GapMind for catabolism of small carbon sources

 

Finding step aapM for L-histidine catabolism in Halomonas xinjiangensis TRM 0175

3 candidates for aapM: L-histidine ABC transporter, permease component 2 (AapM)

Score Gene Description Similar to Id. Cov. Bits Other hit Other id. Other bits
med JH15_RS12960 amino acid ABC transporter permease ABC transporter for L-Glutamine, L-Histidine, and other L-amino acids, permease component 2 (characterized) 55% 97% 402.5 ABC transporter for D-Alanine, permease component 1 65% 481.1
lo JH15_RS13615 amino acid ABC transporter permease AapM, component of General L-amino acid porter; transports basic and acidic amino acids preferentially, but also transports aliphatic amino acids (catalyzes both uptake and efflux) (characterized) 32% 54% 109 Glutamine transport system permease protein GlnP aka B0810, component of Three component ABC L-glutamine porter. The basal ATPase activity (ATP hydrolysis in the absence of substrate) is mainly caused by the docking of the closed-unliganded state of GlnH onto the transporter domain of GlnPQ. Unlike glutamine, arginine binds both GlnH domains, but does not trigger their closing. Comparison of the ATPase activity in nanodiscs with glutamine transport in proteoliposomes suggested that the stoichiometry of ATP per substrate is close to two 54% 208.8
lo JH15_RS15195 amino acid ABC transporter permease ABC transporter for L-Glutamine, L-Histidine, and other L-amino acids, permease component 2 (characterized) 32% 56% 104.8 OCM1 aka OccM, component of Octopine porter 45% 158.7

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 aapM

Or cluster all characterized aapM proteins

This GapMind analysis is from Sep 24 2021. The underlying query database was built on Sep 17 2021.

Links

Downloads

Related tools

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:

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:

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:

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