GapMind for catabolism of small carbon sources

 

L-tryptophan catabolism in Erythrobacter gangjinensis K7-2

Best path

aroP, tnaA

Rules

Overview: Tryptophan degradation in GapMind is based on MetaCyc degradation pathways I via anthranilate (link), II via pyruvate (link), or IX via 3-hydroxyanthranilate (link). Pathway XII (link) overlaps with pathway I and is also represented. The other MetaCyc pathways do not yield fixed carbon or are not reported in prokaryotes, and are not included. For example, pathway IV yields indole-3-lactate, which could potentially be oxidized to indole-3-acetate, which has a known catabolic pathway, but no prokaryotes are known to consume tryptophan this way. Pathway VIII yields tryptophol (also known as indole-3-ethanol), which could potentially be oxidized to indole-3-acetate and consumed. Pathways X and XIII yield indole-3-propionate, which may spontaneously oxidize to kynurate, but kynurate catabolism is not reported.

47 steps (16 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
aroP tryptophan:H+ symporter AroP
tnaA tryptophanase
Alternative steps:
ackA acetate kinase AAW01_RS06770
acs acetyl-CoA synthetase, AMP-forming AAW01_RS03860 AAW01_RS00835
adh acetaldehyde dehydrogenase (not acylating) AAW01_RS11975 AAW01_RS00220
ald-dh-CoA acetaldehyde dehydrogenase, acylating
andAa anthranilate 1,2-dioxygenase (deaminating, decarboxylating), ferredoxin--NAD(+) reductase component AndAa AAW01_RS07665
andAb anthranilate 1,2-dioxygenase (deaminating, decarboxylating), ferredoxin subunit AndAb AAW01_RS10575
andAc anthranilate 1,2-dioxygenase (deaminating, decarboxylating), large subunit AndAc
andAd athranilate 1,2-dioxygenase (deaminating, decarboxylating), small subunit AndAd
antA anthranilate 1,2-dioxygenase (deaminating, decarboxylating), large subunit AntA
antB anthranilate 1,2-dioxygenase (deaminating, decarboxylating), small subunit AntB
antC anthranilate 1,2-dioxygenase (deaminating, decarboxylating), electron transfer component AntC
catA catechol 1,2-dioxygenase
catB muconate cycloisomerase
catC muconolactone isomerase
catI 3-oxoadipate CoA-transferase subunit A (CatI)
catJ 3-oxoadipate CoA-transferase subunit B (CatJ)
ecfA1 energy-coupling factor transporter, ATPase 1 (A1) component AAW01_RS11150 AAW01_RS07155
ecfA2 energy-coupling factor transporter, ATPase 2 (A2) component AAW01_RS01810 AAW01_RS07155
ecfT energy-coupling factor transporter, transmembrane (T) component
hpaH anthranilate 3-monooxygenase (hydroxylase), FADH2-dependent
kyn kynureninase AAW01_RS09270
kynA tryptophan 2,3-dioxygenase AAW01_RS09265
kynB kynurenine formamidase AAW01_RS11730 AAW01_RS11545
mhpD 2-hydroxypentadienoate hydratase
mhpE 4-hydroxy-2-oxovalerate aldolase
nbaC 3-hydroxyanthranilate 3,4-dioxygenase
nbaD 2-amino-3-carboxymuconate-6-semialdehyde decarboxylase
nbaE 2-aminomuconate 6-semialdehyde dehydrogenase AAW01_RS09770 AAW01_RS04300
nbaF 2-aminomuconate deaminase
nbaG 2-oxo-3-hexenedioate decarboxylase
pcaD 3-oxoadipate enol-lactone hydrolase
pcaF succinyl-CoA:acetyl-CoA C-succinyltransferase AAW01_RS00830 AAW01_RS02970
pcaI 3-oxoadipate CoA-transferase subunit A (PcaI) AAW01_RS09475
pcaJ 3-oxoadipate CoA-transferase subunit B (PcaJ) AAW01_RS09460
praB 2-hydroxymuconate 6-semialdehyde dehydrogenase AAW01_RS09770 AAW01_RS04300
praC 2-hydroxymuconate tautomerase
praD 2-oxohex-3-enedioate decarboxylase
pta phosphate acetyltransferase AAW01_RS09310
sibC L-kynurenine 3-monooxygenase
TAT tryptophan permease
tnaB tryptophan:H+ symporter TnaB
tnaT tryptophan:Na+ symporter TnaT
trpP energy-coupling factor transporter, tryptophan-specific (S) component TrpP
xylE catechol 2,3-dioxygenase
xylF 2-hydroxymuconate semialdehyde hydrolase

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 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:

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