Finding step nagEIIA for N-acetyl-D-glucosamine catabolism in Actinomyces timonensis 7400942
5 candidates for nagEIIA: N-acetylglucosamine phosphotransferase system, EII-A component (PtsG/YpqE/GamP)
Score | Gene | Description | Similar to | Id. | Cov. | Bits | Other hit | Other id. | Other bits |
med | A1QA_RS14145 | PTS beta-glucoside transporter subunit IIBCA | Putative phosphotransferase enzyme IIA component YpqE (characterized, see rationale) | 42% | 92% | 133.7 | The sucrose porter, PtsS (regulated by SugR which also regulates other enzymes II) | 52% | 657.9 |
med | A1QA_RS0108255 | PTS transporter subunit EIIC | Putative phosphotransferase enzyme IIA component YpqE (characterized, see rationale) | 44% | 92% | 119 | protein-Npi-phosphohistidine-D-mannose phosphotransferase (EC 2.7.1.191); protein-Npi-phosphohistidine-D-glucose phosphotransferase (EC 2.7.1.199) | 46% | 582.0 |
lo | A1QA_RS0112420 | PTS transporter subunit EIIC | Putative PTS system glucosamine-specific EIICBA component; EC 2.7.1.193 (characterized) | 45% | 60% | 323.6 | IIC' aka PtsC2, component of N-Acetylglucosamine (NAG) porter (PtsBC1C2)(also may facilitate xylose transport) | 49% | 389.4 |
lo | A1QA_RS0108840 | PTS transporter subunit EIIC | Putative phosphotransferase enzyme IIA component YpqE (characterized, see rationale) | 39% | 85% | 123.2 | PTS beta-glucoside transporter, EIIBCA of 672 aas and 12 predicted TMSs | 42% | 500.7 |
lo | A1QA_RS0112400 | PTS glucose transporter subunit IIA | Putative phosphotransferase enzyme IIA component YpqE (characterized, see rationale) | 36% | 85% | 98.2 | D-trehalose PTS system, I, HPr, and IIA components | 37% | 102.1 |
Confidence: high confidence medium confidence low confidence
transporter – transporters and PTS systems are shaded because predicting their specificity is particularly challenging.
GapMind searches the predicted proteins for candidates by using ublast (a fast alternative to protein BLAST) to find similarities to characterized proteins or by using HMMer to find similarities to enzyme models (usually from TIGRFams). For alignments to characterized proteins (from ublast), scores of 44 bits correspond to an expectation value (E) of about 0.001.
Definition of step nagEIIA
- Curated sequence P20166: PTS system glucose-specific EIICBA component; EC 2.7.1.-; EC 2.7.1.69. The glucose IICBA porter (PtsG) 44% identical to 4.A.1.1.1)
- UniProt sequence P50829: RecName: Full=Putative phosphotransferase enzyme IIA component YpqE; AltName: Full=Putative PTS system EIIA component;
- Curated sequence P39816: Putative PTS system glucosamine-specific EIICBA component; EC 2.7.1.193. The glucosamine IICBA porter (GamP) (40% identical to 4.A.1.1.2) (Plumbridge 2015). The IIA domain in this protein can transfer the phosphoryl moiety to the maltose, N-acetylglucosamine, sucrose and trehalose PTS systems (MalP, NagP, SacP and TreP, respectively)
- Comment: Bacillus subtilis has EII-CB, known as nagP. The major EII-A is ptsG (P20166, see PMID:30038046), which is a bit surprising as ptsG has EII-B and EII-C domains as well and is thought to be specific for glucose; YpqE (P50829) or GamP (P39816) also suffice. (YpqE has EII-A only, while GamP is the EII-CBA protein for glucosamine)
Or cluster all characterized nagEIIA proteins
This GapMind analysis is from Sep 24 2021. The underlying query database was built on Sep 17 2021.
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About GapMind
Each pathway is defined by a set of rules based on individual steps or genes. Candidates for each step are identified by using
ublast (a fast alternative to protein BLAST)
against a database of manually-curated proteins (most of which are experimentally characterized) or by using
HMMer with enzyme models (usually from
TIGRFam). Ublast hits may be split across two different proteins.
A candidate for a step is "high confidence" if either:
- ublast finds a hit to a characterized protein at above 40% identity and 80% coverage, and bits >= other bits+10.
- (Hits to curated proteins without experimental data as to their function are never considered high confidence.)
- HMMer finds a hit with 80% coverage of the model, and either other identity < 40 or other coverage < 0.75.
where "other" refers to the best ublast hit to a sequence that is not annotated as performing this step (and is not "ignored").
Otherwise, a candidate is "medium confidence" if either:
- ublast finds a hit at above 40% identity and 70% coverage (ignoring otherBits).
- ublast finds a hit at above 30% identity and 80% coverage, and bits >= other bits.
- HMMer finds a hit (regardless of coverage or other bits).
Other blast hits with at least 50% coverage are "low confidence."
Steps with no high- or medium-confidence candidates may be considered "gaps."
For the typical bacterium that can make all 20 amino acids, there are 1-2 gaps in amino acid biosynthesis pathways.
For diverse bacteria and archaea that can utilize a carbon source, there is a complete
high-confidence catabolic pathway (including a transporter) just 38% of the time, and
there is a complete medium-confidence pathway 63% of the time.
Gaps may be due to:
- our ignorance of proteins' functions,
- omissions in the gene models,
- frame-shift errors in the genome sequence, or
- the organism lacks the pathway.
GapMind relies on the predicted proteins in the genome and does not search the six-frame translation. In most cases, you can search the six-frame translation by clicking on links to Curated BLAST for each step definition (in the per-step page).
For more information, see:
If you notice any errors or omissions in the step descriptions, or any questionable results, please let us know
by Morgan Price, Arkin group, Lawrence Berkeley National Laboratory