GapMind for Amino acid biosynthesis

 

L-histidine biosynthesis in Nostoc punctiforme ATCC 29133; PCC 73102

Best path

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

Rules

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 NPUN_RS11925
hisG ATP phosphoribosyltransferase NPUN_RS32320
hisI phosphoribosyl-ATP pyrophosphatase NPUN_RS20680 NPUN_RS25190
hisE phosphoribosyl-AMP cyclohydrolase NPUN_RS20680 NPUN_RS25190
hisA 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino]imidazole-4-carboxamide isomerase NPUN_RS00270 NPUN_RS22235
hisF imidazole glycerol phosphate synthase, cyclase subunit NPUN_RS22235 NPUN_RS00270
hisH imidazole glycerol phosphate synthase, amidotransferase subunit NPUN_RS25235 NPUN_RS22235
hisB imidazoleglycerol-phosphate dehydratase NPUN_RS27880
hisC histidinol-phosphate aminotransferase NPUN_RS03830 NPUN_RS04575
hisN histidinol-phosphate phosphatase NPUN_RS22840 NPUN_RS27880
hisD histidinal/histidinol dehydrogenase NPUN_RS25190

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