GapMind for catabolism of small carbon sources


Finding step mglB for lactose catabolism in Sinorhizobium meliloti 1021

4 candidates for mglB: glucose ABC transporter, substrate-binding component

Score Gene Description Similar to Id. Cov. Bits Other hit Other id. Other bits
hi SM_b20895 sugar uptake ABC transporter substrate-binding protein precursor CVE1 aka ChvE aka ATU2348 aka AGR_C_4267, component of Multiple sugar (arabinose, xylose, galactose, glucose, fucose) putative porter (characterized) 77% 100% 547.4 Probable sugar binding protein of ABC transporter for pentoses, component of ABC sugar transporter that plays a role in the probiotic benefits through acetate production 42% 259.6
hi SM_b20902 sugar uptake ABC transporter substrate-binding protein precursor glucose transporter, periplasmic substrate-binding component (characterized) 66% 100% 439.5 D-xylose ABC transporter, periplasmic D-xylose-binding protein 42% 252.3
med SMc03813 periplasmic binding ABC transporter protein LacI family transcriptional regulator, component of Glucose porter. Also bind xylose (Boucher and Noll 2011). Induced by glucose (Frock et al. 2012). Directly regulated by glucose-responsive regulator GluR (characterized) 32% 90% 150.6 RhaS, component of Rhamnose porter (Richardson et al., 2004) (Transport activity is dependent on rhamnokinase (RhaK; AAQ92412) activity (Richardson and Oresnik, 2007) This could be an example of group translocation!) 31% 88.2
lo SM_b20712 rhizopine uptake ABC transporter substrate-binding protein precursor D-galactose-binding periplasmic protein DGAL aka MglB aka B2150, component of Galactose/glucose (methyl galactoside) porter (characterized) 35% 99% 168.7 Inositol transport system sugar-binding protein 48% 270.4

Confidence: high confidence medium confidence low confidence
transporter – transporters and PTS systems are shaded because predicting their specificity is particularly challenging.

GapMind searches the predicted proteins for candidates by using ublast (a fast alternative to protein BLAST) to find similarities to characterized proteins or by using HMMer to find similarities to enzyme models (usually from TIGRFams). For alignments to characterized proteins (from ublast), scores of 44 bits correspond to an expectation value (E) of about 0.001.

Also see fitness data for the candidates

Definition of step mglB

Or cluster all characterized mglB proteins

This GapMind analysis is from Sep 17 2021. The underlying query database was built on Sep 17 2021.



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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