GapMind for catabolism of small carbon sources


Definition of D-alanine catabolism

As rules and steps, or see full text


Overview: GapMind describes D-alanine catabolism via D-alanine dehydrogenase, which forms pyruvate. This reaction is part of the MetaCyc pathway for L-alanine catabolism via D-alanine (link). In principle, D-alanine might also be catabolized via racemization to L-alanine and transamination to pyruvate, but this is not described here.


Pf6N2E2_5402: ABC transporter for D-Alanine, substrate-binding component

Pf6N2E2_5403: ABC transporter for D-Alanine, permease component 2

Pf6N2E2_5404: ABC transporter for D-Alanine, permease component 1

Pf6N2E2_5405: ABC transporter for D-Alanine, ATPase component

AZOBR_RS08235: D-alanine ABC transporter, permease component 1

AZOBR_RS08240: D-alanine ABC transporter, permease component 2

AZOBR_RS08245: D-alanine ABC transporter, ATPase component 1

AZOBR_RS08250: D-alanine ABC transporter, ATPase component 2

AZOBR_RS08260: D-alanine ABC transporter, substrate-binding component

cycA: D-alanine:H+ symporter CycA

mctP: D-alanine transporter MctP

dadA: D-alanine dehydrogenase



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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:

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 the paper from 2019 on GapMind for amino acid biosynthesis, the paper from 2022 on GapMind for carbon sources, or view the source code.

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