Definition of fumarate catabolism
As rules and steps, or see full text
Rules
Overview: Since fumarate is a TCA cycle intermediate, GapMind represent its uptake only.
- all: fumarate-transport
- fumarate-transport:
- dctA
- or sdcL
- or dauA
- or dctM, dctP and dctQ
- or SLC26dg
- or Dshi_1194 and Dshi_1195
- Comment: Transporters were identified using query: transporter:fumarate. Fumarate:succinate antiporters or fumarate:proton antiporters (probably for efflux) were not included. Subunits of succinate dehdydrogenase/fumarate reductase were also excluded.
Steps
dctA: fumarate:H+ symporter DctA
- Curated sequence CH_014038: aerobic C4-dicarboxylate transport protein. Aerobic C4-dicarboxylate transport protein. Aerobic dicarboxylate transporter, DctA. Interacts with the DcuS sensor kinase. C4 dicarboxylate/orotate:H+ symporter. C4 dicarboxylate/orotate:H+ symporter
- Curated sequence P96603: The dicarboxylate (succinate, fumarate, malate and oxaloacetate):H+ symporter, DctA (probably 3H+ are transported per succinate taken up
- Curated sequence Q01857: C4-dicarboxylate transporter (substrates: fumarate, D- and L-malate, succinate, succinamide, orotate, iticonate, mesaconate)
- Curated sequence Q1J1H5: Fumarate:H+ symporter of 442 aas and 14 established TMSs, DctA. Responsible for the transport of dicarboxylates such as succinate, fumarate, and malate
- Curated sequence Q848I3: Organic acid uptake porter, DctA of 444 aas and 8 - 10 putative TMSs
- Curated sequence AO356_18980: sodium:C4-dicarboxylate symporter (dctA)
- Curated sequence Q9I4F5: C4-dicarboxylate transport protein 2
- Total: 7 characterized proteins
sdcL: fumarate:Na+ symporter SdcL
- Curated sequence A4QAL6: The aerobic dicarboxylate (succinate (Km, 30 μM), fumarate (Km, 79
- Curated sequence Q21339: Sodium-dependent high-affinity dicarboxylate transporter 3; Na(+)/dicarboxylate cotransporter 3; NaDC-3; ceNaDC3. High affinity dicarboxylate:Na+ symporter, NaDC2 (INDY2) (relative affinities: fumarate > malate > α-ketoglutarate > maleate > succinate > lactate)
- Curated sequence Q2FFH9: The Na+ (or Li+):dicarboxylate (2:1) symporter, SdcS (catalyzes succinate:succinate antiport as well as electroneutral symport in reconstituted proteoliposomes
- Curated sequence Q65NC0: The Na+-coupled dicarboxylate (succinate; malate; fumarate) transporter, SdcL (transports aspartate, α-ketoglutarate and oxaloacetate with low affinity). Km for succinate, ~6
- Curated sequence Q9KNE0: Dicarboxylate (succinate, fumarate, malate) transporter, vcINDY
- Curated sequence Q99SX1: Sodium-dependent dicarboxylate transporter SdcS; Na(+)/dicarboxylate symporter
- Curated sequence Q93655: Sodium-dependent low-affinity dicarboxylate transporter 1; Na(+)/dicarboxylate cotransporter 1; NaDC-1; ceNaDC1. Low affinity dicarboxylate:Na+ symporter, NaDC1 (INDY1) (relative affinities: succinate > fumarate > α-ketoglutarate > malate > lactate > maleate)
- Total: 7 characterized proteins
dauA: fumarate transporter DauA
- Curated sequence P0AFR2: C4-dicarboxylic acid transporter DauA; Dicarboxylic acid uptake system A. Bicarbonate transporter, DauA (YchM). Also transports dicarboxylic acids including fumarate, aspartate and succinate, and is therefore designated the dicarboxylic acid uptake system A (DauA) (Karinou et al. 2013) It is the only succinate uptake porter at acidic pHs. The STAS domain forms a complex with the acyl carrier protein, ACP and malonyl-ACP, and the complex has been determined by x-ray crystallography (PDB# 3NY7). aerobic C4-dicarboxylate transporter DauA. aerobic C4-dicarboxylate transporter DauA
- Ignore hits to A1JRS3 when looking for 'other' hits (SulP homologue. The low resolution structure is available)
- Comment: Could not find experimental evidence for the specificity of A1JRS3, annotated in TCDB as a sulfate transporter
- Total: 1 characterized proteins
dctM: fumarate TRAP transporter, large permease component DctM
- Curated sequence O07838: C4-dicarboxylate TRAP transporter large permease protein DctM. DctM, component of Tripartite dicarboxylate:H+ symporter (substrates include: fumarate, D- and L-malate, succinate, succinamide, orotate, iticonate and mesaconate)
