PTS system N,N'-diacetylchitobiose-specific EIIA component (chbA) is a 116-residue protein from Escherichia coli (strain K12). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P69791.
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The mean pLDDT of this model is 88.5 (confident overall). pLDDT is AlphaFold's per-residue confidence score from 0 to 100. In MolViewer, choose the B-factor color scheme to color the model by pLDDT, because AlphaFold stores it in the B-factor column.
| pLDDT band | Meaning | Share of residues |
|---|---|---|
| Above 90 | Very high: backbone and side chains are usually accurate | 69% |
| 70 to 90 | Confident: backbone generally right | 19% |
| 50 to 70 | Low: treat with caution | 10% |
| Below 50 | Very low: often disordered regions | 3% |
What pLDDT means and how to read it
The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. The enzyme II ChbABC PTS system is involved in the transport of the chitin disaccharide N,N'-diacetylchitobiose (GlcNAc2) (PubMed:10913117, PubMed:10913118). Also able to use N,N',N''-triacetyl chitotriose (GlcNAc3) (PubMed:10913117)
Forms a complex with ChbB (EIIB) (PubMed:10913119, PubMed:10913122, PubMed:19959833). ChbA is a homotrimer (PubMed:10913122, PubMed:15654077, PubMed:19959833, PubMed:22593574). The interface of the homotrimer is stabilized by metal cations such as magnesium, copper or nickel (PubMed:15654077)
Cytoplasm
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 1WCR | NMR | A/B/C=14-116 | |
| 2LRK | NMR | A/B/C=14-116 | |
| 2LRL | NMR | A/B/C=14-116 | |
| 2WWV | NMR | A/B/C=14-116 | |
| 2WY2 | NMR | A/B/C=14-116 |
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