Summary: Sugar (and other) transporter
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Sugar (and other) transporter Provide feedback
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Internal database links
|SCOOP:||OATP PUCC Avirulence MFS_5 MFS_3 TRI12 MFS_4 MFS_1 MFS_2|
|Similarity to PfamA using HHSearch:||PTR2 OATP TRI12 MFS_1 MFS_1 ATG22 MFS_2 MFS_2|
External database links
|Transporter classification:||2.A.1 2.A.2|
This tab holds annotation information from the InterPro database.
InterPro entry IPR005828
Recent genome-sequencing data and a wealth of biochemical and molecular genetic investigations have revealed the occurrence of dozens of families of primary and secondary transporters. Two such families have been found to occur ubiquitously in all classifications of living organisms. These are the ATP-binding cassette (ABC) superfamily and the major facilitator superfamily (MFS), also called the uniporter-symporter-antiporter family. While ABC family permeases are in general multicomponent primary active transporters, capable of transporting both small molecules and macromolecules in response to ATP hydrolysis the MFS transporters are single-polypeptide secondary carriers capable only of transporting small solutes in response to chemiosmotic ion gradients. Although well over 100 families of transporters have now been recognised and classified, the ABC superfamily and MFS account for nearly half of the solute transporters encoded within the genomes of microorganisms. They are also prevalent in higher organisms. The importance of these two families of transport systems to living organisms can therefore not be overestimated [PUBMED:9529885].
The MFS was originally believed to function primarily in the uptake of sugars but subsequent studies revealed that drug efflux systems, Krebs cycle metabolites, organophosphate:phosphate exchangers, oligosaccharide:H1 symport permeases, and bacterial aromatic acid permeases were all members of the MFS. These observations led to the probability that the MFS is far more widespread in nature and far more diverse in function than had been thought previously. 17 subgroups of the MFS have been identified [PUBMED:9529885].
Evidence suggests that the MFS permeases arose by a tandem intragenic duplication event in the early prokaryotes. This event generated a 2-transmembrane-spanner (TMS) protein topology from a primordial 6-TMS unit. Surprisingly, all currently recognised MFS permeases retain the two six-TMS units within a single polypeptide chain, although in 3 of the 17 MFS families, an additional two TMSs are found [PUBMED:8987357]. Moreover, the well-conserved MFS specific motif between TMS2 and TMS3 and the related but less well conserved motif between TMS8 and TMS9 [PUBMED:1970645] prove to be a characteristic of virtually all of the more than 300 MFS proteins identified.
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||integral component of membrane (GO:0016021)|
|Molecular function||transmembrane transporter activity (GO:0022857)|
|Biological process||transmembrane transport (GO:0055085)|
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The major facilitator superfamily (MFS) is one of the two largest families of membrane transporters found on Earth . It is present ubiquitously in bacteria, archaea, and eukarya and includes members that can function by solute uniport, solute/cation symport, solute/cation antiport and/or solute/solute antiport with inwardly and/or outwardly directed polarity . All permeases of the MFS possess either 12 or 14 transmembrane helices .
The clan contains the following 24 members:Acatn ATG22 BT1 Folate_carrier FPN1 FTR1 LacY_symp MFS_1 MFS_1_like MFS_2 MFS_3 MFS_4 MFS_5 MFS_Mycoplasma Nodulin-like Nuc_H_symport Nucleoside_tran OATP PTR2 PUCC Sugar_tr TLC TRI12 UNC-93
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Curation and family details
|Seed source:||Prosite hmmls-iteration|
|Number in seed:||33|
|Number in full:||100431|
|Average length of the domain:||346.60 aa|
|Average identity of full alignment:||18 %|
|Average coverage of the sequence by the domain:||80.47 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 80369284 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||20|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Sugar_tr domain has been found. There are 14 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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