Amino acid biosynthesis in Ignavibacteria bacterium SSF34

GapMind for Amino acid biosynthesis

Amino acid biosynthesis in Ignavibacteria bacterium SSF34

Pathways are sorted by name. Sort by completeness instead.

Pathway	Steps
arg	argJ, argB, argC, argD, carA, carB *, argI, argG, argH
asn	aspS2, gatA, gatB, gatC
chorismate	aroG, aroB, aroD, aroE, aroL, aroA, aroC
cys	CBS, CGL
gln	gltX, glnA, gatA, gatB, gatC
gly	glyA
his	prs, hisG, hisI, hisE, hisA, hisF, hisH, hisB, hisC, hisN, hisD
ile	prpE, ofoa, ofob, ilvI, ilvH, ilvC, ilvD, ilvE
leu	ilvI, ilvH, ilvC, ilvD, leuA, leuC, leuD, leuB, ilvE
lys	asp-kinase, asd, dapA, dapB, DAPtransferase, dapF, lysA
met	asp-kinase, asd, hom, metX, metY, metH *, B12-reactivation-domain
phe	cmutase, preph-dehydratase, PPYAT
pro	proB, proA, proC
ser	serA, serC, serB
thr	asp-kinase, asd, hom, thrB, thrC
trp	trpED, trpD_2, PRAI, IGPS, trpA, trpB
tyr	PAH
val	ilvI, ilvH, ilvC, ilvD, ilvE

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

Dependencies

cys (using rule from-serine-homocysteine) also requires met:homocysteine, which is not high-confidence.
- Cysteine biosynthesis via the reverse transsulfuration pathway requires homocysteine, which is an intermediate in methionine biosynthesis. Homocysteine is also an intermediate in the S-adenosylmethionine cycle, so many organisms that cannot synthesize methionine can convert it to homocysteine.

This GapMind analysis is from Nov 24 2024. The underlying query database was built on Jul 25 2024.

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Candidates (tab-delimited)
Steps (tab-delimited)
Rules (tab-delimited)
Protein sequences (fasta format)
Organisms (tab-delimited)
SQLite3 databases

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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:

ublast finds a hit to a characterized protein at above 40% identity and 80% coverage, and bits >= other bits+10.
- (Hits to curated proteins without experimental data as to their function are never considered high confidence.)
HMMer finds a hit with 80% coverage of the model, and either other identity < 40 or other coverage < 0.75.

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:

ublast finds a hit at above 40% identity and 70% coverage (ignoring otherBits).
ublast finds a hit at above 30% identity and 80% coverage, and bits >= other bits.
HMMer finds a hit (regardless of coverage or other bits).

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:

our ignorance of proteins' functions,
omissions in the gene models,
frame-shift errors in the genome sequence, or
the organism lacks the pathway.

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:

the paper from 2019 on GapMind for amino acid biosynthesis
the 2024 update on GapMind for amino acid biosynthesis
the paper from 2022 on GapMind for carbon sources
the source code
instructions for running GapMind on your computer
changes to Amino acid biosynthesis since the original publication.

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

GapMind for Amino acid biosynthesis