Finding step argT for L-lysine catabolism in Haloterrigena daqingensis JX313
No candidates for argT: L-lysine ABC transporter, substrate-binding component ArgT
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 argT
- Curated sequence CH_003045: lysine/arginine/ornithine ABC transporter, periplasmic lysine/arginine/ornithine-binding protein ArgT. Lysine/arginine/ornithine-binding periplasmic protein; LAO-binding protein
- Curated sequence P09551: ArgT aka B2310, component of Histidine/Arginine/Lysine (basic amino acid) uptake porter, HisJ/ArgT/HisP/HisM/HisQ [R, R, C, M, M, respectively] (Gilson et al. 1982). HisJ binds L-His (preferred), but 1-methyl-L-His and 3-methyl-L-His also bind, while the dipeptide carnosine binds weakly; D-histidine and the histidine degradation products, histamine, urocanic acid and imidazole do not bind. L-Arg, homo-L-Arg, and post-translationally modified methylated Arg-analogs also bind with the exception of symmetric dimethylated-L-Arg. L-Lys and L-Orn show weaker interactions with HisJ and methylated and acetylated Lys variants show poor binding.The carboxylate groups of these amino acids and their variants are essential. lysine/arginine/ornithine ABC transporter periplasmic binding protein (EC 7.4.2.1)
- Curated sequence Q9HU31: Amino acid (Lysine/arginine/ornithine/histidine/octopine) ABC transporter periplasmic binding protein, component of Amino acid transporter, PA5152-PA5155. Probably transports numerous amino acids including lysine, arginine, histidine, D-alanine and D-valine (Johnson et al. 2008). Regulated by ArgR
- Curated sequence AO356_05495: ABC transporter for L-Lysine, periplasmic substrate-binding component
- Curated sequence AO356_09900: ABC transporter for L-Lysine, periplasmic substrate-binding component
- Curated sequence Pf6N2E2_2958: ABC transporter for L-Lysine, periplasmic substrate-binding component
- UniProt sequence Q92PA9: SubName: Full=Putative amino-acid binding periplasmic protein {ECO:0000313|EMBL:CAC46449.1};
- UniProt sequence Q88GX4: SubName: Full=Amino acid ABC transporter, periplasmic binding protein {ECO:0000313|EMBL:AAN69193.1};
- Comment: In E. coli and Salmonella, the ABC transporter has a lysine/arginine specific binding protein (argT), two permease subunits (hisQM, which are similar to each other), and an ATPase subunit (hisP). Pseudomonas aeruginosa has a homologous lysine transporter, PA5152-PA5155, as do various strains of Pseudomonas fluorescens. In P. putida, a similar system was identified using fitness data (argT = PP_3593 = Q88GX4; hisQ = PP_3594 = Q88GX3; hisM = PP_3595 = Q88GX2; hisP = PP_3597 = Q88GX0). In S. meliloti, a similar substrate-binding protein was identified using fitness data (SMc00140 = Q92PA9), but the ATPase subunit was not found (it might be shared with other systems).
Or cluster all characterized argT 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