GapMind for Amino acid biosynthesis


L-proline biosynthesis in Herbaspirillum seropedicae SmR1

Best path

argA, argB, argC, argD, argE, cyclodeaminase

Also see fitness data for the top candidates


Overview: Proline biosynthesis in GapMind is based on MetaCyc pathways L-proline biosynthesis I from L-glutamate (link) and III via L-ornithine aminotransferase (link). GapMind also describes proline synthesis via ornithine cyclodeaminase (PMID:11489875). Pathway II from arginine (link) should perhaps be included, but is not; it is reported in nitrogen-fixing cyanobacteria and the bacteria it was reported in also have pathway I. Pathway IV is not included because it is not reported in prokaryotes (link). Also, pathway III is described in MetaCyc as occuring only in plants, but it has been reported in the archaeon Thermococcus kodakarensis (PMC5846162).

17 steps (14 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
argA N-acylglutamate synthase HSERO_RS17320 HSERO_RS01730
argB N-acylglutamate kinase HSERO_RS21495 HSERO_RS17320
argC N-acylglutamylphosphate reductase HSERO_RS19210 HSERO_RS14025
argD N-acetylornithine aminotransferase HSERO_RS05420 HSERO_RS16670
argE N-acetylornithine deacetylase HSERO_RS13940 HSERO_RS16100
cyclodeaminase ornithine cyclodeaminase HSERO_RS00300 HSERO_RS22840
Alternative steps:
argJ ornithine acetyltransferase HSERO_RS01730
argX glutamate--LysW ligase
lysJ [LysW]-glutamate-semialdehyde aminotransferase HSERO_RS05420 HSERO_RS16670
lysK [LysW]-ornithine hydrolase
lysW 2-aminoadipate/glutamate carrier protein
lysY [LysW]-glutamate-6-phosphate reductase HSERO_RS19210
lysZ [LysW]-glutamate kinase HSERO_RS21495
OAT L-ornithine 5-aminotransferase HSERO_RS19685 HSERO_RS05420
proA gamma-glutamylphosphate reductase HSERO_RS02965 HSERO_RS01815
proB glutamate 5-kinase HSERO_RS01815 HSERO_RS02965
proC pyrroline-5-carboxylate reductase HSERO_RS18990

Confidence: high confidence medium confidence low confidence
? – known gap: despite the lack of a good candidate for this step, this organism (or a related organism) performs the pathway

This GapMind analysis is from Apr 09 2024. The underlying query database was built on Apr 09 2024.



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