GapMind for Amino acid biosynthesis


L-histidine biosynthesis in Herbaspirillum autotrophicum IAM 14942

Best path

prs, hisG, hisI, hisE, hisA, hisF, hisH, hisB, hisC, hisN, hisD


Overview: Histidine biosynthesis in GapMind is based on the MetaCyc pathway (link).

11 steps (11 with candidates)

Or see definitions of steps

Step Description Best candidate 2nd candidate
prs ribose-phosphate diphosphokinase AKL27_RS10650
hisG ATP phosphoribosyltransferase AKL27_RS17900
hisI phosphoribosyl-ATP pyrophosphatase AKL27_RS17945 AKL27_RS17905
hisE phosphoribosyl-AMP cyclohydrolase AKL27_RS17940 AKL27_RS17905
hisA 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino]imidazole-4-carboxamide isomerase AKL27_RS17930 AKL27_RS17935
hisF imidazole glycerol phosphate synthase, cyclase subunit AKL27_RS17935 AKL27_RS17930
hisH imidazole glycerol phosphate synthase, amidotransferase subunit AKL27_RS17925
hisB imidazoleglycerol-phosphate dehydratase AKL27_RS17920
hisC histidinol-phosphate aminotransferase AKL27_RS20590 AKL27_RS16305
hisN histidinol-phosphate phosphatase AKL27_RS05545 AKL27_RS25890
hisD histidinal/histidinol dehydrogenase AKL27_RS17905 AKL27_RS19280

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