GapMind for Amino acid biosynthesis

 

L-arginine biosynthesis in Rhizobium johnstonii 3841

Best path

argA, argB, argC, argD, argE, carA, carB, argI, argG, argH

Rules

Overview: Arginine biosynthesis in GapMind is based on MetaCyc pathways L-arginine biosynthesis I via L-acetyl-ornithine (link), II (acetyl cycle) (link), III via N-acetyl-L-citrulline (link), or IV via LysW-ornithine (link). GapMind also includes L-arginine biosynthesis with succinylated intermediates, as in Bacteroidetes (PMC5764234). These pathways all involve the activation of glutamate (by aceylation, succinylation, or attachment of LysW), followed by phosphorylation, reduction and transamination, to activated ornithine. In most pathways, this intermediate is cleaved to ornithine before transcarbamoylation, but in the N-acetylcitrulline or succinylated pathways, transcarbamoylation occurs before hydrolysis. In the final two steps, citrulline is converted to arginine by ArgG and ArgH.

21 steps (15 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
argA N-acylglutamate synthase RL_RS22155 RL_RS02315
argB N-acylglutamate kinase RL_RS02315
argC N-acylglutamylphosphate reductase RL_RS08660
argD N-acetylornithine aminotransferase RL_RS00545 RL_RS02885
argE N-acetylornithine deacetylase RL_RS36080 RL_RS22510
carA carbamoyl phosphate synthase subunit alpha RL_RS17575
carB carbamoyl phosphate synthase subunit beta RL_RS17615
argI ornithine carbamoyltransferase RL_RS02890 RL_RS09045
argG arginosuccinate synthetase RL_RS23260 RL_RS15440
argH argininosuccinate lyase RL_RS22295
Alternative steps:
argD'B N-succinylornithine aminotransferase RL_RS02885 RL_RS22620
argE'B N-succinylcitrulline desuccinylase
argF' acetylornithine transcarbamoylase RL_RS02890
argF'B N-succinylornithine carbamoyltransferase
argJ ornithine acetyltransferase RL_RS22155
argX glutamate--LysW ligase
lysJ [LysW]-glutamate-semialdehyde aminotransferase RL_RS02885 RL_RS22620
lysK [LysW]-ornithine hydrolase
lysW 2-aminoadipate/glutamate carrier protein
lysY [LysW]-glutamate-6-phosphate reductase
lysZ [LysW]-glutamate kinase RL_RS02315

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.

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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