- Curated sequence 5208943: dicarboxylate TRAP transporter (succinate, fumarate, L-malate, and alpha-ketoglutarate), large permease component
- Curated sequence Q9HU16: C4-dicarboxylate TRAP transporter large permease protein DctM
- UniProt sequence I7DRS6: SubName: Full=TRAP transporter, subunit DctM {ECO:0000313|EMBL:AFO91751.1};
- Ignore hits to 6938090 when looking for 'other' hits (alpha-ketoglutarate TRAP transporter, large permease component)
- Comment: Three-part TRAP transporter DctMPQ In Phaeobacter inhibens, the system is important for fumarate utilization: PGA1_c20660 = dctM = I7DRS6, PGA1_c20680 = dctP = I7END8, PGA1_c20670 = dctQ = I7EY26. A closely related system in SB2B transports another dicarboxylate, 2-oxoglutarate, so its components are marked ignore
- Total: 4 characterized proteins
dctP: fumarate TRAP transporter, substrate-binding component DctP
- Curated sequence A3QCW5: C4-dicarboxylate-binding periplasmic protein DctP. dicarboxylate TRAP transporter (succinate, fumarate, L-malate, and alpha-ketoglutarate), solute receptor component
- Curated sequence P37735: C4-dicarboxylate-binding periplasmic protein DctP. DctP, component of Tripartite dicarboxylate:H+ symporter (substrates include: fumarate, D- and L-malate, succinate, succinamide, orotate, iticonate and mesaconate)
- Ignore hits to 6938088 when looking for 'other' hits (alpha-ketoglutarate TRAP transporter, solute receptor component)
- Curated sequence Q9HU18: C4-dicarboxylate-binding periplasmic protein DctP
- Curated sequence Q9KQR9: C4-dicarboxylate-binding periplasmic protein DctP
- UniProt sequence I7END8: SubName: Full=C4-dicarboxylate-binding periplasmic protein DctP {ECO:0000313|EMBL:AFO91753.1};
- Total: 5 characterized proteins
dctQ: fumarate TRAP transporter, small permease component DctQ
- Curated sequence O07837: C4-dicarboxylate TRAP transporter small permease protein DctQ. DctQ, component of Tripartite dicarboxylate:H+ symporter (substrates include: fumarate, D- and L-malate, succinate, succinamide, orotate, iticonate and mesaconate)
- Curated sequence 5208944: dicarboxylate TRAP transporter (succinate, fumarate, L-malate, and alpha-ketoglutarate), small permease component
- Ignore hits to 6938089 when looking for 'other' hits (alpha-ketoglutarate TRAP transporter, small permease component)
- UniProt sequence I7EY26: SubName: Full=TRAP transporter, subunit DctQ {ECO:0000313|EMBL:AFO91752.1};
- Total: 3 characterized proteins
SLC26dg: fumarate transporter SLC26dg
- Curated sequence Q1J2S8: Fumarate (Na+-independent anion) transporter, SLC26dg of 499 aas and 14 TMSs
- Ignore hits to O07488 when looking for 'other' hits (Sulfate permease)
- Comment: O07488 is annotated in TCDB as a sulfate permease, but I did not find any data supporting this annotation
- Total: 1 characterized proteins
Dshi_1194: TRAP transporter for succinate, fumarate, L-malate, and 2-oxoglutarate, fused 4TM/12TM components
- UniProt sequence A8LI82: SubName: Full=TRAP transporter {ECO:0000313|EMBL:ABV92936.1};
- UniProt sequence E4PQE4: SubName: Full=TRAP transporter, 4TM/12TM fusion protein {ECO:0000313|EMBL:ADP96487.1};
- Comment: The TRAP system Dshi_1194:Dshi_1195 (A8LI82,A8LI83) is important for utilization of succinate, fumarate, L-malate, and 2-oxoglutarate, as is the related system HP15_723:HP15_722 (E4PQE4,E4PQE3).
- Total: 2 characterized proteins
Dshi_1195: TRAP transporter for succinate, fumarate, L-malate, and 2-oxoglutarate, substrate-binding component
- UniProt sequence A8LI83: SubName: Full=TRAP transporter solute receptor {ECO:0000313|EMBL:ABV92937.1};
- UniProt sequence E4PQE3: SubName: Full=Immunogenic protein {ECO:0000313|EMBL:ADP96486.1};
- Total: 2 characterized proteins
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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 paper from 2022 on GapMind for carbon sources, or view the source code.
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