GapMind for catabolism of small carbon sources


putrescine catabolism in Pseudomonas fluorescens FW300-N2E3

Best path

potA, potB, potC, potD, puuA, puuB, puuC, puuD, gabT, gabD

Also see fitness data for the top candidates


Overview: Putrescine degradation in GapMind is based on MetaCyc pathways putrescine degradation I via putrescine aminotransferase (link), pathway II with glutamylated intermediates (link), pathway IV via putrescine oxidase (link), or pathway V via putrescine:pyruvate aminotransferase (link). Pathway III is not reported in prokaryotes, so it is not included in GapMind.

18 steps (13 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
potA putrescine ABC transporter, ATPase component (PotA/PotG) AO353_08570 AO353_29310
potB putrescine ABC transporter, permease component 1 (PotB/PotH) AO353_29315 AO353_08565
potC putrescine ABC transporter, permease component 2 (PotC/PotI) AO353_08560 AO353_29320
potD putrescine ABC transporter, substrate-binding component (PotD/PotF) AO353_08580 AO353_09980
puuA glutamate-putrescine ligase AO353_08595 AO353_29300
puuB gamma-glutamylputrescine oxidase AO353_20720 AO353_29290
puuC gamma-glutamyl-gamma-aminobutyraldehyde dehydrogenase AO353_09195 AO353_29295
puuD gamma-glutamyl-gamma-aminobutyrate hydrolase AO353_29305
gabT gamma-aminobutyrate transaminase AO353_08585 AO353_15040
gabD succinate semialdehyde dehydrogenase AO353_11505 AO353_28230
Alternative steps:
patA putrescine aminotransferase (PatA/SpuC) AO353_08585 AO353_15040
patD gamma-aminobutyraldehyde dehydrogenase AO353_04290 AO353_04265
POT1 putrescine:H+ symporter POT1
potE putrescine:H+ symporter PotE
puo putrescine oxidase
puuP putrescine:H+ symporter PuuP/PlaP AO353_27910
TPO1 putrescine transporter TPO1
UGA4 putrescine transporter UGA4

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.



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