GapMind for catabolism of small carbon sources

 

D-alanine catabolism in Sinorhizobium meliloti 1021

Best path

AZOBR_RS08235, AZOBR_RS08240, AZOBR_RS08245, AZOBR_RS08250, AZOBR_RS08260, dadA

Also see fitness data for the top candidates

Rules

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.

12 steps (10 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
AZOBR_RS08235 D-alanine ABC transporter, permease component 1 SMc01951 SMc02359
AZOBR_RS08240 D-alanine ABC transporter, permease component 2 SMc01950
AZOBR_RS08245 D-alanine ABC transporter, ATPase component 1 SMc01949 SMc02357
AZOBR_RS08250 D-alanine ABC transporter, ATPase component 2 SMc01948 SMc02358
AZOBR_RS08260 D-alanine ABC transporter, substrate-binding component SMa0576 SMc01946
dadA D-alanine dehydrogenase SM_b20267
Alternative steps:
cycA D-alanine:H+ symporter CycA
mctP D-alanine transporter MctP
Pf6N2E2_5402 ABC transporter for D-Alanine, substrate-binding component SMc02118 SMc00676
Pf6N2E2_5403 ABC transporter for D-Alanine, permease component 2 SMc02119 SM_b21095
Pf6N2E2_5404 ABC transporter for D-Alanine, permease component 1 SMc02120 SMa0081
Pf6N2E2_5405 ABC transporter for D-Alanine, ATPase component SMc03135 SMc02121

Confidence: high confidence medium confidence low confidence
transporter – transporters and PTS systems are shaded because predicting their specificity is particularly challenging.

This GapMind analysis is from Sep 17 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 against a database of manually-curated proteins (most of which are experimentally characterized) or by using HMMer. 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. 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 preprint 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