Finding step malG for D-maltose catabolism in Rhizobium freirei PRF 81
5 candidates for malG: maltose ABC transporter, permease component 2 (MalG)
| Score | Gene | Description | Similar to | Id. | Cov. | Bits | Other hit | Other id. | Other bits |
|---|
| lo | RHSP_RS09070 | carbohydrate ABC transporter permease | Maltose-transporting ATPase (EC 3.6.3.19) (characterized) | 31% | 95% | 138.7 | ABC-type transporter, integral membrane subunit, component of Trehalose porter. Also binds sucrose (Boucher and Noll, 2011). Induced by glucose and trehalose. Directly regulated by trehalose-responsive regulator TreR | 39% | 211.5 |
| lo | RHSP_RS25410 | carbohydrate ABC transporter permease | ABC-type maltose transporter (subunit 2/3) (EC 7.5.2.1) (characterized) | 31% | 98% | 137.1 | ABC-type transporter, integral membrane subunit, component of Trehalose porter. Also binds sucrose (Boucher and Noll, 2011). Induced by glucose and trehalose. Directly regulated by trehalose-responsive regulator TreR | 40% | 189.9 |
| lo | RHSP_RS28150 | carbohydrate ABC transporter permease | ABC-type maltose transporter (subunit 2/3) (EC 7.5.2.1) (characterized) | 31% | 95% | 135.6 | TogN, component of Saturated and unsaturated oligogalacturonide transporter, TogMNAB (transports di- to tetrasaccharide pectin degradation products which consist of D-galacuronate, sometimes with 4-deoxy-L-threo-5-hexosulose uronate at the reducing end of the oligosaccharide) (Hugouvieux-Cotte-Pattat et al. 2001). Regulated by pectin utilization regulator KdgR | 40% | 245.4 |
| lo | RHSP_RS13675 | carbohydrate ABC transporter permease | Maltose-transporting ATPase (EC 3.6.3.19) (characterized) | 31% | 96% | 133.7 | ABC transporter for L-Fucose, permease component 2 | 87% | 518.8 |
| lo | RHSP_RS20465 | carbohydrate ABC transporter permease | Maltose-transporting ATPase (EC 3.6.3.19) (characterized) | 31% | 100% | 131.3 | Maltose transport system permease protein malG aka TT_C1629, component of The trehalose/maltose/sucrose/palatinose porter (TTC1627-9) plus MalK1 (ABC protein, shared with 3.A.1.1.24) (Silva et al. 2005; Chevance et al., 2006). The receptor (TTC1627) binds disaccharide alpha-glycosides, namely trehalose (alpha-1,1), sucrose (alpha-1,2), maltose (alpha-1,4), palatinose (alpha-1,6) and glucose | 40% | 206.8 |
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.
Definition of step malG
- Curated sequence P68183: ABC-type maltose transporter (subunit 2/3) (EC 7.5.2.1). maltose transport system permease protein malG. Maltose/maltodextrin transport system permease protein MalG. Maltose transport system permease protein MalG aka B4032, component of Maltooligosaccharide porter. The 3-D structure has been reported by Oldham et al. (2007). An altering access mechanism has been suggested for the maltose transporter resulting from rigid-body rotations (Khare et al., 2009). Bordignon et al. (2010) and Schneider et al. (2012) have reviewed the extensive knowledge available on MalEFGK2, its mode of action and its regulatory interactions. maltose ABC transporter membrane subunit MalG (EC 7.5.2.1). maltose ABC transporter membrane subunit MalG (EC 7.5.2.1)
- Curated sequence BWI76_RS01820: Maltose-transporting ATPase (EC 3.6.3.19)
- Curated sequence GFF851: Maltose-transporting ATPase (EC 3.6.3.19)
Or cluster all characterized malG proteins
This GapMind analysis is from Sep 24 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:
- 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:
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