Protein target profile

PA4896

RNA polymerase sigma factor

Genome: NC_002516.2

Gene: PA4896 3D evidence: AlphaFold DB model UniProt Q9HUR7
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Length 178
Pocket druggability 0.715
EC / GO 0 / 7
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

4 signals

Strengths

No similar human protein detected The current BLAST sequence screen did not find a significant human match, lowering apparent off-target risk. Strong predicted binding pocket FPocket selected-pocket score 0.71. This is a computational pocket signal, not binding validation. Structure available AlphaFold DB model

Risks / watch

No major risk signal surfaced in the loaded evidence.

Missing evidence

No metabolic context No SBML/network-derived reaction evidence is loaded for this protein. No ligand evidence No experimental PDB ligands, measured ChEMBL bioactivity, or proposed ZINC compound records are available.
How to read 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 TPW 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.

Overview

Basic information about this protein and its source genome.

Accession
PA4896
Assembly
Pseudomonas aeruginosa PAO1, complete genome
Gene
PA4896
Status
annotated
Amino acids
178
3D evidence
AlphaFold DB model
GO
GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes. GO:0003677 Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid). GO:0016987 Sigma factors act as the promoter specificity subunit of eubacterial and plant plastid multisubunit RNA polymerases, whose core subunit composition is often described as alpha(2)-beta-beta-prime. Although sigma does not bind DNA on its own, when combined with the core to form the holoenzyme, the sigma factor binds specifically to promoter elements. The sigma subunit is released once elongation begins. GO:0006352 The initial step of transcription, consisting of the assembly of the RNA polymerase preinitiation complex (PIC) at a gene promoter, as well as the formation of the first few bonds of the RNA transcript. Transcription initiation includes abortive initiation events, which occur when the first few nucleotides are repeatedly synthesized and then released, and ends when promoter clearance takes place. GO:0006355 Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription. GO:0034756 Any process that modulates the frequency, rate or extent of the directed movement of iron ions (Fe) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.

Target profile

Computed evidence for target prioritization.

Human off-target
No hit
Gut microbiome off-target
Hit
Essential (DEG)
Y
Localization
Cytoplasmic

Selected pocket evidence

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 0.715
Structure –
Pocket –

Sequence

Primary amino-acid sequence viewer.

MNAPSSCLSADRDGVATLYRENHAWLRNWLAYRLRSWGRGVADDLAHDTFLRILASRDGGQREAIRQPRAYLTRIANCVLVSWRRRQSLELAWLEALATLPEPLQPSPEQQSVIVETLHEIDALLDTLRPRVKQAFLMATLDGMKQKDIAQALGVALPTVKKFIHQAYVTCLSLMPDE

Functional Annotations

Enzyme classification and Gene Ontology terms linked to this protein.

7 GO

Gene Ontology (GO)

7
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0003677 Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
  • GO:0016987 Sigma factors act as the promoter specificity subunit of eubacterial and plant plastid multisubunit RNA polymerases, whose core subunit composition is often described as alpha(2)-beta-beta-prime. Although sigma does not bind DNA on its own, when combined with the core to form the holoenzyme, the sigma factor binds specifically to promoter elements. The sigma subunit is released once elongation begins.
  • GO:0006352 The initial step of transcription, consisting of the assembly of the RNA polymerase preinitiation complex (PIC) at a gene promoter, as well as the formation of the first few bonds of the RNA transcript. Transcription initiation includes abortive initiation events, which occur when the first few nucleotides are repeatedly synthesized and then released, and ends when promoter clearance takes place.
  • GO:0006355 Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
  • GO:0034756 Any process that modulates the frequency, rate or extent of the directed movement of iron ions (Fe) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
  • GO:0003700 A transcription regulator activity that modulates transcription of gene sets via selective and non-covalent binding to a specific double-stranded genomic DNA sequence (sometimes referred to as a motif) within a cis-regulatory region. Regulatory regions include promoters (proximal and distal) and enhancers. Genes are transcriptional units, and include bacterial operons.

Sequence Features

Domain/signature hits from InterPro and related databases.

16 records
Show feature table
Start End DB Term Name
119 170 Pfam PF08281 Sigma-70, region 4
119 170 InterPro IPR013249 RNA polymerase sigma factor 70, region 4 type 2
18 88 Pfam PF04542 Sigma-70 region 2
18 88 InterPro IPR007627 RNA polymerase sigma-70 region 2
114 175 SUPERFAMILY SSF88659 Sigma3 and sigma4 domains of RNA polymerase sigma factors
114 175 InterPro IPR013324 RNA polymerase sigma factor, region 3/4-like
5 167 PANTHER PTHR43133 RNA POLYMERASE ECF-TYPE SIGMA FACTO
5 167 InterPro IPR039425 RNA polymerase sigma-70 like
16 168 NCBIfam TIGR02937 sigma-70 family RNA polymerase sigma factor
16 168 InterPro IPR014284 RNA polymerase sigma-70 like domain
4 85 Gene3D G3DSA:1.10.1740.10 -
8 108 SUPERFAMILY SSF88946 Sigma2 domain of RNA polymerase sigma factors
8 108 InterPro IPR013325 RNA polymerase sigma factor, region 2
86 175 Gene3D G3DSA:1.10.10.10 -
86 175 InterPro IPR036388 Winged helix-like DNA-binding domain superfamily
86 175 FunFam G3DSA:1.10.10.10:FF:000427 RNA polymerase sigma factor

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.

3D visualization script Full viewer

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Structural evidence

0 + 1

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 PA4896
AlphaFold DB — — full sequence — Viewing
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 #3
0.715
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Site 2 FPocket #4
0.493
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