Overview: Xylose degradation in GapMind is based on MetaCyc pathways I via D-xylulose (link), II via xylitol (link), III or V via 2-dehydro-3-deoxy-D-arabinonate (DKDP) dehydratase (link, link), IV via DKDP aldolase (link), as well as another pathway via DKDP dehydrogenase (PMC6336799).
Or see definitions of steps
Step | Description | Best candidate | 2nd candidate |
---|---|---|---|
xylT | D-xylose transporter | ||
xylA | xylose isomerase | ||
xylB | xylulokinase | ||
Alternative steps: | |||
aldA | (glycol)aldehyde dehydrogenase | ||
aldox-large | (glycol)aldehyde oxidoreductase, large subunit | ||
aldox-med | (glycol)aldehyde oxidoreductase, medium subunit | ||
aldox-small | (glycol)aldehyde oxidoreductase, small subunit | ||
araS | component of Arabinose, fructose, xylose porter | ||
araT | component of Arabinose, fructose, xylose porter | ||
araU | component of Arabinose, fructose, xylose porter | ||
araV | component of Arabinose, fructose, xylose porter | HMPREF9452_RS06235 | HMPREF9452_RS07145 |
DKDP-aldolase | 2-dehydro-3-deoxy-D-arabinonate aldolase | HMPREF9452_RS00145 | |
DKDP-dehydrog | D-2-keto-3-deoxypentoate dehydrogenase | HMPREF9452_RS08900 | HMPREF9452_RS00090 |
dopDH | 2,5-dioxopentanonate dehydrogenase | ||
Echvi_1871 | sodium/xylose cotransporter | ||
gal2 | galactose/glucose/xylose uniporter | ||
glcB | malate synthase | ||
glcP | glucose/mannose/xylose:H+ symporter | ||
gtsA | xylose ABC transporter, periplasmic substrate-binding component GtsA | ||
gtsB | xylose ABC transporter, permease component 1 GtsB | ||
gtsC | xylose ABC transporter, permease component 2 GtsC | ||
gtsD | xylose ABC transporter, ATPase component GtsD | HMPREF9452_RS08560 | HMPREF9452_RS03120 |
gyaR | glyoxylate reductase | HMPREF9452_RS05340 | HMPREF9452_RS08490 |
HDOP-hydrol | 5-hydroxy-2,4-dioxopentanonate hydrolase | ||
kdaD | 2-keto-3-deoxy-D-arabinonate dehydratase | ||
xad | D-xylonate dehydratase | HMPREF9452_RS00690 | HMPREF9452_RS05330 |
xdh | D-xylose dehydrogenase | HMPREF9452_RS00595 | HMPREF9452_RS08900 |
xdhA | xylitol dehydrogenase | HMPREF9452_RS08900 | HMPREF9452_RS03390 |
xylC | xylonolactonase | ||
xylE_Tm | ABC transporter for xylose, substrate binding component xylE | ||
xylF | ABC transporter for xylose, substrate binding component xylF | ||
xylF_Tm | ABC transporter for xylose, permease component xylF | ||
xylG | ABC transporter for xylose, ATP-binding component xylG | HMPREF9452_RS06110 | |
xylH | ABC transporter for xylose, permease component xylH | ||
xylK_Tm | ABC transporter for xylose, ATP binding component xylK | HMPREF9452_RS06110 | |
xyrA | xylitol reductase | HMPREF9452_RS03490 | HMPREF9452_RS03485 |
Confidence: high confidence medium confidence low confidence
transporter – transporters and PTS systems are shaded because predicting their specificity is particularly challenging.
This GapMind analysis is from Sep 24 2021. The underlying query database was built on Sep 17 2021.
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:
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