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Sodium:dicarboxylate symporter

Protein family

Summary

Protein family

Field	Value
Symbol	SDF
Name	SDF
image	PDB 2nwx EBI.jpg
caption	crystal structure of gltph in complex with l-aspartate and sodium ions
Pfam	PF00375
InterPro	IPR001991
PROSITE	PDOC00591
TCDB	2.A.23
OPM family	20
OPM protein	2nwl

It has been shown that integral membrane proteins that mediate the uptake of a wide variety of molecules with the concomitant uptake of sodium ions (sodium symporters) can be grouped, on the basis of sequence and functional similarities into a number of distinct families. One of these families is known as the sodium:dicarboxylate symporter family (SDF) (it is different from divalent anion–sodium symporter).

Such re-uptake of neurotransmitters from the synapses, is thought to be an important mechanism for terminating their action, by removing these chemicals from the synaptic cleft, and transporting them into presynaptic nerve terminals, and surrounding neuroglia. this removal is also believed to prevent them accumulating to the point of reaching neurotoxic.

The structure of these transporter proteins has been variously reported to contain from 8 to 10 transmembrane (TM) regions, although 10 now seems to be the accepted value.

Members of the family include: several mammalian excitatory amino acid transporters, and a number of bacterial transporters. They vary with regards to their dependence on transport of sodium, and other ions.

References

(June 1994). "A functional superfamily of sodium/solute symporters". Biochim. Biophys. Acta.
(November 1992). "Structure, expression, and functional analysis of a Na(+)-dependent glutamate/aspartate transporter from rat brain". Proc. Natl. Acad. Sci. U.S.A..
(December 1992). "Cloning and expression of a rat brain L-glutamate transporter". Nature.
(December 1992). "Primary structure and functional characterization of a high-affinity glutamate transporter". Nature.

Wikipedia Source

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