GapMind for catabolism of small carbon sources


L-citrulline catabolism in Shewanella loihica PV-4

Best path

AO353_03055, AO353_03050, AO353_03045, AO353_03040, arcB, arcC, odc, puuA, puuB, puuC, puuD, gabT, gabD

Also see fitness data for the top candidates


Overview: Citrulline can be catabolized via ornithine carbamoyltransferase in reverse (PMID:3129535). Genetic evidence suggests that some bacteria use a putative citrullinase (EC to consume citrulline.

51 steps (34 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
AO353_03055 ABC transporter for L-Citrulline, periplasmic substrate-binding component Shew_3166
AO353_03050 ABC transporter for L-Citrulline, permease component 1 Shew_3165
AO353_03045 ABC transporter for L-Citrulline, permease component 2
AO353_03040 ABC transporter for L-Citrulline, ATPase component Shew_3164 Shew_2402
arcB ornithine carbamoyltransferase Shew_0204 Shew_1013
arcC carbamate kinase
odc L-ornithine decarboxylase Shew_3392
puuA glutamate-putrescine ligase Shew_0972 Shew_3554
puuB gamma-glutamylputrescine oxidase Shew_0977 Shew_0969
puuC gamma-glutamyl-gamma-aminobutyraldehyde dehydrogenase Shew_0967 Shew_3574
puuD gamma-glutamyl-gamma-aminobutyrate hydrolase Shew_0971 Shew_2532
gabT gamma-aminobutyrate transaminase Shew_3172 Shew_0966
gabD succinate semialdehyde dehydrogenase Shew_3173 Shew_0967
Alternative steps:
aruF ornithine/arginine N-succinyltransferase subunit AruAI (AruF) Shew_0579
aruG ornithine/arginine N-succinyltransferase subunit AruAII (AruG) Shew_0579
astC succinylornithine transaminase Shew_0578 Shew_1718
astD succinylglutamate semialdehyde dehydrogenase Shew_0580 Shew_0967
astE succinylglutamate desuccinylase Shew_1924
atoB acetyl-CoA C-acetyltransferase Shew_1667 Shew_0018
citrullinase putative citrullinase
davD glutarate semialdehyde dehydrogenase Shew_3173 Shew_0967
davT 5-aminovalerate aminotransferase Shew_3172 Shew_0578
ech (S)-3-hydroxybutanoyl-CoA hydro-lyase Shew_1670 Shew_0019
fadB (S)-3-hydroxybutanoyl-CoA dehydrogenase Shew_0019 Shew_2425
gcdG succinyl-CoA:glutarate CoA-transferase
gcdH glutaryl-CoA dehydrogenase Shew_0900 Shew_2570
glaH glutarate 2-hydroxylase, succinate-releasing (GlaH or CsiD)
lhgD L-2-hydroxyglutarate dehydrogenase or oxidase (LhgD or LhgO) Shew_0530
ocd ornithine cyclodeaminase
oraE D-ornithine 4,5-aminomutase, beta (E) subunit
oraS D-ornithine 4,5-aminomutase, alpha (S) subunit
ord 2,4-diaminopentanoate dehydrogenase
orr ornithine racemase
ortA 2-amino-4-oxopentanoate thiolase, alpha subunit
ortB 2-amino-4-oxopentanoate thiolase, beta subunit
patA putrescine aminotransferase (PatA/SpuC) Shew_0966 Shew_3172
patD gamma-aminobutyraldehyde dehydrogenase Shew_0967 Shew_3574
prdA D-proline reductase, prdA component
prdB D-proline reductase, prdB component
prdC D-proline reductase, electron transfer component PrdC
prdF proline racemase Shew_2363 Shew_2361
PRO3 pyrroline-5-carboxylate reductase Shew_1136 Shew_3016
PS417_17590 ABC transporter for L-Citrulline, periplasmic substrate-binding component Shew_3166
PS417_17595 ABC transporter for L-Citrulline, permease component 1 Shew_3165
PS417_17600 ABC transporter for L-Citrulline, permease component 2
PS417_17605 ABC transporter for L-Citrulline, ATPase component Shew_3164 Shew_3304
puo putrescine oxidase
put1 proline dehydrogenase Shew_0615
putA L-glutamate 5-semialdeyde dehydrogenase Shew_0615 Shew_3574
rocA 1-pyrroline-5-carboxylate dehydrogenase Shew_0615 Shew_3574
rocD ornithine aminotransferase Shew_3172 Shew_1012

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:

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