIfam TIGR01733 amino acid adenylation domain
594 990 InterPro IPR010071 Amino acid adenylation domain
1404 1478 ProSiteProfiles PS50075 Carrier protein (CP) domain profile.
1404 1478 InterPro IPR009081 Phosphopantetheine binding ACP domain
580 1063 CDD cd12114 A_NRPS_TlmIV_like
1182 1279 Pfam PF08242 Methyltransferase domain
1182 1279 InterPro IPR013217 Methyltransferase type 12
1307 1397 Gene3D G3DSA:3.30.300.30 -
1307 1397 InterPro IPR045851 AMP-binding enzyme, C-terminal domain superfamily
1669 1908 SUPERFAMILY SSF52777 CoA-dependent acyltransferases
21 124 SUPERFAMILY SSF47336 ACP-like
21 124 InterPro IPR036736 ACP-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 · FPocket

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

Site 1 FPocket #121
0.976
Unusual size
Show in viewer
Surrounding area
Site 2 FPocket #18
0.958
Likely same site as P2Rank 1 6.9 Å 25 shared residues 100% of smaller site
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Surrounding area
Site 3 FPocket #68
0.923
Likely same site as P2Rank 3 2.7 Å 35 shared residues 97% of smaller site
Unusual size
Show in viewer
Surrounding area
Site 4 FPocket #1
0.908
Likely same site as P2Rank 2 8.0 Å 29 shared residues 62% of smaller site
Unusual size
Show in viewer
Surrounding area

Binding pockets · P2Rank

Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Site 1 P2Rank #1
0.986
Likely same site as FPocket 18 6.9 Å 25 shared residues 100% of smaller site
Show in viewer
Surrounding area
Site 2 P2Rank #2
0.974
Likely same site as FPocket 1 8.0 Å 29 shared residues 62% of smaller site
Show in viewer
Surrounding area
Site 3 P2Rank #3
0.939
Likely same site as FPocket 68 2.7 Å 35 shared residues 97% of smaller site
Show in viewer
Surrounding area
Site 4 P2Rank #4
0.779
Show in viewer
Surrounding area
Site 5 P2Rank #5
0.718
Show in viewer
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_A0A0H3H0D3
AlphaFold DB full sequence Viewing
ColabFold VK055_5121
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.

66 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 16 records from similar proteins
Structural ligands 15 0 loaded crystals
Measured bioactivity 1 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
5FQ PDB via homolog 158.2 Da · LogP 0.64 · TPSA 55.1 Open detail RCSB PDB
5S4 PDB via homolog Detail RCSB PDB
9EF PDB via homolog Detail RCSB PDB
AKR PDB via homolog Detail RCSB PDB
ANP 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
5FQ RCSB PDB Q9Z4X6 158.2 Da LogP 0.64 TPSA 55.1 ✓ Ro5 ✓ Clean CCCCCNC(=O)[C@H](C)N
5S4 RCSB PDB Q70LM7 440.4 Da LogP -1.80 TPSA 200.3 1 viol. ✓ Clean CC(C)[C@@H](C(=O)NCCNC(=O)CCNC(=O)[C@@H](C(C)(C…
9EF RCSB PDB Q70LM7 383.3 Da LogP -1.76 TPSA 174.3 1 viol. ✓ Clean CC(=O)NCCNC(=O)CCNC(=O)[C@@H](C(C)(C)COP(=O)(O)…
AKR RCSB PDB A0A077JG85 72.1 Da LogP 0.26 TPSA 37.3 ✓ Ro5 ✓ Clean C=CC(=O)O
ANP RCSB PDB A0A077JG85 506.2 Da LogP -2.06 TPSA 281.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
APC RCSB PDB Q70LM7 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)…
B6G RCSB PDB Q333U7 432.3 Da LogP -1.37 TPSA 218.2 1 viol. ✓ Clean CC(C)[C@@H](C(=O)OP(=O)(O)O[C@H]1[C@H]([C@H]([C…
CO8 RCSB PDB E5ATN9 893.7 Da LogP 1.03 TPSA 363.6 3 viol. ✓ Clean CCCCCCCC(=O)SCCNC(=O)CCNC(=O)[C@@H](C(C)(C)CO[P…
DG9 RCSB PDB Q70LM7 785.8 Da LogP -2.85 TPSA 336.7 3 viol. ✓ Clean CC(C)[C@H]([C@H](CS(=O)(=O)NC[C@@H]1[C@H]([C@H]…
FGU RCSB PDB E5ATN9 232.3 Da LogP 0.76 TPSA 72.2 ✓ Ro5 ✓ Clean CC(C)C[C@@H](C(=O)SCCNC(=O)C)N
FON RCSB PDB Q70LM7 473.4 Da LogP -0.73 TPSA 219.8 1 viol. ✓ Clean c1cc(ccc1C(=O)N[C@@H](CCC(=O)O)C(=O)O)NC[C@@H]2…
JQG RCSB PDB Q70LM7 468.4 Da LogP -1.84 TPSA 200.2 1 viol. ✓ Clean CC(C)[C@@H](C(=O)NCCNC(=O)CCNC(=O)[C@@H](C(C)(C…
KIV RCSB PDB Q70LM7 116.1 Da LogP 0.30 TPSA 54.4 ✓ Ro5 ✓ Clean CC(C)C(=O)C(=O)O
PNS RCSB PDB Q70LM7 358.4 Da LogP -0.96 TPSA 145.2 1 viol. ✓ Clean CC(C)(COP(=O)(O)O)[C@H](C(=O)NCCC(=O)NCCS)O
UM2 RCSB PDB Q9Z4X6 144.2 Da LogP 0.25 TPSA 55.1 ✓ Ro5 ✓ Clean CCCCNC(=O)[C@H](C)N

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.