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A membrane transport protein is a membrane protein involved in the movement of ions, small molecules, and macromolecules, such as another protein, across a biological membrane. Transport proteins are integral transmembrane proteins; that is they exist permanently within and span the membrane across which they transport substances. The proteins may assist in the movement of substances by facilitated diffusion, active transport, osmosis, or reverse diffusion. The two main types of proteins involved in such transport are broadly categorized as either channels or carriers. Examples of channel/carrier proteins include the GLUT 1 uniporter, sodium channels, and potassium channels. The solute carriers and atypical SLCs are secondary active or facilitative transporters in humans. Collectively membrane transporters and channels are known as the transportome. Transportomes govern cellular influx and efflux of not only ions and nutrients but drugs as well.
Battenin is a protein that in humans is encoded by the CLN3 gene located on chromosome 16. Battenin is not clustered into any Pfam clan, but it is included in the TCDB suggesting that it is a transporter. In humans, it belongs to the atypical SLCs due to its structural and phylogenetic similarity to other SLC transporters.
The solute carrier (SLC) group of membrane transport proteins include over 400 members organized into 66 families. Most members of the SLC group are located in the cell membrane. The SLC gene nomenclature system was originally proposed by the HUGO Gene Nomenclature Committee (HGNC) and is the basis for the official HGNC names of the genes that encode these transporters. A more general transmembrane transporter classification can be found in TCDB database.
A neurotransmitter sodium symporter (NSS) (TC# 2.A.22) is type of neurotransmitter transporter that catalyzes the uptake of a variety of neurotransmitters, amino acids, osmolytes and related nitrogenous substances by a solute:Na+ symport mechanism. The NSS family is a member of the APC superfamily. Its constituents have been found in bacteria, archaea and eukaryotes.
The major facilitator superfamily (MFS) is a superfamily of membrane transport proteins that facilitate movement of small solutes across cell membranes in response to chemiosmotic gradients.
Major facilitator superfamily domain-containing protein 2 -- also known as sodium-dependent lysophosphatidylcholine symporter 1 -- is a protein that in humans is encoded by the MFSD2A gene. MFSD2A is a membrane transport protein that is expressed in the endothelium of the blood–brain barrier (BBB) and has an essential role in BBB formation and function. Genetic ablation of MFSD2A results in leaky BBB and increases central nervous system endothelial cell vesicular transcytosis without otherwise affecting tight junctions. MFSD2A is an atypical SLC, thus a predicted SLC transporter. It clusters phylogenetically to AMTF8.
Major facilitator superfamily domain containing 8 also called MFSD8 is a protein that in humans is encoded by the MFSD8 gene. MFSD8 is an atypical SLC, thus a predicted SLC transporter. It clusters phylogenetically to the Atypical MFS Transporter family 2 (AMTF2).
Putative sodium-coupled neutral amino acid transporter 10, also known as solute carrier family 38 member 10, is a protein that in humans is encoded by the SLC38A10 gene.
Unc-93 homolog A is a protein that in humans is encoded by the UNC93A gene.
Major facilitator superfamily domain containing 7 is a protein that in humans is encoded by the MFSD7 gene.
The amino acid-polyamine-organocation (APC) superfamily is the second largest superfamily of secondary carrier proteins currently known, and it contains several Solute carriers. Originally, the APC superfamily consisted of subfamilies under the transporter classification number. This superfamily has since been expanded to include eighteen different families.
The Amino Acid-Polyamine-Organocation (APC) Family of transport proteins includes members that function as solute:cation symporters and solute:solute antiporters. They occur in bacteria, archaea, fungi, unicellular eukaryotic protists, slime molds, plants and animals. They vary in length, being as small as 350 residues and as large as 850 residues. The smaller proteins are generally of prokaryotic origin while the larger ones are of eukaryotic origin. Most of them possess twelve transmembrane α-helical spanners but have a re-entrant loop involving TMSs 2 and 3. The APC Superfamily was established to encompass a wider range of homologues.
Major facilitator superfamily domain containing 14A is a protein that in humans is encoded by the MFSD14A gene. MFSD14A is an atypical solute carrier of MFS type. HGNC:23363
Major facilitator superfamily domain containing 1 is a protein belonging to the MFS Pfam clan. It is an Atypical solute carrier.
Major facilitator superfamily domain containing 3 (MFSD3) is a protein belonging to the MFS Pfam clan. It is an Atypical solute carrier located to the neuronal plasma membrane.
Major facilitator superfamily domain containing 5 is an atypical SLC expressed in neuronal plasma membrane. It is a plausible Solute carrier transporter. It transports molybdate anions, and it interacts with GLP-1R.
Major facilitator superfamily domain containing 11 (MFSD11) is an atypical Solute carrier found in plasma membranes.
Atypical Solute Carrier Families are novel plausible secondary active or facilitative transporter proteins that share ancestral background with the known solute carrier families (SLCs). However, they have not been assigned a name according to the SLC root system, or been classified into any of the existing SLC families.
Major facilitator superfamily domain-containing protein 9 is a protein that in humans is encoded by the MFSD9 gene. It is a potential solute carrier, and called atypical solute carrier since it is not named according to the SLC nomenclature. It is expressed both in central and peripheral organs.
Major facilitator superfamily domain containing 4A is a protein belonging to the MFS Pfam clan. It is an atypical solute carrier, thus a plausible SLC transporter in humans. MFSD4A has been identified in both central and peripheral areas.
References
- ↑ Perland, Emelie; Fredriksson, Robert (March 2017). "Classification Systems of Secondary Active Transporters". Trends in Pharmacological Sciences. 38 (3): 305–315. doi:10.1016/j.tips.2016.11.008. ISSN 1873-3735. PMID 27939446.
- ↑ Lekholm, Emilia; Perland, Emelie; Eriksson, Mikaela M.; Hellsten, Sofie V.; Lindberg, Frida A.; Rostami, Jinar; Fredriksson, Robert (2017). "Putative Membrane-Bound Transporters MFSD14A and MFSD14B Are Neuronal and Affected by Nutrient Availability". Frontiers in Molecular Neuroscience. 10: 11. doi: 10.3389/fnmol.2017.00011 . ISSN 1662-5099. PMC 5263138 . PMID 28179877.
- ↑ Perland, Emelie; Bagchi, Sonchita; Klaesson, Axel; Fredriksson, Robert (2017-09-01). "Characteristics of 29 novel atypical solute carriers of major facilitator superfamily type: evolutionary conservation, predicted structure and neuronal co-expression". Open Biology. 7 (9): 170142. doi:10.1098/rsob.170142. ISSN 2046-2441. PMC 5627054 . PMID 28878041.