Finding step aroP for L-tryptophan catabolism in Collimonas arenae Ter10
No candidates for aroP: tryptophan:H+ symporter AroP
GapMind classifies a step as low confidence even if it does not find any candidates. You can still try to find candidates by using Curated BLAST (which searches the 6-frame translation) or by text search of the annotations (which may indicate weak homology, under 30% identity or 50% coverage, that GapMind does not consider). See the links below.
Definition of step aroP
- Curated sequence P15993: Aromatic amino acid:H+ symporter, AroP of 457 aas and 12 TMSs (Cosgriff and Pittard 1997). Transports phenylalanine, tyrosine and tryptophan. aromatic amino acid:H+ symporter AroP. aromatic amino acid:H+ symporter AroP
- Curated sequence F2HN33: Transporter for phenylalainine, tyrosine and tryptophan of 449 aas and 12 TMSs, FywP or YsjA
- Curated sequence Q2VQZ4: Arbuscular mycorrhizal fungal proline:H+ symporter, AAP1 (binds and probably transports nonpolar, hydrophobic amino acids)
- Curated sequence Q46065: Aromatic amino acid permease, AroP
- UniProt sequence A0A0N9WG97: SubName: Full=Amino acid permease {ECO:0000313|EMBL:ALI00611.1};
- UniProt sequence Q4KIP0: SubName: Full=Aromatic amino acid transport protein AroP {ECO:0000313|EMBL:AAY96158.1};
- Ignore hits to A2RMP5 when looking for 'other' hits (Aromatic amino acid permease FywP)
- Ignore hits to AO356_18530 when looking for 'other' hits (L-tyrosine transporter)
- Comment: AO353_05930 (A0A0N9WG97) from Pseudomonas fluorescens FW300-N2E3 is related to aroP and is specifically improtant for tryptophan utilization (although more so if Trp is the nitrogen source). PfGW456L13_4291 (A0A293QSB2) from P. fluorescens GW4560-L13 is related to aroP and is specifically important for tryptophan utilization. Unfortunately A0A293QSB2 is no longer in UniProt; the closest remaining sequence is Q4KIP0 (only 87% identical). FywP (A2RMP5) may well be a tryptophan transporter as well, so ignore.
Or cluster all characterized aroP 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