GapMind for catabolism of small carbon sources

 

L-tyrosine catabolism in Shewanella amazonensis SB2B

Best path

tyrP, HPD, hmgA, maiA, fahA, atoA, atoD, atoB

Also see fitness data for the top candidates

Rules

Overview: Tyrosine utilization in GapMind is based on MetaCyc pathway tyrosine degradation I, via homogentisate (link). This pathway requires oxygen. Another pathway via 4-hydroxyphenylacetate is known (link), but the 4-hydroxyphenylpyruvate oxidase has not been linked to sequence. The other MetaCyc pathways do not yield fixed carbon or are not reported in prokaryotes.

19 steps (11 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
tyrP Tyrosine permease Sama_2939 Sama_3479
HPD 4-hydroxyphenylpyruvate dioxygenase Sama_1568
hmgA homogentisate dioxygenase Sama_1569
maiA maleylacetoacetate isomerase Sama_2218
fahA fumarylacetoacetate hydrolase Sama_2219
atoA acetoacetyl-CoA transferase, A subunit Sama_0518 Sama_1357
atoD acetoacetyl-CoA transferase, B subunit Sama_1356 Sama_0519
atoB acetyl-CoA C-acetyltransferase Sama_1375 Sama_0031
Alternative steps:
aacS acetoacetyl-CoA synthetase Sama_1904 Sama_2897
Ac3H11_1692 L-tyrosine ABC transporter, ATPase component 2 Sama_3588 Sama_0772
Ac3H11_1693 L-tyrosine ABC transporter, ATPase component 1 Sama_3087 Sama_1969
Ac3H11_1694 L-tyrosine ABC transporter, permease component 2
Ac3H11_1695 L-tyrosine ABC transporter, permease component 1
Ac3H11_2396 L-tyrosine ABC transporter, substrate-binding component component
aroP L-tyrosine transporter (AroP/FywP)
CAT L-tyrosine transporter CAT
MCT10 L-tyrosine transporter MCT10
TAT1 L-tyrosine permease TAT1
tyt1 L-tyrosine:Na+ symporter Tyt1

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 (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 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